The main characteristic of concrete made of Ordinary Portland cement are its low strength in tension, brittle in nature, and its relatively high strength in compression. By embedding conventional steel bars in the concrete and to some extent by addition of sufficient volume of certain fibers, the tensile strength of concrete can be overcome. In this research, fiber reinforced concrete has been broadly studied. For this purpose, the results of some laboratory test in which fibers from Polypropylene (PP) woven bags used for evaluation of mechanical properties of concrete are reported. The fibers are simply cut from locally available Polypropylene woven bags up to 25mm fiber length. Exploring the possibility of re-cycling a waste material, that is produced in large quantities nowadays, while achieving an improvement in some mechanical properties of the concrete is the main aim of this paper. Properties of concrete with respect to effect of inclusion of various proportions of Polypropylene woven bag fiber on the concrete have been dealt in this study. An experimental program was carried out to explore its effects on compressive, split tensile test, flexural strengths of concrete. Concrete mix design of 1:2:4 has been used to make cylinder specimens for compression and split tensile tests and beam specimens for flexural test. Slump test was carried out for each mix at fresh state. A notable increase in flexural and tensile strengths was found. However, no significant change in compression strength was noted.

Keywords : Mix Design, Polypropylene, Compressive Strength, Flexrul Strengt, Mechanical Strength.