Influence of ASR-Reactive Aggregate Powder on the Reactivity of Concretes

The use of supplementary cementitious materials (SCMs), such as silica fume, is an established measure to prevent alkali-silica reaction (ASR). However, the supply of SCMs currently used tends to decrease as a result of sustainable approaches adopted by corresponding producing industries, which motivates the study of alternative SCMs. Various studies have demonstrated that the powder produced by grinding aggregates considered reactive regarding ASR is effective in reducing ASR expansions, improving the durability of concretes produced. Nonetheless, thus far, the mechanisms related to the action of this material have not been elucidated. Therefore, this study aims to provide a theoretical background to contribute to a better understanding of the action of reactive aggregate powder (RAP) in concrete. Based on the literature review focused on studies in which RAP was used to mitigate ASR, we propose an experimental program to fill in the gaps identified in the literature.