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在纤维总体积掺率不超过1%的情况下,采用钢纤维、塑钢纤维以及聚丙烯纤维单掺、双掺和三掺配制得到了高流动度纤维增强混凝土;通过稠度试验、抗压试验和劈裂试验,对比分析了纤维混杂方式和纤维混掺比例对基体混凝土工作性能、抗压强度以及劈裂强度的影响规律。结果表明,在混凝土中掺加0.25%~0.35%的引气剂可显著改善混杂纤维增强混凝土的坍落度和坍落扩展度;钢纤维/塑钢纤维/聚丙烯三元混杂可显著提高基体混凝土的抗压强度和劈裂强度最大分别提高了25%和32.61%。;综合考虑混凝土工作性能和力学性能,CF60大流动混杂纤维增强混凝土的纤维混掺比例选定为0.6%SF、0.2%HF、0.11%PPF,引气剂建议掺量为0.35%。
The high fluidity fiber-reinforced concrete was obtained by single-blending, double-blending and three-blending of steel fiber, steel fiber and polypropylene fiber under the condition of the total volume fraction of fiber not more than 1% The splitting tests were conducted to analyze the effect of fiber mixed mode and fiber mixing ratio on the workability, compressive strength and splitting strength of matrix concrete. The results show that the addition of 0.25% -0.35% air-entraining agent in concrete can significantly improve the slump and slump expansion of hybrid fiber reinforced concrete. The steel fiber / plastic fiber / polypropylene ternary hybrid can significantly improve the properties of matrix concrete The maximum compressive strength and splitting strength increased by 25% and 32.61% respectively. Taking into account the workability and mechanical properties of concrete, the proportion of CF60 high-flow hybrid fiber reinforced concrete is 0.6% SF, 0.2% HF and 0.11% PPF, and the recommended dosage of air-entraining agent is 0.35%.