Volume 2 - Issue 3, May - June 2026

The construction industry plays a vital role in global infrastructure development; however, it is also one of the largest contributors to greenhouse gas emissions due to the extensive production and consumption of Ordinary Portland Cement (OPC). Cement manufacturing alone accounts for a significant percentage of global carbon dioxide (CO₂) emissions, creating an urgent need for sustainable and environmentally friendly alternatives. In this context, geopolymer technology has emerged as a promising solution that utilizes aluminosilicate-rich materials activated by alkaline solutions to produce high-performance binders with a substantially lower carbon footprint than conventional cement. Among the various source materials used in geopolymer production, fly ash and metakaolin have gained considerable attention because of their high silica and alumina contents, excellent pozzolanic activity, widespread availability, and ability to enhance the mechanical and durability properties of geopolymer composites. Fly ash contributes to long-term strength development and improved workability, while metakaolin provides higher reactivity, accelerated geopolymerization, and superior early-age strength. The combination of these two materials in blended geopolymer systems has shown significant potential for producing sustainable construction materials with enhanced engineering performance. This review paper presents a comprehensive assessment of recent advancements in fly ash–metakaolin-based geopolymers. The influence of precursor composition, alkaline activator concentration, activator-to-binder ratio, curing temperature, curing duration, and mix design parameters on fresh and hardened properties is critically analyzed. Furthermore, the effects of these parameters on workability, setting time, compressive strength, split tensile strength, flexural strength, durability, chemical resistance, thermal stability, and microstructural characteristics are thoroughly discussed. The review also highlights the role of advanced characterization techniques such as Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Energy Dispersive X-ray Spectroscopy (EDS) in understanding geopolymer formation and performance. Additionally, the environmental benefits, economic feasibility, current limitations, and future research opportunities associated with fly ash–metakaolin geopolymer systems are examined. Based on the reviewed literature, it is concluded that the synergistic combination of fly ash and metakaolin significantly improves geopolymer performance by integrating the long-term strength contribution of fly ash with the high reactivity and early strength development of metakaolin. These blended geopolymers offer a viable and sustainable alternative to conventional cement-based materials, making them highly suitable for future structural and infrastructure applications.

Mr.Aadinath Y. Bhoge, Mr.Ishant B. Dahat,"Performance Analysis of Geopolymers With Metakaolin and Fly ASH Blends Using A Dry Activator" International Journal of Advanced Multidisciplinary Research and Educational Development, V2(3): Page(775-782) May-June 2026. ISSN: 3107-6513. www.ijamred.com. Published by Scientific and Academic Research Publishing.