Experimental investigation of the effect of Korta fibers and rubber granules on the strength and ductility of concrete

Today, with the development of the construction industry and the use of concrete as one of the most widely used building materials in the structural industry, it is expected that sufficient research will be conducted on all dimensions and angles of concrete. Since one of the main weaknesses of concrete is its low tensile strength and brittle behavior, steps must be taken to reduce its negative effects, and one of the solutions is the use of additives. In this research, the effect of Korta fibers and recycled rubber granules on the tensile, flexural, compressive and ductility behavior of concrete has been investigated in an Experimental. For the research, 45 Experimental samples were made with 5 different mixing designs (0.5 and 1% Korta fibers, 5 and 10% granules). According to the output results, it was observed that in the study of compressive and tensile strength, the mixing design with 5% granules and 1% Korta fibers (CG5F1) resulted in a 12.7% increase in compressive strength and a 16% increase in tensile strength compared to the control concrete. In the study of flexural strength and ductility, the mixing design with 5% granules and 0.5% Korta fibers (CG5F0.5) resulted in a 10.47% increase in flexural strength compared to the control concrete. As a result, it is observed that the use of rubber granules reduces the strength parameters of concrete and Korta fibers increases the strength and ductility parameters. Therefore, if compressive, tensile, and bending strength are of particular importance in a structural design, it is recommended to avoid rubber granules and switch to using Korta fibers.