Comparative Study of the Mechanical Properties of the Concrete Reinforced with Industrial Steel Fibers and Recycled Metal Chips

In recent years, most of the experimental studies have been performed on the mechanical behavior of reinforced concrete with recycled and industrial steel fibers in foreign countries, and it is necessary to conduct studies on fiber reinforced concrete made from existing materials in our country. In this paper, experimental and numerical research on the mechanical behavior of the fiber concrete has been conducted. In the experimental program, first, by modeling the mix design presented in previous research for recycled fiber concrete, two mixing designs were determined in accordance with the available materials of the country, so that by adding two different types of steel fibers, the desired slump flow is obtained. The effect of industrial fibers and recycled metal chips on the compressive and splitting tensile behavior of fiber reinforced concrete was investigated by performing compressive and tensile tests. The addition of industrial fibers and recycled metal chips has slightly reduced the indirect compressive and splitting tensile strength of the concrete. In the simulation and modeling of finite element compression tests, the formation of cracks in the concrete elements surrounding metal chips elements, confirmed the occurrence of stress gradients in these concrete elements, which led to a reduction in the compressive strength of the fibre reinforced concrete.