Details of the Researcher

PHOTO

Yuichiro Kawabata
Section
Green Goals Initiative
Job title
Specially Appointed Professor(Research)

Research Areas 2

  • Aerospace, marine, and maritime Engineering / Marine and maritime engineering / deep sea infrastructure

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (materials, implementation, construction management) /

Awards 17

  1. Technology award

    2023/06 Japan Concrete Institute

  2. Yoshida Prize (Best Research Paper)

    2022/06 Japan Society for Civil Engineers

  3. The Young Scientists’ Prize

    2019/04 The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

  4. 論文賞

    2018/05 (一社)セメント協会

  5. 優秀論文賞

    2017/10 (公社)日本材料学会

  6. 論文賞

    2016/06 (公社)日本コンクリート工学協会

  7. 論文賞

    2016/05 (一社)セメント協会

  8. Best three papers of the year 2015

    2015/12 Journal of Advanced Concrete Technology

  9. 論文賞

    2015/06 (公社)土木学会

  10. 吉田賞(論文部門)

    2014/06 (公社)土木学会

  11. Best three papers of the year 2012

    2012/12 Journal of Advanced Concrete Technology

  12. 論文講演賞

    2010/11 (社)土木学会

  13. 吉田研究奨励賞

    2010/05 (社)土木学会

  14. 研究奨励賞

    2009/05 (社)土木学会

  15. 吉田賞(論文部門)

    2008/05 (社)土木学会

  16. 年次論文奨励賞

    2007/07 (社)日本コンクリート工学協会

  17. 年次論文奨励賞

    2005/06 (社)日本コンクリート工学協会

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Papers 102

  1. Durability of cementitious binders with blast furnace slag in deep sea conditions: Analysis of microstructure and phase transformation

    Keisuke Takahashi, Yuichiro Kawabata, Mari Kobayashi, Takafumi Kasaya, Shintaro Miyamoto, Hong S. Wong

    Cement and Concrete Research 196 107942-107942 2025/10

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconres.2025.107942  

    ISSN: 0008-8846

  2. New insights on thaumasite precipitation based on thermodynamic modeling and 3-year exposure of cement pastes to Na2SO4 and MgSO4 solutions

    Shintaro Miyamoto, Yuichiro Kawabata, Natsuki Yoshida, Marcus H.N. Yio, Tsuyoshi Saito, Hong S. Wong

    Cement and Concrete Composites 163 106190-106190 2025/10

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2025.106190  

    ISSN: 0958-9465

  3. Applicability of Concrete Containing High-Volume Mineral Admixtures to Non-Reinforced Concrete Block in Port and Calculation of Avoided CO<sub>2</sub> Emissions

    Yuichiro KAWABATA, Sumire NAKAMURA, Toru YAMAJI

    Journal of the Society of Materials Science, Japan 74 (5) 288-293 2025/05/15

    Publisher: Society of Materials Science, Japan

    DOI: 10.2472/jsms.74.288  

    ISSN: 0514-5163

    eISSN: 1880-7488

  4. Anisotropy mechanism of alkali-silica reaction at the material scale: From expansion behavior to mechanical property degradation

    Misato Fujishima, Taito Miura, Stéphane Multon, Yuichiro Kawabata

    Cement and Concrete Composites 159 106008-106008 2025/05

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2025.106008  

    ISSN: 0958-9465

  5. Mechanical behavior of concrete under high water pressure: Water penetration as a critical factor for mechanical properties

    Atichon Kunawisarut, Yuichiro Kawabata, Mitsuyasu Iwanami

    Cement and Concrete Research 190 107820-107820 2025/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconres.2025.107820  

    ISSN: 0008-8846

  6. Decision-making in structural type selection at the early design stage in terms of carbon emissions and cost – Insights from case studies of port mooring facilities

    Sumire Nakamura, Yuichiro Kawabata, Mana Yamashita, Mitsuyasu Iwanami

    Journal of Cleaner Production 498 145072-145072 2025/03

    Publisher: Elsevier BV

    DOI: 10.1016/j.jclepro.2025.145072  

    ISSN: 0959-6526

  7. APPLICABILITY OF CONCRETE CONTAINING HIGH-VOLUME MINERAL ADMIXTURES TO NON-REINFORCED PORT CONCRETE MEMBERS

    Yuichiro KAWABATA, Sumire NAKAMURA, Toru YAMAJI

    Japanese Journal of JSCE 81 (18) n/a-n/a 2025

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejj.25-18021  

    eISSN: 2436-6021

  8. Development of Mesoscale Model for Volumetric Deformation of Cementitious Materials in Deep-Sea Environment

    Taito Miura, Ryosuke Hatta, Ryuta Amatsubo, Yuchiro Kawabata, Keisuke Takahashi

    Proceedings of the Eighth International Conference on Durability of Concrete Structures 2025

    Publisher: Purdue University

    DOI: 10.5703/1288284318116  

  9. Utilisation of Semi-naturally Carbonated Steelmaking Slag as Concrete Aggregate

    Sumire Nakamura, Yuichiro Kawabata

    Proceedings of the Eighth International Conference on Durability of Concrete Structures 2025

    Publisher: Purdue University

    DOI: 10.5703/1288284318172  

  10. Mechanical Behaviour of Cement-based Materials in Deep Seas: A Review

    Yuichiro Kawabata, Keisuke Takahashi, Hong Wong

    Proceedings of the Eighth International Conference on Durability of Concrete Structures 2025

    Publisher: Purdue University

    DOI: 10.5703/1288284318146  

  11. Durability of Cement-based Materials in Deep Seas: A Review of Chemical Aspects with New Results Peer-reviewed

    Keisuke Takahashi, Yuichiro Kawabata, Hong Wong

    Proceedings of the Eighth International Conference on Durability of Concrete Structures 2025

    Publisher: Purdue University

    DOI: 10.5703/1288284318120  

  12. Required research for predicting AAR expansion: the Ichikawa theory revisited Peer-reviewed

    Kazuo Yamada, Yuichiro Kawabata, Kannosuke Shiraishi

    Magazine of Concrete Research 77 (15-16) 903-918 2025

    DOI: 10.1680/jmacr.25.00048  

  13. Integration of Green and Gray Infrastructures – Conceptualization from the Perspective of Gray Engineers Peer-reviewed

    Yuichiro Kawabata, Kazushi Takimoto, Takaaki Nishida, Yoshinori Koshikawa, Akihito Aizawa

    Structural Engineering International 1-9 2024/09/19

    Publisher: Informa UK Limited

    DOI: 10.1080/10168664.2024.2398791  

    ISSN: 1016-8664

    eISSN: 1683-0350

  14. Quantitative assessment of correlation between compressive strength degradation and microstructural crack information in mortar deteriorated by freeze-thaw cycles Peer-reviewed

    Xi Ji, Yuya Takahashi, Yuichiro Kawabata

    Construction and Building Materials 445 137828-137828 2024/09

    Publisher: Elsevier BV

    DOI: 10.1016/j.conbuildmat.2024.137828  

    ISSN: 0950-0618

  15. Anisotropic expansion behavior and crack orientation of reinforced concrete due to the alkali–silica reaction

    Sara Farooq, Gentaro Aoki, Taito Miura, Yuichiro Kawabata, Hikaru Nakamura

    Cement and Concrete Composites 151 105568-105568 2024/08

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2024.105568  

    ISSN: 0958-9465

  16. A multi-scale experimental investigation of the feasibility of using integrated coal gasification combined slag as a supplementary cementitious material

    Yuqian Zheng, Satya Medepalli, Tiao Wang, Tetsuya Ishida, Yuichiro Kawabata, Seishi Goto, Yao Luan

    Journal of Cleaner Production 449 141491-141491 2024/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.jclepro.2024.141491  

    ISSN: 0959-6526

  17. DESIGN OF REINFORCEMENT METHOD OF RC CAISSON WALL BY SOLIDIFICATION OF FILLING MATERIALS

    Yutaka TANAKA, Yuichiro KAWABATA, Ema KATO, Yousuke OHYA

    Japanese Journal of JSCE 80 (3) n/a-n/a 2024

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejj.22-00293  

    eISSN: 2436-6021

  18. 環境性と経済性の観点からの消波ブロック被覆堤の最適断面に関する検討

    Sumire NAKAMURA, Yuichiro KAWABATA, Mitsuyasu IWANAMI

    Japanese Journal of JSCE 80 (5) n/a-n/a 2024

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejj.24-00024  

    eISSN: 2436-6021

  19. Physicochemical Properties of Portland Cement/Calcium Aluminate Cement/Calcium Sulfate Ternary Binder Exposed to Deep Seafloor

    Mari Kobayashi, Keisuke Takahashi, Yuichiro Kawabata, Thomas A. Bier

    ce/papers 6 (6) 1305-1308 2023/12/06

    Publisher: Wiley

    DOI: 10.1002/cepa.2920  

    ISSN: 2509-7075

    eISSN: 2509-7075

    More details Close

    Abstract Cementitious materials employed in deep‐sea marine engineering must have excellent durability. In this study, the durability of a ternary binder‐based paste composed of Portland cement, calcium aluminate cement, and anhydrite was investigated after deep‐sea exposure at a depth of 3515 m for 438 days. The recovered paste specimen showed significant expansion. However, the hydrate phases in the ternary binder exhibited no changes with the exception of the formation of Friedel's and Kuzel's salts. One reason for this was the transformation from unstable monosulfate to stable ettringite under low‐temperature seawater conditions. However, the additional ettringite formation could lead to significant expansion of the paste specimen.

  20. Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part II: Bond Performance of Reinforced Concrete Affected by DEF Expansion

    Taito Miura, Misato Fujishima, Yuichiro Kawabata, Stéphane Multon, Renaud-Pierre Martin, Naoshi Ueda, Yuya Takahashi, Shingo Asamoto, Jean-Francois Seignol

    Journal of Advanced Concrete Technology 21 (11) 869-888 2023/11/18

    Publisher: Japan Concrete Institute

    DOI: 10.3151/jact.21.869  

    ISSN: 1346-8014

    eISSN: 1347-3913

  21. Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete

    Yuichiro Kawabata, Taito Miura, Misato Fujishima, Naoshi Ueda, Yuya Takahashi, Shingo Asamoto, Stéphane Multon, Renaud-Pierre Martin, Jean-Francois Seignol

    Journal of Advanced Concrete Technology 21 (11) 851-868 2023/11/09

    Publisher: Japan Concrete Institute

    DOI: 10.3151/jact.21.851  

    ISSN: 1346-8014

    eISSN: 1347-3913

  22. Influence of the expansive sites distribution on alkali-silica reaction expansion under applied stress: Crack orientation as a key factor for expansion transfer Peer-reviewed

    Taito Miura, Stéphane Multon, Yuichiro Kawabata

    Cement and Concrete Composites 2023/11

    DOI: 10.1016/j.cemconcomp.2023.105300  

  23. A Review of Numerical Models for the Performance Assessment of Concrete Structures Affected by Alkali-Silica Reaction

    Yuya Takahashi, Taito Miura, Naoshi Ueda, Yoshihiko Toda, Go Igarashi, Stéphane Multon, Yuichiro Kawabata

    Journal of Advanced Concrete Technology 21 (8) 655-679 2023/08/25

    Publisher: Japan Concrete Institute

    DOI: 10.3151/jact.21.655  

    ISSN: 1346-8014

    eISSN: 1347-3913

  24. Deterioration of Cement-Based Materials in Low-Temperature Seawater Peer-reviewed

    Mari Kobayashi, Keisuke Takahashi, Yuichiro Kawabata

    Materials 16 (15) 5278 2023/07/27

    DOI: 10.3390/ma16155278  

  25. Stress-bearing Mechanism of Concrete Damaged by Delayed Ettringite Formation under Compressive Stress with Various Loading Patterns Peer-reviewed

    Misato Fujishima, Taito Miura, Yuichiro Kawabata

    Journal of Advanced Concrete Technology 21 (4) 294-306 2023/04/19

    Publisher: Japan Concrete Institute

    DOI: 10.3151/jact.21.294  

    ISSN: 1346-8014

    eISSN: 1347-3913

  26. PILOT STUDY ON THE INFLUENCE OF HIGH ALKALI CONTENT COAL GASIFICATION SLAG FINE AGGREGATE ON ALKALI SILICA REACTION Peer-reviewed

    Go IGARASHI, Yuichiro KAWABATA, Tadataka MATSUURA, Tetsuya ISHIDA

    Cement Science and Concrete Technology 76 (1) 238-244 2023/03/31

    Publisher: Japan Cement Association

    DOI: 10.14250/cement.76.238  

    ISSN: 0916-3182

    eISSN: 2187-3313

  27. Utilization of cement-based materials for deep sea infrastructure

    Keisuke Takahashi, Mari Kobayashi, Yuichiro Kawabata, Takafumi Kasaya, Mitsuyasu Iwanami, Toshiro Yamanaka, Shun Nomura, Hiroko Makita

    2023 IEEE Underwater Technology (UT) 2023/03/06

    Publisher: IEEE

    DOI: 10.1109/ut49729.2023.10103374  

  28. Environmental impacts on expansion of concrete due to alkali–silica reaction Peer-reviewed

    Yuichiro Kawabata, Kazuo Yamada, Takashi Kawakami, Yasutaka Sagawa

    Magazine of Concrete Research 1-11 2022/09/16

    Publisher: Thomas Telford Ltd.

    DOI: 10.1680/jmacr.22.00158  

    ISSN: 0024-9831

    eISSN: 1751-763X

    More details Close

    Environmental conditions critically affect the expansion behaviour of concrete due to alkali–silica reaction (ASR) and, therefore, must be modelled to predict ASR-induced expansion behaviour. In addition, laboratory tests are important for the provision of useful data for numerical models, since these models often require the calibration of some unknown parameters according to the materials tested. To address this, the authors have developed a testing method for concrete expansion, called the alkali-wrapped concrete prism test (AW-CPT). Predictions using the results of the AW-CPT would be beneficial for the assessment of potential expansion of concrete when exposed to the outdoor environment. In this study, the effects of environmental conditions on ASR-induced expansion behaviours are determined through exposure and laboratory tests. The environmental conditions are modelled and implemented in numerical simulations. The results indicate that solar insolation and rainfall are critical parameters for modelling the environmental conditions as well as ambient temperature and relative humidity.

  29. Physicochemical properties of Portland cement/calcium aluminate cement/calcium sulfate ternary binder exposed to long-term deep-sea conditions Peer-reviewed

    Mari Kobayashi, Keisuke Takahashi, Yuichiro Kawabata, Thomas A. Bier

    Materials and Structures 55 (7) 2022/09

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1617/s11527-022-02021-8  

    ISSN: 1359-5997

    eISSN: 1871-6873

  30. Combined effect of rice husk ash and superabsorbent polymer on self-healing capability of mortar Peer-reviewed

    Pattharaphon Chindasiriphan, Hiroshi Yokota, Yuichiro Kawabata, Paponpat Pimpakan

    Construction and Building Materials 338 2022/07/04

    DOI: 10.1016/j.conbuildmat.2022.127588  

    ISSN: 0950-0618

  31. Effects of temperature on expansion of concrete due to the alkali-silica reaction: A simplified numerical approach Peer-reviewed

    Y. Kawabata, C. Dunant, S. Nakamura, K. Yamada, T. Kawakami

    Materiales de Construcción 72 (346) e282-e282 2022/04/26

    Publisher: Editorial CSIC

    DOI: 10.3989/mc.2022.17121  

    ISSN: 0465-2746

    eISSN: 1988-3226

    More details Close

    The effects of temperature on the expansion behavior of concrete due to the alkali-silica reaction (ASR) were assessed through a simplified numerical analysis. Numerical models were constructed based on findings from a literature review. A simplified damage model was implemented to capture interactions between the viscoelasticity of the ASR gel and microstructural damage of the aggregate and paste. The parameters of the damage model were identified by fitting the simulated results to the experimental data. The results indicate that for a given reaction ratio, expansion ability is reduced at higher temperatures during the early and late stages of expansion. The results demonstrate that explicit modeling of chemo-mechanical interactions is important to achieve accurate numerical predictions of expansion behavior.

  32. Investigation of the mechanical behaviour of concrete with severe delayed ettringite formation expansion focusing on internal damage propagation under various compressive loading patterns Peer-reviewed

    Nirmal Raj Joshi, Ayumu Matsumoto, Shingo Asamoto, Taito Miura, Yuichiro Kawabata

    Cement and Concrete Composites 128 104433-104433 2022/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2022.104433  

    ISSN: 0958-9465

  33. Mechanism for reduction in compressive properties of cementitious materials in relation to internal crack patterns due to ASR and DEF expansion Peer-reviewed

    Taito Miura, Katsuki Sato, Misato Fujishima, Hikaru Nakamura, Yuichiro Kawabata

    Cement and Concrete Composites 128 104441-104441 2022/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2022.104441  

    ISSN: 0958-9465

  34. In-Situ Deep-Sea Monitoring of Cement Mortar Specimen at a Depth of 3515 m and Changes in Mechanical Properties after Exposure to Deep Sea Condition Peer-reviewed

    Keisuke Takahashi, Yuichiro Kawabata, Mitsuyasu Iwanami, Mari Kobayashi, Takafumi Kasaya, Toshiro Yamanaka, Shun Nomura, Hiroko Makita

    Journal of Advanced Concrete Technology 20 (3) 254-266 2022/03/29

    DOI: 10.3151/jact.20.254  

    ISSN: 1346-8014

    eISSN: 1347-3913

  35. In situ observation for the influence of hydraulic pressure on internal damage of cement-based materials Peer-reviewed

    Yuichiro Kawabata, Daiki Takano, Keisuke Takahashi, Mitsuyasu Iwanami

    Materials & Design 216 110556-110556 2022/03

    Publisher: Elsevier BV

    DOI: 10.1016/j.matdes.2022.110556  

    ISSN: 0264-1275

  36. CO2 EMISSIONS IN THE CONSTRUCTION OF CAISSON-TYPE BREAKWATERS: FORMULATING AN EMISSION ESTIMATION METHOD Peer-reviewed

    Sumire NAKAMURA, Yuichiro KAWABATA, Daisuke TATSUMI

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 78 (2) I_307-I_312 2022

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejoe.78.2_i_307  

    eISSN: 2185-4688

  37. COMPARATIVE STUDY OF CO2 EMISSIONS FOR PRECAST PORT PIER CONSTRUCTION METHODS Peer-reviewed

    Katsuya IKENO, Sumire NAKAMURA, Yuichiro KAWABATA, Shunsuke KANAEDA, Mitsuyasu IWANAMI

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 78 (2) I_301-I_306 2022

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejoe.78.2_i_301  

    eISSN: 2185-4688

  38. Recommendation of RILEM TC 258-AAA: RILEM AAR-13: application of alkali-wrapping for concrete prism testing to assess the expansion potential of alkali-silica reaction Peer-reviewed

    K. Yamada, Y. Kawabata, M. R. de Rooij, B. M. Pedersen, R. Brueckner, J. H. Ideker

    Materials and Structures 54 (6) 2021/12

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1617/s11527-021-01684-z  

    ISSN: 1359-5997

    eISSN: 1871-6873

  39. The long-term suppression effects of fly ash and slag on the expansion of heat-cured mortar due to delayed ettringite formation Peer-reviewed

    Yuichiro Kawabata, Haruka Takahashi, Sadayuki Watanabe

    Construction and Building Materials 310 125235-125235 2021/12

    Publisher: Elsevier BV

    DOI: 10.1016/j.conbuildmat.2021.125235  

    ISSN: 0950-0618

  40. Petrological assessment of drying shrinkage of sedimentary rock used as aggregates for concrete Peer-reviewed

    Yuichiro Kawabata, Masahiro Yahata, Shinichi Hirono

    Materials and Design 209 109922-109922 2021/11/01

    Publisher: Elsevier BV

    DOI: 10.1016/j.matdes.2021.109922  

    ISSN: 0264-1275

    eISSN: 1873-4197

  41. EXPOSURE TEST AND NUMERICAL SIMULATION ON THE INFLUENCE OF OUTDOOR WEATHER ACTION ON THE DRYING SHRINKAGE OF CONCRETE Peer-reviewed

    Keisuke MINOWA, Takumi SHIMOMURA, Yuichiro KAWABATA, Takashi FUJII, Jun TOMIYAMA

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 77 (4) 134-149 2021/10

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejmcs.77.4_134  

    eISSN: 2185-6567

  42. The influence of restraint on the expansion of concrete due to delayed ettringite formation Peer-reviewed

    Yuichiro Kawabata, Naoshi Ueda, Taito Miura, Stéphane Multon

    Cement and Concrete Composites 121 104062-104062 2021/08

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconcomp.2021.104062  

    ISSN: 0958-9465

  43. Replaceable superstructure system in open-type wharf for reliable maintenance of port concrete structures Peer-reviewed

    E. Kato, Y. Kawabata, T. Takahashi, Y. Izumida, E. Ooi, K. Kanemaru, K. Miyamaru, M. Iwanami, H. Yokota

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2041-2046 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-277  

  44. Performance based design and maintenance strategy with controlling ASR Peer-reviewed

    K. Yamada, T. Yamamoto, Y. Kawabata, Y. Sagawa, N. Ueda, Y. Kubo, S. Ogawa

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2579-2587 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-352  

  45. Mechanisms of internal swelling reactions: Recent advances and future research needs Peer-reviewed

    Y. Kawabata, K. Yamada, S. Ogawa, Y. Sagawa

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2599-2607 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-355  

  46. A method keeping total alkali content and maximizing water supply for concrete prism test of potential expansion by ASR Peer-reviewed

    K. Yamada, Y. Kawabata, S. Ogawa, Y. Sagawa

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2608-2612 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-356  

  47. A study on ASR expansion behavior of concrete exposed to natural environment for 5 years: Experimental and numerical approaches Peer-reviewed

    T. Kawakami, Y. Sagawa, Y. Kawabata, K. Yamada, S. Ogawa

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2637-2643 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-360  

  48. Expansion behavior of cement pastes containing additives due to delayed ettringite formation Peer-reviewed

    Haruka Takahashi, Shoichi Ogawa, Masahito Shibata, Mebae Kuranaga, Sadayuki Watanabe, Kentaro Mishiba, Yuichiro Kawabata

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2659-2663 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-363  

  49. Research on a new approach assessing ASR of concrete structures for nuclear facilities Peer-reviewed

    J. Eto, S. Ogawa, K. Shibuya, Y. Kawabata, G. Igarashi, A. Teramoto, I. Maruyama, K. Yamada

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations 2651-2658 2021/04/19

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-362  

  50. Influence of the distribution of expansive sites in aggregates on microscopic damage caused by alkali-silica reaction: Insights into the mechanical origin of expansion Peer-reviewed

    Taito Miura, Stéphane Multon, Yuichiro Kawabata

    Cement and Concrete Research 142 106355-106355 2021/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconres.2021.106355  

    ISSN: 0008-8846

  51. Physicochemical properties of the Portland cement-based mortar exposed to deep seafloor conditions at a depth of 1680 m Peer-reviewed

    Mari Kobayashi, Keisuke Takahashi, Yuichiro Kawabata

    Cement and Concrete Research 142 106335-106335 2021/04

    Publisher: Elsevier BV

    DOI: 10.1016/j.cemconres.2020.106335  

    ISSN: 0008-8846

  52. Action of Hydraulic Pressure on Portland Cement Mortars - Current Understanding and Related Progress of the First-Ever In-Situ Deep Sea Tests at a 3515 m Depth

    Keisuke Takahashi, Yuichiro Kawabata, Mari Kobayashi, Shinpei Gotoh, Shun Nomura, Takafumi Kasaya, Mitsuyasu Iwanami

    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 19 (3) 226-239 2021/03

    DOI: 10.3151/jact.19.226  

    ISSN: 1346-8014

    eISSN: 1347-3913

  53. Experimental and analytical studies on mechanical behavior of precast prestressed concrete-pile-joint for port pier

    池野勝哉, 石塚新太, 天谷公彦, 前嘉昭, 川端雄一郎, 加藤絵万, 岩波光保

    構造工学論文集 A(Web) 67A 2021

    ISSN: 1881-820X

  54. Net present value as an effective indicator leading to preventive maintenance of port mooring facilities Peer-reviewed

