What does the term "hydraulic cement" refer to?

The term "hydraulic cement" specifically refers to a type of cement that sets and hardens through a chemical reaction with water. This process is known as hydration, where the components of the cement react with water to form a solid mass that binds together the materials in concrete. This property allows hydraulic cement to gain strength even under moist or submerged conditions, making it suitable for a wide variety of construction applications, including those exposed to moisture and water.

The ability to set and harden in the presence of water is a defining characteristic that differentiates hydraulic cement from other types of cement, such as non-hydraulic cement, which requires dry conditions to harden. Understanding this property is essential for proper use in construction and engineering projects where moisture is a consideration.