CEMENT ADMIXTURE AND CEMENT COMPOSITION

摘要

PURPOSE: To obtain a cement admixture and a cement composition used in an engineering work and construction industry. CONSTITUTION: The cement admixture consists essentially of amorphous calcium aluminate borate having 2.5-3.5 CaO/Al2 O3 molar ratios and the contents of 3-20wt.% B2 O3 and being <=40μin the max. particle size and inorganic sulfate. The cement composition is prepared by incorporating the cement being <=40μin the max. particle diameter and the cement admixture. By using the cement admixture especially as a grouting material, the cement composition excellent in realization of the strength and in material separation resistance, is obtained.