塩化物を含んだコンクリート中の鉄筋腐食速度に関する屋外暴露実験

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This paper reports the results of 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 (O〜1.0%/sand), water-cement ratio (50〜65%), and thickness of concrete cover (15〜40mm). It is concluded that the rate of corrosion decreases in inverse proportion to square root of thickness of concrete cover, and presented by exponential of sodium chloride content and water-cement ratio. The following estimation equation of the rate of corrosion are proposed. q_<50-55>=0.0926 e^<[{0 2085(W/C)-7 7754}(MaCl)]>C^<-0 5> {50%≦(W/C)≦55%} q_<55-65>=0.0926 e^<[{0 0387(W/C)+1 5733}(NaCl)]>C^<-0 5> {55%<(W/C)≦65%} Where q : rate of corrosion (%/year) C : thickness of concrete cover(mm) NaCl : sodium chloride content(wt%/sand) W/C : water-cement ratio(%)
社団法人日本建築学会の論文
2000-10-30