Experimental Study on Replacement of Cement with Metakaolin Using M-Sand with Steel Fiber of M70 Grade of Concrete

Due to rapid development in urban area, use of high strength concrete in construction industry is increasing rapidly. Mineral admixture such as Ground Granulated Slag (GGBS), metakaolin, silica fume and Alccofine are become unavoidable in high strength concrete because of the effect in hardened concrete properties. Replacing the ordinary Portland cement (OPC) by mineral admixture is retaining the natural resources for future generation. In present scenareio, the complete replacement of river sand by manufactured sand is almost mandatory due to scarcity of the river sand. Super-plasticizers are used to improve the workability of concrete at low water-cement ratio and increases the compressive strength by reducing it. In urban infrastructure development, the high strength concrete is mandatory to reduce the size of structural member, and to increase the utility space to carry heavier load. In this study M70 grade concrete mix was designed with polycarboxylate ether (PCE) based super-plasticizer. The compressive strength, Flexural strength and split tensile strength at various curing periods such as 7, 14 and 28 days. From the experimental test Results it observed that, all the mixes were achieved the target mean strength, among these the manufactured sand has achieved the strength parameter such as split tensile and flexural strength also slightly increased comparatively. The obtained values at the age of 24 days are within the permissible limit as per the codal provisions and the concrete with manufactured sand shows slightly higher value than concrete with river sand.