    Yuichiro Kawabata, Ema Kato, Hiroshi Yokota, Mitsuyasu Iwanami

    Structure and Infrastructure Engineering 16 (4) 714-725 2020/04

    DOI: 10.1080/15732479.2019.1676792  

    ISSN: 1573-2479

    eISSN: 1744-8980

  55. ESTABLISHMENT OF TECHNICAL STANDARDS FOR MAINTENANCE OF PORT AND HABOR FACILITIES IN VIETNAM BASED ON JAPANESE TECHNICAL STANDARDS AND THE FINDINGS GAINED FROM ITS PROCESS

    菅原法城, 宮田正史, 宮田正史, 加藤絵万, 川端雄一郎, 稲葉正明, 岩波光保, 福手勤, 中野敏彦

    土木学会論文集 B3(海洋開発)(Web) 76 (2) 2020

    ISSN: 2185-4688

  56. CYCLIC LOADING TEST AND ANALYTICAL STUDY ON PILE HEAD CONNECTION OF RAKING PILE FOR PORT PIER USING SLEEVE TUBE TYPE

    池野勝哉, 岩波光保, 川端雄一郎, 加藤絵万

    土木学会論文集 A1(構造・地震工学)(Web) 76 (4) 2020

    ISSN: 2185-4653

  57. BENDING LOAD TEST OF PRECAST BEAMS CONNECTED WITH DS JOINTS AND PROPOSAL FOR ITS SCOPE OF APPLICATION

    池野勝哉, 齊藤創太, 川端雄一郎, 加藤絵万, 岩波光保

    土木学会論文集 B3(海洋開発)(Web) 76 (2) 2020

    ISSN: 2185-4688

  58. Impact of temperature on expansive behavior of concrete with a highly reactive andesite due to the alkali–silica reaction Peer-reviewed

    Yuichiro Kawabata, Cyrille Dunant, Kazuo Yamada, Karen Scrivener

    Cement and Concrete Research 125 105888 2019/11

    DOI: 10.1016/j.cemconres.2019.105888  

    ISSN: 0008-8846

  59. Study on the Suppression Mechanism of Delayed Ettringite Formation by Solid state NMR Peer-reviewed

    Sadayuki WATANABE, Kentaro MISHIBA, Shoichi OGAWA, Haruka TAKAHASHI, Masahito SHIBATA, Moe KURANAGA, Yuichiro KAWABATA

    JCI-C98 231-234 2019/09

  60. Influence of High Temperature on Concrete Performance Peer-reviewed

    浅本晋吾, 岡崎慎一郎, 蔵重勲, 千々和伸浩, 川端雄一郎

    コンクリート工学 57 (6) 426-432 2019/06

    ISSN: 0387-1061

  61. Study on flexural capacity of precast beams connected with double-square shaped bar joints

    池野勝哉, 岩波光保, 川端雄一郎, 加藤絵万

    構造工学論文集 A(CD-ROM) 65 2019

    ISSN: 1881-6614

  62. PROPOSAL OF RAKING PILE CONNECTION WITH PRECAST SUPERSTRUCTURE FOR PORT PIER

    池野勝哉, BAI Ke, 岩波光保, 川端雄一郎, 加藤絵万

    土木学会論文集 B3(海洋開発)(Web) 75 (2) 2019

    ISSN: 2185-4688

  63. EXPERIMENTAL STUDY ON REINFORCEMENT OF RC CAISSON BY SOLIDIFICATION OF FILLING MATERIALS

    田中豊, 黒木賢一, 川端雄一郎, 加藤絵万, 染谷望

    土木学会論文集 B3(海洋開発)(Web) 75 (2) 2019

    ISSN: 2185-4688

  64. エトリンガイトの遅延生成(DEF)によるコンクリートの膨張およびひび割れ挙動に関する基礎的研究

    与那嶺一秀, 川端雄一郎, 高野大樹, 小川彰一, 柴田真仁

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 19 2019

    ISSN: 1346-7492

  65. 促進試験結果を基にした実環境下のコンクリートのASR膨張挙動に関する数値解析

    川上隆, 川端雄一郎, 山田一夫, 佐川康貴, 俵積田新也

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 19 2019

    ISSN: 1346-7492

  66. 一軸持続圧縮応力が作用するコンクリートのASR膨張挙動

    山本大介, 田城亨, 田城亨, 浜田秀則, 佐川康貴, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 19 2019

    ISSN: 1346-7492

  67. A maintenance management plan for port mooring facilities based on cost-benefit analysis—a case study Peer-reviewed

    Y. Kawabata, E. Kato, Y. Tanaka, H. Yokota

    Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 713-719 2019

  68. Fundamental study on effective utilization of caisson in breakwater Peer-reviewed

    E. Kato, Y. Kawabata, K. Uno, H. Yokota

    Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 681-685 2019

  69. Study on the spatial distribution of the chloride ion supply in the superstructure of an open-type wharf Peer-reviewed

    Y. Tanaka, Y. Kawabata, E. Kato

    Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 2659-2664 2019

  70. Proposal of Pile Connection Method with Precast Superstructure for Port Pier

    川端雄一郎, 池野勝哉, 加藤絵万, 岩波光保

    港湾空港技術研究所資料 (1359) 2075-2082 2019

    Publisher: CRC Press

    DOI: 10.1201/9780429279119-282  

    ISSN: 1346-7840

  71. 桟橋上部工への新しい点検技術の適用に関する一考察~LCCとNPVの観点から~

    川端雄一郎, 加藤絵万, 岩波光保, 横田弘

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 18 ROMBUNNO.136 2018/10/25

    ISSN: 1346-7492

  72. Diagnosis on expansion of heat-cured precast concrete blocks due to delayed ettringite formation in Japan Peer-reviewed

    Y. Kawabata

    6th International Conference on Durability of Concrete Structures, ICDCS 2018 516-524 2018

  73. Effects of Soak Solution Type on Alkali Release from Volcanic Aggregates ? Is Alkali Release Really Responsible for Accelerating ASR Expansion? ? Peer-reviewed

    Yuichiro Kawabata, Kazuo Yamada, Go Igarashi, Yasutaka Sagawa

    Journal of Advanced Concrete Technology 16 (1) 61-74 2018/01

    DOI: 10.3151/jact.16.61  

    ISSN: 1346-8014

    eISSN: 1347-3913

  74. Experimental study on effectiveness of retrofitting via normal strength concrete filling on damaged circular steel tubes subjected to axial and horizontal loads Peer-reviewed

    Yuichiro Kawabata, Yousuke Ohya, Ema Kato, Mitsuyasu Iwanami

    Construction and Building Materials 154 1-9 2017/11/15

    DOI: 10.1016/j.conbuildmat.2017.07.173  

    ISSN: 0950-0618

    eISSN: 1879-0526

  75. Macroscopic chemo-mechanical modeling of alkali-silica reaction of concrete under stresses Peer-reviewed

    Yuichiro Kawabata, Jean François Seignol, Renaud Pierre Martin, François Toutlemonde

    Construction and Building Materials 137 234-245 2017/04

    DOI: 10.1016/j.conbuildmat.2017.01.090  

    ISSN: 0950-0618

    eISSN: 1879-0526

  76. The mechanism of limited inhibition by fly ash on expansion due to alkali–silica reaction at the pessimum proportion Peer-reviewed

    Yuichiro Kawabata, Kazuo Yamada

    Cement and Concrete Research 92 1-15 2017/02/01

    DOI: 10.1016/j.cemconres.2016.11.002  

    ISSN: 0008-8846

    eISSN: 1873-3948

  77. Design of RC caissons for breakwater against repeated impact load due to collision of concrete blocks

    Y. Kawabata, E. Kato, K. Yamamoto, M. Iwanami

    Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016 522-529 2017

  78. Evaluation of alkalinity of pore solution based on the phase composition of cement hydrates with supplementary cementitious materials and its relation to suppressing ASR expansion Peer-reviewed

    Yuichiro Kawabata, Kazuo Yamada

    Journal of Advanced Concrete Technology 13 (11) 538-553 2015/11

    DOI: 10.3151/jact.13.538  

    ISSN: 1346-8014

    eISSN: 1347-3913

  79. A fundamental study on improvement of flexural capacity by lining method for pier piles using UHP-SHCC

    R. Tanaka, T. Amino, T. Habuchi, M. Kunieda, M. Iwanami, E. Kato, Y. Kawabata

    Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management - Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 1485-1490 2015

    DOI: 10.1201/b17618-220  

  80. Steel corrosion protective performance of UHP-SHCC with multiple fine cracks under bending

    T. Amino, R. Tanaka, T. Habuchi, M. Kunieda, E. Kato, Y. Kawabata, M. Iwanami

    Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management - Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 1703-1708 2015

    DOI: 10.1201/b17618-254  

  81. Investigation of monitoring method for detecting the cracks due to steel corrosion in concrete using specific resistivity Peer-reviewed

    T. Nishida, M. Iwanami, N. Otsuki, Y. Kawabata

    Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management - Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 1532-1537 2015

    DOI: 10.1201/b17618-227  

  82. DEVELOPMENT OF A DETERIORATION JUDGMENT METHOD FOR REINFORCED Peer-reviewed

    Shinichiro Okazaki, Ema Kato, Yuichiro Kawabata, Mitsuyasu Iwanami

    Proceedings of PIANC World Congress, San Francisco USA USB 2014/08

  83. Corrosion behavior of steel bars in reinforced concrete slabs repaired by partial patching Peer-reviewed

    E. Kato, Y. Kawabata, M. Iwanami

    Concrete Solutions - Proceedings of Concrete Solutions, 5th International Conference on Concrete Repair 83-89 2014

    DOI: 10.1201/b17394-14  

  84. Application of deterioration monitoring system to concrete superstructure of open-type wharf

    E. Kato, Y. Kawabata, M. Iwanami

    Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 2013

  85. Corrosion monitoring of steel bars in port concrete structures

    Mitsuyasu Iwanami, Ema Kato, Yuichiro Kawabata, Takahiro Nishida

    Sustainable Construction Materials and Technologies 2013-August 2013

    ISSN: 2515-3048

    eISSN: 2515-3056

  86. A study on strengthening method for pier piles using ultra high performance-strain hardening cementitious composite

    Ryoichi Tanaka, Minoru Kunieda, Mitsuyasu Iwanami, Ema Kato, Yuichiro Kawabata, Takahiko Amino

    Sustainable Construction Materials and Technologies 2013-August 2013

    ISSN: 2515-3048

    eISSN: 2515-3056

  87. Structural performance evaluation of heavily deteriorated RC members based on simplified inspection results Peer-reviewed

    Yuichiro Kawabata, Ema Kato, Mitsuyasu Iwanami

    International Journal of Structural Engineering 4 (1-2) 75-85 2013

    DOI: 10.1504/IJSTRUCTE.2013.050765  

    ISSN: 1758-7328

    eISSN: 1758-7336

  88. Fracture Prediction in Reinforced Concrete Using Mechanoluminescent Sensor

    LI Chenshu, XU Chao-Nan, ONO Daisuke, UENO Naohiro, KAWABATA Yuichiro

    Proceedings of the Japan Society for Photoelasticity 12 s205-s208 2012/07/01

    Publisher: The Japanese Society for Experimental Mechanics

    DOI: 10.11395/jjsem.12.s205  

    ISSN: 1346-4930

    More details Close

    The use of mechanoluminescent (ML) sensor in form of SrAl2O4:Eu (SAOE) film-coating to predict fracture in reinforced concrete structures is described. Four-point bending tests were performed, and strong and localized ML before cracking was found from the ML images of the SAOE film coated on the concrete surface. The location of the strong ML was in agreement with the location of the cracks caused by the increasing load. This indicates that crack formation can be predicted by using ML sensor. Along with loading, the real-time ML images also clearly showed crack growing on the concrete surface. The results show that the formation position, the propagation direction and the propagating process can be measured from the ML images directly and which crack is in developing can be judged by dynamic ML images. ML film sensor is available to predict fracture in reinforced concrete structures.

  89. Enhanced long-term resistance of concrete with marine sessile organisms to chloride ion penetration Peer-reviewed

    Yuichiro Kawabata, Ema Kato, Mitsuyasu Iwanami

    Journal of Advanced Concrete Technology 10 (4) 151-159 2012/04

    DOI: 10.3151/jact.10.151  

    ISSN: 1346-8014

    eISSN: 1347-3913

  90. Application of full-field non-contact measurement technology to clarification of deterioration mechanism on constructional material

    H. Goda, M. Hibino, Y. Kawabata, M. Uchino, H. Matsuda

    Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management 2182-2189 2012

    DOI: 10.1201/b12352-326  

  91. Probabilistic assessment for structural performance of port RC structure

    E. Kato, Y. Kawabata, M. Iwanami, H. Yokota

    Life-Cycle and Sustainability of Civil Infrastructure Systems - Proceedings of the 3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012 547-552 2012

  92. On the strength characteristics of dredged clay solidified with recycled cement

    Chee Ming Chan, Taka Aki Mizutani, Yoshiaki Kikuchi, Yuichiro Kawabata

    European Journal of Scientific Research 51 (4) 457-466 2011/04

    ISSN: 1450-216X

    eISSN: 1450-202X

  93. A numerical approach for damage evaluation of RC slab under single and repeated impact loading

    Hiroki Tamai, Yoshimi Sonoda, Yuichirou Kawabata, Makoto Shinozaki

    Proceedings of the 9th International Conference on Shock and Impact Loads on Structures 643-651 2011

  94. 港湾施設のアセットマネジメントの試行例

    岩波光保, 加藤絵万, 川端雄一郎

    海洋開発論文集 26 201-206 2010/06/17

    ISSN: 0912-7348

  95. Mitigating effect of fly ash on the asr-related expansion of mortar using reactive aggregate at the pessimum proportion

    T. Ikeda, Y. Kawabata, H. Hamada, K. Yamada

    Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010 473-482 2010

  96. New design proposal for simplified maintenance of open-type wharf

    Yuichiro Kawabata, Mitsuyasu Iwanami, Ema Kato, Hiroshi Yokota, Masahiko Furuichi

    Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas 718-719 2010

  97. Corrosion monitoring of steel bars in superstructure of open-type wharf Peer-reviewed

    Mitsuyasu Iwanami, Ema Kato, Yuichiro Kawabata

    Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010 361-366 2010

  98. Structural performance of heavily deteriorated RC members serviced in marine environment for 44 years Peer-reviewed

    Yuichiro Kawabata, Ema Kato, Mitsuyasu Iwanami

    Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010 491-497 2010

  99. PROBABILISTIC APPROACH FOR STRUCTURAL PERFORMANCE EVALUATION OF PORT RC STRUCTURE Peer-reviewed

    Ema Kato, Yuichiro Kawabata, Mitsuyasu Iwanami, Hiroshi Yokota

    ADVANCES IN CONCRETE STRUCTURAL DURABILITY: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON DURABILITY OF CONCRETE STRUCTURES ICDCS2010 483-490 2010

  100. Alkali silica reactivity of various andesites in saturated NaCl solution

    K. Yamada, T. Fujii, A. Imai, Y. Kawabata, H. Matsushita

    Proceedings of the 4th International Structural Engineering and Construction Conference, ISEC-4 - Innovations in Structural Engineering and Construction 1 525-531 2008

  101. ALKALI-SILICA REACTIVITY OF ANDESITE IN NACL SATURATED SOLUTION Peer-reviewed

    Takanori Ikeda, Yuichiro Kawabata, Hidenori Hamada, Yasutaka Sagawa

    ADVANCES IN CONCRETE STRUCTURAL DURABILITY, PROCEEDINGS OF ICDCS2008, VOLS 1 AND 2 563-569 2008

  102. Suppressing effect of fly ash composition on expansion of mortar due to alkali-silica reaction

    Yuichiro Kawabata, Hiromichi Matsushita

    American Concrete Institute, ACI Special Publication SP-242 279-292 2007/04

    ISSN: 0193-2527

Show all ︎Show first 5

Misc. 340

  1. 港湾・海洋建造物 PC桟橋上部工の維持管理

    田中豊, 加藤絵万, 川端雄一郎

    プレストレストコンクリート(プレストレストコンクリート工学会) 66 (2) 2024

    ISSN: 0387-1983

  2. 微視的視点を考慮したASRモデルを用いた構造解析に関する研究動向調査—Research Trend Survey on Structural Analysis Model for ASR with Microscopic Viewpoint

    戸田 圭彦, 三浦 泰人, 上田 尚史, 川端 雄一郎, 高橋 佑弥

    コンクリート工学 61 (10) 942-951 2023/10

    Publisher: 東京 : 日本コンクリート工学会

    ISSN: 0387-1061

  3. 遅延エトリンガイト生成(DEF)の診断-DEFの微視的特徴と観察において留意すべき点-

    吉田夏樹, 安藤陽子, 佐藤賢之介, 扇嘉史, 川端雄一郎

    コンクリート工学 61 (3) 273-282 2023/03

  4. Perspective on Seismic Design of Sheet Pile Quay Wall for Level-2 Ground Motions

    稲田滉平, 水谷崇亮, 野津厚, 小濱英司, 大矢陽介, 川端雄一郎, 竹信正寛, 近藤明彦, 田中豊, 松村聡, 田渡竜乃介, 田渡竜乃介

    港湾空港技術研究所資料(CD-ROM) (1410) 2023

    ISSN: 2436-035X

  5. 微視的機構に基づくコンクリート構造物中の内部膨張評価と予測に関する研究委員会 委員会報告書

    川端雄一郎, 櫻庭浩樹, 吉田夏樹, 安藤陽子, 三浦泰人, 高橋佑弥, 川端雄一郎, 三浦泰人, 戸田圭彦, 戸田圭彦, 戸田圭彦, 三浦泰人, 戸田圭彦, 三浦泰人, 上田尚史, 川端雄一郎, 高橋佑弥, 高橋佑弥, 三浦泰人, 高橋佑弥, 高橋佑弥, 三浦泰人, 三浦泰人, 上田尚史, 三浦泰人, 高橋佑弥, 三浦泰人, 佐川康貴, 佐川康貴, 吉田夏樹, 浅本晋吾, 上田尚史, 扇嘉史, 佐藤賢之介, 西岡由紀子, 佐川康貴, 川上隆, 吉田夏樹, 川端雄一郎, 安藤陽子, 高橋佑弥, 上田尚史, 関友則, 山本大介, 佐藤賢之介, 西岡由紀子, 吉田夏樹, 安藤陽子, 佐藤賢之介, 扇嘉史, 川端雄一郎, 五十嵐豪, 山本大介, 吉田夏樹, 宮本慎太郎, 高橋佑弥

    日本コンクリート工学会委員会報告書・論文集(CD-ROM) JCI-C103 2023

  6. Proposal of the verification method for joint section of raising an existing breakwater

    田中豊, 川端雄一郎, 小林怜夏, 竹信正寛, 横田弘, 山本修司, 鈴木高二朗, 下迫健一郎, 下迫健一郎

    港湾空港技術研究所資料(CD-ROM) (1413) 2023

    ISSN: 2436-035X

  7. リニューアル・解体・再利用 4.再利用 既設ケーソンの有効活用に向けた補強工法について

    田中豊, 川端雄一郎, 加藤絵万

    コンクリート工学 61 (5) 2023

    ISSN: 0387-1061

  8. Basic study on chloride ion penetration in a pile head-beam joint

    田中豊, 川端雄一郎, 加藤絵万, 池野勝哉, 天谷公彦, 岩波光保

    土木学会全国大会年次学術講演会(Web) 78th 2023

  9. Guideline for Maintenance and Management of PC Wharf Superstructure for Port Engineers

    加藤絵万, 田中豊, 川端雄一郎, 小笠原哲也, 渡瀬博, 石井豪, 河邊修作, 宮沢明良, 中山良直, 中嶋道雄, 立神久雄, 米倉宣行, 雨宮美子, 鈴鹿良和, 藤村立行

    港湾空港技術研究所資料(CD-ROM) (1400) 2022

    ISSN: 2436-035X

  10. Perspective on Seismic Design of Pile-Supported Wharves for Level-2 Ground Motions

    田渡竜乃介, 田渡竜乃介, 水谷崇亮, 野津厚, 小濱英司, 大矢陽介, 近藤明彦, 加藤絵万, 加藤絵万, 川端雄一郎, 田中豊, 竹信正寛, 松村聡, 浜本尚拓, 稲田滉平

    港湾空港技術研究所資料(CD-ROM) (1405) 2022

    ISSN: 2436-035X

  11. Numerical Analysis on Structural Performance of Deteriorated Piers with Prestressed Concrete Superstructure

    田中豊, 川端雄一郎, 加藤絵万, 鈴鹿良和, 石井豪, 立神久雄, 小笠原哲也, 河邊修作

    土木学会全国大会年次学術講演会(Web) 77th 2022

  12. Proposal of assembly construction method of precast prestressed concrete for port pier-Part 2: Alternatively cyclic loading tests on mechanical behavior of pile head joints

    栗原勇樹, 池野勝哉, 石塚新太, 天谷公彦, 前嘉昭, 川端雄一郎, 加藤絵万, 岩波光保

    土木学会全国大会年次学術講演会(Web) 77th 2022

  13. Cyclic Loading Test and Analytical Study on Pile Connection Method for Precast Superstructure of Port Pier

    田中豊, 池野勝哉, 加藤絵万, 川端雄一郎, 岩波光保

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 22 2022

    ISSN: 2434-7396

  14. Development of Assembled Precast Pier with Crimped Construction by Prestressing-Quick and Labor-saving Construction Method with Factory-produced Precast Concrete Members-

    田中豊, 池野勝哉, 石塚新太, 田中智宏, 金枝俊輔, 栗原勇樹, 前嘉昭, 天谷公彦, 中村菫, 川端雄一郎, 加藤絵万, 岩波光保

    港湾空港技術研究所報告(CD-ROM) 61 (1) 2022

    ISSN: 2436-035X

  15. コンクリートプリズム試験におけるアルカリ溶脱抑制法の比較および長期促進期間でのアルカリ量と膨張率の関係 Peer-reviewed

    川上隆, 佐川康貴, 山田一夫, 川端雄一郎

    コンクリート工学年次論文集 44 (1) 616-621 2022

  16. 一軸,三軸持続圧縮応力を受けるコンクリートのASR 進展に伴う変形挙動 Peer-reviewed

    山本大介, 川端雄一郎, 泉心太, 濱田秀則

    コンクリート工学年次論文集 44 (1) 610-615 2022

  17. Recent Trends in the Utilization of the Deep Sea and Efforts toward the Construction of Deep-Sea Infrastructure

    Y. Kawabata, K. Takahashi, T. Kasaya, M. Iwanami, T. Yamanaka

    Concrete Journal 60 (1) 51-55 2022

    Publisher: Japan Concrete Institute

    DOI: 10.3151/coj.60.1_51  

    ISSN: 0387-1061

    eISSN: 2186-2753

  18. 骨材に含まれる硫化鉄がコンクリートの膨張劣化に及ぼす影響

    宮本慎太郎, 安藤陽子, 川端雄一郎, 関 友則, 吉田夏樹

    コンクリート工学 59 (10) 894-900 2021/10

  19. Physicochemical damages on hardened cement-based material at deep seafloor

    M. Kobayashi, K. Takahashi, Y. Kawabata

    Proceedings of International Conference on Regeneration and Conservation of Structures 2021/09

  20. EVALUATION OF SHEAR CAPACITY OF PRECAST CONCRETE BEAM CONNECTED BY PRESTRESSING FOR PORT PIER

    石塚新太, 池野勝哉, 天谷公彦, 前嘉昭, 川端雄一郎, 加藤絵万, 岩波光保

    土木学会論文集 B3(海洋開発)(Web) 77 (2) 2021

    ISSN: 2185-4688

  21. Numerical Analysis on Structural Performance of Deteriorated Open-Type Wharf with Prestressed Concrete Superstructure

    田中豊, 川端雄一郎, 加藤絵万, 鈴鹿良和, 河邊修作, 中嶋道雄, 石井豪, 立神久雄, 小笠原哲也

    港湾空港技術研究所報告(CD-ROM) 60 (3) 2021

    ISSN: 2436-035X

  22. Determining the pH of concrete pore water for alkali-wrapped considering alkali dissolution from aggregate Peer-reviewed

    K. Yamada, Y. Kawabata, T. Kawakami, Y. Sagawa

    Proceedings of 16th International Conference on Alkali-Aggregate Reactions in Concrete 867-876 2021

