Abstract
This study reports the suppressing effect of fly ash incorporated as the part of fine aggregate on the expansion of mortar due to alkali-silica reaction (ASR). In this study, 3 types of fly ash were tested according to 2 types of accelerated mortar bar test. As a result, the larger the replacement ratio of fly ash became, the less the expansion of mortar. The effectiveness of fly ash on expansion due to ASR was different according to the chemical composition and particle size of fly ash. More quantities of fly ash are required in Danish method than JIS method to suppress expansion due to ASR. It was revealed that the suppressing effect of fly ash was affected by the contents of amorphous silica and calcium and the specific surface area of fly ash.
