Reinforcement in cement and concrete refers to the practice of enhancing the strength and ductility of concrete structures by incorporating materials such as steel rebars, fibers, or meshes. These materials are embedded within the concrete to bear tensile, shear, and sometimes compressive stresses, augmenting the inherently weak tensile strength of concrete. The mechanism behind reinforced concrete is the composite action between concrete and reinforcement, allowing them to act together in resisting loads. Steel, the most commonly used reinforcement, is particularly beneficial due to its similar thermal expansion coefficient to concrete, which ensures uniform behavior under temperature changes.