Research for practical application on preventive measure against ASR with use of fly ash

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It is experimentally verified that fly ash has preventive effect against ASR (Alkali Silica Reaction). Blast furnace slag and silica fume are compared with fly ash with regard to the preventive effect while the combination use of these materials is also examined in this study. The reaction rate of reactive aggregate is evaluated through the chemical analysis. By using this reaction rate, the length change of mortar bar is able to be predicted with the numerical model which is based on the one-dimensional diffusion model. Preventive effect of additive is able to be evaluated by predicting the length change of mortar for long term with the proposed numerical method.