Cement admixture, cement composition, and high fluidity concrete using the same

摘要

PROBLEM TO BE SOLVED: To provide a cement admixture in which a cement composition is hard to be neutralized, and has a less shrinkage, and, even when applied to concrete having a low water content such as a high fluidity concrete, the shrinkage can be suppressed in low, and by which the high fluidity concrete having high neutralization resistance and reduced heat of hydration can be obtained, and is used mainly in civil engineering and a construction industry, to provide a cement composition and high fluidity concrete obtained by using the same. SOLUTION: The cement admixture contains blast furnace slow cooled slag powder and a shrinkage reduction agent. In the cement admixture, the Blaine specific surface area of blast furnace slow cooled slag exceeds 4,000 cm2 /g. The cement composition contains cement and the cement admixture. The high fluidity concrete is obtained by using the cement composition.