  23. Influence of temperature on expansion due to alkali-silica reaction and numerical modeling Peer-reviewed

    Y. Kawabata, C. Dunant, K. Yamada, T. Kawakami

    Proceedings of 16th International Conference on Alkali-Aggregate Reactions in Concrete 225-236 2021

  24. Environmental impacts on ASR expansions -modeling, field exposure and alkali-wrapped concrete prism test Peer-reviewed

    Y. Kawabata, K. Yamada, S. Ogawa, Y. Sagawa

    Proceedings of 16th International Conference on Alkali-Aggregate Reactions in Concrete 213-224 2021

  25. Influence of different expansion models on the anisotropy of ASR expansion under restraint evaluated by 3D-RBSM Peer-reviewed

    T. Miura, S. Multon, Y. Kawabata

    Proceedings of 16th International Conference on Alkali-Aggregate Reactions in Concrete Volume II 511-522 2021

  26. Influence of DEF expansion on mechanical behavior under uniaxial compressive stress evaluated by Digital Image Correlation Peer-reviewed

    M. Fujishima, T. Miura, Y. Kawabata, H. Nakamura

    Proceedings of 16th International Conference on Alkali-Aggregate Reactions in Concrete Volume II 161-162 2021

  27. DEF膨張が生じたコンクリートの圧縮応力下での内部損傷進行の検討

    松本歩, JOSHI Nirmal Raj, 浅本晋吾, 川端雄一郎

    コンクリート工学年次論文集(CD-ROM) 43 2021

    ISSN: 2424-0281

  28. Latest scientific efforts for utilization of cementitious materials under extreme marine environments-deep sea

    高橋恵輔, 川端雄一郎, 笠谷貴史, 小林真理, 木村俊則, 岩波光保, 山中寿朗

    セメント・コンクリート (896) 2021

    ISSN: 0371-0718

  29. 深海3515mにおけるポルトランドセメント系材料の力学挙動原位置計測試験

    野村瞬, 高橋恵輔, 小林真理, 川端雄一郎, 笠谷貴史, 岩波光保, 山中寿朗, 牧田寛子, 後藤慎平

    海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM) 2021 2021

  30. Delayed Ettringite Formation

    川端雄一郎

    セメント・コンクリート (892) 2021

    ISSN: 0371-0718

  31. A study on Internationalization of Technical Standards for Port and Harbor Facilities of Japan: (Part4)-Study Example of Efforts to Assist in the Development of Technical Standards for Maintenance of Vietnam

    菅原法城, 宮田正史, 宮田正史, 加藤絵万, 川端雄一郎, 稲葉正明, 岩波光保, 福手勤, 中野敏彦

    国土技術政策総合研究所資料(Web) (1131) 2020

    ISSN: 1346-7328

  32. 固体NMR分析による遅延エトリンガイト生成の発生・抑制メカニズムの検討

    渡邊禎之, 小川彰一, 川端雄一郎

    Journal of the Society of Inorganic Materials, Japan 27 (405) 2020

    ISSN: 1345-3769

  33. セメントペースト硬化体の深海域での劣化-海水温の影響

    高橋恵輔, 小林真理, 川端雄一郎, 牧田寛子

    セメント技術大会講演要旨(CD-ROM) 74th 2020

  34. 深海底3,515mに約1年間暴露したモルタルに生じた劣化・損傷の評価

    川端雄一郎, 高橋恵輔, 野村瞬, 牧田寛子

    セメント技術大会講演要旨(CD-ROM) 74th 2020

  35. 桟橋RC上部工のセンサモニタリングの試行~25年経過報告~

    加藤絵万, 田中豊, 川端雄一郎, 岩波光保, 横田弘

    土木学会年次学術講演会講演概要集(CD-ROM) 75th 2020

  36. エポキシ樹脂被覆PC鋼より線を用いたPC桁のPC桟橋上部工への適用性に関する検討

    増田健, 田中豊, 加藤絵万, 川端雄一郎, 平川恭奨, 下村匠

    土木学会年次学術講演会講演概要集(CD-ROM) 75th 2020

  37. ダブルスクエア継手を用いたPCa梁の現場打ち幅縮小効果の検討

    齊藤創太, 池野勝哉, 川端雄一郎, 加藤絵万, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 75th 2020

  38. 係船柱用アンカーボルトの小型化に向けた設計法の比較

    中村健, 宮田正史, 中村俊之, 川端雄一郎, 尾崎竜三, 村上裕宣

    土木学会年次学術講演会講演概要集(CD-ROM) 75th 2020

  39. Analytical Study on The Effect of Strengthening of Caisson Components by Solidification of Filling Materials in Caisson

    川端雄一郎, 田中豊, 加藤絵万, 大矢陽介, 森川嘉之

    港湾空港技術研究所資料(CD-ROM) (1378) 2020

    ISSN: 2436-035X

  40. SUPPRESSING EFFECT OF FLY ASH ON EXPANSION OF HARDENED CEMENT PAST AND MORTAR DUE TO DELAYED ETTRINGITE FORMATION

    小川彰一, 川端雄一郎, 渡邊禎之

    セメント・コンクリート (864) 28-34 2019/02

    Publisher: セメント協会

    ISSN: 0371-0718

  41. INHIBITING EFFECT OF BLAST FURNACE SLAG ON ASR EXPANSION OF SEAWATER-MIXED CONCRETE

    川端 雄一郎, 羽渕 貴士, 忽那 惇, 与那嶺 一秀

    セメント・コンクリート (864) 42-47 2019/02

    Publisher: セメント協会

    ISSN: 0371-0718

  42. SUPPRESSING EFFECT OF FLY ASH ON EXPANSION OF HARDENED CEMENT PAST AND MORTAR DUE TO DELAYED ETTRINGITE FORMATION

    小川 彰一, 川端 雄一郎, 渡邊 禎之

    セメント・コンクリート (864) 28-34 2019/02

    Publisher: セメント協会

    ISSN: 0371-0718

  43. A field-experimental study on solidification of filling material in caisson toward enhanced resistance of caisson against repeated collision of concrete block

    川端雄一郎, 黒木賢一, 黒木賢一, 加藤絵万, 森川嘉之, 早川哲史

    港湾空港技術研究所資料 (1351) 2019

    ISSN: 1346-7840

  44. DEF膨張に対する高炉スラグ微粉末の長期抑制効果

    川端雄一郎, 小川彰一, 高橋晴香, 渡邊禎之

    セメント技術大会講演要旨(CD-ROM) 73rd 2019

  45. 各種混合材置換したペースト試験体を用いたDEF抑制効果の検討

    小川彰一, 藏永萌, 渡邊禎之, 川端雄一郎

    セメント技術大会講演要旨(CD-ROM) 73rd 2019

  46. DEFの生じたコンクリートに対する残存膨張性の評価方法の検討

    与那嶺一秀, 川端雄一郎, 小川彰一, 柴田真仁

    セメント技術大会講演要旨(CD-ROM) 73rd 2019

  47. 深海底に長期間暴露したセメント系材料の劣化挙動

    小林真理, 高橋恵輔, 川端雄一郎, 牧田寛子, 山中寿朗, 岩波光保

    ブルーアースサイエンス・テク要旨集 2019 2019

  48. PC桟橋上部工の破壊過程に関する載荷実験

    染谷望, 川端雄一郎, 加藤絵万, 村上裕幸

    プレストレストコンクリート(プレストレストコンクリート工学会) 61 (5) 2019

    ISSN: 0387-1983

  49. 中詰材の固化によるケーソン側壁の耐衝撃性向上に関する実験的検討

    黒木賢一, 田中豊, 川端雄一郎, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 74th 2019

  50. 中詰材の固化がケーソン側壁の耐荷力に及ぼす影響に関する実験的検討

    田中豊, 黒木賢一, 川端雄一郎, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 74th 2019

  51. 「DEFのリスクを考える」に関するシンポジウム 委員会報告書

    川端雄一郎, 羽原俊祐, 小川彰一, 兵頭彦次, 吉田夏樹, 浅本晋吾, 東洋輔, 五十嵐豪, 上原元樹, 臼井達哉, 蔵重勲, 斎藤豪, 玉滝浩司, 寺本篤史, 取違剛, 松下哲郎, 野村博史, 宮本慎太郎, 村岡史朗, 森泰一郎, 西岡由紀子

    日本コンクリート工学会論文集 JCI-C98 2019

  52. DEFによるコンクリートの膨張及びひび割れ挙動に関する検討

    与那嶺一秀, 川端雄一郎, 高野大樹, 小川彰一, 柴田真仁

    日本コンクリート工学会論文集 JCI-C98 2019

  53. Greening for improving the resilience of grey infrastructure assets Invited

    Y. Kawabata, L. A. Naylor

    Hydrolink 4 103-105 2019

  54. PC鋼材の維持管理技術 港湾における技術基準の最近の動向とPC構造物における維持管理上の課題と取組み

    川端雄一郎, 加藤絵万

    プレストレストコンクリート(プレストレストコンクリート工学会) 60 (6) 29‐34 2018/11/30

    ISSN: 0387-1983

  55. Introduction of the new technical standard for port and harbour facilities and current efforts to the maintenance of port PC structures

    川端 雄一郎, 加藤 絵万

    プレストレストコンクリート = Journal of prestressed concrete, Japan 60 (6) 29-34 2018/11

    Publisher: プレストレストコンクリート工学会

    ISSN: 0387-1983

  56. コンクリートの性能に及ぼす高温作用の影響評価研究小委員会(352委員会)成果報告書

    佐藤良一, 坂井悦郎, 浅本晋吾, 蔵重勲, 岡崎慎一郎, 川端雄一郎, 千々和伸浩, 伊藤隼人, 上田尚史, 上原元樹, 臼井達哉, 大野拓也, 小川由布子, 木ノ村幸士, 久我龍一郎, 車谷麻緒, 斎藤豪, 坂本亮, 佐々木謙二, 佐藤正己, 高橋恵輔, 高橋佑弥, 玉滝浩司, 取違剛, 芳賀和子, 人見尚, 藤井隆史, 矢ノ倉ひろみ, 山田雅宏, 米田大樹, 関健吾

    コンクリート技術シリーズ (120) 140P 2018/10/16

  57. 径厚比の違いを考慮した鋼管杭の耐震性能照査法―港湾施設に対する検討―

    塩崎禎郎, 大矢陽介, 小濱英司, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 73rd ROMBUNNO.I‐493 2018/08/01

  58. 室内試験および屋外暴露試験によるASR抑制対策の比較

    川端雄一郎, 染谷望, 田中豊, 河村直哉

    土木学会年次学術講演会講演概要集(CD-ROM) 73rd ROMBUNNO.V‐338 2018/08/01

  59. 防波堤上部工コンクリートの接合部の一体化に関する実験的検討

    染谷望, 川端雄一郎, 加藤絵万, 西田浩太, 網野貴彦

    土木学会年次学術講演会講演概要集(CD-ROM) 73rd ROMBUNNO.V‐112 2018/08/01

  60. 膨張試験および数値解析によるペシマム混合率の経時的変化に関する一考察

    俵積田新也, 川端雄一郎, 山田一夫, 佐川康貴, 村上光樹, 上野貴行, 上野貴行

    土木学会年次学術講演会講演概要集(CD-ROM) 73rd ROMBUNNO.V‐334 2018/08/01

  61. 埋設センサを用いた桟橋上部工における鉄筋腐食モニタリングの有効性に関する検討

    安藤翔太, 下村匠, 染谷望, 田中豊, 川端雄一郎, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 73rd ROMBUNNO.V‐344 2018/08/01

  62. セメント系構築物と周辺地盤の化学的相互作用研究小委員会(345委員会)第2期成果報告書

    乾徹, 加藤雅彦, 松山祐介, 泉尾英文, 伊代田岳史, 大山将, 清田正人, 佐々木崇, 高橋佑弥, 半井健一郎, 原弘行, 藤川拓郎, 宮下千花, 森勝伸, 橋本聖, 尾花誠一, 渡辺忠明, 斎藤豪, 橋本勝文, 吉田夏樹, 川端雄一郎, 取違剛, 浜本貴史, 藤井隆史, 三浦泰人, 宮本慎太郎

    コンクリート技術シリーズ (115) 195P 2018/06/20

  63. ブレイクスルーのための材料研究 2.劣化メカニズム 空隙水のアルカリ制御によるASRに対する材料設計

    川端雄一郎

    コンクリート工学 56 (5) 426‐430 2018/05/01

    ISSN: 0387-1061

  64. Materials Design Against Alkali-silica Reaction by Controlling Alkalinity of Pore Solution in Concrete

    川端 雄一郎

    コンクリート工学 56 (5) 426-430 2018/05

    Publisher: 日本コンクリート工学会

    ISSN: 0387-1061

  65. ASR促進試験におけるアルカリラッピングの濃度の検討

    村上光樹, 山田一夫, 川端雄一郎, 佐川康貴

    セメント技術大会講演要旨(CD-ROM) 72nd ROMBUNNO.3208 2018/04/30

  66. フライアッシュによるDEF抑制効果に関する検討

    小川彰一, 高橋晴香, 川端雄一郎, 渡邊禎之

    セメント技術大会講演要旨(CD-ROM) 72nd ROMBUNNO.3205 2018/04/30

  67. 鉄筋コンクリートのかぶりにより生じる鋼材の電位差の把握

    染谷望, 川端雄一郎, 加藤絵万

    材料と環境講演集 2018 119‐122 2018/04/27

  68. Cyclic loading experiment on steel pipe pile connection by sleeve tube type for port pier

    池野勝哉, 岩波光保, 川端雄一郎

    構造工学論文集 A(CD-ROM) 64 ROMBUNNO.7‐1 2018/03/15

    ISSN: 1881-6614

  69. Study on chloride ion diffusion property of concrete based on long-term exposure test and investigation to real structure

    与那嶺一秀, 山路徹, 加藤絵万, 川端雄一郎

    港湾空港技術研究所資料 (1339) 44p 2018/03

    ISSN: 1346-7840

  70. Study on chloride ion diffusion property of concrete based on long-term exposure test and investigation to real structure

    与那嶺 一秀, 山路 徹, 加藤 絵万, 川端 雄一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1339) 1-42 2018/03

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  71. Cyclic loading experiment on steel pipe pile connection by sleeve tube type for port pier

    池野 勝哉, 岩波 光保, 川端 雄一郎

    構造工学論文集. A A 64 724-733 2018/03

    Publisher: 土木学会 ; 2007-

    ISSN: 1881-6614

  72. 桟橋上部工への新しい点検技術の適用に関する一考察~LCCとNPVの観点から~

    川端雄一郎, 加藤絵万, 岩波光保, 横田弘

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM) 18 2018

    ISSN: 2434-7396

  73. Analysis on Chloride Induced Deterioration Progress in Superstructure of Open-type Wharf with Statistical Methods

    田中豊, 川端雄一郎, 加藤絵万

    港湾空港技術研究所資料 (1349) 2018

    ISSN: 1346-7840

  74. NONLINEAR FINITE ELEMENT ANALYSIS-BASED EVALUATION FOR STRUCTURAL PERFORMANCE OF SLEEVE TUBE TYPE ON STEEL PIPE PILE CONNECTION WITH SUPERSTRUCTURE

    池野勝哉, 岩波光保, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 74 (2) I_234‐I_239(J‐STAGE) 2018

    DOI: 10.2208/jscejoe.74.I_234  

    ISSN: 2185-4688

  75. ANALYSIS OF INFLUENCE FACTORS ON HETEROGENEOUS DISTRIBUTION OF CHLORIDE ION PENETRATION IN RC DECKS OF OPEN-TYPE WHARF

    田中豊, 川端雄一郎, 加藤絵万

    土木学会論文集 B3(海洋開発)(Web) 74 (2) I_73‐I_78(J‐STAGE)-I_78 2018

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejoe.74.I_73  

    ISSN: 2185-4688

    eISSN: 2185-4688

  76. FUNDAMENTAL STUDY FOR EFFECTIVE UTILIZATION OF EXISTING CONCRETE CAISSON

    加藤絵万, 川端雄一郎, 宇野健司, 宮田正史, 福手勤

    土木学会論文集 B3(海洋開発)(Web) 74 (2) I_384‐I_389(J‐STAGE) 2018

    DOI: 10.2208/jscejoe.74.I_384  

    ISSN: 2185-4688

  77. FUNDAMENTAL STUDY FOR EFFECTIVE UTILIZATION OF EXISTING CONCRETE CAISSON

    KATO Ema, KAWABATA Yuichiro, UNO Kenji, MIYATA Masafumi, FUKUTE Tsutomu

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74 (2) I_384-I_389 2018

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

    More details Close

     Following the performance-based design currently adopted in the Technical standards for port and harbor facilities in Japan, this paper discusses issues facing the effective utilization of existing caissons. When current design criteria were experimentally applied to caissons in existing breakwaters designed using previous methods, some caisson members were found to not satisfy their required performance. Based on the present maintenance techniques, issues related to performance evaluation of caisson members, repair and reinforcement of a caisson, and ensuring performance throughout the design service period were discussed.

  78. ANALYSIS OF INFLUENCE FACTORS ON HETEROGENEOUS DISTRIBUTION OF CHLORIDE ION PENETRATION IN RC DECKS OF OPEN-TYPE WHARF

    TANAKA Yutaka, KAWABATA Yuichiro, KATO Ema

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74 (2) I_73-I_78 2018

    Publisher: Japan Society of Civil Engineers

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     The progress of the chloride induced deterioration in the superstructure of an open-type wharf is not homogeneous. The chloride ion penetration in a slab of the superstructure of an open-type wharf is also not homogeneous. It is important to reveal the influence factors on heterogeneous distribution of chloride ion penetration in order to discuss where is the critical inspection points or areas in an open-type wharf.<br> The aim of this study is to reveal the factors underlying heterogeneous chloride ion penetration into concrete. The chloride ion contents of two slabs obtained from an open-type wharf that was about 30 years old were measured. The average chloride ion contents of each measurement depth from the surface of concrete in two slabs differed greatly. From the distributions of chloride ion content in each measurement depth in two slabs, it was found that the chloride ion contents at the land side of each slab was relatively higher than that at the middle and sea-side of the slabs.<br> In conclusion, it was found that the distribution of the chloride ion penetration was affected by factors including the location of the slab, the environmental conditions such as the sea level, and the other structural members surrounding the slab.

  79. NONLINEAR FINITE ELEMENT ANALYSIS-BASED EVALUATION FOR STRUCTURAL PERFORMANCE OF SLEEVE TUBE TYPE ON STEEL PIPE PILE CONNECTION WITH SUPERSTRUCTURE

    IKENO Katsuya, IWANAMI Mitsuyasu, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74 (2) I_234-I_239 2018

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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     To precast superstructure of port piers, the connection method for precast concrete with steel pipe piles is required at the rigidity condition which is based on port design criteria. As a new method, sleeve tube with larger diameter than steel pipe is buried into superstructure in advance, and steel pipe is inserted into it during erection with the gap filled with grouting, named “sleeve tube type” has been proposed. In this study, authors conducted a three-dimensional nonlinear finite element analysis on cyclic loading experiment of “sleeve tube type”, examined the effect of shear key, the insert length of steel pipe pile into sleeve tube, and discussed the stress transmission mechanism of the connection.

  80. Application of Modeling of Circular Steel Tube Considering Diameter-to-Thickness Ratio to Various Port Facilities

    大矢陽介, 塩崎禎郎, 塩崎禎郎, 小濱英司, 川端雄一郎

    港湾空港技術研究所資料 (1338) 38P 2017/12

    ISSN: 1346-7840

  81. Application of Modeling of Circular Steel Tube Considering Diameter-to-Thickness Ratio to Various Port Facilities

    大矢 陽介, 塩崎 禎郎, 小濱 英司, 川端 雄一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1338) 1-36 2017/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  82. コンクリートの配合がインピーダンススペクトルに与える影響

    染谷望, 星芳直, 川端雄一郎, 加藤絵万

    材料と環境討論会講演集 64th 125‐126 2017/10/18

  83. 杭頭部付近で著しく腐食した桟橋鋼管杭に対する高強度ひずみ硬化型セメント系材料と鋼板を用いた巻立て補強に関する検討

    田中亮一, 忽那惇, 加藤絵万, 網野貴彦, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 17 563‐568 2017/10/12

    ISSN: 1346-7492

  84. シアキー付鋼管と巻き立てた高強度ひずみ硬化型セメント系材料の接合部におけるずれ抵抗性に関する基礎的検討

    忽那惇, 田中亮一, 網野貴彦, 加藤絵万, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 17 557‐562 2017/10/12

    ISSN: 1346-7492

  85. アルカリラッピングしたコンクリートプリズム試験におけるコンクリートのASR膨張挙動のモデル化

    川端雄一郎, 山田一夫, 柳川貴光, 江藤淳二

    コンクリート構造物の補修,補強,アップグレード論文報告集 17 491‐496 2017/10/12

    ISSN: 1346-7492

  86. 反応速度論に基づくASR膨張モデルと長期曝露試験体の膨張挙動の比較

    上野貴行, 佐川康貴, 濱田秀則, 山田一夫, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 17 475‐480 2017/10/12

    ISSN: 1346-7492

  87. 桟橋上部工の劣化進行に影響を及ぼす要因の分析

    田中豊, 川端雄一郎, 加藤絵万

    コンクリート構造物の補修,補強,アップグレード論文報告集 17 599‐604 2017/10/12

    ISSN: 1346-7492

  88. 原子力関連施設コンクリートの新しいASR対策と診断

    山田一夫, 渋谷和俊, 小川彰一, 丸山一平, 寺本篤史, 五十嵐豪, 川端雄一郎, 江藤淳二

    日本コンクリート工学会論文集 JCI-C93 281‐290 2017/09/26

  89. アルカリ反応性を有する急速膨張性骨材のペシマム混合率の経時的変化に関する研究

    上野貴行, 川端雄一郎, 山田一夫, 佐川康貴

    日本コンクリート工学会論文集 JCI-C93 231‐238 2017/09/26

  90. コンクリート構造物のASR制御に向けた設計と維持管理の考え方

    川端雄一郎, 山本貴士, 山田一夫

    日本コンクリート工学会論文集 JCI-C93 291‐298 2017/09/26

  91. Practical Approach to Preventive Maintenance of Port Steel Structure

    加藤絵万, 染谷望, 川端雄一郎, 田土弘人, 山路徹, 仲谷伸人

    港湾空港技術研究所資料 (1336) 2‐18 2017/09

    ISSN: 1346-7840

  92. Practical Approach to Preventive Maintenance of Port steel Structure

    加藤 絵万, 染谷 望, 川端 雄一郎, 田土 弘人, 山路 徹, 仲谷 伸人

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1336) 1-18 2017/09

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  93. 固体NMRを用いた遅延エトリンガイト生成によるモルタルの膨張に及ぼすフライアッシュの抑制効果の検討

    渡邊禎之, 吉野徹, 川端雄一郎, 高橋晴香, 小川彰一

    日本原子力学会秋の大会予稿集(CD-ROM) 2017 ROMBUNNO.2H09 2017/08/29

  94. アルカリ溶液中におけるASR反応性骨材からのシリカ溶解挙動に関する検討

    上野貴行, 佐川康貴, 濱田秀則, 山田一夫, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.V‐444 2017/08/01

  95. 供用開始から約30年経過した桟橋上部工における塩化物イオン浸透の不均一性に関する検討

    井向日向, 下村匠, 田中豊, 川端雄一郎, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.V‐436 2017/08/01

  96. 径厚比の違いを考慮した鋼管杭のM‐φ関係について(その2:事例検討)

    塩崎禎郎, 大矢陽介, 小濱英司, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.I‐641 2017/08/01

  97. 遅延エトリンガイト生成による膨張に対するフライアッシュの長期的抑制効果

    川端雄一郎, 小川彰一, 高橋晴香, 渡邊禎之

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.V‐463 2017/08/01

  98. 生存時間解析を用いた桟橋上部工の劣化進行に影響を及ぼす要因の抽出

    田中豊, 川端雄一郎, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.V‐231 2017/08/01

  99. 径厚比の違いを考慮した鋼管杭のM‐φ関係について(その1:M‐φモデル算定法の提案)

    大矢陽介, 塩崎禎郎, 小濱英司, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 72nd ROMBUNNO.I‐642 2017/08/01

