Basic study on Raman spectral property of ASR reactive aggregate and products

Abstract

Alkali-silica reaction (ASR) can be said one of serious problem concerning with concrete structures, because ASR causes not only cracks by expansion of reaction products with water absorption but fracture of reinforcing steels. At this point, for ASR suppression, use of non-reactive aggregate, use of low alkali cement or blended cement, or limit of alkali content is recommended, and it is well known that these countermeasures have ASR controlling effect to some extent. However, especially for important structures or structures expected to have long term service life, ASR should be prevented perfectly. And for it, accurate and rapid judgement method of ASR reactivity is required. Then in this study, Raman spectroscopy was focused as quick and easy analytical method, and in order to evaluate ASR reactivity or ASR propagation level by this method in the future, property of Raman spectrum of ASR reactive aggregate and reaction products were investigated as a basic study.