International Research Journal of Education and Technology

The growing demand for sustainable and eco-friendly construction materials has led to significant research into the partial replacement of traditional concrete components with innovative materials. This study investigates the combined use of nano silica and waste rubber tyre chips to develop a more sustainable and durable concrete mix. In this research, M25 grade concrete was prepared by partially replacing cement with nano silica in incremental proportions of 0% to 5% at 1% intervals, and simultaneously replacing coarse aggregates with waste rubber tyre chips in proportions of 0% to 25% at 5% intervals. Nano silica, owing to its ultra-fine particle size and high pozzolanic activity, enhances the microstructure of the cement matrix, thereby improving the compressive, tensile, and flexural strengths of the mix while reducing porosity. Rubber tyre chips, on the other hand, contribute to improved energy absorption, ductility, and impact resistance of the concrete, although they may slightly reduce compressive strength at higher replacement levels. The combination of these two materials not only improves the performance characteristics of the concrete but also promotes sustainability by reducing the use of natural aggregates and minimizing the environmental impact of discarded tyres. The experimental results demonstrate that an optimized mix of nano silica and rubber tyre chips can yield a concrete with improved mechanical and durability properties while aligning with the principles of green construction and circular economy practices.

Key Words:- nano silica, enhances the microstructure, ultra-fine particle, rubber tyre chips, experimental results demonstrate