What is the purpose of concrete cover over rebar?

The purpose of concrete cover over rebar is primarily to prevent corrosion and protect the reinforcement. When rebar is embedded in concrete, the concrete acts as a barrier against environmental elements that can lead to corrosion, such as moisture, chlorides, and other harmful substances. This protective cover helps ensure that the rebar maintains its structural integrity over time, allowing it to effectively support loads and contribute to the overall strength of the concrete structure.

Additionally, the thickness of the concrete cover is critical for providing structural durability, fire resistance, and bond strength between the concrete and the rebar, ensuring that the reinforcement functions properly within the concrete. Making sure that the concrete cover is adequate is a fundamental aspect of reinforced concrete design and construction.