钢纤维再生混凝土劈拉和弯拉强度试验研究

为了研究钢纤维体积率和再生粗骨料取代率对破碎卵石混凝土劈拉和弯拉强度的影响规律，设计制作了钢纤维体积率为0%、1%、2%，再生粗骨料取代率为0%、10%、20%、30%、40%的15组试件，并开展了劈裂抗拉和四点弯曲试验。试验结果表明：钢纤维再生混凝土的劈拉和弯拉强度受钢纤维体积率影响较大，两者均随钢纤维体积率的增加而增大，再生粗骨料取代率对二者的影响较小，两者均随再生粗骨料取代率的增加呈现先增大后减小的趋势，且都在再生粗骨料取代率为30%时达到最大值。根据试验数据，提出了钢纤维再生混凝土劈拉强度和弯拉强度的函数关系式。

Tentative Research on Split Tensile and Flexural Tensile Intensity of Steel Fiber Recycled Concrete

In order to study the influences of steel fiber capacity rate and recycled rough aggregate replacement rate on the split tensile and flexural tensile strength of destroyed pebble concrete, 15 sets of specimens with different steel fiber capacity rates of 0%, 1%, and 2% and different recycled rough aggregate replacement rates of 0%, 10%, 20%, 30%, and 40% were designed for splitting tensile tests and four-point bending tests. The test results show that the splitting and bending strengths of steel fiber recycled concrete are greatly affected by the capacity ratio of steel fiber, and both increase with the increase of steel fiber capacity rate, and are less affected by the replacement rate of recycled rough aggregate. In addition, both of splitting and bending strengths show a tendency of primary increasing and then decreasing with the increase of the replacement rate of recycled rough aggregate, and reach their maximum when the replacement rate of recycled coarse aggregate is 30%. Based on the experimental results, the practical relationship between the split tensile intensity and the flexural tensile intensity of steel fiber recycled concrete is suggested.