Balasubramanian, J.Chandrashekaran, S.Senthil Selvan"Experimental Investigation of Natural Fiber Reinforced Concrete in Construction Industry", International Research Journal of Engineering and Technology (IRJET), Volume2,issue-01 April 2015.e-ISSN:2395-0056, p-ISSN:2395-0072. www.irjet.net Abstract Concrete made with Portland cement has certain characteristics: it is relatively strong in compression but weak in tension and tends to be breakable. The deficiency in tension can be defeated by the use of conventional rod reinforcement and to some extent by the inclusion of a sufficient volume of certain fibers. Change in the performance of the fiber-matrix composite after it has cracked, is due to The addition of fibers, thereby improving its toughness. On account of its low density, less cost, increased specific strength and modulus, zero health risk, sisal fiber is a promising reinforcement for use in composites and it is easy procured in some countries. There has been an increasing interest in finding new applications for sisal-fiber-reinforced composites that are traditionally used for making ropes, mats, carpets, fancy articles and others..The purpose of this research is based on the investigation of the use of sisal fibers in structural concrete to enhance the mechanical characteristics of concrete. To find and compare the differences in properties of concrete containing no fibers and special concrete with fibers, as well as the correlation on the effects of different type and geometry of fibers to the concrete is the aim of the study. This scrutiny was carried out using several tests, which contained workability test, compressive test, split tensile test, flexural test. A total of ten mix batches of concrete containing 0%, 0.5%, 1%, 2% dosage of fiber were cast. With the best results from the mix, torsion beam elements are cast and torsion testing is to be done.