Abstract
The influence of gypsum and limestone powder on autogenous shrinkage of high-flow concrete made with ground granulated blast-furnace slag (BFS) were investigated. Gypsum or limestone powder was added to BFS. Addition of gypsum reduced autogenous shrinkage strain and improved the resistance to cracking due to autogenous shrinkage strain. It was suggested that the increase of the capillary pore volume due to the addition of gypsum related to the reduction of autogenous shrinkage. Addition of limestone powder reduced autogenous shrinkage strain and improved the resistance to cracking due to autogenous shrinkage strain at early ages, but autogenous shrinkage kept increasing at long ages with addition of limestone powder. It was suggested that the reaction of limestone powder caused the increase of autogenous shrinkage at long ages.
