| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture and cement compositions containing it with good expansion for prevention of pop-out and inhibition of heat of hydration. SOLUTION: The cement admixtures are obtained by firing CaO, Fe2O3, Al2O3, and CaSO4 raw materials and compose expansive additives, which contain free lime, calcium aluminoferrite, and anhydrous gypsum and dextrin having cold water soluble of <70%. The dextrin content is 0.5-15 parts in the cement admixture of 100 parts. The cement compositions comprise cement and the cement admixture. |
