低掺量三元混杂纤维混凝土弯曲韧性试验研究

发布时间：2018-08-13 17:43

【摘要】：借助正交试验设计方法,研究了钢纤维、聚丙烯纤维、玄武岩纤维三种因素对混杂纤维混凝土弯曲韧性的影响,并筛选出增强、增韧效果最佳的纤维组合,结合荷载-挠度曲线,对混杂纤维混凝土变形过程、破坏机理进行描述。研究表明,钢纤维含量是影响混杂纤维混凝土弯曲韧性的关键因素;钢纤维体积掺量为1.5%,聚丙烯体积掺量为0.15%,玄武岩体积掺量为0.2%,得到的混杂纤维混凝土试件在破坏前期的增强增韧效果最好;钢纤维体积掺量为2%,聚丙烯体积掺量为0.1%,玄武岩体积掺量为0.2%,得到的混杂纤维混凝土试件在破坏后期的增韧效果最好,同时结合荷载-挠度曲线借鉴复合材料理论和纤维间距理论分析了其破坏过程及增韧机理,可为实际工程设计和选材提供参考。
[Abstract]:The effects of steel fiber, polypropylene fiber and basalt fiber on flexural toughness of hybrid fiber concrete were studied by orthogonal design method. Combined with load-deflection curve, the deformation process and failure mechanism of hybrid fiber reinforced concrete are described. The results show that the steel fiber content is the key factor to affect the flexural toughness of hybrid fiber reinforced concrete. The volume addition of steel fiber is 1.5, the volume of polypropylene is 0.15 and the volume of basalt is 0.2. The results show that the strength and toughness of the concrete specimens are the best in the early stage of failure. The volume addition of steel fiber is 2, polypropylene is 0.1, basalt is 0.2, and the toughening effect of hybrid fiber concrete is the best in the later stage of failure. Combined with load-deflection curve, the failure process and toughening mechanism of composite material theory and fiber spacing theory are analyzed, which can be used as a reference for practical engineering design and material selection.
【作者单位】：天津市土木建筑结构防护与加固重点实验室;天津城建大学土木工程学院;天津大学建筑工程学院;
【基金】：国家重点基础研究发展计划(973)项目(2011CB013603) 国家自然科学基金项目(51678389)~~
【分类号】：TU528.572

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