オートクレーブ養生と鉄筋の腐食防食に関する研究

概要

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Corrosion hehavior of reinforcement in concrete was investigated in accelerating condition by autoclave-curing with four kinds of the nitrite-type corrosion inhibitors on the Japanese market. The results are summerized as follows : 1) In case of more than 0.1% chloride content, the corrosion of reinforcement increases strikingly, which well agrees with the former results in other accelerating conditions. 2) Corrosion inhibitors are quite effective for prevention of corrosion, but the safety dosage of the inhibitors must be increased in the autoclaving condition. 3) There is not much difference of corrosion behavior of reinforcement in the ordinary concrete, air-entrained concrete, and air-entrained light-weight concrete. 4) Much corrosion was found under the horizontal bars due to condensation of chloride by bleeding and outside the bending bars due to stress corrosion. 5) The autoclaving test as an accelerating method for evaluating the effectiveness of the inhibitors is usable for its purpose in spite of severer condition than ordinary temperature curing. 6) In case of using marine sand for manufacturing autoclaved concrete products the great care must be taken to inhibit corrosion of reinforcement, on which the further and basic investigation is necessary in future.
1981-01-30