In recent years, the utilization of marble powder has garnered considerable interest across multiple disciplines, including civil engineering and construction material sciences. The marble industry generates a substantial waste quotient, estimated at 30-40% of its total output, leading to serious environmental dust pollution. This research examines the effects on concrete properties when marble powder is used to partially substitute cement. The aim is to explore waste reduction strategies while maintaining the necessary structural integrity of the material. In this context, M40 grade concrete was modified by replacing cement with marble powder in proportions of 5%, 10%, 15%, 20%, and 25% by weight. The experiment involved testing the material's flexural, tensile, and compressive strengths at intervals of 7, 28, 56, and 90 days. Results indicate that replacing 10-15% of cement with marble powder in M40 grade concrete is feasible, preserving its characteristic strength profile and not diminishing its compressive capacity. This substitution not only lowers concrete production costs but also contributes to sustainable manufacturing practices. For this study, 20mm aggregate size was used, along with OPC 53 grade cement. Concrete modified with marble powder demonstrated a compressive strength increase of 20% over traditional concrete formulations.