Abstract
The low early age strength gain of fly ash-based Portland pozzolana cement (PPC) poses a challenge in many applications. This study tries to improve the early age strength gain of fly ash-based PPC by blending it with limestone calcined clay pozzolan (LC2). Ordinary Portland cement was blended with a typical low calcium fly ash (FA) at replacement levels of 30 and 40% termed as PPC-30% and PPC-40%, respectively. To enhance the mechanical performance of PPC-30% and PPC-40%, the fly ash was blended with LC2 in 1:1 mix proportion. Hydration and strength gain were evaluated using isothermal calorimetry and strength activity tests. Heat evolution results show that the addition of LC2 pozzolana has increased the early age hydration of the blended pastes. Strength activity index of mortar showed improvement in early age performance in both the mixes compared to PPC. Moreover, 30% replacement by LC2 is found to be more beneficial and can achieve strengths comparable to that of OPC.
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