Effect of Wirand FS7-II Steel Wire Fibre on Flexural Capacity of Reinforced Concrete Beam

Concrete is good in compression but today fibre reinforced concrete is perhaps one of the most realistic possibilities to develop the use of concrete in load bearing structures. The hooked-end steel fibre with the dimensions of 0.55 mm in diameter, 33 mm in length and with the aspect ratio of 60 were used in this study. It was concluded that the volume fraction of steel fibre FS7-II was 1 % (23.77 kg/m3). In conventional concrete two beams are used whereas concrete beam with steel fibre FS7_II 1% also had two model and model three removed from reinforced rebar at the top. The overall dimensions of the beams were 200 mm in height, 150 mm in width, and 940 mm in length. The beams were tested under third-point loading test for 28 days. The results showed that the addition of steel fibres in concrete increases the first cracking load, ultimate load, stiffness and ductility of the concrete beams. In comparison with the control concrete group’s maximum increase in the compressive strength at 1% steel fibre was 12.37 at 7 days, 10.44 % at 14 days and 5.58% at 28 days. Increase in the flexural strength at 1% steel fibre was 19.42% at 28 days for model two and 6.76% at 28 days for model three. In general, the significant improvement strength was observed with the inclusion of steel fibres in the conventional concrete with 1%. In this study concrete beam to continued carry load after cracking had occurred, called post crack behaviour or toughness. The first crack load (Pcr) was determined from the curve and SFRC beams showed significant increase in the first crack load over reinforced concrete beams. This increased the flexural modulus of rupture which showed that model two got 19.48% and model three got 6.7% if the beams were containing 1% steel fibres. The SFRC beams with 1% volume fraction of fibres showed an average increase model two with 19.44 % and model three with 6.76% in ultimate load (Pu) when compared to RC beams.