【摘 要】
：
Comparing with that of low-calcium fly ash (LF) or fly dreg (FD), chemical content of high-calcium fly ash (HF) waves more much. Coarse grain, which existing in
【机 构】
：
Key Laboratory for Advance Civil Engineering Materials(Ministry Education),Key Laboratory for Silica
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
Comparing with that of low-calcium fly ash (LF) or fly dreg (FD), chemical content of high-calcium fly ash (HF) waves more much. Coarse grain, which existing in HF, would determine soundness more seriously than fine one. Grinding it is a simple method to result this problem. Because of with thiner specific surface and higher CaO content, fine grain exhibits higher activity of hydration than coarse one. Activity of active admixture (AF), which is produced by ways of grinding HF together with calcium carbide sludge (CS), desulfurize gypsum (DG), calcine desulfurize gypsum (CG) and NS (Na2SO4+FeSO4), can catch up with that of grinding blast furnace slag (GBFS) powder with about 400 m2/kg specific surface. AF costs lower than GBFS. 20% cement replaced by the equal amount of AF, compression strength of concrete is similar to that control one, and electrifies coulomb of concrete at 90 days age reduces to about half of control one.
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