Composite Cement in India

The Bureau of Indian Standards (BIS) had standards for either fly-ash (Portland Pozzolana Cement-PPC) or slag-based cement (Portland Slag
Cement, PSC). BIS has recently released the standards for composite cement, which is a blend of both fly-ash and slag with clinker permitting clinker substitution up to 65%. The Composite cement has considerably lower cost of production as well as lower CO intensity.

This study indicates that production of Composite Cement in a 1 MTPA cement plant, requires 57% less raw material, 52% less thermal energy and 34% less electrical energy in comparison to Ordinary Portland Cement (OPC) production. The CO2 emission intensity of Composite cement is 0.36 tCO 2/ton of cement which is 56% lower than OPC.

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