摘   要：选取了不同尺寸的聚丙烯纤维、玄武岩纤维、硫酸钙晶须以单掺、双掺、三掺的形式掺入混凝土中，研究了其对混凝土性能的影响；构建了GA-BP神经网络模型，优选出了最佳混杂纤维体系，对优选后的混杂纤维体系试件进行了抗裂性能、抗氯离子渗透性能、干燥收缩测试。结果表明：单掺宏观纤维XW18、细观纤维XW6或微观纤维PL30组试件的力学性能相对较好；双掺时，PP19-XW6、XW6-PL30组试件的28 d力学性能相对较好；三掺时，PP19-XW6-PL30组试件的力学性能相对较好；PP19-XW6-PL30优选组试件的抗裂性能、抗氯离子渗透性能、干燥收缩均较好；3种维度的纤维相互协同，相辅相成，增加了混凝土密实度，抑制了裂缝产生与发展，实现了混凝土增强增韧。Abstract: Different sizes of polypropylene fibers, basalt fibers, and calcium sulfate whiskers were selected to be added to concrete in the form of single, double, and triple admixtures, and their effects on the properties of concrete specimens were studied. A GA-BP neural network model was constructed to select the optimal hybrid fiber system, and crack resistance, chloride ion penetration resistance, and drying shrinkage tests were conducted on the optimal hybrid fiber system specimens. The results show that the mechanical properties of the specimens with the single addition of macro fiber XW18, meso fiber XW6, or micro fiber PL30 are relatively good. When fiber is double doped, the 28 d mechanical properties of PP19-XW6, XW6-PL30 group specimens are relatively good. When fiber is triple doped, the mechanical properties of PP19-XW6-PL30 group specimens are relatively good. The crack resistance, chloride ion penetration resistance, and drying shrinkage of the PP19-XW6-PL30 optimized group specimens are all good. The 3 dimensions of fibers work together and complement each other, increasing the density of concrete, suppressing the generation and development of cracks, and achieving reinforcement and toughening of concrete.

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