INFLUENCE OF MATERIAL AND PROCESSING ON STRESS-CORROSION CRACKING OF PRESTRESSING STEEL

In prestressed concrete constructions the high-strength prestressing s teels perform essential bearing effects. Thr alkaline layer of concret e or mortar protects the steels against corrosion and guarantees a per manent load-capacity. If the corrosion protection asa result of poor w orkmanship is not guaranteed from the beginning. or is lost because of lacks of construction in the course of time, or the steels are predam aged during handling, stress corrosion cracking and failure of steel a nd construction may occur. Also an application of unsuitable materials (prestressing steel, injection mortar, concrete) can alone or in comb ination with the before mentioned influences favour stress corrosion c racking. In the contribution the correlations and typical failures are discussed.