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Concrete cover, in reinforced concrete, is the least distance between the surface of embedded reinforcement and the outer surface of the concrete (ACI 130). The concrete cover depth can be measured with a cover meter. The purpose of concrete cover is to protect the reinforcement from corrosion, fire, and other potential damage.
The concrete cover must have a minimum thickness for three main reasons:
• to protect the steel reinforcement bars (rebars) from environmental effects to prevent their corrosion;
• to provide thermal insulation, which protects the reinforcement bars from fire, and;
• to give reinforcing bars sufficient embedding to enable them to be stressed without slipping.
