【摘要】 通过单掺、复掺聚丙烯腈（PAN）纤维、聚乙烯醇（PVA）纤维和聚丙烯（PP）纤维3种纤维，对比分析纤维种类和纤维掺量对3 d、28 d水泥基复合材料抗折强度、抗压强度的影响，并采用扫描电子显微镜观察纤维在水泥基复合材料中的分布状态探讨作用机理。结果表明：单掺PAN纤维对水泥基复合材料28 d抗折强度效果最好；单掺PVA纤维对水泥基复合材料28 d抗压强度提升效果最大；单掺PP纤维对水泥基复合材料3 d抗折强度和抗压强度均作用明显。复掺时，当PAN纤维掺量为0.8%,PVA纤维掺量为0.2%时，水泥基复合材料28 d抗折强度最高，可达9.728 MPa；当PVA纤维掺量为0.8%,PAN纤维掺量为0.2%时，水泥基复合材料28 d抗压强度最高，可达41.92 MPa。更多还原

【Abstract】 The effects of fiber type and fiber content on the flexural strength and compressive strength of cement based composites at 3 d and 28 d were compared and analyzed by using three types of fibers,namely,polyacrylonitrile(PAN)fiber,polyvinyl alcohol(PVA)fiber,and polypropylene(PP)fiber.The distribution of fibers in cement based composites was observed using scanning electron microscopy,and the mechanism of action was discussed.The results showed that the best effect on the 28 d flexural strength of cement based composites was obtained by adding PAN fiber alone;PVA fiber alone has the greatest effect on improving the 28 d compressive strength of cement based composites;PP fiber alone has a significant effect on the 3 d flexural strength and compressive strength of cement based composites.When the content of PAN fiber is 0.8% and the content of PVA fiber is 0.2%,the 28 d flexural strength of the cement based composite material is the highest,reaching 9.728 MPa;When the content of PVA fiber is 0.8% and the content of PAN fiber is 0.2%,the compressive strength of the cement based composite material at 28 days is the highest,reaching 41.92 MPa.更多还原