International Journal of Civil & Structural Engineering

This paper shows the investigation on concrete due to the effect of silica fume with and without steel fibers on Portland Pozzolona cement. In this study we used concrete mixes with Silica Fume of 0%, 4%, 8%and 12% with addition of crimped steel fibers of two diameters 0.5 mm Ø and 1.0 mm Ø with a constant aspect ratio of 60, at various percentages as 0%, 0.5%, 1.0% and 1.5% by the volume of concrete on M30 grade of concrete. The effect of mineral admixture as cement replacement material with and without steel fibers on mechanical properties were analyzed and compared with normal concrete as well as silica fume concrete. In comparison, with control concrete the replacement of 4%,8%,12% and 16% cement by silica fume showed 7.46%, 11.17%, 11.91%and 9.83% increase in compressive strength at 28 days of curing. The optimum combined effect at 8% silica fume and 1.5% steel fiber with normal concrete the maximum compressive strength increase at 0.5 mm Ø and 1.0 mm Ø steel fiber at 28 days of curing were 15.38% and 18.69%, the maximum flexural strength increase were 17.13% and 24.02%.The combined effect of silica fume at 4% & 12% with steel fiber at 0.5%, 1.0% & 1.5% of both diameters 0.5 mm Ø and 1.0 mm Ø at different ages of curing are presented. As a result of the incorporation of crimped steel fibers, Silica fume and Portland Pozzolona cement has produced a strong composite with superior crack resistance, improved ductility and strength behavior prior to failure. On the basis of regression analysis of large number of experimental results, the statistical model has been developed. The proposed model was found to have good accuracy in estimating relationship at 28 days and 90 days Compressive strength with Flexural Strength of concrete.