In the pursuit of sustainable infrastructure development, this study investigates the influence of incorporating fly ash (FA) and rice husk ash (RHA) as partial replacements for cement, alongside varying proportions of recycled concrete aggregates (RCA). Four concrete formulations are examined: one utilizing 100% cement, another with 12.5% FA and 12.5% RHA, a third incorporating 20% FA, and the fourth comprising 20% RHA. For each formulation, RCA is introduced at proportions of 0, 25, 50, 75, and 100% by mass of natural coarse aggregates. The engineering properties, including compressive strength, split tensile strength, slump, and water absorption, are comprehensively evaluated through rigorous testing protocols. The findings from this study provide valuable insights into the performance characteristics of different concrete formulations under varying RCA proportions. By elucidating the effects of incorporating FA, RHA, and RCA on concrete properties, this research contributes to the advancement of sustainable construction practices and provides essential guidance for optimizing material selection and mix design in environmentally conscious construction projects.