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本文采用在C30混凝土中以不同的方式掺入玄武岩纤维与聚丙烯纤维,通过对8种单掺纤维混凝土试件和16种混杂纤维混凝土试件的弯曲性能进行试验研究,分析玄武岩纤维、聚丙烯纤维及其混杂纤维对混凝土弯曲力学特征的影响。试验结果表明,玄武岩纤维、聚丙烯纤维及玄武岩-聚丙烯混杂纤维的掺入对基体混凝土弯曲破坏时承受的最大荷载、破坏点挠度值和韧性指数均有很大的改善,其中,混杂纤维优于单掺纤维。混杂纤维对基体混凝土韧性指数提高最大达到18.1%。本文提出“纤维混杂效应函数”概念,并利用Matlab数据拟合出玄武岩-聚丙烯混杂纤维改善基体混凝土弯曲韧性的混杂效应函数。通过对混杂效应函数求极值,得到玄武岩-聚丙烯混杂纤维对基体混凝土弯曲韧性改善的最佳的体积掺加率,该值与试验数据基本一致。
In this paper, basalt fiber and polypropylene fiber are blended in C30 concrete in different ways. The bending properties of eight kinds of single-doped fiber concrete specimens and sixteen kinds of hybrid fiber concrete specimens are studied. The effects of basalt fiber, polypropylene Effect of Fiber and Its Hybrid Fiber on Bending Mechanical Properties of Concrete. The experimental results show that the incorporation of basalt fiber, polypropylene fiber and basalt-polypropylene hybrid fiber has a great improvement on the maximum load, failure point flexibility and toughness index of the concrete under flexural failure. Among them, In a single doped fiber. The toughness index of hybrid fiber to matrix concrete increases up to 18.1%. In this paper, the concept of “fiber hybrid effect function” is proposed, and the hybrid effect function of basalt-polypropylene hybrid fiber to improve the flexural toughness of matrix concrete is fitted by using Matlab data. By optimizing the confounding effect function, the optimum volume mixing rate of basalt-polypropylene hybrid fiber to improve the flexural toughness of the matrix concrete is obtained, which is consistent with the experimental data.