Limestone powder, a finely ground form of limestone, is often used as a supplementary cementitious material (SCM) in concrete mixtures. It typically consists of calcium carbonate (CaCO 3) and is used to partially replace cement in the mix. This substitution is driven by economic, environmental, and performance motivations. The use of limestone powder in cement and concrete reduces the carbon footprint associated with cement production, as it allows for lower clinker content. Furthermore, the addition of limestone powder can enhance the workability, strength, and durability of concrete. In sustainable construction practices, limestone powder is valued for its ability to improve material properties while reducing the environmental impact of concrete production.