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The main purpose of this investigation is to study the effects ofpolypropylene fiber on the compressive and flexural strength of normal weightconcrete. Four mixes used polypropylene fiber weight with 0.4, 0.8, 1.0 and 1.5%of cement content. To provide a basis for comparison, reference specimens werecast without polypropylene fiber. The test results showed that the increase ofmechanical properties (compressive and flexural strength) resulting from added ofpolypropylene fiber was relatively high. The increase was about 64 percent forcompressive strength, while, in flexural strength was about 55.5 percent.

polypropylene fiber --- strength of concrete --- fiber reinforced concrete.