| 摘要 |
PURPOSE:To improve short-term, middle-term and long-term strength of cement by using a cement admixture containing gypsum, aluminum sulfate and sulfites. CONSTITUTION:This cement admixture contains gypsum, aluminum sulfate or alunite, and sulfites, bisulfites or pyrosulfites. To increase short-term, muddle- term and long-term strengths of cement, at least one kind of material selected from alkali metal aluminate, alkali metal silicate, quick lime, slaked lime and calcium aluminate can be compounded. The compounding ratio of each material in the cement admixture to the cement, is preferably, 0.5-6wt.% of gypsum calculated as CaSO4, 0.4-4.0wt.% of aluminum sulfate and alunite as anhydride, and 0.05-0.8wt.% of sulfites as anhydride. |
