Abstract
The emergence of nanotechnology has provided new avenues for construction industry. It has been shown that nano-silica with much finer particles than cement, is significantly efficient at increasing the strength and resilience of concrete. The primary objective of this study was to analyze the effect of nano-silica in colloidal state on fresh as well as hardened properties of concrete. For this investigation, colloidal nano-silica of particle size 40 nm was used at a concentration of 30% at a varying replacement dosage (1–4% by weight of cement). In addition, microstructural analysis of concrete specimens was performed. Results have shown that by partial substitution of cement with colloidal nano-silica, there is an increase in consistency with decline in flow and delay in setting time. The substitution was found to increase the compressive strength of all the specimens as compared to controlled specimen. The incorporation of colloidal nano-silica fills the pores of the cement matrix and facilitates the pozzolanic reaction thereby enhancing the C-S-H gel formation. However, the optimized substitution dosage was found to provide the best performance in terms of obtaining denser and more uniform microstructure of the specimen.
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