Addition of limestone in the low heat portland cement - Part 2.

The influence of substitution of clinker by fine limestone on the properties of the low heat Portland cement pastes up to 90 days was studied. The results show that the substitution of 4-6 wt.\% of clinker by fine limestone (76 mum) improves the rate of hydration up to 90 days. In addition, as the amount of limestone increases the heat of hydration and the free lime content slightly enhance, while the total porosity decreases and the compressive strength enhances at early ages.