PE纤维掺量对水泥基复合材料力学性能的影响

发布时间：2018-02-02 08:09

本文关键词： PE纤维水泥基复合材料纤维体积掺量弯曲韧性直接拉伸性能多缝开裂　出处：《浙江大学学报(工学版)》2017年11期 　论文类型：期刊论文

【摘要】：针对PE纤维掺量对水泥基复合材料力学性能的影响,开展不同PE纤维掺量下水泥基复合材料的抗压强度、抗折强度、弯曲韧性、直接拉伸性能的试验研究,分析PE纤维水泥基复合材料的开裂模式,通过环境扫描电镜观察和分析薄板弯曲试验中PE纤维的破坏模式。研究表明,不大于2%的PE纤维掺量对水泥基复合材料的抗压强度没有明显改变;当PE纤维掺量大于1%后,PE纤维水泥基复合材料薄板在弯曲荷载作用下表现出极强的韧性特征和变形能力;当纤维掺量大于1.5%时,在直接拉伸荷载作用下PE纤维水泥基复合材料表现出显著的应变硬化特征,并且呈现多缝开裂的稳态破坏模式.
[Abstract]:According to the effect of PE fiber content on the mechanical properties of cement matrix composites, the compressive strength, flexural strength, flexural toughness and direct tensile properties of cement matrix composites with different PE fiber content were studied. The cracking mode of PE fiber cement matrix composite was analyzed, and the failure mode of PE fiber in thin plate bending test was observed and analyzed by environmental scanning electron microscope. The compressive strength of cement matrix composites was not changed obviously when the content of PE fiber was not more than 2%. When the content of PE fiber is more than 1%, the concrete composite sheet of PE fiber shows very strong toughness and deformation ability under bending load. When the fiber content is greater than 1.5, the PE fiber cement matrix composites exhibit obvious strain hardening characteristics under direct tensile loading, and show a steady failure mode of multi-joint cracking.
【作者单位】：浙江大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51578495) 浙江省自然科学基金资助项目(LY16E080002) 杭州市科技发展计划资助项目(20140533B51)
【分类号】：TU528
【正文快照】： 近年来,我国的大型基础工程建设不断增多,建筑结构体系也向高层、大跨度和巨型结构转变,另一方面上世纪许多基础设施开始进入老化阶段,修复十分困难,这些现状都对建筑材料的性能提出很高的要求.水泥混凝土等建筑材料,抗拉强度低、延性韧性差、裂缝控制能力差等缺点在历次地震

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