Degradation in cement and concrete refers to the processes by which these materials deteriorate in quality and integrity over time, particularly under adverse environmental conditions. This degradation can occur through various mechanisms, including chemical attack (e.g., from acids, sulfates, chlorides), physical damage (e.g., freeze-thaw cycles, abrasion), and biological factors (e.g., microbial induced corrosion). Each of these mechanisms affects the concrete differently but typically results in the breakdown of the cement paste and the loss of bonding between the cement matrix and the aggregates. Understanding these processes is crucial for improving the longevity and durability of concrete structures.