  100. モデル実験による高周波数域の容量性半円が形成される要因の基礎的検討

    染谷望, 星芳直, 川端雄一郎, 加藤絵万

    コンクリート工学年次論文集(CD-ROM) 39 ROMBUNNO.1294 2017/06/15

    ISSN: 2424-0281

  101. Proposal of Modeling of Circular Steel Tube for Seismic Performance Evaluation

    大矢陽介, 塩崎禎郎, 塩崎禎郎, 小濱英司, 川端雄一郎

    港湾空港技術研究所報告 56 (2) 3‐5,7‐33 2017/06

    ISSN: 1346-7832

  102. Proposal of Modeling of Circular Steel Tube for Seismic Performance Evaluation

    大矢 陽介, 塩崎 禎郎, 小濱 英司, 川端 雄一郎

    港湾空港技術研究所報告 = Report of the Port and Airport Research Institute 56 (2) 3-33 2017/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7832

  103. 長期室内試験に基づくDEF膨張の影響要因の評価

    川端雄一郎, 小川彰一, 高橋晴香, 佐川康貴

    セメント・コンクリート (840) 37‐41 2017/02/10

    ISSN: 0371-0718

  104. EVALUATION OF INFLUENCING FACTORS FOR DEF EXPANSION BASED ON LONG-TERM LABORATORY TESTS

    川端 雄一郎, 小川 彰一, 高橋 晴香, 佐川 康貴

    セメント・コンクリート (840) 37-41 2017/02

    Publisher: セメント協会

    ISSN: 0371-0718

  105. MODELING OF CIRCULAR STEEL TUBE CONSIDERING DIAMETER-TO-THICKNESS RATIO AND APPLICATION TO SEISMIC RESPONSE ANALYSIS OF PIER TYPE STRUCTURE

    大矢陽介, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 73 (2) I_384‐I_389(J‐STAGE) 2017

    DOI: 10.2208/jscejoe.73.I_384  

    ISSN: 2185-4688

  106. M-φ CHARACTERISTICS OF STEEL PIPE PILES CONSIDERING LOCAL BUCKLING

    塩崎禎郎, 大矢陽介, 小濱英司, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 73 (2) I_372‐I_377(J‐STAGE) 2017

    DOI: 10.2208/jscejoe.73.I_372  

    ISSN: 2185-4688

  107. A STUDY ON LOCAL CRACKING OF CONCRETE EXPOSED TO SEAWATER

    与那嶺一秀, 山路徹, 川端雄一郎

    セメント・コンクリート論文集(Web) 71 (1) 425‐431(J‐STAGE) 2017

    ISSN: 2187-3313

  108. INHIBITING EFFECT OF BLAST FURNACE SLAG ON ASR EXPANSION OF SEAWATER-MIXED CONCRETE

    川端雄一郎, 羽渕貴士, 忽那惇, 与那嶺一秀

    セメント・コンクリート論文集(Web) 71 (1) 323‐330(J‐STAGE) 2017

    ISSN: 2187-3313

  109. STUDY ON PUMPABILITY AND DURABILITY OF CORAL AGGREGATE CONCRETE

    山路徹, 与那嶺一秀, 川端雄一郎

    セメント・コンクリート論文集(Web) 71 (1) 394‐401(J‐STAGE) 2017

    ISSN: 2187-3313

  110. INHIBITING EFFECT OF BLAST FURNACE SLAG ON ASR EXPANSION OF SEAWATER-MIXED CONCRETE

    KAWABATA Yuichiro, HABUCHI Takashi, KUTSUNA Jun, YONAMINE Kazuhide

    Cement Science and Concrete Technology 71 (1) 323-330 2017

    Publisher: Japan Cement Association

    ISSN: 0916-3182

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    <p>The suppressing effect of blast furnace slag(BFS)on the ASR expansion of seawater-mixed concrete was investigated. Replacement level of BFS above 40wt% was turned out to prevent ASR expansion through the concrete prism tests for 3 years. Some analytical results suggested that the formation of C-S-H with lower Ca/Si ratio contributed to reduction in alkalinity of pore solution. From these results and thermodynamic modeling, the method to decide replacement level of BFS to prevent ASR expansion was discussed.</p>

  111. A STUDY ON LOCAL CRACKING OF CONCRETE EXPOSED TO SEAWATER

    YONAMINE Kazuhide, YAMAJI Toru, KAWABATA Yuichiro

    Cement Science and Concrete Technology 71 (1) 425-431 2017

    Publisher: Japan Cement Association

    ISSN: 0916-3182

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    <p>On surface layer of concrete subjected to seawater action over a long period of time, cracks and weakening accompanying local expansion may occur(hereinafter referred to as seawater deterioration). In this study, in order to estimate the cause of seawater deterioration, progress conditions of seawater deterioration were evaluated by marshalled common elements of specimens with seawater deterioration on exposure test sites and their environments. In addition, based on these, in order to grasp occurrence factors of seawater deterioration, the compositional change of hydrated cement was analyzed by thermodynamic phase equilibrium calculation, and volume change by the compositional change was estimated. From the result, it was inferred that the cause of seawater deterioration may be repetition of dissolution and precipitation of ettringite accompanying change of temperature and concentration of pore water.</p>

  112. STUDY ON PUMPABILITY AND DURABILITY OF CORAL AGGREGATE CONCRETE

    YAMAJI Toru, YONAMINE Kazuhide, KAWABATA Yuichiro

    Cement Science and Concrete Technology 71 (1) 394-401 2017

    Publisher: Japan Cement Association

    ISSN: 0916-3182

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    <p>A coral aggregate has many voids so that there is concern that the pumpability will be reduced due to the pressure absorption pressure and the durability will be lowered. In this paper, the influence of absorption in aggregate on pumpability was evaluated through pumping test in actual plant. In addition, the concrete was exposed to marine environment(for 3.5 years)and durability was examined.<br/>As a result, it was difficult to saturate the interior of the aggregate by immersion in water under atmospheric pressure, and it was confirmed that this property largely influences the pumpability. On the other hand, it showed that there is no significant difference in strength characteristics and mass transfer resistance of concrete compared with normal aggregate. The reason was considered to improve the structure of the transition zone at the aggregate interface.</p>

  113. Back to the future

    Kawabata Y

    Concrete Journal 55 (1) 16-20 2017

    Publisher: Japan Concrete Institute

    ISSN: 0387-1061

  114. M-φ CHARACTERISTICS OF STEEL PIPE PILES CONSIDERING LOCAL BUCKLING

    SHIOZAKI Yoshio, OHYA Yousuke, KOHAMA Eiji, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73 (2) I_372-I_377 2017

    Publisher: Japan Society of Civil Engineers

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     In seismic performance evaluation of pile supported wharves, the evaluation which calculated bending moment reaches full plastic moment or not is mostly performed with bilinear elasto-plastic model of <i>M-φ</i> characteristics (the full plastic moment is applied as the maximum bending moment). Since local buckling occurs in steel pipe piles with a large diameter-to-thickness ratio, which are used frequently by economical design, strength declines without reaching full plastic moment. There is a concern that has become a dangerous design. On the other hand, strength of steel pipe piles with a small diameter-to-thickness ratio continues to increase modestly even after yielding, and they have toughness against deformation. These effects cannot be evaluated in the <i>M-φ</i> characteristics. Therefore, we have tried to formulate strength and deformation characteristics of steel pipe pile by using three dimensional FEM analysis using shell elements.

  115. MODELING OF CIRCULAR STEEL TUBE CONSIDERING DIAMETER-TO-THICKNESS RATIO AND APPLICATION TO SEISMIC RESPONSE ANALYSIS OF PIER TYPE STRUCTURE

    OHYA Yousuke, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73 (2) I_384-I_389 2017

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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     The pier-type structures used in ports are frequently constructed using steel-pipe piles with a large diameter-to-thickness ratio (D/t) of 100 to suppress construction costs. The results of previous research, however, revealed that the values of these piles obtained for the full plastic moment using the cross-section calculation in design exceed the actual value. Therefore authors had performed experiments and numerical analyses using steel-pipe piles with large D/t in order to propose new modeling of the relationship between the bending moment and curvature reflecting the effect of D/t on deformation performance.<br> In this research, we evaluated the influence of the proposed modeling for steel-pipe pies with large D/t based on analytical results of seismic response analyses of a pile-type structure subjected to the level 2 earthquake motion.

  116. Back to the future (特集 コンクリート界の明日を担う研究者・技術者) -- (土木材料分野の若手)

    川端 雄一郎

    コンクリート工学 55 (1) 16-20 2017/01

    Publisher: 日本コンクリート工学会

    ISSN: 0387-1061

  117. Practical Approach to Maintenance of Mooring Facilities~Towards Practical Inspection based on Perfermance Degradation Chains~

    加藤絵万, 加藤絵万, 川端雄一郎, 川端雄一郎, 岩波光保, 岩波光保, 横田弘, 横田弘, 山路徹, 山路徹, 藤井敦, 内藤英晴, 北澤壮介, 井上博士, 柏原裕彦, 末岡英二, 吉田倫夫, 山本修司, 中野則夫, 稲田勉

    港湾空港技術研究所資料 (1328) 26P 2016/12

    ISSN: 1346-7840

  118. Fundamental study on rational design of structural member of caisson in breakwater

    宇野健司, 加藤絵万, 川端雄一郎

    港湾空港技術研究所資料 (1329) 33P 2016/12

    ISSN: 1346-7840

  119. Fundamental study on rational design of structural member of caisson in breakwater

    宇野 健司, 加藤 絵万, 川端 雄一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1329) 2-31 2016/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  120. Practical Approach to Maintenance of Mooring Facilities : Towards Practical Inspection based on Performance Degradation Chains

    加藤 絵万, 川端 雄一郎, 岩波 光保, 横田 弘, 山路 徹, 藤井 敦, 内藤 英晴, 北澤 壮介, 井上 博士, 柏原 裕彦, 末岡 英二, 吉田 倫夫, 山本 修司, 中野 則夫, 稲田 勉

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1328) 2-24 2016/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  121. DEF膨張と水和生成物に関する研究

    小川彰一, 渡邊禎之, 柴田真仁, 山田一夫, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 16 91‐96 2016/10/13

    ISSN: 1346-7492

  122. 海水を用いた高流動コンクリートのASR膨張とその抑制対策に関する実験的検討

    羽渕貴士, 川端雄一郎, 河村直哉, 忽那惇, 清宮理

    コンクリート構造物の補修,補強,アップグレード論文報告集 16 49‐54 2016/10/13

    ISSN: 1346-7492

  123. 第15回アルカリ骨材反応に関する国際会議(15th ICAAR)

    川端 雄一郎, 山田 一夫

    コンクリートテクノ 35 (9) 26-29 2016/09

    Publisher: セメント新聞社

    ISSN: 1346-1826

  124. セメント系材料へのアルカリイオンの収着に関する検討

    芳賀和子, 原澤修一, 渡邊禎之, 山田一夫, 川端雄一郎

    日本原子力学会秋の大会予稿集(CD-ROM) 2016 ROMBUNNO.1D11 2016/08/26

  125. セメント系材料の硫酸塩劣化(DEF)に関する検討

    渡邊禎之, 川端雄一郎, 山田一夫, 小川彰一

    日本原子力学会秋の大会予稿集(CD-ROM) 2016 ROMBUNNO.1D16 2016/08/26

  126. サンゴ骨材を用いたコンクリートのポンプ圧送性に関する検討

    山路徹, 与那嶺一秀, 川端雄一郎, 堀口浩司

    コンクリート工学年次論文集(CD-ROM) 38 ROMBUNNO.1300 2016/06/15

    ISSN: 2424-0281

  127. セメントペーストを用いたDEF膨張メカニズムの研究

    小川彰一, 青山弥佳子, 山田一夫, 川端雄一郎

    セメント技術大会講演要旨(CD-ROM) 70th ROMBUNNO.3317 2016/04/30

  128. コンクリートプリズム試験で起きている現象と評価結果の解釈

    山田一夫, 佐川康貴, 小川彰一, 川端雄一郎

    セメント技術大会講演要旨(CD-ROM) 70th ROMBUNNO.3219 2016/04/30

  129. 余震時耐震性能評価でRC上部工の損傷を考慮するための桟橋のモデル化方法

    大矢陽介, 川端雄一郎

    土木学会論文集 A1(構造・地震工学)(Web) 72 (4) I_777‐I_789(J‐STAGE) 2016

    DOI: 10.2208/jscejseee.72.I_777  

    ISSN: 2185-4653

  130. NUMERCAL MODELING OF OPEN-TYPE PIER WITH DAMAGED RC SUPERSTRUCTURE FOR SEISMIC PERFORMANCE RE-ASSESSMENT DURING AFTERSHOCK

    OHYA Yousuke, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 72 (4) I_777-I_789 2016

    Publisher: Japan Society of Civil Engineers

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     A purpose of this study is to make a determination criteria whether the facility can be used or not and building the most suitable restoration scenario for damaged open-type pier after earthquakes. An experiment and numerical analyses were conducted to evaluate the influence of damage on a RC superstructure in a pier caused by an earthquake ground motion and a load in service after the earthquake which affects seismic performance during an aftershock. Then, we confirmed seismic behavior of an open-type pier that the RC superstructure has received damage due to main shock and load in service after earthquake by seismic response analyses of ground which consider soil-pile interaction. As the result, residual strength of the RC superstructure during the aftershock decreased with increase of the damage due to horizontal displacement and load in service. The results of analysis indicated that even if damage of the RC superstructure is considered, residual displacements of open-type pier do not change. Then maximum curvature at the upper part of the steel pipe piles increased, but change of the maximum curvature at the underground section was insignificant.

  131. 桟橋RC上部工の点検診断における鉄筋腐食センサの活用に関する検討

    加藤絵万, 山本幸治, 川端雄一郎, 佐藤徹

    日本コンクリート工学会論文集 JCI-C88 (CD-ROM) ROMBUNNO.ROMBUNSHU,KATO 2015/09/07

  132. 共通試験結果に基づくコンクリートプリズムを用いたASR加速試験方法に関する考察

    佐川康貴, 合田寛基, 富山潤, 山田一夫, 久保善司, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 70th ROMBUNNO.V-548 2015/08/01

  133. 地震時にRC上部工が損傷した桟橋の耐震性能

    大矢陽介, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 70th ROMBUNNO.I-249 2015/08/01

  134. Application of Corrosion Monitoring Sensor to RC Superstructure of Open-Type Wharf

    加藤絵万, 山本幸治, 川端雄一郎, 岩波光保, 岩波光保

    港湾空港技術研究所資料 (1307) 17P 2015/06

    ISSN: 1346-7840

  135. Application of Corrosion Monitoring Sensor to RC Superstructure of Open-Type Wharf

    加藤 絵万, 山本 幸治, 川端 雄一郎

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1307) 2-15 2015/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  136. CORRECTIONS OF ESTIMATED ALKALINITY OF PORE SOLUTION AFFECTING ASR EXPANSION AND RE-CONSIDERATION OF THEIR INFLUENCES

    川端雄一郎, 山田一夫

    土木学会論文集 E2(材料・コンクリート構造)(Web) 71 (3) 257-262 (J-STAGE) 2015

    DOI: 10.2208/jscejmcs.71.257  

    ISSN: 2185-6567

  137. EVALUATION OF INFLUENCING FACTORS FOR DEF EXPANSION BASED ON LONG-TERM LABORATORY TESTS

    川端雄一郎, 小川彰一, 高橋晴香, 佐川康貴

    セメント・コンクリート論文集(Web) 69 (1) 527‐534(J‐STAGE) 2015

    ISSN: 2187-3313

  138. PREDICTION OF ASR EXPANSION OF FIELD-EXPOSED CONCRETE BASED ON ACCELERATED CONCRETE PRISM TEST WITH ALKALI-WRAPPING

    川端雄一郎, 山田一夫, 小川彰一, 佐川康貴

    セメント・コンクリート論文集(Web) 69 (1) 496‐503(J‐STAGE) 2015

    ISSN: 2187-3313

  139. IFSTTAR

    川端 雄一郎

    コンクリート工学 53 (8) 729-730 2015

    Publisher: 公益社団法人 日本コンクリート工学会

    ISSN: 0387-1061

  140. EVALUATION OF INFLUENCING FACTORS FOR DEF EXPANSION BASED ON LONG-TERM LABORATORY TESTS

    KAWABATA Yuichiro, OGAWA Shoichi, TAKAHASHI Haruka, SAGAWA Yasutaka

    Cement Science and Concrete Technology 69 (1) 527-534 2015

    Publisher: Japan Cement Association

    DOI: 10.14250/cement.69.527  

    ISSN: 0916-3182

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    The influencing factors such as cement composition, aggregate type and maximum temperature of heat-curing, were evaluated based on long-term laboratory tests. One of the results showed that even cement having 0.7 of SO<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio or 0.3 of DEF index showed deleterious DEF expansion. The result also pointed out one possibility that limestone aggregate accelerates onset of DEF expansion when the cement with low- SO<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio is used. The threshold maximum temperature of mortar without SO<sub>3</sub> dosage for DEF expansion was above 70 deg C from the experimental results though it strongly depended on SO<sub>3</sub> content of cement.

  141. PREDICTION OF ASR EXPANSION OF FIELD-EXPOSED CONCRETE BASED ON ACCELERATED CONCRETE PRISM TEST WITH ALKALI-WRAPPING

    KAWABATA Yuichiro, YAMADA Kazuo, OGAWA Shoichi, SAGAWA Yasutaka

    Cement Science and Concrete Technology 69 (1) 496-503 2015

    Publisher: Japan Cement Association

    DOI: 10.14250/cement.69.496  

    ISSN: 0916-3182

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    This paper presented the applicability of a new laboratory expansion test in which concrete specimens are wrapped with clothes or papers containing alkali solution in order to avoid alkali leaching and drying(AW-CPT;Concrete Prism Test with Alkali-Wrapping). The temperature-dependency of ASR expansion was characterized with fitting by modelled equation. Then the expansion behaviour of field-exposed concrete block was calculated. The results strongly suggested that the predicted expansion behaviour based on AW-CPT was well agreed with one of field-exposed concrete, compared to conventional CPT. Future perspectives were also described.

  142. CORRECTIONS OF ESTIMATED ALKALINITY OF PORE SOLUTION AFFECTING ASR EXPANSION AND RE-CONSIDERATION OF THEIR INFLUENCES

    KAWABATA Yuichiro, YAMADA Kazuo

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 71 (3) 257-262 2015

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-6567

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     This paper corrects the estimated values of alkalinity of pore solution published in the previous study and shows the effect on the conclusion in the published study. Although it is required to correct the absolute value, the corrections do not affect the conclusions described in the published study. By comparing to previous studies relating alkalinity estimation, the absolute values of alkalinity of pore solution after correction are re-considered.

  143. Steel Corrosion Monitoring for RC Deck of Open Type Wharf by embedded sensor

    岡崎慎一郎, 加藤絵万, 川端雄一郎, 岩波光保

    港湾空港技術研究所資料 (1294) 28P-26 2014/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  144. Life-Cycle cost analysis of maintenance scenario for concrete superstructure of open-type wharf

    野上周嗣, 加藤絵万, 川端雄一郎, 佐藤徹

    港湾空港技術研究所資料 (1296) 97P 2014/12

    ISSN: 1346-7840

  145. Structural performance of steel pipe pile jacketed with UHP-SHCC for open-type piers

    川端雄一郎, 忽那惇, 忽那惇, 加藤絵万, 岩波光保, 岩波光保, 羽渕貴士, 網野貴彦, 田中亮一, 国枝稔

    港湾空港技術研究所資料 (1295) 23P 2014/12

    ISSN: 1346-7840

  146. Life-Cycle cost analysis of maintenance scenario for concrete superstructure of open-type wharf

    野上 周嗣, 加藤 絵万, 川端 雄一郎

    港湾空港技術研究所資料 (1296) 2-95 2014/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  147. Steel Corrosion Monitoring for RC Deck of Open Type Wharf by embedded sensor

    岡崎 慎一郎, 加藤 絵万, 川端 雄一郎

    港湾空港技術研究所資料 (1294) 2-26 2014/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  148. Structural performance of steel pipe pile jacketed with UHP-SHCC for open-type piers

    川端 雄一郎, 忽那 惇, 加藤 絵万

    港湾空港技術研究所資料 (1295) 2-21 2014/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  149. 径厚比および軸力の影響を考慮した円形鋼管のM‐Φ算定法

    忽那惇, 川端雄一郎, 大矢陽介, 加藤絵万, 岩波光保

    鋼構造年次論文報告集(CD-ROM) 22 ROMBUNNO.23 2014/11

    ISSN: 2188-1618

  150. アルカリシリカ反応入門 2)アルカリシリカ反応の基礎~抑制対策~

    川端雄一郎

    コンクリート工学 52 (11) 1018-1024 2014/11/01

    Publisher: Japan Concrete Institute

    DOI: 10.3151/coj.52.1018  

    ISSN: 0387-1061

  151. M-Φ model for circular steel tube considering the effect of diameter-to-thickness ratio and axial force

    忽那 惇, 川端 雄一郎, 大矢 陽介

    鋼構造年次論文報告集 Proceedings of constructional steel 22 160-166 2014/11

    Publisher: 日本鋼構造協会

    ISSN: 2188-1642

  152. M-Φ Model for Circular Steel Tube for Port Pier-type Structures

    川端雄一郎, 忽那惇, 加藤絵万, 大矢陽介, 小濱英司, 岩波光保, 岩波光保

    港湾空港技術研究所資料 (1288) 19P 2014/09

    ISSN: 1346-7840

  153. M-Φ Model for Circular Steel Tube for Port Pier-type Structures

    川端 雄一郎, 忽那 惇, 加藤 絵万

    港湾空港技術研究所資料 (1288) 2-17 2014/09

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  154. 重力式係船岸における空洞の発生状況に関する分析

    堂坂康二, 佐藤徹, 加藤絵万, 川端雄一郎, 岡崎慎一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 69th ROMBUNNO.V-269 2014/08/01

  155. 急速膨張性および遅延膨張性骨材を用いたコンクリートにおけるASR膨張挙動の予測

    山田一夫, 大迫政浩, 小川彰一, 佐川康貴, 山本大介, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 69th ROMBUNNO.V-166 2014/08/01

  156. ひび割れを有する超高強度ひずみ硬化型モルタルの海洋環境下における鋼材防食性能について

    水田潤, 田中亮一, 国枝稔, 岩波光保, 加藤絵万, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 69th ROMBUNNO.V-255 2014/08/01

  157. アルカリ骨材反応の抑制効果の評価方法と膨張予測の新しい考え方

    山田一夫, 大迫政浩, 小川彰一, 佐川康貴, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 69th ROMBUNNO.V-481 2014/08/01

  158. 鉄筋腐食が進行するRCはりの疲労特性に関する実験的検討

    岡崎慎一郎, 加藤絵万, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 69th ROMBUNNO.V-610 2014/08/01

  159. 鉄筋コンクリート構造物の設計システム―Back to the Future II―

    渡辺忠朋, 斉藤成彦, 井口重信, 小川晃, 尾上幸造, 川端雄一郎, 京野光男, 齋藤隆, 笹谷輝勝, 下村匠, 平陽兵, 高橋良輔, 滝本和志, 土屋智史, 内藤英樹, 中島章典, 西恭彦, 橋本勝文, 服部尚道, 平野勝識, 古内仁, 牧剛史, 渡辺健, 渡辺伸和

    コンクリート技術シリーズ (104) 314P 2014/07/16

  160. ASR診断の現状とあるべき姿研究委員会

    山田一夫, 川端雄一郎, 久保善司, 合田寛基, 佐川康貴, 広野真一

    コンクリート工学年次論文集(CD-ROM) 36 ROMBUNNO.0001 2014/06/15

    ISSN: 2424-0281

  161. 重量コンクリートを用いた鉄筋コンクリートはりの構造性能

    川端雄一郎, 加藤絵万, 河村直哉, 岩波光保

    コンクリート工学年次論文集(CD-ROM) 36 ROMBUNNO.1288 2014/06/15

    ISSN: 2424-0281

  162. An Experimental Study on Applicability of Heavy Weight Concrete to Port Structures

    川端雄一郎, 加藤絵万, 河村直哉, 山路徹, 岩波光保

    港湾空港技術研究所資料 (1287) 20P 2014/06

    ISSN: 1346-7840

  163. An Experimental Study on Applicability of Heavy Weight Concrete to Port Structures

    川端 雄一郎, 加藤 絵万, 河村 直哉

    港湾空港技術研究所資料 (1287) 2-18 2014/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  164. SIMPLIFIED PREDICTION OF ASR EXPANSION OF CONCRETE BASED ON ACCELERATED CONCRETE PRISM TEST

