For the application to port reinforced concrete structures under marine environment,corrosion-resistant property of three types of stainless steel bars (SUS430, SUS304 and SUS316) in concrete was studied.
　Results obtained are as follows.
1. Three types of stainless steel bars (SUS 430，SUS304，SUS316) had high corrosion-resistant property in concrete under marine environment. The chloride threshold level for corrosion (Clim) of these stainless steels was much higher than that of carbon steel bars. For SUS430, Clim was higher than 14.2 kg/m3. For SUS304, Clim was higher than 12.0 kg/m3. For SUS316, Clim was higher than 14.5 kg/m3.
2. The upper limit of crack width for corrosion in case of stainless steel reinforcement can be increased than that in case of carbon steel bar.
3. In case that stainless steel bar is applied to port concrete structures under marine environment, the life cycle cost can be lower than the case of carbon steel bar.