Experimental study on steel fibre reinforced concrete for G-30 concrete

Abstract

Concrete plays a major role in the construction industry. However, concrete is weak in tension, in order to overcome this, normally reinforcements are used in construction. But these reinforcements won't be able to stop initiating tensile cracks and other defects in concrete. Aim of this study is to find the optimum volumetric percentage of steel fibre required to increase the tensile strength of concrete with laboratory experiments. For that, seven groups of grade 30 concrete were produced with the addition of steel fibres at different volumetric percentages: 0% (as a control specimen), 0.77%, 0.86%, 0.93%, 1.00%, 1.07% and 1.47% by absolute weight of concrete. Steel fibres with aspect ratio, l/d = 80 with 0.75 mm diameter and hooked at both ends, were used in this study. The effects of adding Steel fibres in concrete were measured for the cube compressive strength (fcu) and splitting tensile strength (fct). Result data clearly shows higher percentage increase in 7 and 28 days compressive strength and tensile strength for 0.86% steel fibres added concrete.