EFFECT ON CONCRETE BY USING COLLOIDAL NANO-SILICA AS A PARTIAL REPLACEMENT OF CEMENT

Civil Engineering

Concrete is most commonly used construction material and it consumes huge amount of cement. Manufacturing of process of cement produces CO2 emission which is harmful to the environment. Method is to reduce cement content in concrete is use of nano-material as a partial replacement of cement in concrete. One of the concrete that is becoming famous for it usage nowadays is nano-concrete and our experimental work deals with the fact that nano-material like nano-silica when added in optimized proportions to a standard M40 Grade concrete improves various properties. CNS nanoparticles with the average diameter of 5-40 nm were used with the five different contents of 1.5%, 3%, 4.5%, 6%, 7.5% by weight. The result showed that the use of CNS particles upto maximum replacement level of 3% and 4.5% produces concrete with improved strength. The workability of fresh concrete was decreased by increasing the content by CNS particles. Various tests like Compressive strength test, Flexural strength, Split tensile strength were carried out. It is concluded that partial replacement of cement with nano-phase CNS particles improves strength of concrete.

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