コンクリート中の鉄筋の腐食に関する研究 : その 2. コンクリートのひびわれが鉄筋腐食に及ぼす影響について

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Cracks produced in concrete will cause active-passive cells to be formed at reinforcing steel in the interior. There are many instances where allowable crack widths have been studied and reported from the viewpoint of durability, and in order to study the results when the influences of chlorides and environmental conditions, and the effect of zinc coating are additionally taken into account for the cases of these reports, outdoor exposure tests were conducted on specimens cracked beforehand. Further, with the aim of confirming the results, repetitive wetting and drying tests were carried out on similar specimens. As a result, the following were clarified : 1. Allowable crack widths for durability when using ordinary concrete and ordinarily-treated reinforcing steel under ordinary environmental conditions are as indicated below. Cases of No Chloride Content W/C=0.45-0.65 0.1mm Cases of Chloride Content W/C=0.50 0.1mm regardless of chloride content W/C=0.60 NaCl=0.04-0.1°/sand 0.1mm NaCl=0.12-0.2°/sand 0.05mm NaCl=0.3°/sand 0.02mm At seashore districts and cold weather regions the allowable limits are roughly the same as above, but in industrial districts (SO_2 concentration 0.05ppm (annual average) or higher), it appears 0.5 times the above values may be considered. Further, the above will be applicable to concrete cover of up to about 80mm. 2. It will be necessary to establish design, mix proportions and work execution methods in accordance with environmental conditions in order to improve durability of reinforced concrete. 3. Zinc coating, if sufficiently sound and uniform, and if well-bonded, may be expected to provide corrosion preventive effect for substrate reinforcing steel.
社団法人日本建築学会の論文
1979-10-30

コンクリート中の鉄筋の腐食に関する研究 : その 2. コンクリートのひびわれが鉄筋腐食に及ぼす影響について

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