Influence of nanosilica on mechanical and durability properties of concrete

Abstract

This article presents the results of experimental study on the effect of mechanical and durability properties of concrete made with ordinary portland cement with partial replacement by nanosilica. Concrete mixes were made of varying nanosilica content at a constant water binder ratio of 0.40. Test outcomes demonstrate that the inclusion of 3% nanosilica as a partial replacement of cement enhances the maximum mechanical properties and reduces the permeability depth and water absorption value of concrete which results in improved performance of concrete. Permeability depth and water absorption of the concrete was reduced by 42.85% and 36.84 % as compared to normal concrete. Carbonation depth was reduced with nanosilica replacement leading to enhanced durability property. Such enhancement in mechanical and durability properties was mainly due to high degree of fineness and more pozzolana activity of nanosilica.