• MD MUSHIRUDDIN
• Mr. Satyaveer Singh
• Kumar Gaurav

Usage of substitute minerals in concrete helps the conservation of raw materials, reduces CO2 emissions and ultimately helps to a cleaner environment. Increased use of supplementary cementing materials in place of cement in concrete structures worldwide contributes to sustainability in construction. SF, a by-product of silicon metal, and FA, a by-product of coal-fired thermal power stations are the two globally available supplementary cementitious materials which possess pozzolanic properties. SF like all other pozzolanic materials is capable of reacting with the calcium hydroxide, Ca(OH)2 liberated during cement hydration to produce hydrated calcium silicate (C–S–H), which is accountable for the strength of hardened concrete. The high content of very fine amorphous spherical (100 nm average diameter) silicon dioxide particles (present more than 80%) is the main reason for high pozzolanic activity of SF. The SF can improve both chemical and physical properties of concrete. Similarly, FA can react with Ca(OH)2 and yield calcium silicate hydrate (C-S-H) gel and calcium aluminate hydrate (CAH) which are active in creating denser matrix leading to higher strength and better durability.

CO2 emissions, Cementing materials, Sustainability, Cementitious, Amorphous, Durability.

"Concrete using Silica Fume and Fly Ash", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.97-100, April-2019, Available :http://www.jetir.org/papers/JETIR1904P17.pdf

"Concrete using Silica Fume and Fly Ash", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp97-100, April-2019, Available at : http://www.jetir.org/papers/JETIR1904P17.pdf