Case study on deterioration of concrete in structures due to alkali-silica reaction (ASR) in salt environment and its evaluation methods.

In this study, the relationships between the percentage of reactive andesitic aggregates contained in river gravel, the alkali and chloride ion contents in concrete and the degree of deterioration of concrete due to ASR in a salt environment were investigated by means of visual inspection of concrete structures and various tests using cores extracted from them. The applicability of accelerated curing methods according to the Canadian and Danish specifications to evaluate the alkali-silica reactivity of aggregate or the residual expansion ability of concrete was comparatively examined. It is proposed that appropriate repair and maintenance methods should be adopted for individual ASR-affected concrete structures based on the results of inspection and testing to see if the expansion of the structures has already subsided. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E208431.