Properties of Portland cement pastes enriched with addition of calcined marl

Increasing global production of Portland cement and the necessity to reduce CO2 emissions have resulted in the need to increase the production and application of blended cements enriched with supplementary cementitious materials (SCMs). Recently, polymineral clays, which are abundantly available across the globe, have gained attention as promising raw materials for the production of SCMs. In this study, the effect of marl on the properties of hardened Portland cement was investigated. The Portland cement pastes enriched with marl (5-20%) calcined at 400-800 °C and ground up to 250-800 m2/kg showed better physical-mechanical properties than those enriched with metakaolin. This study demonstrates the potential of calcined marl to be used as an effective pozzolan additive for Portland cement.