• T V Viswa Teja
• Ch. Vineel

Ordinary concrete is a composite material containing cement, water, coarse aggregate and fine aggregate. The resulting material is a stone like structure which is formed by the chemical reaction of the cement and water. This stone like material is a brittle material which is strong in compression but very weak in tension. This weakness in the concrete makes it to crack under small loads, at the tensile end. These cracks gradually propagate to the compression end of the member and finally, the member breaks. The formation of cracks in the concrete may also occur due to the drying shrinkage. These cracks are basically micro cracks. These cracks increase in size and magnitude as the time elapses and finally makes the concrete to fail. The formation of cracks is the main reason for the failure of the concrete. To increase the tensile strength of concrete many attempts have been made. One of the successful and most commonly used methods is providing steel reinforcement. Steel bars, however, reinforce concrete against local tension only. Cracks in reinforced concrete members extend freely until encountering a rebar. Thus, need for multidirectional and closely spaced steel reinforcement arises. That cannot be practically possible. Fiber reinforcement gives the solution for this problem. So, to increase the tensile strength of ordinary concrete a technique of introduction of fibers in concrete is being used. These fibers act as crack arrestors and prevent the propagation of the cracks. These fibers are uniformly distributed and randomly arranged. This concrete is named as fiber reinforced concrete. The main reasons for adding fibers to ordinary concrete matrix is to improve the post cracking response of the concrete, i.e., to improve its energy absorption capacity and apparent ductility, and to provide crack resistance and crack control. Also, it helps to maintain structural integrity and cohesiveness in the material. Their main purpose is to increase the energy absorption capacity and toughness of the material, but also increase tensile and flexural strength of concrete. In the Present study, Steel Fiber Reinforcement and Polypropylene Fiber Reinforcement of 1% and 3% by weight are considered and compared with respect to compressive strength and flexural strength. The present study can be concluded that 3% Steel fibers can be added as a reinforcement to ordinary concrete to enhance both compressive strength by 55% at 28 days curing duration and flexural strength by 60% at 28 days curing duration. Further study may be carried out to find the optimal percentage replacement.

Fiber Reinforced Concrete, Steel, Polypropylene, Compressive Strength, Flexural Strength

"A COMPARITIVE STUDY ON COMPRESSIVE AND FLEXURAL STRENGTH OF FIBER REINFORCED CONCRETE (STEEL AND POLYPROPYLENE) AND ORDINARY CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.485-506, April-2019, Available :http://www.jetir.org/papers/JETIR1904069.pdf

"A COMPARITIVE STUDY ON COMPRESSIVE AND FLEXURAL STRENGTH OF FIBER REINFORCED CONCRETE (STEEL AND POLYPROPYLENE) AND ORDINARY CONCRETE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp485-506, April-2019, Available at : http://www.jetir.org/papers/JETIR1904069.pdf