INFLUENCE OF Nano Silica On Mechanical Properties Of Concrete_733

The construction industry increasingly demands sustainable materials with enhanced performance characteristics to address environmental concerns and structural requirements. This experimental investigation evaluates the influence of nano silica as a partial cement replacement on the mechanical properties of concrete mixtures. The study employed a systematic approach where nano silica was substituted for Ordinary Portland Cement at replacement levels of 0%, 1%, 2%, and 3% by weight, with concrete specimens prepared using standard fine and coarse aggregates following established mixing procedures. Comprehensive mechanical testing was conducted to assess compressive strength at 7, 14, and 28 days, split tensile strength using cylindrical specimens, and flexural strength through four-point bending tests on beam specimens. The results demonstrated significant improvement in mechanical properties with optimal performance observed at specific replacement percentages, indicating enhanced strength development and structural performance compared to conventional concrete. The findings reveal that nano silica replacement not only reduces cement consumption for environmental benefits but also provides superior mechanical characteristics, establishing viable dosage ranges for practical construction applications and contributing to the development of sustainable, high-performance concrete formulations for modern infrastructure projects.