Experimental investigation on mechanical property of concrete with the hybrid supplementary cementitious material

Abstract

This experimental study was undertaken to examine the combined effect of Silica fume (SF),Metakaolin (MK), and Ground granulated blast furnace slag (GGBFs)on the mechanical property (compressive strength) of concrete. The test on compressive strength, for curing days 7,14 & 28 days was performed in this study. The ordinary Portland cement of grade 43 was replaced by Silica Fume (SF), Metakaolin (MK)& Ground granulated blast furnace slag (GGBFs) at 15%, 20% & 25% in different proportions. The casting and testing of 243 cubes were performed for compressive strength of concrete on 27 Mix IDs. It wasobserved that maximum strength for 28 curing days, was achieved for the Mix (SF25MK15GF25), which was 19% more than that of normal concrete without SCM’s. For the Mix (SF20MK15GF25) the strength was 18.25% higher than ordinary concrete which is quite similar to the Mix (SF25MK15GF25). This study conveys that the usage of cement can be reduced to 60% of SCM’s (Silica Fume, Metakaolin & Ground granulated blast furnace slag) by weight without compromising the strength. Hence, it reduces the need for cement for the modern construction industry.