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AssigneeHSustainability GmbH
InventorsTim SCHADE, Jan SKOCEK, Gerd BOLTE, Nicolas PATO, Ahmed HANAFI, Arnaud MULLER
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Composite cement comprising Portland cement, a calcium carbonate and a mechanochemically activated clay obtained by grinding a clay raw material which was mined from one or more natural clay deposits in a ball mill or roller mill at a temperature below 150° C. until the absorbance units of the OH peak at 3600 to 3700 cm−1 and the SiO2 peak at 900 to 1000 cm−1 in an FTIR spectrum decrease by at least 20%, as well as method for manufacturing the composite cement by blending Portland cement, calcium carbonate and the mechanochemically activated clay.
A composite cement comprising Portland cement, a calcium carbonate and a mechanochemically activated clay, wherein a clay raw material was obtained by mining one or more natural clay deposits and activated by grinding in a ball mill or roller mill at a temperature ≤150° C. until the absorbance units of the OH peak at 3600 to 3700 cm−1 and the SiO2 peak at 900 to 1000 cm−1 in an FTIR spectrum decrease by at least 20% to provide the mechanochemically activated clay wherein the clay raw material and calcination conditions are selected so that the activated clay does not contain more than 3 wt.-% free lime.
A method for manufacturing a composite cement comprising the steps
Dependencies are inferred from the claim text.