FLEXURAL BEHAVIOUR OF STEEL FIBER REINFORCED SLABS MADE WITH COPPER SLAG AS FINE AGGREGATE

This paper presents the flexural behaviour of steel fibre reinforced concrete slab made with copper slag as partial natural fine aggregate replacement. In this study, M20 grade steel fibre reinforced concrete slabs were prepared with and without copper slag. In one set of copper slag mixed steel fibre reinforced slabs, the optimum amount of copper slag of 40% and remaining 60% is river sand is used as fine aggregate whereas the other set of slabs are of steel fibre reinforced beams made with 100% river sand as fine aggregate. Flexural characteristics such as first crack, ultimate load carrying capacity and deflection at centre of M20 grade copper slag mixed steel fibre reinforced concrete slabs are evaluated. Load at first crack of M20 grade CS-SFRC slab is more as steel fibre fraction increases. Load at first crack of NC slab is more than CS- SFRC slab because the with addition of copper slag and steel fibres will make either the interfacial transition zone (ITZ) weak due to porous micro-structure at this zone due to free water availability due to copper slag or due to bond issues of steel fibre in CS-SFRC slabs. But ultimate strength in M20 grade CSSFRC slab is more than NC slab. Deflection at the centre of CS-SFRC slab is almost double than the NC slab