EXPERIMENTAL INVESTIGATION ON THE COMBINED DEGRADATION MECHANISM OF ASR AND DEF

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  • SHIBUI Yuto
    GENERAL BUILDING RESEARCH CORPORATION OF JAPAN（5-8-1, Fujishirodai, Suita-shi, Osaka 565-0873, Japan）
  • YOSHIDA Natsuki
    SHIMANE UNIVERSITY, Science of Environmental Systems, Graduate School of Natural Science and Technology（1060, Nishikawatu-cho, Matsue-shi, Shimane 690-8504, Japan）

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  • ASRとDEFの複合劣化メカニズムに関する実験的検討

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<p>In addition to alkali-silica reaction （ASR）, delayed ettringite formation （DEF） has recently been attracting attention as a cause of degradation due to internal swelling reaction of concrete, and it has been suggested that ASR and DEF chemically interact with each other in the degradation process, but many unknowns remain. In this study, combined degradation of ASR and DEF was experimentally reproduced in concrete specimens, and expansion ratio were measured, and cross-sectional observation and elemental analysis confirmed that the expansion ratio is not necessarily larger in combined degradation than in cases where ASR and DEF occur independently. In addition, there is a correlation between the pH calculated from the alkali concentration and the change in the expansion ratio, and it was confirmed that a gradual decrease in pH causes a gradual increase in the expansion ratio, while a rapid decrease in pH causes a sudden increase in the expansion ratio.</p>

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