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研究了掺花岗岩石粉的高韧性水泥基复合材料的基本力学性能。采用废弃花岗岩石粉部分取代磨细砂,制备具有不同石粉质量取代率的水泥砂浆;并对其进行抗压、抗折试验分析,得到最优的石粉取代率约为25%;在此最优石粉取代率的基础上配制出掺花岗岩石粉的高韧性水泥基复合材料;并研究聚乙烯醇(PVA)纤维体积掺量(0~1.5%)及其长径比(158~316)对混凝土复合材料基本力学性能的影响。研究结果表明,试验中,当花岗岩石粉掺量一定时(25%),纤维体积掺量1.5%且长径比237时电镜扫描显示纤维与基体界面结合最紧密,力学性能最佳,此时的极限拉应变高达3.03%,约为普通水泥基材料的300倍。
The basic mechanical properties of high toughness cement-based composites doped with granite powder were studied. Part of the abandoned granite powder instead of sanding sand, prepared with different mass replacement rate of stone powder cement mortar; and its compressive strength, bending test analysis, the optimal stone powder replacement rate of about 25%; the best stone powder (0-1.5%) and its aspect ratio (158 ~ 316) of polyvinyl alcohol (PVA) fiber were studied to fabricate high toughness cement-based composites with granite powder. The impact of basic mechanical properties. The results show that when the content of granite powder is constant (25%), the fiber volume content is 1.5% and the aspect ratio is 237, the scanning electron microscope shows that the interface between fiber and matrix is the most compact and the mechanical properties are the best Ultimate tensile strain of up to 3.03%, about 300 times the ordinary cement-based materials.