摘 要 ：为了研究超细粉体在水泥基材料中的应用，对掺加不 同活性超细粉体的水泥基试件进行了抗压强度和抗折强度的测 试，讨论了矿粉A 掺量、硅粉掺量、复掺矿粉A 和硅粉对水泥 基材料力学性能的影响。结论表明 ：活性超细粉体对水泥基试 件的抗折和抗压强度有较大影响，尤其是硅粉能够很好地提高 试件的抗折强度和抗压强度。通过 SEM 形貌分析，说明掺加的 超细粉体能够与水泥基材料内部的不利成分 Ca (OH) ₂ 发生二次 水化反应，生成有利的C-S-H 凝胶, 有效改善水泥基材料的微 观结构。 

关键词：超细粉体；水泥基材料；抗折强度；抗压强度

Abstract: To study the application of ultrafine powder in cement based material, the cement-based samples mixed differentreactive min eral composite additive were tested on the flexural strength and com pressive strength. The effects of several factors such as the volume of mineral powder A, the volume of silica fume, and the percentage of mineral powder A blending with silica fume, on the mechanical proper ties of cement-based material were discussed. The results showed that the ultrafine powder of reactive mineral composite additive influenced greatly the flexuralstrength and compressive strength of cement-based material. Especially the silica fume can improved the flexural strength and compressive strength better. The SEM analysis showed that the second hydratation of ultrafine powder together with the disadvantage component Ca(OH)₂inside the samples occured to produce the advan tage C-S-H gel and to reform the microstructure of cement-based materials effectively. 

Keywords: ultrafine powder; cement-based materials; flexural strength; compressive strength