Present study highlights upon suitability of steel slag a waste industrial by-product as alternative to conventional aggregate (Coarse & fine) in concrete constructions. Concrete mixes of M20, M30 & M40 grade (control mixes) cast by replacing aggregates with Slag in 0, 30, 50, 70 & 100%. Properties like density, workability, compressive, split tensile, flexure strengths & soundness were studied. Investigation revealed that compressive strength increased by 4 to 6 % and concrete split tensile and flexure strengths increased by 5 to 8 % at 50% replacements. The replacement of 100% coarse aggregate increased concrete density by 5 to 7 % and split and flexure strength by 6 to 8% over control mixes. The improvement in concrete strength was due to rough surface and higher crushing strength of Slag which improved the bond, flexural & split strength. The higher unit weight of Slag enhanced density of concrete by 7% which could be utilized in special applications. Hence, it could be recommended that Slag could be effectively utilized as aggregates (coarse & fine) in all the concrete constructions like plain concrete and reinforced cement concrete including pavement concrete either as partial or full replacements over a range of 50 to 100%.
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