    川端雄一郎, 山田一夫, 小川彰一, 佐川康貴

    セメント・コンクリート論文集 67 449-455 2014/02/25

    DOI: 10.14250/cement.67.449  

    ISSN: 0916-3182

  165. REPORT ON CAVITY DETECTED IN BACK-FILL OF MOORING FACILITIES

    佐藤徹, 加藤絵万, 川端雄一郎, 岡崎慎一郎

    土木学会論文集 B3(海洋開発)(Web) 70 (2) I.552-I.557 (J-STAGE) 2014

    DOI: 10.2208/jscejoe.70.I_552  

    ISSN: 2185-4688

  166. コンクリートのASRによる膨張挙動予測に関する研究

    小川彰一, 山田一夫, 大迫政浩, 佐川康貴, 川端雄一郎

    コンクリート技術大会(CD-ROM) 4th 43-46 2014

  167. EXPERIMENT CONCERNING THE REINFORCEMENT OF THE STEEL PILES HEAD OF OPEN-TYPE WHARF BY JACKETING UHP-SHCC

    忽那惇, 国枝稔, 岩波光保, 加藤絵万, 川端雄一郎, 田中亮一, 網野貴彦, 羽渕貴士

    土木学会論文集 B3(海洋開発)(Web) 70 (2) I.834-I.839 (J-STAGE) 2014

    DOI: 10.2208/jscejoe.70.I_834  

    ISSN: 2185-4688

  168. A STUDY ON THE DESIGN METHOD OF RC CAISSONS FOR BREAKWATERS AGAINST IMPACT LOADS CONSIDERING MAINTENANCE STRATEGY

    川端雄一郎, 加藤絵万, 岩波光保

    土木学会論文集 B3(海洋開発)(Web) 70 (2) I.828-I.833 (J-STAGE) 2014

    DOI: 10.2208/jscejoe.70.I_828  

    ISSN: 2185-4688

  169. A STUDY ON ALKALI AGGREGATE REACTION IN NUCLEAR POWER RELATING FACILITIES

    山田一夫, 川端雄一郎, 小川彰一, 丸山一平

    セメント・コンクリート論文集(Web) 68 (1) 457‐464(J‐STAGE) 2014

    ISSN: 2187-3313

  170. 新技術の利活用及び技術開発の強化 港湾コンクリート構造物の点検診断技術

    川端雄一郎

    月刊建設 58 (1) 31-33 2014/01

    Publisher: 全日本建設技術協会

  171. A STUDY ON ALKALI AGGREGATE REACTION IN NUCLEAR POWER RELATING FACILITIES

    YAMADA Kazuo, KAWABATA Yuichiro, OGAWA Shoichi, MARUYAMA Ippei

    Cement Science and Concrete Technology 68 (1) 457-464 2014

    Publisher: Japan Cement Association

    DOI: 10.14250/cement.68.457  

    ISSN: 0916-3182

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    An application of advanced knowledge on alkali aggregate silica reaction(ASR)for new construction and ageing management of nuclear-powder-relating-facilities is discussed. At first, the concept of ASR expansion in nuclear-power-relating-facilities is proposed. Then, the characteristics and limit of various expansion tests are compared and critically discussed. Moreover, considering the quantification of long term ASR expansion, suitable condition of concrete prism test(CPT)enabling the quantitative estimation is introduced. In CPT, the expansion is accelerated by alkali boosting and higher temperature and alkali-wrapping is a promising method avoiding alkali leaching and keeping stable moisture supply. In this study, the expansion behaviors of CPT are described by three parameters, i.e. ultimate expansion, expanding speed, time to start expansion, and the dependencies on alkali amount and temperature are estimated. Then, expansion behavior estimation is become possible to estimate in any alkali amounts and environmental temperature.

  172. アルカリシリカ反応入門 ②アルカリシリカ反応の基礎~抑制対策~

    川端 雄一郎

    コンクリート工学 52 (11) 1018-1024 2014

    Publisher: 公益社団法人 日本コンクリート工学会

    DOI: 10.3151/coj.52.1018  

    ISSN: 0387-1061

  173. 桟橋上部工の維持管理シナリオに関する検討

    野上 周嗣, 加藤 絵万, 川端 雄一郎

    国土交通省国土技術研究会論文集 97-102 2014

    Publisher: 国土交通省

  174. SIMPLIFIED PREDICTION OF ASR EXPANSION OF CONCRETE BASED ON ACCELERATED CONCRETE PRISM TEST

    KAWABATA Yuichiro, YAMADA Kazuo, OGAWA Shoichi, SAGAWA Yasutaka

    Cement Science and Concrete Technology 67 (1) 449-455 2014

    Publisher: Japan Cement Association

    ISSN: 0916-3182

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    Simplified prediction method using accelerated concrete prism test(CPT)for actual concrete mixture and simultaneously the test procedure for CPT required for the prediction were proposed. The prediction based on the result of CPT roughly coincided the expansion behaviors of concrete blocks(400×400×600mm)exposed to outdoors for two years. The result suggested that the proposed prediction method is not a mere aggregate test but is useful for the evaluation of actual concrete mixture although the method includes many rooms to improve. In addition, the way of calculation for accelerated ratio of CPT to realistic mixture proportion and exposure condition was discussed by using the proposed prediction. This prediction method can change the design procedure of concrete structure relating ASR. Based on the required service life of structures, it is possible to determine the duration of CPT from the calculation of accelerated ratio.

  175. REPORT ON CAVITY DETECTED IN BACK-FILL OF MOORING FACILITIES

    SATO Toru, KATO Ema, KAWABATA Yuichiro, OKAZAKI Shinichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70 (2) I_552-I_557 2014

    Publisher: Japan Society of Civil Engineers

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     To keep the performance of port facilities, the series of maintenance works, inspection, performance evaluation and countermeasure, have to be appropriately executed throughout their service lives. In 2013, Port and Harbor Bureau, MLIT carried out the urgent inspection of port facilities to understand the actual condition of deterioration and deflection in those facilities. This paper reports the result of the nationwide survey of cavity in the mooring facilities. The authors particularly analyzed the following topics: 1) Variation in the location of cavity in a quaywalls; and 2) Influence of cavity on the visually judged deterioration grades of the structural members, such as concrete and asphalt aprons, steel sheet pile and cooping concrete. Based on these analyses, the future action policy for the cavity detection and countermeasures were discussed to achieve the strategic maintenance of mooring facilities.

  176. A STUDY ON THE DESIGN METHOD OF RC CAISSONS FOR BREAKWATERS AGAINST IMPACT LOADS CONSIDERING MAINTENANCE STRATEGY

    KAWABATA Yuichiro, KATO Ema, IWANAMI Mitsuyasu

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70 (2) I_828-I_833 2014

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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     In breakwaters covered with wave-dissipating blocks, outer walls of the caisson may show local failure in repeated collision of the blocks. Local failure induces drainage of the filling in the caisson so that the self-weight of the caisson would be reduced. This failure of the outer wall decreases stability of the caisson against sliding and harbor calmness. The design and verification method of the caisson and the preventive measures against such accidental impact loads are necessary to be developed while they have not been established so far. When the preventive measures are implemented, it is important that the life-cycle cost (LCC) would be considered. This paper investigated the advantageous conditions of the preventive measures from the viewpoint of LCC reduction considering the ratio of failed caisson to total ones, by comparing the cost for the preventive measures and the cost for post-failure repair.

  177. EXPERIMENT CONCERNING THE REINFORCEMENT OF THE STEEL PILES HEAD OF OPEN-TYPE WHARF BY JACKETING UHP-SHCC

    KUTSUNA Jun, KUNIEDA Minoru, IWANAMI Mitsuyasu, KATO Ema, KAWABATA Yuichiro, TANAKA Ryoichi, AMINO Takahiko, HABUCHI Takashi

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70 (2) I_834-I_839 2014

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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     In this paper, the authors have developed a new protective covering system which can ensure the anticorrosion of steel piles and strengthening of joint parts between steel pile and beams of the concrete superstructure by applying the Ultra High Performance-Strain Hardening Cementations composites, UHP-SHCC, which is one of the fiber reinforcement mortars using the synthetic short fibers. The authors evaluate the effect of the improvement of flexural capacity of the steel piles and joint parts between a steel pile and a beam of a superstructure. The large scale flexural loading tests of tested steel piles, to which the UHP-SHCC protective covering system was applied, were performed in the laboratory.<br> From the loading test and discussions, the authors confirmed that the UHP-SHCC protective covering system efficiently contributed to improvement the flexural capacity.

  178. 港湾コンクリート構造物の点検診断技術 (特集 新技術の利活用及び技術開発の強化)

    川端 雄一郎

    月刊建設 58 (1) 31-33 2014/01

    Publisher: 全日本建設技術協会

  179. A Study on the Design Method of RC Caissons for Breakwaters Against Impact Loads Considering Maintenance Strategy

    川端雄一郎, 加藤絵万, 岩波光保

    港湾空港技術研究所資料 (1279) 55P 2013/12

    ISSN: 1346-7840

  180. A Study on the Design Method of RC Caissons for Breakwaters Against Impact Loads Considering Maintenance Strategy

    川端 雄一郎, 加藤 絵万, 岩波 光保

    港湾空港技術研究所資料 (1279) 2-14,中扉2p,巻末1-17,巻末20p 2013/12

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  181. 超高強度ひずみ硬化型モルタルを用いた桟橋鋼管杭の補強工法

    田中亮一, 網野貴彦, 羽渕貴士, 国枝稔, 岩波光保, 加藤絵万, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 13 5-6 2013/11/08

    ISSN: 1346-7492

  182. 加速コンクリートプリズム試験を用いたコンクリートのASR膨張予測に関する試み

    川端雄一郎, 山田一夫, 小川彰一, 大迫政浩

    コンクリート構造物の補修,補強,アップグレード論文報告集 13 453-458 2013/11/08

    ISSN: 1346-7492

  183. 海洋環境における超高性能ひずみ硬化型セメント系材料の長期耐久性の検討

    松本拓也, 岩崎英治, 加藤絵万, 川端雄一郎, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 68th ROMBUNNO.V-008 2013/08/01

  184. 超高強度ひずみ硬化型モルタルの水中施工への適用性に関する検討

    水田潤, 網野貴彦, 国枝稔, 加藤絵万, 川端雄一郎, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 68th ROMBUNNO.V-007 2013/08/01

  185. コンクリート比抵抗の環境作用依存性を活用した腐食ひび割れモニタリング手法の構築

    西田孝弘, 岩波光保, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 68th ROMBUNNO.V-266 2013/08/01

  186. 重晶石および人工重量骨材を用いたコンクリートの力学特性

    川端雄一郎, 加藤絵万, 河村直哉, 岩波光保

    コンクリート工学年次論文集(CD-ROM) 35 ROMBUNNO.1242 2013/06/15

    ISSN: 2424-0281

  187. 岩石学的評価に基づいた空港コンクリート舗装のASR劣化事例解析

    河村直哉, 川端雄一郎, 片山哲哉, 片山哲哉

    コンクリート工学年次論文集(CD-ROM) 35 ROMBUNNO.1165 2013/06/15

    ISSN: 2424-0281

  188. 海洋環境下の土中に位置するコンクリート中の塩化物イオンの浸透性状の評価

    松本拓也, 岩崎英治, 加藤絵万, 川端雄一郎

    セメント技術大会講演要旨(CD-ROM) 67th ROMBUNNO.1307 2013/04/30

  189. 震災復興と港湾技術 東日本大震災の教訓を踏まえた技術開発 地震動により損傷した桟橋上部工の残存耐力評価

    川端雄一郎

    港湾 90 (3) 32-33 2013/03/25

    ISSN: 0287-4733

  190. Development of Structural Design Method of Piers Considering Maintenance Strategy

    岩波光保, 加藤絵万, 川端雄一郎

    港湾空港技術研究所資料 (1268) 45P 2013/03

    ISSN: 1346-7840

  191. Residual Structural Performance Evaluation of RC Superstructure of Open-Type Pier Damaged by Earthquake Ground Motion

    川端雄一郎, 岩波光保, 加藤絵万, 西田孝弘, 西田孝弘

    港湾空港技術研究所資料 (1267) 34P 2013/03

    ISSN: 1346-7840

  192. 地震動により損傷した桟橋RC上部工の残存性能

    川端雄一郎, 岩波光保, 加藤絵万, 西田孝弘

    構造工学論文集 A(CD-ROM) 59 ROMBUNNO.2-4-103 2013/03/01

    Publisher: Japan Society of Civil Engineers

    DOI: 10.11532/structcivil.59A.91  

    ISSN: 1881-6614

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    The port facilities have been recognized as emergent supply transporting base in order to provide assistance for rehabilitation of disaster-affected areas. A system to evaluate the residual structural performance of the damaged facilities is required to judge whether the facility can be used or not. This paper deals with the residual structural performance of RC superstructure of open-type wharf damaged by earthquake. From the results of loading tests on the 1/4 scaled model, the failure process and the residual load carrying capacity of the RC superstructure after the earthquake are investigated.

  193. Residual Structural Performance Evaluation of RC Superstructure of Open-Type Pier Damaged by Earthquake Ground Motion

    川端 雄一郎, 岩波 光保, 加藤 絵万

    港湾空港技術研究所資料 (1267) 2-32 2013/03

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  194. Development of Structural Design Method of Piers Considering Maintenance Strategy

    岩波 光保, 加藤 絵万, 川端 雄一郎

    港湾空港技術研究所資料 (1268) 2-30 2013/03

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  195. 製鋼スラグ混合土の固化進行過程の検討と固化部のEPMA分析

    平井壮, 川端雄一郎, 水谷崇亮, 菊池喜昭

    地盤工学研究発表会発表講演集(CD-ROM) 48th ROMBUNNO.337 2013

  196. RELATION OF PHASE COMPOSITION OF CEMENT HYDRATES WITH SUPPLEMENTARY CEMENTITIOUS MATERIALS TO THE SUPPRESSING EFFECT ON ASR EXPANSION

    川端雄一郎, 山田一夫, 松下博通

    土木学会論文集 E2(材料・コンクリート構造)(Web) 69 (4) 402-420 (J-STAGE) 2013

    DOI: 10.2208/jscejmcs.69.402  

    ISSN: 2185-6567

  197. Residual structural performance of RC superstructure of open-type wharf damaged by earthquake

    Kawabata Yuichiro, Iwanami Mitsuyasu, Kato Ema, Nishida Takahiro

    Kozo Kogaku Ronbunshu. A (Journal of Structural Engineering. A) 59 (0) 91-103 2013

    Publisher: Japan Society of Civil Engineers

    DOI: 10.11532/structcivil.59A.91  

    More details Close

    The port facilities have been recognized as emergent supply transporting base in order to provide assistance for rehabilitation of disaster-affected areas. A system to evaluate the residual structural performance of the damaged facilities is required to judge whether the facility can be used or not. This paper deals with the residual structural performance of RC superstructure of open-type wharf damaged by earthquake. From the results of loading tests on the 1/4 scaled model, the failure process and the residual load carrying capacity of the RC superstructure after the earthquake are investigated.

  198. RELATION OF PHASE COMPOSITION OF CEMENT HYDRATES WITH SUPPLEMENTARY CEMENTITIOUS MATERIALS TO THE SUPPRESSING EFFECT ON ASR EXPANSION

    KAWABATA Yuichiro, YAMADA Kazuo, MATSUSHITA Hiromichi

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 69 (4) 402-420 2013

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-6567

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     This paper discusses the suppressing mechanism of supplementary cementitious materials (SCM) for expansion by alkali-silica reaction from the viewpoint of phase composition of cement hydrates. Hydration process and phase composition of hydrated cement paste were analyzed by using combined XRD/Rietveld analysis and chemical analysis. Suppressing effect of SCM was evaluated by mortar bars with 1.2% alkali and 40°C. Additionally, hydroxide ion concentration in pore solution was estimated based on the chemical composition of C-S-H gel. As the results, incorporating SCM contributed to the reduced Ca/Si ratio of C-S-H gel. The suppressing effect of SCM was correlated with the hydroxide ion concentration. These results strongly suggest that the mechanism of SCM for suppressing ASR expansion can be attributed to the reduction in hydroxide ion concentration in pore solution.

  199. 既設防波堤ケーソンの側壁補強工法の実験的研究

    水谷征治, 佐野清史, 松林卓, 岩波光保, 川端雄一郎

    コンクリート構造物の補修,補強,アップグレード論文報告集 12 389-394 2012/11/02

    ISSN: 1346-7492

  200. DEVELOPMENT OF PREVENTIVE REINFORCEMENT METHOD FOR EXISTING BREAKWATER CAISSONS

    松林卓, 岩波光保, 水谷征治, 安井利彰, 川端雄一郎, 森田浩史

    前田建設技術研究所報(CD-ROM) 53 ROMBUNNO.KISETSUBOUHATEIKESON 2012/10/01

    ISSN: 2423-9194

  201. UHP‐SHCCの巻立てによる鋼管杭の補強効果に関する実験的検討

    加藤絵万, 川端雄一郎, 岩波光保, 網野貴彦, 田中亮一, 国枝稔

    土木学会年次学術講演会講演概要集(CD-ROM) 67th ROMBUNNO.V-207 2012/08/01

  202. 温度や水分の変動が鉄筋の自然電位に及ぼす影響

    原田健二, 下村匠, 西田孝弘, 岩波光保, 加藤絵万, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 67th ROMBUNNO.V-008 2012/08/01

  203. 中詰材の改良による既設防波堤ケーソンの補強メカニズムに関する実験的検討

    岩波光保, 川端雄一郎, 松林卓, 安井利彰, 水谷征治, 佐野清史

    土木学会年次学術講演会講演概要集(CD-ROM) 67th ROMBUNNO.VI-105 2012/08/01

  204. 中詰材の改良厚さが既設防波堤ケーソンの耐衝撃補強効果に及ぼす影響

    森田浩史, 末岡英二, 松林卓, 安井利彰, 岩波光保, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 67th ROMBUNNO.VI-111 2012/08/01

  205. 第14回アルカリ骨材反応に関する国際会議(14^<th> ICAAR)の参加報告

    川端 雄一郎

    コンクリート工学 = Concrete journal 50 (8) 720-721 2012/08/01

    Publisher: 公益社団法人 日本コンクリート工学会

    DOI: 10.3151/coj.50.720  

    ISSN: 0387-1061

  206. An Attitude Survey of Concrete Engineers on Diagnosis of ASR-affected Concrete Structures-First-year Activity of JCI-TC 115 FS “Technical Committee on Diagnosis of ASR-affected Structures”-

    川端雄一郎, 山田一夫, 古賀裕久, 久保善司

    コンクリート工学 50 (7) 593-600 2012/07/01

    DOI: 10.3151/coj.50.593  

    ISSN: 0387-1061

  207. An Attitude Survey of Concrete Engineers on Diagnosis of ASR-affected Concrete Structures : First-year Activity of JCI-TC 115 FS "Technical Committee on Diagnosis of ASR-affected Structures"

    KAWABATA Y, YAMADA K, KOGA H, KUBO Y

    Concrete Journal 50 (7) 593-600 2012/07/01

    Publisher: Japan Concrete Institute

    ISSN: 0387-1061

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    This paper reports the first-year activity of JCI-TC 115 FS &amp;ldquo;Research Committee on Diagnosis of ASR-affected Structures&amp;rdquo;. An attitude survey was carried out in order to investigate the recognition of concrete engineers in regard to current preventive measures and diagnosis of ASR-affected structures. From the results, more than half of respondents recognized that it is required to establish the preventive measures appropriate for priority of the structure. The results also indicated that the preventive measures should be established by considering the balances between risk and cost.

  208. Development of Evaluation Method for Functional Performance of Mooring Facilities

    加藤絵万, 川端雄一郎, 岩波光保

    港湾空港技術研究所報告 51 (1) 55-57,59-80 2012/06

    ISSN: 1346-7832

  209. Development of Evaluation Method for Functional Performance of Mooring Facilities

    加藤 絵万, 川端 雄一郎, 岩波 光保

    港湾空港技術研究所報告 51 (1) 55-80 2012/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7832

  210. コンクリート内部の鉄筋腐食によるひび割れの検知に対する比抵抗モニタリングの適用可能性検討

    西田孝弘, 岩波光保, 川端雄一郎

    セメント技術大会講演要旨(CD-ROM) 66th ROMBUNNO.1303 2012/04/30

  211. 繰返し衝撃荷重を受ける鉄筋コンクリート版の押抜きせん断抵抗性能評価に関する実験的研究

    松林卓, 岩波光保, 川端雄一郎, 横田弘

    構造工学論文集 A(CD-ROM) 58 ROMBUNNO.15-1-980 2012/03/31

    Publisher: Japan Society of Civil Engineers

    DOI: 10.11532/structcivil.58A.967  

    ISSN: 1881-6614

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    Structural behavior and residual structural capacity of 2-way reinforce concrete (RC) slabs against punching shear failure were investigated through static loading tests after falling-weight impact loading tests. It was found that punching shear capacity of RC slabs damaged by repeated impact loads slightly decreases compared with non-damaged slabs just before the occurrence of punching shear crack. It was also found that punching shear capacity rapidly declines after formation of cracks due to punching shear at the bottom surface of the slabs. Based on the test results, the method to evaluate punching shear resistance of RC slabs subjected to repeated impact loads was proposed. Furthermore, the applicability of the proposed method to 1-way slab was examined.

  212. Study on Effect of Mixing Condition on Mechanical Properties of Mixture of Dredged Soil and Steel Slag

    平井壮, 水谷崇亮, 菊池喜昭, 菊池喜昭, 川端雄一郎

    港湾空港技術研究所報告 51 (3) 2012

    ISSN: 1346-7832

  213. Fundamental experiment on impact resistance of Ultra High Performance Strain Hardening Cement Composites (UHP-SHCC)

    加藤絵万, 川端雄一郎, 西田孝弘, 岩波光保

    生産研究 64 (4) 591-595 (J-STAGE) 2012

    DOI: 10.11188/seisankenkyu.64.591  

    ISSN: 0037-105X

  214. DEVELOPMENT OF EVALUATION METHOD FOR FUNCTIONAL PERFORMANCE OF BERTHING FACILITIES

    加藤絵万, 川端雄一郎, 岩波光保

    土木学会論文集 F4(建設マネジメント)(Web) 68 (3) 220-233 (J-STAGE) 2012

    DOI: 10.2208/jscejcm.68.220  

    ISSN: 2185-6605

  215. DEVELOPMENT OF REINFORCEMENT METHOD FOR BREAKWATER CAISSONS AGAINST REPEATED IMPACT LOADS

    松林卓, 森田浩史, 岩波光保, 安井利彰, 水谷征治, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 68 (2) I.336-I.341 (J-STAGE) 2012

    DOI: 10.2208/jscejoe.68.I_336  

    ISSN: 2185-4688

  216. SOME CONSIDERATIONS ON PREDICTION OF DETERIORATION PROCESS BASED ON INSPECTION RESULTS FROM COASTAL PROTECTION FACILITIES

    岩波光保, 西田孝弘, 加藤絵万, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 68 (2) I.510-I.515 (J-STAGE) 2012

    DOI: 10.2208/jscejoe.68.I_510  

    ISSN: 2185-4688

  217. DEVELOPMENT OF PREVENTIVE REINFORCEMENT METHOD FOR EXISTING BREAKWATER CAISSONS

    松林 卓, 安井 利彰, 岩波 光保, 川端 雄一郎, 水谷 征治, 森田 浩史

    前田建設技術研究所報 Maeda Corporation report of Technical Research Institute 53 2012

    Publisher: 前田建設工業

    ISSN: 2423-9194

  218. SOME CONSIDERATIONS ON PREDICTION OF DETERIORATION PROCESS BASED ON INSPECTION RESULTS FROM COASTAL PROTECTION FACILITIES

    IWANAMI Mitsuyasu, NISHIDA Takahiro, KATO Ema, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 68 (2) I_510-I_515 2012

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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    &amp;nbsp;In this paper, the deterioration process of coastal protection facilities was investigated using inspection data obtained according to &quot;Manual on Maintenance of Coastal Protection Facility for Life Cycle Management&quot;. Utilizing the data, transition rates, which are considered as deterioration speed of facilities, were calcurated by Markovian chain model. As a result, it was found that the facilities which have a high transition rate exists in certain ratio regardless of type of facility or construction site. As future tasks, it is necessary to make a database of facilities regarding construction year, structural type and record of inspection or repair, and revise the manual from the viewpoints of inspection items, evaluation method, classification of degree of soundness, and deterioration prediction.

