| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture excellent in expansion performance and weathering resistance and also to provide a cement composition containing this cement admixture. SOLUTION: This cement admixture is a material obtained by subjecting a CaO raw material, an Al2O3 raw material, an SiO2 raw material and a CaSO4 raw material to heat treatment all together and contains free lime, hauyne, calcium silicate and anhydrous gypsum, wherein the free lime content is 30-70% and also, the SiO2 content is 1-6%. This cement composition contains cement and the cement admixture. |
