Abstract
This study aims at developing an analytical model to predict alkali-silica reaction (ASR) induced expansion in concrete considering the aggregate cracking and changes in the chemical composition of ASR gel. To this end, an aggregate cracking experiment was conducted to examine the conditions that cause the cracking of aggregates suffered by ASR, and the chemical compositions of the gels filling cracks were observed using scanning electron microscopy and energy dispersive X-ray spectroscopy. To reflect the effect of aggregate cracking and chemical composition change of gel on reaction kinetics in the analytical model, it was modeled that aggregate cracking leads to more diffuse alkalis into the aggregate, and the gel volume decreased while the gel reacted with calcium in the cement paste. The proposed model was verified by comparison with existing ASR test results, and the rate of change in the chemical composition of the gel was quantitatively investigated.
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