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Advances in Concrete Construction
  Volume 3, Number 1, March 2015 , pages 039-54

Mechanisms of ASR surface cracking in a massive concrete cylinder
Hiroyuki Kagimoto, Yukihiro Yasuda and Mitsunori Kawamura

    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
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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