| In this paper, chloride ion contents in two concrete bridges are reviewed to discuss the inspection method for concrete bridges in coastal area. In the case of Atsumigawa-bashi Bridge, 80 core samples were taken and chloride ion distribution in each core was measured to discuss the ingress of chloride ions in different sections. In the case of Koyataro-bashi Bridge, chloride ion distributions at different time were compared to discuss the long term behaviour of ingress of chloride ions. As a result, it is confirmed that small difference in the inspected location can widely affect the appraisal of structures. Data also show the residual time before re-bars start to corrode will be controlled by the diffusion coefficient of chloride ions more than the chloride ion content on the concrete surface. |
