| 摘要 |
PROBLEM TO BE SOLVED: To obtain a cement admixture capable of imparting excellent expansion characteristics to concrete even if a mixing rate is low, and to obtain a cement composition. SOLUTION: The cement admixture is obtained by heat treating a CaO raw material, SiO2 raw material and a CaF2 raw material and contains free calcium, calcium fluorosilicate and CaF2, and the cement composition contains cement and this cement admixture. |
