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Concrete is the most widely used construction material in the world, and its performance is largely governed by the type and quality of aggregates used. The increasing demand for natural coarse aggregates, coupled with the growing concern over construction and demolition waste, has prompted researchers to explore sustainable alternatives. This study investigates the effect of replacing conventional coarse aggregate (Natural Aggregate, NA) with Crushed Clay Bricks (CCB) on the compressive strength and density of M20 grade concrete at replacement levels of 0%, 10%, 20%, 40%, 60%, 80%, and 100% by weight. Standard cube specimens of 150×150×150 mm were cast, water-cured at 27± 2°C, and tested at 7 days and 28 days as per IS 516:1959. Results show that compressive strength decreases progressively with increasing CCB content; however, replacements up to 20% maintain acceptable strength values meeting M20 requirements (>20 N/mm² at 28 days). Concrete density also reduces with increasing CCB content, indicating the potential of CCB concrete as a lightweight construction material.