Behaviour of Steel Fibre Reinforced Concrete under Flexural Failure

Abstract

Steel fiber reinforced concrete (S.F.R.C) is distinguished from plain concrete by its ability to absorb large amount of energy and to withstand large deformations prior to failure. The preceding characteristics are referred to as toughness. Flexural toughness can be measured by taking the useful area under the load-deflection curve in flexure. Detailed experimental investigation was carried out to determine flexural toughness and toughness indices of SFRC the variables used in investigation were: reinforcement, steel fiber percentage by volume. The aim of this project is to present the findings of the investigation and equations obtained for predicting the desired flexural toughness and in turn the toughness indices for SFRC. These equations are dependent on the ultimate flexural strength, first crack multiple deflections and concrete specimen size. They are independent of the concrete matrix composition.

            The experimental program consists of casting and testing of 3 beams with steel fibers to compare our results with the steel fiber reinforced concrete. The beams used for tests were SFRC beam of size (700 mm x 150 mm x 150 mm) used hook end steel fibers in the concrete for determining flexural strength of concrete . The fiber reinforced concrete beam contains steel fibers in at the rate of 0%, 0.5%, 1%, 1.5% volume fraction of the beams. This experiment requires lots of trail work as I need to find out the maximum strength.