  219. DEVELOPMENT OF REINFORCEMENT METHOD FOR BREAKWATER CAISSONS AGAINST REPEATED IMPACT LOADS

    MATSUBAYASHI Taku, MORITA Kouji, IWANAMI Mitsuyasu, YASUI Toshiaki, MIZUTANI Seiji, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 68 (2) I_336-I_341 2012

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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    &amp;nbsp;In breakwater caissons covered with concrete blocks, repeated impact loads induced by collision of concrete blocks may cause localized failure of the wall. Generally, damaged walls are repaired after the localized failure is observed. On the other hand, a preventive reinforcement method for localized failure of caisson walls has not been established. In this study, an efficient and effective method of preventive reinforcement for caisson walls against repeated impact forces by using jet-grouting was proposed. The effect of reinforcement was evaluated by impact loading tests on models of caisson walls. The laboratory test results showed that the proposed reinforcing method is promising to enhance the resistance of caisson walls against repeated impact loads.

  220. Experimental study on evaluation of punching shear resistance of RC slabs subjected to repeated impact loads

    Matsubayashi Taku, Iwanami Mitsuyasu, Kawabata Yuichiro, Yokota Hiroshi

    Kozo Kogaku Ronbunshu. A (Journal of Structural Engineering. A) 58 (0) 967-980 2012

    Publisher: Japan Society of Civil Engineers

    DOI: 10.11532/structcivil.58A.967  

    ISSN: 1881-820X

    More details Close

    Structural behavior and residual structural capacity of 2-way reinforce concrete (RC) slabs against punching shear failure were investigated through static loading tests after falling-weight impact loading tests. It was found that punching shear capacity of RC slabs damaged by repeated impact loads slightly decreases compared with non-damaged slabs just before the occurrence of punching shear crack. It was also found that punching shear capacity rapidly declines after formation of cracks due to punching shear at the bottom surface of the slabs. Based on the test results, the method to evaluate punching shear resistance of RC slabs subjected to repeated impact loads was proposed. Furthermore, the applicability of the proposed method to 1-way slab was examined.

  221. DEVELOPMENT OF EVALUATION METHOD FOR FUNCTIONAL PERFORMANCE OF BERTHING FACILITIES

    KATO Ema, KAWABATA Yuichiro, IWANAMI Mitsuyasu

    Journal of Japan Society of Civil Engineers, Ser. F4 (Construction and Management) 68 (3) 220-233 2012

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-6605

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    &amp;nbsp;Non-structural components of berthing facility such as yard apron and ancillaries are important equipment for ensuring safe and smooth operation in the facility. They often suffer deterioration and deformation under severe environmental and usage conditions, however, quantitative evaluation method of decline in their functional performance has not been developed to date. The decline in functional performance of ancillaries would consequently become one of main causes of decrease in safety and serviceability of the facility. This paper reports the results of the factual investigation on the decline in functional performance of berthing facilities with focusing on deterioration and/or deformation observed in face-line of wharf, yard apron and ancillaries, such as bollard and fender. The problems for developing quantitative evaluation method of functional performance from the viewpoint of safe and smooth operation in the facility were made clear from the investigated results. Applying the sensory evaluation technique, the influence degree on functional performance and the relationship between deterioration grades of each member and functional performance were evaluated statistically. Finally, an evaluation method of functional performance was developed for achieving the strategic maintenance of berthing facility.

  222. Fundamental experiment on impact resistance of Ultra High Performance Strain Hardening Cement Composites (UHP-SHCC)

    KATO Ema, KAWABATA Yuichiro, NISHIDA Takahiro, IWANAMI Mitsuyasu

    SEISAN KENKYU 64 (4) 591-595 2012

    Publisher: Institute of Industrial Science The University of Tokyo

    ISSN: 0037-105X

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    Steel pipe piles of open-type wharf are generally located in severe corrosion environment. To keep the structural performance of steel pipe piles, corrosion protective coating system is generally applied to the piles located in splash and tidal zone. The authors have tried to develop the new protective coating system which has high durability and impact-resistant performance using Ultra High Performance Strain Hardening Cementations Composites (UHP-SHCC). In this study, the influences of loading speeds and fiber mixing rates on the impact resistance of UHP-SHCC were experimentally investigated.[This abstract is not included in the PDF]

  223. OS11F019 High Speed Full-field Strain Measurement of RC Member Subjected to Dynamic Load

    Kawabata Yuichiro, Iwanami Mitsuyasu, Kato Ema, Goda Hiroki

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011 (10) "OS11F019-1"-"OS11F019-7" 2011/09/19

    Publisher: The Japan Society of Mechanical Engineers

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    Reinforced concrete (RC) structures would be subjected to accidental huge loads infrequently. In port facilities, accidental loads such as earthquake, collision of ships, tsunami attack incidentally to RC structures, causing collapse of structural members. It is required to develop the design method of RC structure against such accidental impact loads. The process of shear failure which is one of the failure patterns of RC structures has not been fully understood because of lack of data by experiments or numerical analysis. As the shear failure of RC member shows localized damage, it is required to make clear the strain distribution and its time-dependency under dynamic loads. Conventional technology such as strain gauge, however, is difficult to measure strain distribution at high resolution. This study reports the strain distribution and its time-dependency of RC member under dynamic loads. The dynamic loading test on RC beams was conducted and monitored with high-speed camera. The Digital Image Correlation (DIC) was applied to the obtained image, and the strain distribution was calculated by rosette analysis. As a result, strain distribution and its time-dependency of RC member under dynamic loads could be obtained by DIC analysis. It could be concluded that DIC analysis with high-speed camera would be a promising tool to track dynamic change in strain distribution of RC member.

  224. Residual Punching Shear Capacity of RC Slab Damaged by Repeated Impact Loads

    川端雄一郎, 岩波光保, 松林卓

    港湾空港技術研究所報告 50 (3) 43-45,47-64 2011/09

    ISSN: 1346-7832

  225. Residual punching shear capacity of RC slab damaged by repeated impact loads

    川端 雄一郎, 岩波 光保, 松林 卓

    Report of the Port and Airport Research Institute 50 (3) 43-64 2011/09

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7832

  226. デジタル画像相関法による応力解放法のASR劣化コンクリートへの適用

    合田寛基, 川端雄一郎, 内野正和, 岩波光保, 日比野誠

    日本実験力学会講演論文集 (11) 175-180 2011/08/30

    Publisher: 日本実験力学会

    ISSN: 1346-4922

  227. 海生生物の付着によるコンクリートへの塩化物イオンの長期的な侵入抑制効果の検証

    内田康平, 下村匠, 岩波光保, 加藤絵万, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 66th ROMBUNNO.V-224 2011/08/05

  228. 光学的全視野非接触計測によるASR膨張を生じたコンクリートのひずみ解放挙動の評価

    合田寛基, 日比野誠, 川端雄一郎, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 66th ROMBUNNO.V-542 2011/08/05

  229. 岩石学的観察に基づくASRによる各種反応性骨材の損傷形態と損傷過程の評価

    川端雄一郎, 広野真一, 岩波光保, 加藤絵万

    コンクリート工学年次論文集(CD-ROM) 33 ROMBUNNO.1166 2011/06/15

    ISSN: 2424-0281

  230. セメント系材料の自己治癒技術の体系化研究専門委員会報告書

    五十嵐心一, 国枝稔, 西脇智哉, 安台浩, 稲田裕, 今本啓一, 小田部裕一, 川端雄一郎, 閑田徹志, 小林薫, 権代由範, 佐川孝広, 谷口円, 樋口隆行, 人見尚, 細田暁, 丸山一平, 吉田晴亮, 渡辺健, 佐藤良恵, PAREEK Sanjay, 全振煥

    日本コンクリート工学会論文集 JCI-C79 1(1)-1(2),1-153 2011/06/09

  231. Properties of Concrete with High Volume Slag Fine Aggregate

    川端雄一郎, 岩波光保, 加藤絵万

    港湾空港技術研究所資料 (1233) 2-23 2011/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  232. 鉄筋コンクリート構造物の設計システム―Back to the Future―

    渡辺忠朋, 斉藤成彦, 塩畑英俊, 谷村幸裕, 齋藤隆, 笹谷輝勝, 滝本和志, 平野勝識, 渡辺健, 渡辺伸和, 石澤友亨, 市波克洋, 井上晋, 入江正明, 尹元彪, 内田裕市, 奥井義昭, 加藤隆, 金子正之, 上原子晶久, 川端雄一郎, 木野淳一, 島弘, 下村匠, 内藤英樹, 中島章典, 中野雅章, 西崎到, 濱田譲, 古本吉倫, 横田弘, 青戸拡起, 小川晃, 柏原茂, 小林竜太, 斉藤修一, 土屋智史, 長井宏平, 服部尚道, 牧剛史

    コンクリート技術シリーズ (95) 223P 2011/05/25

  233. 見えないものを可視化する 記事4 さまざまなデバイスによる可視化 2)見えないひび割れを可視化する

    川端雄一郎, XU Chao‐Nan

    土木学会誌 96 (2) 28-29 2011/02/15

    ISSN: 0021-468X

  234. 見えないひび割れを可視化する

    川端 雄一郎, 徐 超男

    土木學會誌 96 (2) 28-29 2011/02/15

    ISSN: 0021-468X

  235. Probabilistic approach for structural performance evaluation of RC structures damaged by chloride attack

    加藤絵万, 川端雄一郎, 岩波光保, 横田弘

    生産研究 63 (4) 411-414 (J-STAGE)-414 2011

    Publisher: Institute of Industrial Science The University of Tokyo

    DOI: 10.11188/seisankenkyu.63.411  

    ISSN: 0037-105X

    More details Close

    &nbsp;&nbsp;&nbsp; RC slabs extracted from an open-type wharf were tested in order to evaluate the relationship between visually judged deterioration grades and load carrying capacities. Based on the statistical analysis on the relationship between deterioration grades and load carrying capacities, the probabilistic evaluation method of the load carrying capacities of RC members was proposed as quantitative evaluation method of residual structural performance of existing port RC structures. [This abstract is not included in the PDF]<br>

  236. PROPOSAL OF PRIORITIZATION METHODS FOR REPAIR OF OPEN-TYPE PIER DECK BASED ON RESIDUAL PERFORMANCE EVALUATION

    岩波光保, 加藤絵万, 川端雄一郎

    土木学会論文集 B3(海洋開発)(Web) 67 (2) I.661-I.666 (J-STAGE) 2011

    DOI: 10.2208/jscejoe.67.I_661  

    ISSN: 2185-4688

  237. FACTUAL INVESTIGATION ON DECLINE IN FUNCTIONAL PERFORMANCE OF MOORING FACILITIES

    加藤絵万, 川端雄一郎, 岩波光保

    土木学会論文集 B3(海洋開発)(Web) 67 (2) I.655-I.660 (J-STAGE) 2011

    DOI: 10.2208/jscejoe.67.I_655  

    ISSN: 2185-4688

  238. APPLICABILITY OF CONCRETE WITH HIGH VOLUME OF SLAG FINE AGGREGATE TO PORT CONCRETE STRUCTURES

    川端雄一郎, 岩波光保, 加藤絵万

    土木学会論文集 B3(海洋開発)(Web) 67 (2) I.400-I.405 (J-STAGE) 2011

    DOI: 10.2208/jscejoe.67.I_400  

    ISSN: 2185-4688

  239. FUNDAMENTAL STUDY ON CRACK DETECTION OF CONCRETE WITH MECHANOLUMINESCENT SENSOR UNDER DARK-FIELD

    川端雄一郎, 小野大輔, LI Chenshu, 川崎悦子, 岩波光保, 加藤絵万, 上野直広, XU Chao-Nan, XU Chao-Nan

    土木学会論文集 E2(材料・コンクリート構造)(Web) 67 (3) 430-435 2011

    Publisher: Japan Society of Civil Engineers

    DOI: 10.2208/jscejmcs.67.430  

    ISSN: 2185-6567

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    &nbsp;This study reports the applicability of mechanoluminescent (ML) sensor to crack detection of concrete under dark-field. ML sensor could emit a visible light when the crack formed in concrete under dark-field. There was a linear relationship between the time-integra ted value of ML intensity and the energy required for the crack formation and propagation, which wa s estimated by load-CMOD curve obtained from bending tests on concrete beams. Based on fracture mechanics of concrete, the mechanism of luminescent of ML sensor was examined.

  240. PROBABILISTIC APPROACH FOR STRUCTURAL PERFORMANCE EVALUATION OF PORT RC STRUCTURE

    加藤絵万, 川端雄一郎, 岩波光保, 横田弘

    土木学会論文集 E2(材料・コンクリート構造)(Web) 67 (1) 150-159 2011

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-6567

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    &amp;nbsp;The total of 40 RC slabs extracted fr om existing port structures was tested in order to evaluate the relationship between visually judged deterioration grades and load carrying capacities. Wide variations were observed in the relati onship in each deterioration gr ade, however, the load carry ing capacity tended to be smaller than the design expectations when the symptom of deterioration appeared on the surface of concrete members. Moreover, the relationship was greatly influenced by localized deterioration and its position in the member.&lt;br&gt;&amp;nbsp;Based on the statistical analysis on the relationship between deterioration grades and load carrying capacities, the probabilistic evaluati on methods of the load carrying capacities of RC slabs and whole RC members in an open-type wharf were proposed as qu antitative evaluation methods of residual structural performance of existing port RC structures.

  241. A STUDY ON DEF-RELATED EXPANSION IN HEAT-CURED CONCRETE

    川端雄一郎, 松下博通, 松下博通

    土木学会論文集 E2(材料・コンクリート構造)(Web) 67 (4) 549-563 2011

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-6567

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    &amp;nbsp;This paper reports the requirements for deleterious expansion due to delayed ettringite formation (DEF) based on field experience. In recent years, the delete rious expansion of concrete have been reported. The concrete have been characterized by expansion and cracking after several years of service in environments exposed in wet conditions. In many cases, the concrete consists of white cement, limestone and copper slag and it has been manufactured at elevated temperatures for early shipment. From detailed analysis, it was made clear that the cause of deleterious expansion was DEF. The gaps which are featured in DEF-damaged concrete were observed around limest one aggregate. There was a possibility that use of limestone aggregate affects DEF-related expansion while the condition of steam curing was the most effective factor for DEF-related expansion. Based on experimental data, the mechanism of DEF-related expansion and the methodology of diagnosing DEF-deterior ated concrete structures were discussed in this paper.

  242. APPLICABILITY OF CONCRETE WITH HIGH VOLUME OF SLAG FINE AGGREGATE TO PORT CONCRETE STRUCTURES

    KAWABATA Yuichiro, IWANAMI Mitsuyasu, KATO Ema

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67 (2) I_400-I_405 2011

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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    &amp;nbsp;&amp;nbsp;It is required to apply concrete with high volume slag fine aggregate without special quality improvement (HVSA concrete) to appropriate concrete structures from the viewpoint of benefiticial utilization of industrial by-products. This paper reports the mechanical properties and durability of HVSA concrete. As a result, the effect of bleeding on the mechanical properties of HVSA concrete was small when the bleeding content was less than 0.5cm&lt;sup&gt;3&lt;/sup&gt;/cm&lt;sup&gt;2&lt;/sup&gt;. It was confirmed that the long-term durability of HVSA concrete was almost the same as normal concrete. The results implied that port concrete structures can be produced with HVSA concrete when the bleeding of HVSA concrete is less than 0.5cm&lt;sup&gt;3&lt;/sup&gt;/cm&lt;sup&gt;2&lt;/sup&gt;.

  243. FACTUAL INVESTIGATION ON DECLINE IN FUNCTIONAL PERFORMANCE OF MOORING FACILITIES

    KATO Ema, KAWABATA Yuichiro, IWANAMI Mitsuyasu

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67 (2) I_655-I_660 2011

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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    &amp;nbsp;&amp;nbsp;Non-structural components of mooring facility such as yard apron and ancillaries are important equipment for ensuring safe and smooth operation in the facility. They often suffer deterioration and deformation under severe environmental and usage conditions, however, quantitative evaluation method of decline in their functional performance has not been developed to date. The decline in functional performance of ancillaries would consequently become one of main causes of decrease in safe and serviceability of the mooring facility.&lt;br&gt;&amp;nbsp;&amp;nbsp;This paper reports the results of the factual investigation on the decline in functional performance of mooring facilities in Japanese ports with focusing on deterioration and/or deformation observed in face-line of wharf, yard apron and ancillaries, such as bollard and fender. The problems for developing quantitative evaluation method of functional performance from the viewpoint of safe and smooth operation in the facility were made clear from the investigated results.

  244. PROPOSAL OF PRIORITIZATION METHODS FOR REPAIR OF OPEN-TYPE PIER DECK BASED ON RESIDUAL PERFORMANCE EVALUATION

    IWANAMI Mitsuyasu, KATO Ema, KAWABATA Yuichiro

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67 (2) I_661-I_666 2011

    Publisher: Japan Society of Civil Engineers

    ISSN: 2185-4688

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    &amp;nbsp;&amp;nbsp;The authors were proposed the evaluation method of residual performance of reinforced concrete (RC) decks of open-type piers damaged by rebar corrosion based on results of visual inspection of surface appearance of the structures. In the method, the deterioration degrees judged by the visual inspection were analyzed by the extreme value theory. In this paper, the prioritization method for repair of RC decks of open-type piers was examined, in which the residual performance obtained from the proposed method was utilized as an evaluation index of structural performance of RC decks. Total of 10 RC decks which were in service for more than 30 years was examined, and the expected minimum value of load bearing capacity of RC decks was probabilistically estimated, facility by facility, and block by block. Based on the estimated residual performance of RC decks, the priority of repair work to the deck was investigated for strategic maintenance.

  245. Probabilistic approach for structural performance evaluation of RC structures damaged by chloride attack

    KATO Ema, KAWABATA Yuichiro, IWANAMI Mitsuyasu, YOKOTA Hiroshi

    SEISAN KENKYU 63 (4) 411-414 2011

    Publisher: Institute of Industrial Science The University of Tokyo

    DOI: 10.11188/seisankenkyu.63.411  

    ISSN: 0037-105X

    More details Close

    &amp;nbsp;&amp;nbsp;&amp;nbsp; RC slabs extracted from an open-type wharf were tested in order to evaluate the relationship between visually judged deterioration grades and load carrying capacities. Based on the statistical analysis on the relationship between deterioration grades and load carrying capacities, the probabilistic evaluation method of the load carrying capacities of RC members was proposed as quantitative evaluation method of residual structural performance of existing port RC structures. [This abstract is not included in the PDF]&lt;br&gt;

  246. Application of stress release method by Digital Image Correlation method to concrete units deteriorated by Alkali Silica Reaction

    合田 寛基, 川端 雄一郎, 内野 正和

    Proceedings of JSEM (11) 175-180 2011

    Publisher: 日本実験力学会

    ISSN: 1346-4922

  247. 海洋環境で著しく鋼材腐食を生じたRCはりの耐荷性能評価

    川端雄一郎, 加藤絵万, 岩波光保

    コンクリート構造物の補修,補強,アップグレード論文報告集 10 193-198 2010/10/29

    ISSN: 1346-7492

  248. EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOR OF RC SLABS SUBJECTED TO REPEATED IMPACT LOADS

    松林卓, 川端雄一郎, 岩波光保

    前田建設技術研究所報(CD-ROM) 51 ROMBUNNO.KURIKAESHISHOGEKIKAJUOKERU 2010/10/01

    ISSN: 2423-9194

  249. 応力発光材料を用いたコンクリートのひび割れ検出技術の開発

    小野大輔, 川端雄一郎, LI Chenshu, 川崎悦子, 上野直広, 岩波光保, XU Chao‐Nan

    日本実験力学会講演論文集 (10) 270-273 2010/08/17

    ISSN: 1346-4922

  250. 背面に砂層が存在する二辺支持鉄筋コンクリート版の繰返し衝撃実験

    松林卓, 岩波光保, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.I-268 2010/08/05

  251. 桟橋上部工コンクリートにおける鉄筋腐食モニタリング実証実験

    岩波光保, 加藤絵万, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-346 2010/08/05

  252. 高温蒸気養生を行ったモルタルのDEFによる長期膨張性状とその制御に関する研究

    濱田秀則, 佐川康貴, 池田隆徳, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-297 2010/08/05

  253. 暗視野下におけるコンクリートのひび割れ検出への応力発光センサの適用

    川端雄一郎, 徐超男, 小野大輔, 岩波光保, 李シンシュ, 上野直広, 加藤絵万

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-255-510 2010/08/05

  254. コンクリートのASR促進膨張試験結果にアルカリ溶脱が及ぼす影響

    井上祐一郎, 佐川康貴, 川端雄一郎, 山田一夫

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-273-546 2010/08/05

  255. 長期供用した桟橋上部工の確率論に基づく保有性能評価の試行

    加藤絵万, 川端雄一郎, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-325 2010/08/05

  256. 応力発光センサーを用いた鉄筋コンクリートの破壊予測の検討

    李シンシュ, 川端雄一郎, 徐超男, 小野大輔, 李承周, 岩波光保, 上野直広, つく井正義, 川崎悦子

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-256 2010/08/05

  257. 塩害により著しく劣化したRC桁の耐荷性状

    陸賢, 下村匠, 加藤絵万, 岩波光保, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 65th ROMBUNNO.V-195 2010/08/05

  258. Visualization of Cracking of Concrete using Mechanoluminescent Sensor

    小野大輔, 川端雄一郎, LI Chenshu, LI Chengzhou, 上野直広, 岩波光保, XU Chao-Nan, XU Chao-Nan

    可視化情報学会誌 30 (Suppl.1) 343-344 2010/07/01

    ISSN: 0916-4731

  259. 長期供用した港湾構造物の確率論的保有性能評価手法

    加藤絵万, 川端雄一郎, 岩波光保, 横田弘

    生産研究 62 (4) 335-337 2010/07/01

    DOI: 10.11188/seisankenkyu.62.335  

    ISSN: 0037-105X

  260. 銅スラグ細骨材を大量混合したコンクリートの施工性と品質変化に関する検討

    川端雄一郎, 岩波光保, 加藤絵万, 審良善和

    コンクリート工学年次論文集(CD-ROM) 32 ROMBUNNO.1249 2010/06/15

    ISSN: 2424-0281

  261. 繰返し衝撃荷重を受ける四辺支持鉄筋コンクリート版の押抜きせん断耐荷性能評価に関する実験的検討

    松林卓, 岩波光保, 川端雄一郎, 三浦紀明

    コンクリート工学年次論文集(CD-ROM) 32 ROMBUNNO.2120 2010/06/15

    ISSN: 2424-0281

  262. ペシマム現象を生じる骨材を用いたモルタルのフライアッシュによるASR抑制効果

    井上祐一郎, 濱田秀則, 川端雄一郎, 山田一夫

    コンクリート工学年次論文集(CD-ROM) 32 (1) ROMBUNNO.1151-958 2010/06/15

    ISSN: 2424-0281

  263. Structural Behavior of Reinforced Concrete Slabs Subjected to Repeated Impact Loads

    岩波光保, 松林卓, 川端雄一郎

    港湾空港技術研究所資料 (1216) 40P 2010/06

    ISSN: 1346-7840

  264. Structural behavior of reinforced concrete slabs subjected to repeated impact loads

    岩波 光保, 松林 卓, 川端 雄一郎

    Technical note of the Port and Airport Research Institute (1216) 2-38 2010/06

    Publisher: 港湾空港技術研究所

    ISSN: 1346-7840

  265. Probabilistic Approach for Structural Performance Evaluation of Port RC Structure

    加藤絵万, 川端雄一郎, 岩波光保

    港湾空港技術研究所資料 (1225) 483-490 2010

    ISSN: 1346-7840

  266. Probabilistic evaluation on structural performance of harbor structures

    KATO Ema, KAWABATA Yuichiro, IWANAMI Mitsuyasu, YOKOTA Hiroshi

    SEISAN KENKYU 62 (4) 335-337 2010

    Publisher: Institute of Industrial Science The University of Tokyo

    ISSN: 0037-105X

    More details Close

    In this paper, RC slabs extracted from an open-type wharf were tested in order to evaluate the relationship between visually judged deterioration grades and load carrying capacities. Based on the statistical analysis on the relationship between deterioration grades and load carrying capacities, the probabilistic evaluation method of the load carrying capacities of whole RC slabs in an open-type wharf was proposed as quantitative evaluation method of residual structural performance of existing port RC structures.[This abstract is not included in the PDF]

  267. Development of crack detection method of concrete using mechanoluminescent material

    小野 大輔, 川端 雄一郎, 李 シンシュ

    Proceedings of JSEM (10) 270-273 2010

    Publisher: 日本実験力学会

    ISSN: 1346-4922

  268. 高反応性骨材を用いたモルタルのペシマム現象とフライアッシュによるASR抑制効果

    井上祐一郎, 濱田秀則, 佐川康貴, 川端雄一郎, 山田一夫

    土木学会年次学術講演会講演概要集(CD-ROM) 64th (Disk 2) ROMBUNNO.V-102-202 2009/08/03

  269. 海洋環境に長期暴露された高性能軽量コンクリートの塩分浸透性状および材料分離の影響の評価

    西剛広, 岩崎英治, 川端雄一郎, 岩波光保

    土木学会年次学術講演会講演概要集(CD-ROM) 64th (Disk 2) ROMBUNNO.V-304 2009/08/03

  270. 骨材からのアルカリ溶出性状とASRによる膨張挙動の関係

    池田隆徳, 濱田秀則, 佐川康貴, 川端雄一郎, 山田一夫

    土木学会年次学術講演会講演概要集(CD-ROM) 64th (Disk 2) ROMBUNNO.V-098 2009/08/03

  271. 高性能軽量コンクリートの材料分離特性と海洋環境下における長期耐久性の評価

    川端雄一郎, 岩波光保, 加藤絵万, 横田弘

    コンクリート工学年次論文集(CD-ROM) 31 ROMBUNNO.1295 2009/06/15

    ISSN: 2424-0281

  272. フライアッシュ混和コンクリートのASRによる膨張挙動に関する研究

    西政好, 浜田秀則, 佐川康貴, 川端雄一郎

    コンクリート工学年次論文集(CD-ROM) 31 ROMBUNNO.1215 2009/06/15

    ISSN: 2424-0281

  273. Estimation of Carbonation and Chloride Penetration of Recycled Aggregate Concrete Focused on Pore Volume

    佐川康貴, 松下博通, 川端雄一郎

    コンクリート工学 47 (2) 21-29 2009/02/01

    DOI: 10.3151/coj.47.2_21  

    ISSN: 0387-1061

  274. Estimation of Carbonation and Chloride Penetration of Recycled Aggregate Concrete Focused on Pore Volume

    SAGAWA Y, MATSUSHITA H, KAWABATA Y

    Concrete Journal 47 (2) 21-29 2009/02/01

    Publisher: Japan Concrete Institute

    ISSN: 0387-1061

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    In this study, several accelerated durability tests were performed to clarify the speed of carbonation and chloride ion penetration of recycled aggregate concrete. When the recycled aggregate with high absorption and low density was used, durability of concrete was lowered. This trend was remarkable when recycled fine aggregate was used. As the results of experiments on mortar, the increase of pore volume in new cement paste matrix lowered durability, and mineral admixtures, such as fly ash and ground granulated blast-furnace slag, improved resistance to chloride penetration. Moreover, it was confirmed that durability of pretensioned spunconcrete poles made by centrifugal compaction didn&#039;t fall remarkably if strength of recycled concrete was at the same level as that of normal aggregate concrete.

