Abstract: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.