混杂钢纤维体积率对混凝土强度影响试验研究

采用纤维混杂技术将2种或2种以上纤维材料优化组合，有利于提高纤维体积率，改善单一纤维复合材料的性能。对体积率为3％、4％和5％的混杂钢纤维混凝土进行了强度试验研究，分析了钢纤维混杂和纤维体积率对材料抗压强度和抗折强度的影响。与基准混凝土相比，混杂钢纤维混凝土的抗压强度提高53．4％～63．4％，抗折强度提高106．6％～147．1％，抗折强度的提高幅度远大于抗压强度的，约为2．3倍；混杂钢纤维体积率从3％、4％到5％每增加1％，抗压强度提高5％-10％，抗折强度提高30％～40％，其抗折强度的提高幅度为抗压强度的4倍。

Experimental research on influence of the hybrid steel fiber volume fraction on reinforced concrete strength

The fiber hybrid technology combines two or more kinds of fiber materials with optimization to improve the fiber volume content and the performance of single fiber composite materials. Experimental research on the strength of the hybrid steel fiber reinforced concrete, with steel fiber volume fraction of 3%, 4% and 5%, was carried out. Influence of the hybrid steel fiber fraction on compressive strength and transverse strength was analyzed. Compared with the reference concrete, the compressive strength and flexural strength of the hybrid steel fiber reinforced con- crete increased respectively from 53.4% to 63.4% and from 106.6% to 147.1%. The flexural strength increase is far greater than that of the compressive strength （ about 2.3 times）. When the hybrid steel fiber volume fraction in- creases by 1% from 3% to 4% to 5% ,the compressive strength increases by a range about from 5% to 10%, the flexural strength increases by a range about from 30% to 40%. The increase rate of flexural strength to compressive strength is about 4 times.