The effect of sulphates on limestone containing composite cements

This study investigated the interplay between sulfates and limestone and the impact on hydration and mechanical properties of composite slag cements. The total sulfate content was varied at 2, 3 and 4 % by adding ground anhydrite while the aluminate and carbonate contents were kept constant. Samples were analyzed for kinetics of reaction, hydrates formed and mechanical properties at 0.5w/b. The amount of added sulfate influences hydration and compressive strength. The highest compressive strength was observed at 3% sulfate content.