Study of Concrete with Micro-Silica

Concrete is a building material which is widely used in all over the world. Generally concrete is a mixture of cement, aggregate and water. Cement is very costly material and also it liberate CO2 and other poisonous gases which affect the environment. Now days engineers are attempting to scale down the uses of cement by replacing it partially by waste material like fly ash, micro silica, glass powder, Rice husk, wheat straw etc. The primary aim of this paper is to examine the issue of micro silica when it is added to concrete. When silica is replaced by cement up to 20%, it can alter its attributes. Fields indicate that adding micro silica increase resistance to abrasion, reinforcement corrosion, sulfate and chemical. Compressive strength, consistency and mechanical performances are increased while permeability and heat reduced, it also causes delays in marking time. Micro silica also helps in getting high performance concrete, waterproof concrete and shotcrete. It posses high tensile-flexural strength with a high modulus of elasticity, enhanced strength, higher bond strength and increased stamina. In this paper micro-silica is added to concrete up to 20% of cement.