The ability to service and increase the loadbearing capacity of structural materials has been considered as an important economic issue for a long time. Concrete is a widely used structural material today. Despite its remarkable properties, including high ductility, high durability, longevity, availability and low cost, concrete is a brittle material and performs extremely poor under flexural and tensile loads. In general, the breakdown and destruction of concrete strongly depends on the formation of cracks and micro-cracks. As loading increases, the micro-cracks interconnect and form cracks. In order to address this problem and to create homogeneous conditions, a series of thin filaments have been used throughout the concrete in recent decades; they are called fibers. Steel fiber is one of the most commonly used fibers in concrete. In this study, the compressive strength of concrete was investigated, with some specimens reinforced with steel and containing pozzolanic materials, which increases the compressive strength of the control specimens. Also the flexural and tensile strength of the steel fiber reinforced specimens were investigated. According to the results, flexural strength increases with increase in steel fibers. The specimens contain 1%, 1.5%, and 2% of the dramix hooked steel fibers. By reinforcing the specimens with steel fibers, the behavior of tensile concrete is more flexible than that of non-steel specimens.