Current status on fatigue of corrosion reinforcement

Reinforced concrete(RC) structures taking full advantages of concrete and reinforcing steel bars are widely applied in civil engineering. A good-quality concrete provides a highly alkaline environment that forms a passive film on steel bar surface, preventing the reinforcing steel bar from corroding. Under a chloride attack or concrete carbonization, corrosion of embedded reinforcement in concrete is common for RC structures. If the corroded RC structures, such as bridges, are subjected to alternate loads, much importance should be attach to their fatigue. Followed along with the aging of bridge structures, the increase of traffic volumes, the augment of vehicle loads as well as the deterioration of service environment, many corroded RC bridges are urgently needed security appraisal and residual fatigue life forecast. Essentially, fatigue of corrosion reinforcement is a key problem for corroded RC bridges. But the interrelated research is few. To reasonably assess the residual fatigue life of aged existing RC bridges, a little work is done by us. Based on the most new study information, the production on fatigue of corrosion reinforcement is listed and analyzed, and the problems on fatigue of corrosion reinforcement are indicated. This research work provides necessary basis for the deterioration of the fatigue life of aged existing RC bridges.