Method of producing a hydraulic cement composition

Abstract

A method for producing a hydraulic cement composition, comprising: - providing a raw material comprising > 18% by weight of kaolinite, ≥ 15% by weight of calcite and a combined muscovite and illite content of < 20% by weight, - calcining the raw material to obtain a pozzolanic material, - mixing the pozzolanic material with Portland cement clinker such that the cement composition comprises > 50% by weight of the pozzolanic material and < 45% by weight of Portland cement clinker.