Abstract
The study evaluates the influence of replacing cement with Fly Ash, Brick Dust, and Rice Husk
Ash on the compressive strength of concrete. Cement replacement was conducted at varying
percentages (5%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%) for M20 grade concrete, and
compressive strength was assessed at 7, 28, 90, and 180 days. The results demonstrate that
partial cement replacement can achieve comparable or improved strength performance up to an
optimal level, beyond which strength reduction occurs. For M20 grade concrete, the highest 28-day compressive strength of 43.94 MPa was recorded at 5% Fly Ash replacement, surpassing the control mix (43.46 MPa). Similarly, Brick Dust replacement at 5% resulted in a peak 28-day strength of 43.94 MPa, while Rice Husk Ash exhibited an optimum replacement level of 5%, achieving 44.42 MPa. However, higher replacement levels beyond 20% led to a decline in strength. The study concludes that partial cement replacement using industrial and agricultural by-products can enhance concrete sustainability without compromising strength. This research contributes to the development of cost-effective and environmentally friendly construction materials suitable for sustainable infrastructure.

Keywords: Fly Ash, Brick Dust, Rice Husk Ash, Cement Replacement, Compressive Strength,
Sustainable Concrete, M20 Concrete, M25 Concrete.

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