This study investigates the mechanical and durability properties of sustainable concrete mixes incorporating Alccofine 1203 alongside supplementary cementitious materials (SCMs) such as Ground Granulated Blast Furnace Slag (GGBFS) and Metakaolin. Various proportions of SCMs partially replaced ordinary Portland cement (OPC) in M40 grade concrete to optimize strength and durability performance. Experimental tests were conducted on compressive, tensile, and flexural strengths at 7, 14, and 28 days of curing. Durability assessments, including water absorption and chloride permeability, were also performed. The results indicate that ternary blends with 15% Alccofine, 30% GGBFS, and 10% Metakaolin exhibited significant improvements in strength and reduced permeability, attributable to enhanced pozzolanic reaction and microstructural densification. This research supports the use of Alccofine-based ternary blends for eco-friendly construction, enabling reduced cement consumption while achieving higher performance and durability.