  275. Long-term durability of super lightweight concrete under marine environment

    川端雄一郎, 岩波光保, 加藤絵万, 横田弘

    生産研究 61 (4) 669-672 (J-STAGE) 2009

    DOI: 10.11188/seisankenkyu.61.669  

    ISSN: 0037-105X

  276. Long-term durability of super lightweight concrete under marine environment

    KAWABATA Yuichiro, IWANAMI Mitsuyasu, KATO Ema, YOKOTA Hiroshi

    SEISAN KENKYU 61 (4) 669-672 2009

    Publisher: Institute of Industrial Science The University of Tokyo

    ISSN: 0037-105X

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    &amp;nbsp;&amp;nbsp;&amp;nbsp; &amp;nbsp;&amp;nbsp;&amp;nbsp;This paper reports the long-term durability of super lightweight aggregate (SLA) concrete in marine environment. In addition, the effect of segregation on the performance of SLA concrete was investigated. After 8-year exposure in marine environment, various tests and investigations were conducted. It was revealed that SLA concrete has enough compressive strength and Young&amp;rsquo;s modulus after the long-term exposure. The diffusion coefficient of chloride ion of SLA concrete was small because of its low water to cement ratio. Though the segregation slightly affects the performance of SLA concrete, it was verified that SLA concrete has high durability in marine environment. [This abstract is not included in the PDF]&lt;br&gt;

  277. 第13回アルカリ骨材反応に関する国際会議(ICAAR)の参加報告

    川端 雄一郎

    コンクリート工学 = Concrete journal 46 (10) 60-61 2008/10/01

    ISSN: 0387-1061

  278. 風化した安山岩骨材のアルカリシリカ反応性とその判定に関する考察

    川端雄一郎, 山田一夫, 松下博通, 浜田秀則, 池田隆徳

    土木学会年次学術講演会講演概要集(CD-ROM) 63rd (Disk 2) ROMBUNNO.5-083 2008/08/13

  279. 画像解析による再生モルタルの空隙量評価手法に関する検討

    村上英明, 浜田秀則, 佐川康貴, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 63rd (Disk 2) ROMBUNNO.5-388 2008/08/13

  280. 品質の異なるフライアッシュのASR抑制効果に関する研究

    西政好, 浜田秀則, 佐川康貴, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 63rd (Disk 2) ROMBUNNO.5-101 2008/08/13

  281. 再生モルタルの強度および空隙構造に及ぼす再生骨材の水分の影響

    村上英明, 佐川康貴, 川端雄一郎, 松下博通

    コンクリート工学年次論文集 30 (2) 397-402 2008/07/30

    ISSN: 1347-7560

  282. 高炉コンクリートの耐久性における養生敏感性

    伊代田岳史, 檀康弘, 川端雄一郎, 濱田秀則

    コンクリート工学年次論文集 30 (1) 111-116 2008/07/30

    ISSN: 1347-7560

  283. 風化度の異なる安山岩骨材のASR膨張挙動の評価

    川端雄一郎, 松下博通, 山田一夫, 林建佑

    コンクリート工学年次論文集 30 (1) 993-998 2008/07/30

    ISSN: 1347-7560

  284. 混和材による高温養生を行ったモルタルのDEF膨張の抑制効果

    池田隆徳, 川端雄一郎, 浜田秀則, 佐川康貴

    コンクリート工学年次論文集 30 (1) 135-1140 2008/07/30

    ISSN: 1347-7560

  285. Sensibility for curing condition and age on durability of blast-furnace slag cement concretes

    IYODA Takeshi, DAN Yasuhiro, KAWABATA Yuichiro, HAMADA Hidenori

    Proceedings of the Japan Concrete Institute 30 (1) 111-116 2008

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    コンクリート構造物が所要の強度・耐久性を保持するためには養生が必要であることは周知の事実である。しかし,養生に関する研究データの多くは圧縮強度に対する検討であり,耐久性についてはあまり論じられていない。近年の環境問題を考慮すれば,今後一層混合セメントの使用の増加が予測されることから,ここでは高炉セメントを使用したコンクリートにおける養生条件と耐久性の関係を実験的に整理した。その結果,高炉セメントコンクリートは普通セメントコンクリートと比べ養生に対して敏感であること,ならびに表層コンクリートへの養生の重要性について整理できた。

  286. Suppressing effect of mineral admixture on DEF-related expansion of heat-cured mortar

    IKEDA Takanori, KAWABATA Yuichiro, HAMADA Hidenori, SAGAWA Yasutaka

    Proceedings of the Japan Concrete Institute 30 (1) 135-140 2008

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究では,DEF(エトリンガイトの遅延生成)による膨張に対するフライアッシュ(FA)および高炉スラグ微粉末(BFS)の膨張抑制効果の検討を行った。DEF膨張を生じるためには,空隙水中のSO4}濃度が高いこと,および水酸化カルシウムが存在していることが必要であることを明らかにした。また,EAおよびBFSにはDEF膨張の抑制効果がみられ,これは,FA,BFSの反応やセメント量減少の物理的効果による空隙水のSO4}濃度の低下と水酸化カルシウムの低減によるものと推察された。

  287. Evaluation of alkali-silica reactivity and expansion behavior of andesite with various alteration

    KAWABATA Yuichiro, MATSUSHITA Hiromichi, YAMADA Kazuo, HAYASHI Kensuke

    Proceedings of the Japan Concrete Institute 30 (1) 993-998 2008

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究は同一砕石場から風化度の異なる安山岩骨材を採取し,各種試験によりアルカリシリカ反応(ASR)の特性(ASR反応性)を評価した。化学法では風化の進行に従ってアルカリ濃度減少量(Rc)が多く,溶解シリカ籔Sc)が少なくなった。また,Rc,Scの大きな安山岩骨材はべシマムを生じ,現行JISのモルタルバー法ではASR反応性を適切に検出できなかった。一方,飽和NaCl溶液に浸漬するデンマーク法や1mol/lのNaOHに浸漬するASTM C 1260に準拠した促進膨張試験では風化した安山岩骨材のASR反応性を適切に検出でき,これらの試験法はペシマム現象を生じる安山岩骨材のASR反応性についても検出可能と考えられた。

  288. Effect of water absorbed in recycled aggregate on strength and microstructure of mortar

    村上 英明, 佐川 康貴, 川端 雄一郎, 松下 博通

    Proceedings of the Japan Concrete Institute 30 (2) 397-402 2008

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究は再生モルタルにおける強度および空隙構造に及ぼす再生骨材中の水分の影響を評価するため,水分供給の異なる条件において養生した再生モルタルの強度発現性および空隙構造の形成挙動を検討した。封絨養生を行った場合,高吸水率の再生骨材は自己養生効果を示し,水中養生と同様の強度発現を示した。一方,再生骨材を使用することで脱型時には強度低下および空隙の粗大化が生じていた。これは,再生骨材表面に存在する凹凸部が捕捉した水分による影響と考えられた。すなわち,再生骨材中の水分には強度低下に寄与する表面凹凸部の水分と長期的な強度増進に寄与する水分があることを明らかにした。

  289. 岩石学的評価による安山岩骨材のASR反応性の評価

    松下博通, 今井亮, 濱田秀則, 佐川康貴, 川端雄一郎, 藤井亨

    九州大学中央分析センター報告 (25) 33-39 2007/12/31

    ISSN: 0916-0892

  290. 岩石学的評価に基づく各種促進養生試験における安山岩の膨張挙動解析

    川端雄一郎, 松下博通, 濱田秀則, 山田一夫

    土木学会年次学術講演会講演概要集(CD-ROM) 62nd (Disk 2) ROMBUNNO.5-456 2007/09/01

  291. ASR診断に基づく劣化損傷状況に及ぼす要因分析

    山本大介, 川端雄一郎, 松下博通, 山田一夫

    土木学会年次学術講演会講演概要集(CD-ROM) 62nd (Disk 2) ROMBUNNO.5-449 2007/09/01

  292. 高炉スラグ微粉末およびフライアッシュのDEF膨張抑制効果に関する研究

    池田隆徳, 川端雄一郎, 濱田秀則, 松下博通

    土木学会年次学術講演会講演概要集(CD-ROM) 62nd (Disk 2) ROMBUNNO.5-480 2007/09/01

  293. 再生細骨材の品質が細孔容積と強度の関係に及ぼす影響

    佐川康貴, 松下博通, 川端雄一郎

    コンクリート工学年次論文集 29 (2) 385-390 2007/07/30

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

  294. モルタルのDEF膨張に及ぼすセメント及び骨材種類の影響

    池田隆徳, 川端雄一郎, 松下博通, 濱田秀則

    コンクリート工学年次論文集 29 (1) 987-992 2007/07/30

    ISSN: 1347-7560

  295. 安山岩骨材の岩石学的評価とASR膨張挙動の解析

    川端雄一郎, 山田一夫, 松下博通, 濱田秀則

    コンクリート工学年次論文集 29 (1) 1221-1226 2007/07/30

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

  296. 細骨材代替として混和したフライアッシュのアルカリシリカ反応抑制効果に関する実験的検討

    川端雄一郎, 松下博通

    コンクリート工学論文集 18 (1) 67-77 2007/01/25

    Publisher: 日本コンクリート工学協会

    DOI: 10.3151/crt1990.18.1_67  

    ISSN: 1340-4733

  297. Experimental Study on Effect of Fly Ash Incorporated as the Part of Fine Aggregate on Expansion of Mortar due to ASR

    KAWABATA Yuichiro, MATSUSHITA Hiromichi

    Concrete research and technology, Japan Concrete Institute 18 (1) 67-77 2007/01/25

    Publisher: 日本コンクリート工学協会

    ISSN: 1340-4733

  298. EVALUATION OF CHARACTER OF FLY ASH RELATED TO SUPPRESSING EFFECT ON ALKALI-SILICA REACTION

    川端雄一郎, 松下博通

    土木学会論文集 E 63 (3) 379-395 (J-STAGE) 2007

    DOI: 10.2208/jsceje.63.379  

  299. PETROLOGICAL STUDY ON EVALUATION OF ALKALI-SILICA REACTIVITY AND EXPANSION ANALYSIS OF ANDESITE

    川端雄一郎, 山田一夫, 松下博通

    土木学会論文集 E 63 (4) 689-703 (J-STAGE) 2007

    DOI: 10.2208/jsceje.63.689  

  300. PETROLOGICAL STUDY ON EVALUATION OF ALKALI-SILICA REACTIVITY AND EXPANSION ANALYSIS OF ANDESITE

    KAWABATA Yuichiro, YAMADA Kazuo, MATSUSHITA Hiromichi

    Doboku Gakkai Ronbunshuu E 63 (4) 689-703 2007

    Publisher: Japan Society of Civil Engineers

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    Alkali silica reactivity of andesite has been considered relatively simple regardless of various mineral compositions. The reactivity is considered to be attributed to its volcanic glass and reactive silica such as cristobalite and trydimite. In this study, the reactivity of andesite was evaluated by various accelerating test. Glassy andesite without silica mineral was innocuous in saturated NaCl solution whereas it showed reactivity in JIS A 1145, JIS A 1146 and ASTM C 1260. This is attributed to linkages of mineral composition of andesite and composition of pore solution. The results indicated one possibility that glassy andesite is innocuous even in specific environment where alkalis are supplied from environments such as deicing salt and sea water.

  301. Experimental Study on Effect of Fly Ash Incorporated as the Part of Fine Aggregate on Expansion of Mortar due to ASR

    Kawabata Yuichiro, Matsushita Hiromichi

    Concrete Research and Technology 18 (1) 67-77 2007

    Publisher: Japan Concrete Institute

    ISSN: 1340-4733

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    This study reports the suppressing effect of fly ash incorporated as the part of fine aggregate on the expansion of mortar due to alkali-silica reaction (ASR). In this study, 3 types of fly ash were tested according to 2 types of accelerated mortar bar test. As a result, the larger the replacement ratio of fly ash became, the less the expansion of mortar. The effectiveness of fly ash on expansion due to ASR was different according to the chemical composition and particle size of fly ash. More quantities of fly ash are required in Danish method than JIS method to suppress expansion due to ASR. It was revealed that the suppressing effect of fly ash was affected by the contents of amorphous silica and calcium and the specific surface area of fly ash.

  302. EVALUATION OF CHARACTER OF FLY ASH RELATED TO SUPPRESSING EFFECT ON ALKALI-SILICA REACTION

    KAWABATA Yuichiro, MATSUSHITA Hiromichi

    Doboku Gakkai Ronbunshuu E 63 (3) 379-395 2007

    Publisher: Japan Society of Civil Engineers

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    The suppressing effect of fly ash on alkali-silica reaction (ASR) is different from the physical, chemical and mineralogical property of fly ash itself. This paper reports the important character of fly ash related to the suppressing effect on expansion of mortar due to ASR. The effectiveness of fly ash is affected by the specific surface area, amorphous silica, calcium content of fly ash and alkali content of cement. Fly ash containing high calcium content could not suppress expansion. In this study, a new index, using specific surface area, amorphous silica content in fly ash, alkali content of cement and fly ash volume per unit is proposed. This index was correlated with ASR expansion ratio of mortar incorporating fly ash.

  303. Effect of types of cement and aggregate on expansion of mortar due to delayed ettringite formation

    池田 隆徳, 川端 雄一郎, 松下 博通, 濱田 秀則

    Proceedings of the Japan Concrete Institute 29 (1) 987-992 2007

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究では,DEF(エトリンガイトの遅延生成)膨張に及ぼすセメント種類,骨材種類の影響について検討した。DEF膨張はSO_3添加量の増大に伴い大きくなること,また,膨張量はC_3A量,C_3S量等のセメントの組成によって変化することが分かった。さらに,石灰石骨材を使用した場合,膨張量が小さくなるが,セメントとの組合せによっては膨張量が最大となるSO_3添加量が存在することを明らかにした。この現象は石灰石の反応による水和反応への影響によるものと推察された。また,電子顕微鏡観察の結果から,膨張量が大きいほど骨材-ペースト界面に見られるギャップの幅が大きい傾向にあることを明らかにした。

  304. Petrographic examination of andesite and analysis of expansion due to alkali-silica reaction

    川端 雄一郎, 山田 一夫, 松下 博通, 濱田 秀則

    Proceedings of the Japan Concrete Institute 29 (1) 1221-1226 2007

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    種々の安山岩骨材について,岩石学的評価およびこれらの骨材を用いた促進養生試験によるモルタルの膨張量測定を行った。その結果,シリカ鉱物を含まないガラス質安山岩は化学法とJIS A 1146に準拠したモルタルバー法において「無害でない」と判定されたが,温度50℃の飽和NaCl溶液浸漬による促進試験では膨張を示さなかった。この原因について,モルタルの液相のpHおよびpHの異なるアルカリ溶液中における各鉱物の溶解挙動から考察した。その結果,ガラス質安山岩は総量規制を遵守すれば,凍結防止剤のような外部からのアルカリでは膨張しない可能性があることが明らかとなった

  305. Influence of quality of recycled aggregate on relation between pore volume and strength of mortar

    SAGAWA Yasutaka, MATSUSHITA Hiromichi, KAWABATA Yuichiro

    Proceedings of the Japan Concrete Institute 29 (2) 385-390 2007

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    再生骨材コンクリートおよびモルタルの強度を表す指標には,単位セメント量Cと単位水量に細骨材の吸水量を加えたTWとの比(C/TW)が有効であるとされている。しかし,コンクリートおよびモルタルの強度が骨材強度に依存する低水セメント比では,強度が頭打ちとなり,CITWのみでは十分に評価が行えない可能性がある。本研究は,再生細骨材およびそれを取り巻く新セメントペーストの細孔容積を用い,再生細骨材を使用したモルタルの強度を評価した。その結果,新セメントペーストに存在する細孔容積が再生細骨材の細孔容積を下回った場合に,再生モルタルの強度が頭打ちとなることを明らかにした。

  306. 真相解迷??

    川端 雄一郎

    コンクリート工学 = Concrete journal 44 (11) 74-74 2006/11/01

    ISSN: 0387-1061

  307. フライアッシュを外割混入したモルタル及びコンクリートの塩分浸透抵抗性に関する検討

    相馬良太, 松下博通, 濱田秀則, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 61st (Disk 2) ROMBUNNO.5-174 2006/09/01

  308. 御影石を模擬したコンクリート二次製品の異常膨張現象の特徴と再現試験

    浜田秀則, 川端雄一郎, 松下博通, 佐川康貴

    土木学会年次学術講演会講演概要集(CD-ROM) 61st (Disk 2) ROMBUNNO.5-306 2006/09/01

  309. 付着ペーストの細孔容積による再生細骨材使用モルタルの強度の評価

    石橋昌史, 松下博通, 佐川康貴, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 61st (Disk 2) ROMBUNNO.5-416 2006/09/01

  310. フライアッシュを外割混入したモルタルの強度および中性化性状に関する検討

    濱本真吾, 松下博通, 浜田秀則, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 61st (Disk 2) ROMBUNNO.5-321 2006/09/01

  311. フライアッシュのASR抑制機構に関する一考察

    川端雄一郎, 松下博通, 濱田秀則, 佐川康貴, 三宅淳一

    土木学会年次学術講演会講演概要集(CD-ROM) 61st (Disk 2) ROMBUNNO.5-066 2006/09/01

  312. 既設構造物におけるASR診断手法及び対策時期の判定に関する検討

    川端雄一郎, 松下博通, 猪野和歌人, 山田一夫

    コンクリート工学年次論文集 28 (1) 2063-2068 2006/07/30

    ISSN: 1347-7560

  313. 異なるアルカリ環境下におけるフライアッシュのASR抑制効果

    相馬良太, 川端雄一郎, 松下博通

    コンクリート工学年次論文集 28 (1) 833-838 2006/07/30

    ISSN: 1347-7560

  314. 再生細骨材を用いたモルタルの細孔構造および強度・中性化に関する研究

    石橋昌史, 松下博通, 佐川康貴, 川端雄一郎

    コンクリート工学年次論文集 28 (1) 1487-1492 2006/07/30

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

  315. THE EFFECT OF MICROSTRUCTURE ON STRENGTH AND DURABILITY OF MORTAR INCORPORATING RECYCLED FINE AGGREGATE

    MATSUSHITA Hiromichi, SAGAWA Yasutaka, KAWABATA Yuichiro

    土木学会論文集 62 (1) 230-242 2006/04/20

    Publisher: 土木学会

    DOI: 10.2208/jsceje.62.230  

    ISSN: 1880-6066

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    本研究は再生細骨材を使用したモルタルの強度及び耐久性の低下機構について細孔構造の観点から考察したものである.再生細骨材を使用したモルタルはセメントペースト部の細孔構造がポーラスになり,強度や耐久性が低下する.これは骨材から水分が滲出することが原因と考えられる.特に 50 nm~2 μm の細孔容積と強度や中性化速度係数及び塩化物イオンの見かけの拡散係数に良い相関関係が確認できる.また,強度及び耐久性の改善を目的として各種混和材を混入した.その結果,混和材を混入することにより再生モルタルの強度及び塩分浸透抵抗性が改善されることを明らかにした.また,混和材を混入することにより中性化抵抗性は低下するが,本研究において予測式を提案し,それにより対応可能であることを示した.This study reports the decrease of strength and deterioration mechanism of mortar incorporationg recycled fine aggregate from the viewpoint of porosity. Pore volume of cement composites with recycled aggregate was large. Thus, strength of mortar incorporationg recycled aggregate decreased. Pore volume of 50 nm~2 μm affected strength, carbonation speed and diffusion coefficient of chloride ion. In order to improve the strength and durability of recycled mortar, in this study mineral admixtures such as ground granulated blast-furnace slag and fly ash were used. Strength and diffusion coefficient of chloride ion of mortar were improved, but carbonation speed was larger than that of normal mortar. Carbonation speed was evaluated by total water-effective binder ratio.

  316. THE EFFECT OF MICROSTRUCTURE ON STRENGTH AND DURABILITY OF MORTAR INCORPORATING RECYCLED FINE AGGREGATE

    MATSUSHITA Hiromichi, SAGAWA Yasutaka, KAWABATA Yuichiro

    Doboku Gakkai Ronbunshuu E 62 (1) 230-242 2006

    Publisher: Japan Society of Civil Engineers

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    This study reports the decrease of strength and deterioration mechanism of mortar incorporationg recycled fine aggregate from the viewpoint of porosity. Pore volume of cement composites with recycled aggregate was large. Thus, strength of mortar incorporationg recycled aggregate decreased. Pore volume of 50 nm~2 &amp;mu;m affected strength, carbonation speed and diffusion coefficient of chloride ion.&lt;BR&gt;In order to improve the strength and durability of recycled mortar, in this study mineral admixtures such as ground granulated blast-furnace slag and fly ash were used. Strength and diffusion coefficient of chloride ion of mortar were improved, but carbonation speed was larger than that of normal mortar. Carbonation speed was evaluated by total water-effective binder ratio.

