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选用超短微丝钢纤维、多锚点钢纤维分别与聚丙烯纤维混杂的喷射混凝土进行立方体抗压、圆板法弯曲韧性试验。通过荷载-挠度曲线与混凝土板的能量吸收值,研究了纤维掺量、纤维类型以及聚丙烯纤维对混杂纤维喷射混凝土弯曲韧性与变形性能的影响。研究结果表明:喷射混凝土板的弯曲韧性和抗弯承载力随着钢纤维掺量的增加而增加;超短微丝钢纤维喷射混凝土的抗弯韧性与裂缝控制能力均优于多锚点钢纤维喷射混凝土;当体积掺量为1.2%的超短微丝钢纤维与体积掺量为0.11%的聚丙烯纤维混杂时的喷射混凝土表现出的弯曲性能和抗压强度最优。
Using ultra-short microfilament steel fiber, multi-anchor steel fiber and polypropylene fiber mixed concrete shotcrete cubic compression, circular plate bending toughness test. The effects of fiber content, fiber type and polypropylene fiber on the flexural toughness and deformation properties of hybrid fiber-jetting concrete were studied by means of load-deflection curves and energy absorption values of concrete slabs. The results show that the flexural toughness and flexural capacity increase with the increase of steel fiber content. The flexural toughness and crack control ability of the ultra-short microfilament steel fiber shotcrete are better than that of the multi-anchor steel fiber Sprayed concrete. When the volume fraction of 1.2% of ultra-fine micro-fiber steel fibers mixed with the volume content of 0.11% polypropylene fibers mixed shotcrete exhibits the best bending properties and compressive strength.