Experimental Evaluation Of Nano Silica Effects On Mechanical Properties Of Concrete

Abstract

Concrete is one of the most widely used materials in the construction industry, with its production heavily reliant on cement a major contributor to global CO₂ emissions. To address the environmental concerns associated with high cement usage, this study investigates the potential of nanosilica (NS) as a partial replacement for cement in concrete. Nanosilica, owing to its high surface area-to-volume ratio, can significantly enhance the microstructure of concrete, improving its mechanical and durability properties. This experimental research evaluates the effect of nanosilica on the mechanical performance of M30 and M40 grade concrete. Concrete mixes were prepared with varying nanosilica replacement levels of 2%, 2.5%, 3%, and 3.5% by weight of cement. The study focuses on the compressive strength of the concrete both before and after exposure to acid attack, aiming to determine the optimum nanosilica content for maximum strength and durability. Results indicate that the incorporation of nanosilica not only improves compressive strength but also enhances acid resistance, contributing to longer-lasting and more sustainable concrete structures.