Climate change is a significant global threat to human sustainability, primarily due to the emission of CO₂ gases into the atmosphere, which negatively impacts the environment. A major contributor to these emissions is the production of cement, which releases an amount of CO₂ equivalent to the quantity of cement produced. To mitigate this issue, extensive research has been conducted to identify alternative binder systems to replace traditional cement. While no complete replacement with identical properties has been found, alkali-activated binders present a promising alternative. This study focuses on developing such an alternative binder system using eggshell powder (ESP) as a partial replacement for fly ash (FA) and Ground Granulated Blast Furnace Slag (GGBS) in alkali-activated concrete (AAC). The concrete, referred to as ternary blended geopolymer concrete in this study, incorporates three binder materials: fly ash, GGBS, and ESP. These materials are activated using sodium hydroxide (NaOH) and sodium silicate (Na₂SiO₃) as alkaline solutions. Various strength tests, and durability tests were conducted on G40 and G60 concretes. The results indicate that the optimum mix with 50% flyash, 30% GGBS, and 20% eggshell powder, activated using 8 M NaOH and sodium silicate in a 2.5:1 ratio (Na₂SiO₃/NaOH), provided the best outcomes, outperforming AAC made solely with FA and GGBS.