Fly ash, a byproduct of coal combustion in power plants, is a pozzolan—a material containing siliceous or aluminous content that, when mixed with lime and water, forms compounds possessing cementitious properties. Utilizing fly ash in concrete enhances the mix’s performance, environmental sustainability, and cost-effectiveness. In concrete, fly ash acts as a partial replacement for Portland cement, reducing the overall carbon footprint of the manufacturing process. It improves the workability of the concrete mix, reduces heat of hydration, and increases the durability and strength of the concrete over time. The inclusion of fly ash is particularly significant in large-scale construction projects where its properties can contribute to the longevity and resilience of structures.