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This paper reports the results of long-term outdoor exposure test on the rate of corrosion of reinforcing bar in concrete which contains chloride ion. The factor of experiment are sodium chloride content (0-1.0%/sand), water-cement ratio (50-65%), and thickness of concrete cover (15-40mm).It is concluded as follows, The corrosion loss of reinforcing bar in long-term outdoor exposure test increases in proportion to square root of exposure period. Rate of corrosion of reinforcing bar decreases with increasing thickness of concrete cover in sodium chloride content(0-0.3%/sand). The estimation equation of the rate of corrosion of sodium chloride content(0-1.0%/sand) are proposed by thickness of concrete cover and water-cement ratio.

OUTDOOREXPOSURE TEST ON THE RATE OF CORROSION OF REINFORCING BAR IN CONCRETE CONTAINING CHLORIDE ION