Expansion of Concrete Containing Recycled Concrete Aggregate Suffering Different Levels of Alkali-Silica Reaction

摘要

Through the completion of this research, there were three main conclusions to be made: 1. Concrete containing alkali-reactive RCA produces higher expansion than concrete containing the original moderately reactive virgin gravel aggregate. Through an earlier study, this was also found to be true for old concrete containing moderately reactive aggregate or high reactive aggregate. 2. The level of deterioration that has previously affected the structure containing gravel reactive aggregate does not have a significant effect on its reactivity as an RCA. This suggests that the reaction occurs at the newly crushed faces of the aggregate. 3. Silane-based sealers were found effective in reducing expansion in existing concrete suffering ASR.