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The low tensile strength and limited ductility, the unavoidable deficiency, of concrete can be overcome by the addition of fibres. High strength concrete (HSC) of 60 MPa containing hybrid fibres, combination of steel and polyolefin fibres, at different volume fraction of 0.5, 1.0, 1.5 and 2.0% were compared in terms of compressive, splitting tensile strength and flexural properties with HSC containing no fibres. Test results showed that the fibres when used in hybrid form could result in enhanced flexural toughness compared to steel fibre reinforced concrete [HSFRC]. The compressive strength of the fibre-reinforced concrete reached maximum at 1.5% volume fractions and the splitting tensile strength and modulus of rupture improved with increasing volume fraction. Strength models were established to predict the compressive and splitting tensile strength and modulus of rupture of the fibre-reinforced concrete. The models give prediction matching the measurements

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In this study the flexural performance of the over reinforced beam with hybrid fibres and GGBS has been experimentally investigated. Concrete is generally brittle material and it fails in brittle nature which is a major drawback in the over reinforced section. The brittle nature of the concrete can be changed by addition of fibres, proper confinement and addition of certain admixtures. Along with the confinement, Steel fibre, Glass fibre and GGBS were used in this study. Four different volume fractions (0.5%, 1.0%, 1.5%, and 2%) of hybrid fibre with 20% GGBS (as a replacement of cement) were used in this investigation. A total of 13 numbers of beams of size 120 mm × 200 mm × 2100 mm was casted. The load deflection curve, ductility index, moment curvature and flexural rigidity were investigated in this study. The overall flexural performance of the over reinforced beams has been increased by having the confinement, addition of fibres and with the presence of GGBS.