Micro-CaCO 3, or microsized calcium carbonate, is increasingly used in the concrete industry to enhance the mechanical properties and durability of cement-based materials. This additive is incorporated into concrete mixes to refine the microstructure, improve particle packing, and accelerate the carbonation process, which can lead to increased strength and reduced permeability. Under severe environmental conditions, the inclusion of Micro-CaCO 3 in concrete formulations plays a crucial role in enhancing the material’s resistance to chemical attacks, freeze-thaw cycles, and physical wear.