PVA及玄武岩纤维对水泥基复合材料力学性能的影响

在水泥基复合材料中掺入适量纤维可显著改善其物理力学性能,但有机-无机混杂纤维对水泥材料性能的影响目前研究不多。进行了单掺PVA纤维、单掺玄武岩纤维以及复掺两种纤维的水泥基复合材料力学性能实验。结果表明,单掺1.6%(体积分数)的短PVA纤维时,水泥基复合材料的抗折强度降低7%、抗压强度提升31%、折压比降低24%;单掺0.3%(体积分数)的短玄武岩纤维时,水泥基复合材料的抗折强度降低8%、抗压强度提升15.7%、折压比降低20%;掺0.3%(体积分数)短玄武岩纤维和0.5%(体积分数)短PVA纤维时,水泥基复合材料的抗折强度几乎无影响,抗压强度显著提升,折压比相对减少,其综合性能最优。

Effect of PVA and basalt fiber on mechanical properties ofcement-based composites

The physical and mechanical properties of cement-based materials can be improved by adding fiber.However,the influence of organic-inorganic hybrid fibers on the properties of cement materials is seldom studied.In this paper,mechanical properties of cement-based materials with single PVA fiber,single basalt fiber and two kinds of fiber were tested.The results showed that when only 1.6%short PVA fiber was added,the mechanical properties of cement-based materials were improved the best.The flexural strength of cement-based materials decreased by 7%,the compressive strength increased by 31%and the flexural ratio decreased by 24%.With only 0.3%basalt fiber staple,cement-based materials showed the best improvement in mechanical properties,with the flexural strength reduced by 8%,the compressive strength increased by 15.7%and the flexural strength decreased by 20%.When adding 0.3%short basalt fiber and 0.5%short PVA fiber,the flexural strength of cement-based composites had little effect,but the compressive strength was significantly improved,and the flexural compression ratio was relatively reduced,which showed the best comprehensive performance.