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Self-compacting concrete (SCC) is also considered as a concrete which can be placed and compacted under its own weight with little or no vibration without segregation or bleeding. The use of SCC with its improving productions techniques is increasing every day in concrete production. Recently, nano particles have been gaining increasing attention and have been applied in many fields to fabricate new materials with novel functions due to their unique physical and chemical properties. in this work 40Mpa self-compacting concrete is developed using modified Nan-Su method of mix design.Slump flow, J-Ring, V- funnel tests are conducted to justify the fresh properties of SCC and are checked against EFNARC (2005) specifications. Specimens of dimensions 150x150x150mm were cast without nano silica and with two different grades of nano silica which is in colloidal state with 16% and 30% nano content are added in different percentages(1%, 1.5% and 2% by weight of cement) to SCC. To justify the compressive strength for 7and28days, specimens are tested under axial compression. Durability properties were also studied by immersing the specimensin5% HCl and5% H2SO4. Sorptivity test has also been conducted. Test results indicate that use of Nano Silica in concrete has improved the performance of concrete in strength as well as in durability aspect.

Influence of Nano Silica on the Strength and Durability of Self Compacting Concrete