| 摘要 |
PURPOSE: Provided are a cement admixture with high strength, low shrinkage and low temperature application, and a cement composition with much improved initial strength, longtime strength and durability compared with portland cement by mixing cement with the prepared admixture. CONSTITUTION: The admixture comprises 75-100wt.% Al2(SO4)3 as a main material, 0-10wt.% of Na2CO3, 0-10wt.% of NaAlO2, 0-25wt.% of CaCl2, 0-15wt.% of limestone, and 0-5wt.% of magnesium fluosilicate, where the all materials have a specific surface area of 2000cm¬2/g or more, except limestone with a specific surface area of 5000cm¬2/g or more. Also, the cement admixture is prepared by adding 1-10wt.% of the prepared admixture to conventional cement such as portland cement, high early-strength portland cement, fly ash cement or blast furnace slag cement.
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