Influence of Nano Silica On Properties of Cement Concrete

Abstract

Concrete is a material that is extensively used in the building industry, whereas some flaws that cause it to lose performance and durability with time, including high permeability, microcracking, and uneven strength. Hence, to reduce these flaws, nanotechnology, specifically the incorporation of nanosilica (SiO2), addresses effectively. Nanosilica enhances concrete by promoting additional calcium silicate hydrate formation, refining the microstructure, and reducing permeability. These improvements make nanosilica beneficial for concrete properties and repair mortars. Hence The impact of nanosilica on different concrete qualities achieved by substituting different percentages of cement (0.5%, 1.0%, 1.5%, and 2.0%) for M25-grade concrete mix is demonstrated in this research work. To ascertain the mechanical Properties, such as compressive strength, split tensile strength, and flexural strength, specimens were cast using nano-Silica concrete. Split tensile and flexural strength are assessed at the age of 28 days, whilst compressive strength is assessed at 7, 14, 28, and 56 days. Results indicate that using nanosilica powder in concrete was able to increase the mechanical characteristics and reduce the density compared to a conventional mix of concrete. When 1.5% nanosilica is substituted for cement, the resulting material exhibits superior mechanical and durability qualities.