Elevated temperatures refer to the condition where materials are subjected to heat levels significantly higher than ambient temperatures, which can lead to various physical and chemical changes in the material properties. In the context of cement and concrete, these temperatures can arise from environmental conditions, such as fires or high-temperature industrial environments, or from internal reactions such as hydration heat in mass concrete structures. Elevated temperatures can affect the hydration process of cement, the strength, durability, and chemical stability of concrete, making it a critical factor in construction especially in harsh environments.