Corrosion is the major cause of deterioration of reinforced, pre-stressed and post-tensioned concrete structures. The main goal for existing structures is to localise areas with corroding ordinary and/or pre-stressing steel stay cable or tendons. Pre-stressing steel may be sensitive to stress corrosion. Unsuitable cements and concrete mixes, chloride-contaminated mortars or concretes, insufficient surveillance during construction and service life, ingress of water and chlorides at leaking joints into not fully grouted tendons can lead to serious damage and catastrophic failure. Based on the evaluation of other damages it may be possible to identify the most important external and internal hazards. External hazards are determined by the environment or the service conditions (action side). Internal hazards include weak structural areas and the intrinsic corrosion protection system of the post-tensioning tendons, the stay cables and the ground anchors (resistance side).

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