CEMENT COMPOSITION AND METHOD FOR PRODUCING CEMENT COMPOSITION
Japan Patent
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PROBLEM TO BE SOLVED: To provide a cement composition which, even when produced using waste, such as coal ash or soil generated by construction works, can attain a reduction in the amount of water for setting or in the amount of water for unit concrete amount and which can give mortar or concrete that has improved flowability, and also, to provide a method for producing the cement composition.SOLUTION: The cement composition has a Sr content of 0.065 to 1.0 mass% and an MgO content higher than 1.0 mass% but not higher than 3.0 mass%. The method for producing the cement composition comprises: a step (A) in which raw materials selected from a group consisting of limestone, silica stone, coal ash, clay, blast furnace slag, soil generated by construction works, sewage sludge, hydrocakes, and iron sources are proportionated to result in a cement composition having a Sr content of 0.065 to 1.0 mass% and an MgO content higher than 1.0 mass% but not higher than 3.0 mass% and the proportionated raw materials are mixed and burned to produce cement clinker, and a step (B) in which the cement clinker is mixed with gypsum and with, as blending materials, limestone and blast furnace slag, and the mixture is pulverized.
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