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Advances in Concrete Construction Volume 3, Number 1, March 2015 , pages 039-54 DOI: https://doi.org/10.12989/acc.2015.3.1.039 |
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Mechanisms of ASR surface cracking in a massive concrete cylinder |
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Hiroyuki Kagimoto, Yukihiro Yasuda and Mitsunori Kawamura
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| Abstract | ||
| Relative humidity and strains within a massive concrete cylinder (450 mm X 900 mm) in the drying and the re-saturating process were measured for elucidating the process of ASR surface cracking in concrete. The expansion behavior of mortars in dry atmospheres with various R.H. values and the re-saturating process was revealed. Non- or less-expansive layers were formed in near-surface regions in the concrete cylinder in the drying process, but ASR expansions actively progressed in inner portions. After re-saturating, R.H. values of near-surface regions rapidly increased with time, but expansions in the regions were found to be very small. However, in the middle portions, of which R.H. values were kept 80% ~ 90% R.H. in the drying process, expansion actively progressed, resulting in further development of surface cracks in the re-saturating process. | ||
| Key Words | ||
| alkali-aggregate reaction; massive concrete; humidity; expansion; cracks detection | ||
| Address | ||
| Hiroyuki Kagimoto: Wakamatsu Operations & General Management Office, Electric Power Development Co., Ltd., 1,Yanagasaki, Wakamatsu-ku, Kitakyushu, Japan Yukihiro Yasuda: JPower design Co.,Ltd, Chigasaki, Kanagawa, Japan Mitsunori Kawamura: Kanazawa University, Kakuma, Kanazawa, Ishikawa, Japan | ||
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