The term stress corrosion sometimes occurs in references to prestressing. Could you define this simply?
Stress corrosion is the name given to the brittleness which sometimes occurs with steel when it is simultaneously subjected to high tensile stress and corrosive environment. The scientific reason for this phenomenon, which can take place without any of the surface defects usually associated with corrosion, is still not precisely known. Steel embedded in concrete, both bars and pre-tensioned wire or strand, surrounded by dense grout are not ordinarily susceptible to stress corrosion. If post-tensioned steel is not protected by grout or concrete, it must be given some other form of wrapped or applied corrosion protection.