Effect of Different Fiber Content on Mechanical Properties of Recycled Concrete

In this paper, the effects of different steel fiber and polypropylene fiber on the mechanical properties of recycled concrete were studied. The empirical formulas for the axial compressive strength, splitting tensile strength, flexural strength and fiber content of each recycled concrete are given. The results show that the mechanical properties of recycled concrete are improved to different degrees, and the increase of splitting tensile strength is the most significant. When the steel fiber content is 2%, the increase of splitting tensile strength and flexural strength are the most significant, which are 44.8% and 34.0%, respectively; when the steel fiber content is 1.5%, the axial compressive strength has the most significant increase is 19.4%. When the polypropylene fiber content is 0.8kg/m³, the axial compressive strength, splitting tensile strength and flexural strength have the most significant increase, which are 15.8%, 40.5% and 39.6%, respectively. (paper)