EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF HYBRID FIBERS REINFORCED SHOTCRETE
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摘要: 为探讨混杂纤维对喷射混凝土的力学性能影响,分别对双掺仿钢纤维与聚丙烯纤维、双掺钢纤维与仿钢纤维喷射混凝土的抗压强度、抗折强度和折压比进行试验研究,并将其与基准组、单掺纤维组的力学性能进行比较。结果表明,混杂纤维喷射混凝土较单掺纤维时的抗压强度、抗折强度及折压比均有明显提高,并能充分发挥混杂纤维的叠加效应。其中,掺量为0.7%的钢纤维与掺量为0.3%的仿钢纤维混掺时的强度及折压比为最优,并能有效弥补钢纤维易锈蚀、质量大和造价高等不足。Abstract: The experiments of the mixing of macro-synthetic fibers and polypropylene fibers, the mixing of steel fibers and macro-synthetic fibers reinforced shotcrete on the compressive strength and flexural strength were carried out, whose mechanical properties were compared with those of baseline group and single fibers group, The results show that the compressive strength, flexural strength, flexural compression ratio of hybrid fibers shotcrete are more obviously improved than those of single fibers shotcrete, and it can give full play to the superimposed effect.When the mixing contents are 0.7% of steel fibers and 0.3% of macro-synthetic fibers, the strength and flexural compression ratio of shotcrete are the best, and it is effective to make up for the disadvantages of steel fiber with its easy rust, heavy weight and high cost etc.
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