超高分子量聚乙烯纤维混凝土的基本力学性能

摘要

针对 C70等级高强混凝土，设计了4种超高分子量聚乙烯纤维掺量混凝土，通过立方体抗压、劈裂抗拉和四点弯曲抗折试验，分析了纤维掺量对混凝土力学性能的影响。结果表明：超高分子量聚乙烯纤维对混凝土的抗压强度增强作用不明显，但较大提高了混凝土的抗拉强度和抗折强度，且对混凝土有很好的阻裂、增韧效果。在纤维体积掺量为0．3％～0．5％时，劈裂抗拉强度提高25％以上；掺量0．5％时，弯曲抗折强度提高率超过23％。%Based on the rank C70 high strength concrete,the experiments of the cubic compression,splitting tensile and four-point bending for four kinds of ultra high molecular weight polyethylene (UHMWPE)concrete with different fiber contents were conducted to research the effects of the fiber content on mechanical properties of concrete.The results show that the enhancement effect of the UHMWPE fiber on the compressive strength of concrete is not obvious.However,the added UHMWPE fiber greatly improves the splitting tensile strength and bending strength of concrete and it has excellent effects on toughness and crack resistance of concrete.The splitting tensile strength increases more than 25% when the fiber content is between 0.3% and 0.5%;the bending strength increases more than 23% when the fiber content is 0.5%.