摘   要：研究了不同掺量聚丙烯纤维对水泥基材料力学性能的增强作用，以及纳米SiO₂在高速研磨搅拌+超声波分散的条件下，对掺聚丙烯纤维的水泥基材料的增强作用。试验结果表明，在水泥基材料中掺入聚丙烯纤维能在一定程度上提高试样的抗折、抗压强度，随着纤维掺量的增加，水泥基材料强度呈现先提高后逐渐降低的趋势。采用高速研磨搅拌+超声波的方法分散纳米SiO₂，在纤维及纳米SiO₂掺量均很小的情况下，可较大幅度提高水泥基材料的强度。

Abstract: The influences of different contents of polypropylene fiber on mechanical properties of cement-based material are studied. And the enhanced effects of nanometer SiO₂ on different contents of polypropylene fiber reinforced cement-based material dispersed by the method of high speed grinding + supersonic wave dispersing are investigated. The experiment results show that the polypropylene fiber can increase the bend and compression strength of samples in a certain extent, and with the increase of polypropylene fiber contents, the strength of samples increases at first and then reduces. The strength of cement-based materials increases obviously in the condition of less contents of polypropylene fiber and nanometer SiO₂,when nanometer SiO₂ is dispersed by the method of high speed grinding + supersonic wave dispersing