経年建築物におけるコンクリートの中性化と鉄筋の腐食

概要

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Concrete carbonation and reinforcement corrosion in 95 reinforced concrete buildings were investigated and the various factors and the effects were analyzed. The main results are summarized as follows. 1) The distribution of carbonation depth was close to a normal distribution and the average coefficiant of variation was 40 %. 2) In case of no-finishing, carbonation depth was greater indoors than outdoors, the ratio being 1.7. 3) The influence of finishing materials on carbonation rate was considerable, 4) The distribution of cover thickness of reinforcing steel was close to a normal distribution and the average standard deviation was 15 mm. 5) The steel does not corrode in non-carbonated zone. But when carbonated zone has reached the reinforcement, the steel starts to become corroded. 6) Outdoors, when the crabonated zone reaches a reinforcement, the steel starts to become corroded rapidly, but indoors, even when the carbonated zone has reached the reiaforcement, the corrosion does not occur rapidly, the harmful condition being when the carbonated zone goes beyond the cover thickness by 20 to 30 mm. 7) Finishing materials does not affect on the corrosion of reinforcement. 8) In carbonated zone, the reinforcing steel becomes corroded as cover thickness becomes smaller.
社団法人日本建築学会の論文
1989-12-15