Heat capacity, also known as thermal capacity, is a critical property of materials that defines the amount of heat required to change their temperature by a given amount. In the context of cement and concrete, heat capacity plays a significant role in determining how these materials respond to temperature variations, particularly under severe environmental conditions. The heat capacity of concrete affects its thermal behavior, including temperature rise during hydration, thermal expansion and contraction, and overall thermal stability. Understanding the heat capacity of cement and concrete is essential for designing structures that can withstand extreme temperatures, such as those encountered in hot arid climates, cold regions, and areas with significant daily temperature fluctuations. This section provides an overview of the significance of heat capacity in cement and concrete, highlighting its impact on the performance and durability of concrete structures under severe environmental conditions.