A Study on Compensation Effect of Autogenous Shrinkage of Mortars with Expansive Additives
Akihiro HORI, Toshiyuki TAMAKI and Hirotoshi HAGIWARA
Abstract:In this study, the compensation effect on autogenous shrinkage of three types of high-fluidity mortars containing different binders prepared by adding with two types of expansive additives at various additive content had been examined. As a result, it was cleared that, any expansive additive has the compensation effect for autogenous shrinkage, especially a free-lime rich calcium sulfoaluminate based-expansive additive has larger compensation effect for autogenous shrinkage than conventional calcium sulfoaluminate based-expansive additives, and that the effect of the mortar prepared with the same additive content of the expansive additive on the expanded volume varies according to the type of binder. Key Words:Expansive Additive, Autogenous Length Change, High Fluidity Mortar, Blast Furnace Slag Cement, High Belite type Cement, Powdered CaCO3