Investigation on the effect of various factors on the rate of corrosion of reinforcing bar in concrete and estimation of the life of RC buildings

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The 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 conclude 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 decrease 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 are proposed by thickness of concrete cover and water cement ratio.