• Hardik B. Sarvaiya
• KALPESH L. KAPADIYA
• PRASHANT K. BHUVA
• ASHISH D. KACHHADIYA
• DARSHAN J. PARMAR

This study investigates the combined effect of ultra-fine fly ash (UFFA) and ground granulated blast furnace slag (GGBFS) on the mechanical strength and durability properties of concrete. As sustainable alternatives to ordinary Portland cement, UFFA and GGBFS not only reduce environmental impact but also enhance long-term performance. Various concrete mixes were prepared by partially replacing cement with different proportions of UFFA and GGBFS. The compressive strength, split tensile strength, and flexural strength were evaluated at 7, 28, and 90 days. Durability was assessed through tests on water absorption, rapid chloride permeability, and resistance to sulphate attack. Results indicated that optimal replacement levels significantly improved strength characteristics and demonstrated enhanced durability compared to conventional concrete. The synergistic effect of UFFA and GGBFS contributed to densified microstructure and reduced permeability, making the blended cementitious system a promising approach for high-performance and sustainable concrete.

"Effective of Ultra Fine fly Ash and GGBFS on strength and durability of concrete", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 10, page no.c55-c58, October-2025, Available :http://www.jetir.org/papers/JETIR2510209.pdf

"Effective of Ultra Fine fly Ash and GGBFS on strength and durability of concrete", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 10, page no. ppc55-c58, October-2025, Available at : http://www.jetir.org/papers/JETIR2510209.pdf