CEMENT COMPOSITION AND CEMENT KNEADED PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a cement composition which can use a large quantity of industrial waste or industrial by-products as a cement clinker raw material, has excellent flowability direct after being kneaded and is small in the secular change of flowability.

SOLUTION: The cement composition contains cement clinker and gypsum and the molar ratio (MgO/C3A) of MgO to C3A obtained by Bogue calculation in the cement clinker is 0.8-1.8. The quantity of C3A held in the cement clinker is 9-15 mass % in the Bogue calculation and the quantity of MgO held in the cement clinker is >1.0 mass%. The yield value of cement paste prepared by adding water and a polycarboxylic acid-based dispersant into the cement composition after 10 min from the start of charging water and kneading is≤23 Pa.

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