Durability of Glass in a Hardened Cement Body by Carbonation

Abstract

Glass fiber reinforcing material for GFRC has problems such as degradation of strength by reaction with alkaline materials. Most of all research in this problem had been oriented to modify the glass composition or to coat the surface with polymer. Here we focussed to modify the hardened matrix to have low pH. The matrix was made by carbonation instead of hydration, and the durability of glass dispersed in the matrix was discussed. The degradation speed of soda-lime glass in carbonated matrix was ca. five times smaller than that of hydrated matrix. So glass fiber which has a composition in wider range can be used for GFRC, and we can obtaine these materials with low cost.