Concrete, the most widely used construction material, often faces challenges related to the depletion of natural river sand, increased construction costs, and environmental degradation. To address these issues, quarry dust—a byproduct of stone crushing—is proposed as a sustainable partial replacement for fine aggregate in concrete. This study investigates the performance of quarry dust in M25 and M30 grade concrete by replacing fine aggregate at 0%, 20%, 40%, 60%, 80%, and 100% levels. Concrete mixes were tested for slump, compressive strength, split tensile strength, flexural strength, and water absorption. Results revealed that workability decreased with higher quarry dust content, while mechanical strength improved up to 60% replacement. Notably, M30 concrete achieved a peak compressive strength of 42 MPa and M25 reached 38 MPa at 60% quarry dust replacement. The findings confirm that quarry dust enhances strength and durability when optimally used, making it a viable eco-friendly alternative to natural sand in structural concrete.
Quarry dust, Fine aggregate replacement, Compressive strength, Sustainable concrete.
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