The growing need for high-performance, green concrete has caused an increase in the use of recycled materials in sustainable construction. This research is about optimizing the mechanical properties of recycled aggregate concrete (RAC) by incorporating fly ash and ground granulated blast furnace slag (GGBS) as partial cement replacements. Different concrete mixtures were made utilizing recycled aggregates by partially replacing cement with fly ash and GGBS. The mixtures were tested for compressive strength, split tensile strength, and flexural strength, and the results of these tests were compared to those of a control mix. The study confirms pozzolanic activity of fly ash and GGBS and their filler effect contribute to strength and durability improvements, influencing mechanical properties. The findings suggest replacing cement with fly ash, GGBS, and recycled aggregates enhances concrete performance, thus fortifying sustainable construction by reducing reliance on natural resources as well as carbon emission. This research establishes a platform for designating RAC for structural application while promoting green building methodologies, proving recycled materials effectively satisfy requirements of modern-day green engineering while improving concrete quality and sustainability.