Abstract
Reinforced concrete structures in coastal area are dereriolated by various factors such as Cl- penetration and carbonic acid gas. In this paper, dereriolation characteristics of reinforced concrete structures located on seaside and land were evaluated by surveying the condition of reinforcing bar corrosion in thermal power stations placed in Seto Inland Sea where the width of tide level is over 3m. As the results, it was realized that the main factor of reinforcing bar corrosion is different between marine strutures and land structures; Marine structures' reinforcing bar could be in the corrosion condition after 15 years of their construction mainly because of Cl- permeation in marine strutures. On the other hand, that of land structures could corrode after 25 years of their construction by carbonation since their covering depth tend to be thin. These estimations are considerablely conservative, but could be used as standard index of considering maintainance time in Seto Inland Sea.
