The Consequences of Chloride-Induced Corrosion on Steel Bar and Reinforced Concrete Structures

摘要

It is widely known that corrosion of steel reinforcement is one of the most important durability issues in reinforced concrete design [1]. The corrosion phenomenon can be initiated due to chloride ingress in concrete or due to depassivation of the protective thin oxide film of the steel reinforcement, through the action of carbon dioxide from the atmosphere. The corrosion activity degrades not only the appearance of the structure, but also its strength and safety, with the subsequent reduction in the cross sectional area, the strength and ductility properties of the reinforcement and with the decrease of bond with the surrounding concrete [2,3]. In coastal regions where high chloride concentrations are encountered, chloride-induced corrosion is the major source of environmental deterioration of reinforced concrete structures.