Concrete is the most versatile construction material. Yet its application in structural engineering often involves technique of reinforcing it with other material. Fiber reinforced concrete is a concrete mix with an addition of small discrete uniformly distributed needle like material called fibers. This fibers used in concrete can be of different types which include steel, glass, carbon or even natural fibers. The addition of this fibers can improve the structural behavior of the concrete in

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... rms of compressive stress, flexural stress, tensile stress and shear stress. This paper evaluate the effect of two types of fibers in plain C30/35 concrete containing 0.2%, 0.4% and 0.6% by volume by conducting an experimental study on compressive strength, tensile strength, flexural strength and shear strength of specimens at 7 and 28 days. A total number of 132 tests have been conducted. The experimental results revealed that an addition of 0.2%, 0.4% and 0.6% of E glass fiber in concrete improved the concrete flexural strength by 3.6%, 8.5% and 4.2%, shear strength by 43.94%, 50.9% and 59.39%, tensile strength by 2.36%, 5.3% and 9.44% but have no significant impact on the compressive strength. On the other hand an addition of 0.2% and 0.6% woven fiber in concrete reduced the compressive strength by 4.8% and 5.85%, where as an addition of 0.4% woven fiber results in 10.85% compressive strength improvement, indicating that this amount is an optimum, the flexural strength is reduced by 7.36%, 7.9% and 9.94% for each addition of woven fiber. These results confirmed that appropriate use of E-glass fiber in concrete can enhance the shear, tensile and flexural strength of concrete. It is proven that the use of woven fiber in concrete is not recommended as it is not significantly increasing the mechanical property of concrete.