Experimental Investigation On Flexural BehaviourOf Steel Fibre Reinforced Concrete

Abstract

Steel fibre-reinforced concrete (SFRC) is used increasingly now a days with enormous application. The mixing of steel fibre (SF)to conventional reinforced concrete (RC) improves the cracking strength. It will restrict the growth of cracks and reduce the tensile strain in steel reinforcement bars and smaller crack width. It has excellent tensile, flexural strength, fatigue resistance and ductility. This work studies the behavior of SFRC structural elements. It is to investigate the effects volume of fibre (VF) on the compressive, split tensile, and flexural behaviors of SFRC, and to compare modes of failure. The properties of fresh concrete and the strength of hardened concrete and flexural behaviour of SFRC beams & slabs under two-point loading were conducted. Cubes, cylinders and prisms were cast and tested for compressive, split tensile and flexural strength after a curing period of 28 days. Failure loads v/s cracking patterns of beams and slabs with varying percentage of SF (NF 0percent, 0.5percent, 1percent and 1.5percent) in concrete of M-20 & M-30 grade were studied. Beam of size 150 mm x 150 mm x 700 mm and slabs of size 765 mm x 380 mm x 50 mm of different were casted and tested under two-point flexural loading. The study concludes that, with 3 different fraction of VF, for both strength and economical aspects, 1.0 percent was showed as the best fibre volume. The load carrying capacity of SFRC beams and slabs with 1.0 percentVF is increased by 1.25percent with respect to non fibrous RC beams.