What is the primary purpose of a concrete cover?

The primary purpose of a concrete cover is to protect the reinforcing steel from corrosion and fire. When concrete is poured, a layer of concrete is placed over the reinforcement bars (rebar) to shield them from environmental factors that can lead to deterioration. Concrete is inherently resistant to many forms of corrosion, but exposure to moisture, chemicals in the environment, and varying temperatures can compromise the integrity of the embedded steel. The cover acts as a barrier, preventing water and contaminants from reaching the steel, thus prolonging the lifespan of the structure.

Additionally, the concrete cover provides fire protection for the rebar. In the event of a fire, the concrete surrounding the rebar helps to insulate it from high temperatures, allowing the reinforcing steel to retain its structural integrity longer than it would otherwise. Thus, this cover is crucial for maintaining the strength and durability of concrete structures over time.