RC造建築物における鉄筋腐食速度に及ぼすコンクリート中の塩化物量の影響

概要

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This paper analyzes the influence of chloride content, thickness of concrete cover, carbonation and finished materials on the rate of corrosion loss of reinforcing bar based on the investigation results of 45 existing buildings using sea sand or standing near sea. The age of investigated building is between 7 years and 46 years, and most of them is between 10 years and 20 years. The number of investigation points is 171, and the number of reinforcing bar is about 800. The result of analysis are briefly described as follows. (1) Finished material, such as mortar, is effective on inhibiting corrosion, and the half of thickness of mortar may be included in the thickness of concrete cover. (2) The rate of corrosion loss increases as the chloride content increases, and inversly, as the thickness of concrete cover decreases. (3) The rate of corrosion loss is under 0.05 %/year when the chloride content is under 0.015 % and the thickness of concrete cover is over 20 mm. (4) The rate of corrosion loss is about 0.1 %/year when the chloride content is 0.03-0.06 % and the thickness of concrete cover is 20-60 mm. (5) The rate of corrosion loss is over 0.15 %/year when the chloride content is over 0.06 % in spite of the thickness of concrete cover is over 60 mm. (6) The rate of corrosion loss in carbonated zone is larger than that in uncarbonated zone.
社団法人日本建築学会の論文
1988-01-30