Enhancing Concrete Strength: The Impact of Silica Admixture

\nResearchers set out to determine if and by what margins Nano silica reduces the compressive strength of concrete. From seven percent to seventeen percent, silica was an ingredient in the concrete mixture. The mix design for M20 grade concrete was cast in accordance with the Indian Standard Code IS 10262-1982. One interesting thing that came out of the experiments was that the concrete’s compressive strength was stronger after 28 days compared to 7 days. In addition, concrete mixtures containing nano silica at concentrations as high as 14% showed noticeably greater compressive strength compared to conventional concrete. The compressive strength of concrete was also shown to be consistently higher when 7, 11, or 14 percent silica was added to it. Compressive strength actually decreased with the addition of silica at a rate of 17%. The finding demonstrated a robust quadratic relationship (R-squared value approaching 1) between the compressive strength (or load) and the percentage of silica in the concrete mix. As can be seen from this correlation, the strength diminishes with increasing silica concentration. So, as a mechanical property enhancer for concrete, nano silica truly comes into its own at a certain point.\n