The surface layer of cement and concrete refers to the outermost region, which interacts directly with the environment. This layer is critically important as it governs the material’s durability, aesthetics, and protective qualities. In severe environmental conditions, such as extreme temperatures, chemical exposure, or high moisture levels, the surface layer undergoes various physical and chemical transformations. These transformations include hydration processes in the case of fresh concrete and degradation mechanisms like carbonation, frost damage, and chloride penetration in hardened concrete. The integrity and properties of the surface layer are influenced by the material’s composition, finishing techniques, and curing processes, which determine its porosity, permeability, and resistance to environmental stresses (Scrivener and Kirkpatrick 2008).