| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture and a cement composition more excellent in expansive performance and higher strength development than conventional. SOLUTION: The cement admixture obtained by heat treating the combination of CaO raw material, Fe2O3 raw material, CaSO raw material, and if necessary Al2O3 raw material, contains free lime, calcium ferrite and/or calcium alumino ferrite, and expansive matter containing anhydrous gypsum and alkanolamines. The cement composition is constituted of a cement and the above cement admixture. |
