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http://dx.doi.org/10.12989/acc.2015.3.1.039

Mechanisms of ASR surface cracking in a massive concrete cylinder  

Kagimoto, Hiroyuki (Wakamatsu Operations & General Management Office, Electric Power Development Co., Ltd.)
Yasuda, Yukihiro (JPower design Co.,Ltd.)
Kawamura, Mitsunori (Kanazawa University)
Publication Information
Advances in concrete construction / v.3, no.1, 2015 , pp. 39-54 More about this Journal
Abstract
Relative humidity and strains within a massive concrete cylinder (${\varphi}450mm{\times}900mm$) 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 resaturating 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 resaturating, 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.
Keywords
alkali-aggregate reaction; massive concrete; humidity; expansion; cracks detection;
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