  317. Suppressing effect of fly ash on expansion due to ASR under different conditions of alkali supply

    相馬 良太, 川端 雄一郎, 松下 博通

    Proceedings of the Japan Concrete Institute 28 (1) 833-838 2006

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    フライアッシュを混入したモルタルについて,モルタルバー法・デンマーク法の異なるアルカリ環境下において試験を行い,フライアッシュのASR抑制効果に与える影響について検討した。その結果,モルタルバー法とデンマーク法ではASR抑制効果に違いが生じた。また,デンマーク法ではフライアッシュを20vol%程度以上混入することで,膨張を開始する材齢が増加し,膨張する速度の低下が見られた。また,膨張を開始する材齢,無混和に対する膨張比は本研究が提案する指標と相関関係が見られた。

  318. Microstructure, strength and carbonation of mortar using recycled aggregate

    石橋 昌史, 松下 博通, 佐川 康貴, 川端 雄一郎

    Proceedings of the Japan Concrete Institute 28 (1) 1487-1492 2006

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究は,再生細骨材と新セメントペースト間に存在する遷移帯の細孔構造に着目し,再生細骨材の使用がモルタルの強度及び中性化抵抗性に与える影響について検討したものである。その結果,吸水率の高い再生細骨材ほど,強度が低下し,中性化速度係数が大きくなること,両者は単位水量に骨材の含水量を加味することにより評価できることを示した。さらに,再生細骨材を用いた場合には,新セメントペースト部の細孔量,特に50nm~2μmの量が多くなること,また,強度および中性化速度係数と相関があることを明らかにした。

  319. The method of ASR diagnosis and the determination of maintenance timing for existing structures

    川端 雄一郎, 松下 博通, 猪野 和歌人, 山田 一夫

    Proceedings of the Japan Concrete Institute 28 (1) 2063-2068 2006

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    ASRによる損傷を生じた構造物の診断および維持管理の手法は十分に確立されておらず,過度な対策を行った構造物や再劣化を生じた構造物は少なくない。本報告は,既往のASR診断手法の問題点について考察し,長崎河川国道事務所管轄の鈴田橋側道橋をケーススタディとしてASR診断におけるモニタリングの重要性を論じた。変状を生じた構造物の原因調査においてASR診断方法として詳細調査は非常に有効であるが,ASRとASRによる損傷は必ずしも対応しないことを指摘した。また,構造物に顕著な性能低下が見られず,必ずしもASR損傷と判定できないケースでは,モニタリングを行うことを推奨した。

  320. Expansion of Curbstone Concrete Imitated Granite

    松下博通, 川端雄一郎

    コンクリート工学 43 (12) 32-38 2005/12/01

    DOI: 10.3151/coj1975.43.12_32  

    ISSN: 0387-1061

  321. Expansion of Curbstone Concrete Imitated Granite

    MATSUSHITA H, KAWABATA Y

    コンクリート工学 = Concrete journal 43 (12) 32-38 2005/12/01

    Publisher: 日本コンクリート工学協会

    ISSN: 0387-1061

  322. A STUDY ON UTILIZATION OF MOLTEN SLAG OF MUNICIPAL SOLID WASTE AS FINE AGGREGATE FOR CONCRETE

    佐川康貴, 川端雄一郎, 松下博通, 三宅淳一, 開進一

    土木学会論文集 (802) 171-180 2005/11/20

    DOI: 10.2208/jscej.2005.802_171  

    ISSN: 0289-7806

  323. A STUDY ON UTILIZATION OF MOLTEN SLAG OF MUNICIPAL SOLID WASTE AS FINE AGGREGATE FOR CONCRETE

    SAGAWA Yasutaka, KAWABATA Yuichiro, MATSUSHITA Hiromichi, MIYAKE Jun-ichi, HIRAKI Shin-ichi

    Doboku Gakkai Ronbunshu (802) 171-180 2005/11/15

    Publisher: Japan Society of Civil Engineers

    ISSN: 0289-7806

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    This study was carried out in aiming for utilization of molten slag of municipal solid waste as fine aggregate for concrete. Several examinations were executed by using 4 types of molten slag to investigate the characteristics of each slags and the requisites as fine aggregate in this study.&lt;br&gt;It was clarified that melting methods hardly affected to the chemical composition of slag. However, its physical property depended on the producting method. And, even poor-quality slag, that had unsuitable grading, can be utilized by processing of grinding. Furthermore, consistency of mortar using processed slag was better than that of natural sand. However, the more slag was processed, the less compressive strength of mortar became.

  324. 異常膨張を生じたコンクリート二次製品における遅延型エトリンガイトの生成

    川端雄一郎, 松下博通, 佐川康貴

    土木学会年次学術講演会講演概要集(CD-ROM) 60th (Disk 2) ROMBUNNO.5-205 2005/08/20

  325. フライアッシュの品質がASR抑制効果に与える影響

    相馬良太, 松下博通, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 60th (Disk 2) ROMBUNNO.5-005 2005/08/20

  326. 再生コンクリートの中性化及び塩分浸透性状に関する研究

    佐川康貴, 松下博通, 川端雄一郎

    コンクリート工学年次論文集 27 (1) 1345-1350 2005/06/25

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

  327. 混和材を混入したモルタルの塩分浸透と中性化の複合劣化に関する検討

    川端雄一郎, 松下博通, 藤田数正, 祝井健志

    コンクリート工学年次論文集 27 (1) 841-846 2005/06/25

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

  328. 高炉スラグ微粉末の混入が塩害と中性化の複合劣化に及ぼす影響

    川端雄一郎, 松下博通, 佐川康貴, 藤田数正

    日本コンクリート工学協会論文集 JCI-C65 291-294 2005/06/10

  329. 溶液浸漬実験による埋設型腐食センサの感受性および鋼材腐食に関する検討

    藤田数正, 松下博通, 佐川康貴, 川端雄一郎

    日本コンクリート工学協会論文集 JCI-C65 279-284 2005/06/10

  330. 建築物管理情報ファイリングシステム

    川端雄一郎

    月刊ビルメンテナンス 40 (5) 32-36 2005/05/01

  331. 混和材を混和した再生モルタルの強度及び中性化に関する研究

    佐川康貴, 松下博通, 川端雄一郎

    セメント技術大会講演要旨 59th 40-41 2005/04/28

  332. A STUDY ON RELATIONSHIP BETWEEN POROSITY AND COMPRESSIVE STRENGTH OF CONCRETE WITH RECYCLED AGGREGATE

    佐川康貴, 松下博通, 川端雄一郎

    セメント・コンクリート論文集 (58) 541-547 2005/02/20

    ISSN: 0916-3182

  333. Expansion of Curbstone Concrete Imitated Granite

    Matsushita H, Kawabata Y

    Concrete Journal 43 (12) 32-38 2005

    Publisher: Japan Concrete Institute

    ISSN: 0387-1061

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    Recently, the failure of curbstone concrete have been reported in Fukuoka, Yamaguchi and Okayama Prefecture. The concrete have been characterized by expansion and cracking after several years of service in environments exposed in water. The concrete consists of white cement, limestone and copper slag and it has been manufactured at elevated temperatures for early shipment. As a result, examination identified delayed ettringite formation (DEF) as the damaging mechanism. SEM-EDX analysis identified that ettringite accumulated around limestone in damaged concrete. Therefore, this study concluded that expansion of curbstone concrete have been due to delayed ettringite formation because of steam curing above 80 deg C and the reaction between calcite and monosulfate.

  334. 混和材を混入したモルタルの塩分浸透と中性化の複合劣化に関する検討

    川端 雄一郎, 松下 博通, 藤田 数正, 祝井 健志

    コンクリート工学年次論文集 27 (1) 841-846 2005

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    高炉スラグ微粉末やフライアッシュを混入したモルタルの塩害と中性化の複合劣化に関する基礎的研究として,促進中性化試験と塩水浸漬を交互に繰り返す複合劣化試験を行った。その結果,混和材を混入した場合においては中性化の進行による固定塩化物の解離,細孔容積の増加によって,塩化物イオンの浸透が促進されることが確認された。また,中性化が作用した場合,塩化物イオン濃度の高い領域がモルタル表面ではなくモルタル内部に濃縮されることが明らかとなった。

  335. 再生コンクリートの中性化及び塩分浸透性状に関する研究

    佐川 康貴, 松下 博通, 川端 雄一郎

    コンクリート工学年次論文集 27 (1) 1345-1350 2005

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    筆者らは再生骨材を使用したコンクリートの強度低下の原因は細孔構造の粗大化であり,強度は50nm~2μmの空隙量に依存することを明らかにしている。再生骨材を普通強度のコンクリートへ適用するには,さらに耐久性の低下メカニズムを明らかにする必要がある。そこで,本研究では再生コンクリートの中性化及び塩分浸透性状について検討した。その結果,再生コンクリートの中性化及び塩分浸透性状は再生細骨材の使用の影響を大きく受けることを明らかにし,その原因は強度の場合と同様に細孔構造の粗大化であることを示した。

  336. 再生モルタルの細孔構造と強度の関係

    川端雄一郎, 松下博通, 鶴田浩章, 佐川康貴, 祝井健志

    土木学会年次学術講演会講演概要集(CD-ROM) 59th (Disk 2) 5-189 2004/09/01

  337. フライアッシュの混入がコンクリートの鉄筋間隙通過性に与える影響

    大屋敦志, 松下博通, 鶴田浩章, 尾上幸造, 川端雄一郎

    土木学会年次学術講演会講演概要集(CD-ROM) 59th (Disk 2) 5-445 2004/09/01

  338. 溶融方法が都市ごみ溶融スラグの化学的・物理的性質に及ぼす影響

    川端雄一郎, 松下博通, 佐川康貴, 三宅淳一

    コンクリート工学年次論文集 26 (1) 75-80 2004/06/25

    ISSN: 1347-7560

  339. 溶融方法が都市ごみ溶融スラグの化学的・物理的性質に及ぼす影響

    川端 雄一郎, 松下 博通, 佐川 康貴, 三宅 淳一

    コンクリート工学年次論文集 26 (1) 75-80 2004

    Publisher: 日本コンクリート工学協会

    ISSN: 1347-7560

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    本研究では,都市ごみ溶融スラグのアスファルト舗装用細骨材及びコンクリート用細骨材としての積極的な有効利用を目的とし,異なる過程により生成された都市ごみ溶融スラグ及びそれらを磨砕加工したものを用いて化学的・物理的性質について検討を行った。その結果,生成過程の違いによらず都市ごみ溶融スラグの化学組成はほぼ同様の成分比となるが,物理的性質には差が生じることを明らかにした。また,磨砕加工によりコンクリート用細骨材としての物理的性質を十分に満足できることが分かった。

  340. 再生骨材の品質が再生コンクリートの圧縮強度および乾燥収縮に及ぼす影響

    川端雄一郎, 松下博通, 鶴田浩章, 佐川康貴, 古賀隆一

    土木学会年次学術講演会講演概要集(CD-ROM) 58th (Disk 2) V-507 2003/09/01

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Industrial Property Rights 11

  1. 高温養生用セメント組成物を用いた硫酸塩劣化を抑制されたセメント組成物硬化体の製造方法

    小川 彰一, 柴田 真仁, 蔵永 萌, 渡邊 禎之, 三柴 健太郎, 川端 雄一郎

    特許第7348475号

    Property Type: Patent

  2. 杭支持構造物及びその構築方法

    石塚 新太, 池野 勝哉, 川端 雄一郎, 加藤 絵万, 岩波 光保, 前 嘉昭, 天谷 公彦

    特許第7178050号

    Property Type: Patent

  3. 複数微細ひび割れ型繊維補強セメント複合材料を用いた構造体およびライニング方法

    羽渕 貴士, 網野 貴彦, 田中 亮一, 國枝 稔, 加藤 絵万, 川端 雄一郎, 岩波 光保

    特許第5922993号

    Property Type: Patent

  4. 既設ケーソンの耐衝撃補強方法及び耐衝撃補強構造

    岩波 光保, 審良 善和, 川端 雄一郎, 松林 卓, 伊藤 始, 白根 勇二, 米田 大樹

    特許第5288202号

    Property Type: Patent

  5. 既設ケーソンの耐衝撃補強方法及び耐衝撃補強構造

    岩波 光保, 審良 善和, 川端 雄一郎, 松林 卓, 伊藤 始, 白根 勇二, 米田 大樹

    特許第5288201号

    Property Type: Patent

  6. 杭支持構造物及びその構築方法

    石塚 新太, 池野 勝哉, 川端 雄一郎, 加藤 絵万, 岩波 光保, 前 嘉昭, 天谷 公彦

    Property Type: Patent

  7. 高温養生用セメント組成物及びこれを用いた硫酸塩劣化を抑制されたセメント組成物硬化体の製造方法

    小川 彰一, 柴田 真仁, 蔵永 萌, 渡邊 禎之, 三柴 健太郎, 川端 雄一郎

    Property Type: Patent

  8. 鉄筋コンクリート梁の鉄筋継手構造

    池野 勝哉, 伊野 同, 岩波 光保, 加藤 絵万, 川端 雄一郎

    Property Type: Patent

  9. 複数微細ひび割れ型繊維補強セメント複合材料を用いた構造体およびライニング方法

    羽渕 貴士, 網野 貴彦, 田中 亮一, 國枝 稔, 加藤 絵万, 川端 雄一郎, 岩波 光保

    Property Type: Patent

  10. 既設ケーソンの耐衝撃補強方法及び耐衝撃補強構造

    岩波 光保, 審良 善和, 川端 雄一郎, 松林 卓, 伊藤 始, 白根 勇二, 米田 大樹

    Property Type: Patent

  11. 既設ケーソンの耐衝撃補強方法及び耐衝撃補強構造

    岩波 光保, 審良 善和, 川端 雄一郎, 松林 卓, 伊藤 始, 白根 勇二, 米田 大樹

    Property Type: Patent

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Research Projects 17

  1. Challenges in Deep Seabed Improvement through Phase Equilibrium Design and In Situ Construction: Toward Reducing Seabed Failure Risk

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Pioneering)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2026/06/26 - 2029/03/31

  2. 持続可能なコンクリート開発に向けたセメント硬化体の次世代多階層観察技術基盤の創出

    川端 雄一郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 国立研究開発法人海上・港湾・航空技術研究所

    2026/04/01 - 2029/03/31

  3. Elucidation of fatal failure conditions of aged RC protective structures and its application to advance detection technology

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Kyushu University

    2024/04/01 - 2028/03/31

  4. 異種ASR反応性骨材の異方性機構に基づく微細構造指標による耐久性照査体系の革新

    三浦 泰人, 川端 雄一郎, 高橋 佑弥, 高橋 駿人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 国際共同研究加速基金(海外連携研究)

    Institution: 名古屋大学

    2023/09/08 - 2027/03/31

  5. Development of the cement-based materials resistant against extreme deep sea conditions

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2023/06/30 - 2026/03/31

  6. Active control of internal swelling reactions based on elucidation of microscopic mechanisms

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2023/04/01 - 2026/03/31

  7. Investigation on mechanical properties of concrete subjected to water pressure and external forces

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tokyo Institute of Technology

    2021/04/01 - 2024/03/31

  8. Study on mechanism of DEF occurrence and inhibition based on material and environmental conditions and structural performance of DEF affected members

    Asamoto Shingo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Saitama University

    2020/04/01 - 2023/03/31

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    Concrete cubes with Japanese and French cements were fabricated to be exposed to high temperatures of 80°C, and the expansion behavior related to the high temperature exposure was studied at four locations: Saitama, Yokosuka, Nagaoka, and Okinawa. The results showed that expansion occurred regardless of cement type. The environmental dependency of the expansion rate was dependent on the cement type. The flexural performance of prestressed concrete beam with the expansion was studied. It was found that the effect of the large expansion on the flexural stiffness and loading capacity of the beam was small even though a large number of expansion cracks were observed in the beam.

  9. Evaluation of microstructural damage and estimation of expansion attained to date due to internal swelling reaction of concrete

    Kawabata Yuichiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2020/04/01 - 2023/03/31

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    A method for evaluating micro-damage in a wide area, using a montage image created with 500-900 backscattered electron images, was investigated. In particular, an evaluation method using a spatio-temporal statistical analysis model was devised, and its applicability to internal swelling reactions was examined. In addition, an expansion model in which micro-damage was taken into account was investigated to reproduce the expansion behavior of concrete subjected to temperature variation. Furthermore, as a method for estimating the expansion history of concrete, the relationship between micro-damage features and the expansion to date was compared. As a result, it was shown that it is possible to estimate the expansion to date by determining the total crack length in a certain angular region.

  10. Diagnosis and prognosis of structure affected by internal swelling reactions based on microstructural analysis

    Kawabata Yuichiro, Yamada Kazuo, Ogawa Shoichi, Toutlemonde Francois, Seignol Jean-Francois, Martin Renaud-Pierre

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2016/04/01 - 2019/03/31

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    The methods for diagnosis and prognosis of concrete affected by Internal Swelling Reactions (ISRs) such as alkali-silica reaction (ASR) and delayed ettringite formation (DEF) have been investigated in this study. Firstly, the characteristics of microstructural damage of aggregate and paste in the case of ASR and gap formation in the case of DEF were evaluated. Then the model reflecting the microstructural damage was established and implemented in the numerical analysis developed. In parallel, the testing method for predicting expansion of concrete was also developed. As a result, expansive behavior of concrete block exposed to the field was fairly simulated by combining the numerical analysis and laboratory test.

  11. Study on mechanism of local damage formation of concrete subjected to seawater attack

    Yamaji Toru, Kawabata Yuichiro, Ogawa Shoichi, Yoshida Natsuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: National Institute of Maritime, Port and Aviation Technology

    2016/04/01 - 2019/03/31

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    This study investigated the mechanism of damage of concrete due to seawater attack. Also, the prediction method as well as accelerated testing method were investigated. As the result, the cause of seawater deterioration may be repetition of dissolution and precipitation of ettringite accompanying change of temperature and concentration of pore water. For prediction, simplified model for S penetration depth and Mg penetration depth was developed. Finally, wetting and drying test using seawater for cement paste with small diameter was proposed for accelerated test.

  12. Evaluation on historical expansive characteristics of ASR featuring extensity by optical full-field measurement method

    GODA Hiroki, KAWABATA Yuichiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Kyushu Institute of Technology

    2013/04/01 - 2015/03/31

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    ASR that causes the expansion of the concrete and the rebar ruptures is one of the most interesting deteriorations. There is the residual expansion by core boring as one of the methods to estimate the deterioration of ASR on site. And Estimation of future expansion by the stress release of concrete core is also exists. So, this reserach introduces the stress release method and stick scanner by the digital image correlation (DIC) method. Some digital images of inside or surface on the concrete before and after core boring were used for the stress release analysis and the residual strain. Relationship between stress release and restraint of rebar by the strain distribution around the core was solved. As a result, it was showed that residual strain distribution by DIC method is one of the suitable method to evaluate the deterioration of ASR. Some of deteriorations characteristics were solved by the stress energy method featuring DIC method.

  13. Petrological study on mechanism of volume change of aggregate in concrete

    KAWABATA YUICHIRO

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Independent Administrative Institution Port and Airport Research Institute

    2012/04/01 - 2015/03/31

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    The volume change of aggregate was investigated from the viewpoint of petrographic evaluation in this study. For alkali-silica reaction, the expansive behaviors of concrete with various aggregates were modeled. A model to evaluate the alkalinity of pore solution based on phase composition of cement hydrates with SCMs was also proposed. The proposed method enables to clear the relationship between composition of pore solution and ASR suppression effect quantitatively. Simplified prediction method using accelerated concrete prism test (CPT) was proposed. The result suggested that the proposed prediction method is useful for the evaluation of actual expansive behavior of field-exposed concrete although the method includes some points to improve. Shrinkage of aggregate can be explained with petrogenesis and character of base rock.

  14. Fracture progress mechanism of concrete structures under dynamic loading

    IWANAMI Mitsuyasu, KATO Ema, KAWABATA Yuichiro, GODA Hiroki, TAMAI Hiroki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    2011/04/01 - 2014/03/31

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    In this study, to make clear the failure mechanism of concrete structures suffering dynamic forces, the following three investigations were conducted. In investigation of dynamic full-field measurement of strain, a new measuring method was developed utilizing the optical full-field measurement technique in order to examine the effect of stress velocity on failure behavior of concrete. In investigation of numerical methods of concrete structures subjected to dynamic loading, a novel method was proposed to evaluate cumulative damages in reinforced concrete slabs, by integrating the constitutive laws and failure criteria of concrete members in consideration of localized failure of concrete. At last, by summarizing the knowledge obtained from this study about effects of materials deterioration on dynamic structural performance of concrete members, the design manual of concrete caissons for breakwaters with high resistance against repeated impact loads was formulated.

  15. Multi-scale monitoring of degradation process of reinforced concrete

    KAWABATA Yuichiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Independent Administrative Institution Port and Airport Research Institute

    2010 - 2011

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    This research aims at developing the technique to track degradation process of reinforced concrete(RC) by using digital image correlation(DIC). In addition, combination of the developed method and microscopic observation gives "multi-scale monitoring" which can measure the damage of RC from microscopic level to macroscopic one. Alkali-silica reaction and steel corrosion were focused as the degradation of RC. The result of the experiment showed that DIC is promising tool to evaluate the degradation of RC. Multi-scale monitoring also enables to associate the macroscopic degradation process with the microscopic damaging process which can contribute to clarification of the degradation mechanism of RC. Finally, the combination of DIC and multi-rosette analysis showed one possibility to evaluate the induced strain in concrete due to ASR expansion.

  16. Evaluation of dynamic behavior of ASR-damaged RC member with Damage Index

    KAWABATA Yuichiro, IWANAMI Mitsuyasu, KATO Ema

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (Start-up)

    Category: Grant-in-Aid for Young Scientists (Start-up)

    Institution: Independent Administrative Institution Port and Airport Research Institute

    2008 - 2009

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    This study aimed at the evaluation of static and/or dynamic structural performance of ASR-damaged reinforced concrete (RC) members. The second aim is to develop Damage Index which quantifies ASR-damaged degree of concrete by petrographic technique. The Damage Index to evaluate micro-cracks in concrete was correlated with expansion strain of concrete. From the experimental results, it was made clear that the effects of ASR-damage on static and/or dynamic structural performance of ASR-damaged RC members were small. The results also showed that Damage Index was correlated to mechanical properties of ASR-damaged RC members so that Damage Index was useful to evaluate the ASR-damaged RC structures.

  17. ASR抑制のための各種混和材の適正混入率の機構的解明

    川端 雄一郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 九州大学

    2007 - 2008

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    本研究は,フライアッシュおよび高炉スラグ微粉末といった混和材を混和したセメントペーストについて,熱分析,XRD,選択溶解および29Si MAS NMRの組み合わせによる相組成解析を行い,硬化体の空隙水組成との関連性について評価した。また,反応性骨材を使用したモルタル・コンクリートのアルカリシリカ反応(ASR)による膨張量試験を行い,混和材のASR抑制効果を評価した。 その結果,混和材の混入によりC-S-HのCa/Si比が低下し,その低下割合は混和材のガラス相の組成と表面積に依存すること,Al_2O_3リッチな組成の混和材はC-S-HへのAl同形置換によるアルカリ固定が生じていること,の2点が相組成解析から明らかになった。混和材の混入によって空隙水のOH濃度は低下し,これは上述した相組成の変化によるものであることが明らかになった。フライアッシュを混和したペーストのC-S-HのCa/Si比は,本研究で提案した指標αによって整理することが出来た。指標αはフライアッシュの比表面積,ガラス相のシリカ量,単位ペースト体積あたりのフライアッシュ割合の積で表される。実際に反応性骨材を使用したモルタル・コンクリートのASR膨張量試験では混和材の混入によって抑制効果が認められたが,その効果には品質による差が認められた。ASR膨張制御効果について本研究で提案した指標αを用いて整理すると,良好な相関関係が認められた。 また,反応性骨材のASR膨張性はシリカ鉱物の溶解度のpH依存性に大きく依存することを明らかにした。すなわち,混和材の適正混入率はシリカ鉱物の溶解を抑えるpHまで低減する必要があり,そのための混和材の品質基準について明確にした。

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