Basic Mechanical Properties of Recycled Concrete with Basalt Fiber Iron Tailings

In order to improve the utilization rate of construction waste and iron tailings, the effect of modified materials formed under the joint action of basalt fiber and iron tailings on the performance of recycled concrete was studied by orthogonal test. The influence of different factors on the mechanical properties of recycled concrete is analyzed, and the effectiveness of the experiment is simulated by ABAQUS software. The results show that the replacement of natural river sand by iron tailings and the replacement of natural coarse aggregate by recycled coarse aggregate can not only reduce the use of natural aggregates, but also improve the mechanical properties of recycled concrete. The appropriate amount of basalt fiber and iron tailings can increase the peak strain of the specimen under bending, and the stress-strain curve calculated by the finite element software is consistent with the experimental results. Combined with the requirements of working performance and economic benefits, the comprehensive mechanical properties of basalt fiber iron tailings recycled concrete were the best when the basalt fiber volume content was 0.1%, the iron tailings sand substitution rate was 30%, the recycled coarse aggregate substitution rate was 50%, the recycled brick-concrete aggregate mix ratio was 1:2 and the water-glue ratio was 0.38.