What is the term for the exothermic reaction that occurs when water is added to cement?

The term that describes the exothermic reaction occurring when water is added to cement is known as the heat of hydration. This process is critical in the setting and hardening of cement, as it generates heat due to the chemical reaction between cement particles and water. The reaction involves the formation of hydration products like calcium silicate hydrate (C-S-H) and calcium hydroxide, which contribute directly to the strength and stability of the final concrete mixture.

Understanding the heat of hydration is essential because it influences the temperature profile of the concrete during curing, which can affect its durability and structural integrity. The exothermic nature of this reaction may lead to temperature increases that can have implications in large pours or during hot weather conditions, potentially leading to cracking or other issues if not managed properly.

The other terms might refer to related concepts within thermal or chemical reactions but do not specifically relate to the process of hydration in cement. Thus, heat of hydration is the most accurate term to describe the exothermic reaction when water interacts with cement.