CURING OF CEMENT COMPOSITION HIGHLY CONTAINING COAL ASH

摘要

PROBLEM TO BE SOLVED: To obtain a cured cement composition ensuring the necessary amount of a cement, containing a fly ash in a highly larger amount than a conventional limit amount and expressing a large strength over a long period in a short curing period by curing a cement composition comprising the cement and the fly ash in a specific ratio range in water until reaching a material age within a specific age range, and subsequently curing the pre-cured product in air. SOLUTION: This cement composition comprising a cement and a fly ash in a fly ash/cement weight ratio of 25-100% is cured in water until reaching a material age of 7-28 days, and subsequently cured in air. The cement includes various kinds of Portland cements such as the conventional cement, high-early- strength cement, one day cement, moderate-heat cement, sulfate resisting cement and white cement, and the fly ash includes usually non-classified fly ash called raw powder and all lime ashes including cinder ash in addition to fly ashes in the JIS regulation range.