Abstract
Exposure tests of concrete in marine environments were conducted over a period ten years to establish the rational design considered durability of concrete structures. In this tests, penetration of chloride ions, corrosion of reinforcing bar and quality change of concrete were investigated. The following result were obtained. (1) Chloride ion distribution can be predicted by using the chloride ion diffusion coefficient (Dc) and surface chloride ion density (Co) obtained from exposure tests. (2) The rate of chloride ion penetration in marine environments is fastest in the splash zone, followed by submerged and atmospheric zones. (3) In marine environments, properly treated construction joints and cracks under 0.05mm to 0.1mm in width do not significantly expedite the reinforcement corrosion in this experiment up to 10 years of exposure.
