This paper reports about experimental and analytical results carried on in order to obtain data for judgment if we can improve the durability of reinforced concrete by stopping, delaying or suppressing the progress of corrosion of reinforcing steel in neutralized concrete by surface treatment after the considerable progress of neutralization of concrete. Experiments of 16 month-accelerated corrosion test and 11 year-outdoor and indoor exposure tests for test specimens of reinforced concrete treated with various surface finishing matherials after 5 month-accelerated carbonation were carried on. Suppressive effects of surface finishing materials on corrosion of reinforcing steel in neutralized concrete have been quantitatively evaluated both by power law and by the general parabolic law involving a constant term concerning time. A concept of equivalent ratio of corrosion weight loss causing crack is proposed based upon these suppressive effects of surface finishing materials.
