DURABILITY PROPERTIES OF CONCRETE WITH EXPANSIVE ADDITIVE

Abstract

This paper presents a study on durability properties of concrete using an expansive additive. In this research, the effect of expansive additive (EA) content, fly ash (FA) content and water to binder ratio (W/B) on durability such as carbonation resistance of concrete, sulfate resistance of mortar, chloride penetration and chloride binding capacity of paste were studied. The results indicate that, when EA content is controlled at not over 30 kg/m³, carbonation resistance of both cement-only expansive concrete and fly ash expansive concrete are better than that of concrete without expansive additive. But when amount of EA is higher than 30 kg/m³, carbonation resistance of fly ash expansive concrete becomes worse. Expansive additive has a negative effect on sulfate resistance and chloride binding capacity of concrete but tends to reduce chloride permeability.