Specifying, detailing and achieving cover to reinforcement

Failure to achieve the specified concrete cover to reinforcement is probably the most influential factor in premature corrosion of reinforcement, which in turn is the principal form of deterioration in concrete structures. If the required cover is not achieved, this may be immediately evident in the form of exposed reinforcement, structural distress, or at worst collapse. More usually, incorrect cover will only become evident after time when, in the case of low cover, the structure will show signs of premature deterioration through reinforcement corrosion.This guide aims to provide good practice guidance on specifying and achieving a nominal cover to reinforcement once this has been calculated from the design cover chosen by the designer from consideration of bond stresses, fire resistance and durability. The guide approaches this by considering each step in the cover process chain for a traditional type contract. The effects of procurement methods and forms of contract on cover achieved are also discussed. This guide is intended for everyone involved in the process of achieving nominal cover-management, design and site professionals especially.