Determining the percentage of optimal steel fibers in terms of mechanical properties in ordinary concrete and self-compaction with steel fibers

Reinforced concrete with steel fibers has been widely used in concrete and reinforced concrete structures in order to improve the properties of concrete. The reason for this widespread use is the myriad technical and economic benefits of using steel fibers in a concrete body. Due to these important advantages in concrete properties, the production and application of steel fibers in the industrialized countries of the world has a wide range, so that currently various types of steel fibers with various technical specifications and applications are mass-produced industrially. Reinforced concrete with steel fibers includes a concrete body composed of cement, stone materials, water as well as a percentage of short steel fibers that are mixed in a completely randomly and in different directions in the mixture that the presence of steel fibers determine the characteristics of concrete compared to pure Improves. Determining the optimal percentage of fibers is one of the important factors in terms of economics and efficiency of concrete. In this study, to determine the percentage of optimal fibers in different strength classes, 24 mixing designs were prepared and a mechanical laboratory and fresh concrete were performed. The flexural strength of samples containing 0.9% of steel fibers for categories C40, C50 and C60 was 1.91, 3.86 and 5.14 times higher than the control sample, respectively.