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This article describes the effects of different proportions of metakaolin and steel fiber on the stress-strain behavior of concrete. Concrete has become an important part of infrastructure development due to its wide and wide application. However, its brittleness can cause cracking, and cause some deterioration problems and infrastructure failures. Considering the problem of cracking performance, researchers around the world have conducted various studies to develop concrete with higher performance, longer life, and minimized destructive effects on nature. In order to obtain such characteristics, researchers only focus on the improvement of strength. It is observed that the higher compressive strength can make the substitution rate of metakaolin 16% and that of steel fiber 1.5%. Although the published literature provides some theoretical models and a large amount of experimental data on the compressive performance of fiber-reinforced concrete, there are still considerable reservations about the applicability of these models in design. Stress-strain curve is required for correct design and repair. This article introduces the results of compression tests of steel fiber reinforced concrete carried out in accordance with standard procedures, and rigorously evaluates the proposed model to define compressive stress-strain behavior. The reported test was performed on cylindrical specimens of plain and steel fiber reinforced metakaolin with fiber content of 0.5%, 1.0% and 1.5%. The concrete grade considered in this study is M40.

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