コンクリート中の鉄筋の発錆実験　その4　－1年半と2ヶ年時点　その2（実験2）－

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This is the 4th report of the series of experiments which the authors have been undertaken on the subject of steel corrosion in concrete. The test results and their investigations at one and half year and two years after embedding the steels in concrete are described. This series of experiments consists of nine experiments on accordance with L_9(3^4) Table of "Experimental Design". Salt contents in concrete, types of corrosion inhibitors and dosages of inhibitors are main factors in the experiments. All the factors have three levels, heating the specimens or not is also a main factor in the experiments. The following facts are clarified in the study. (1) Heating the specimens at 50℃ for one hour and sinking them into water for two hours per day have an accelarating effect on corrosion of steels in concrete. (2) The effect of types of inhibitors on corrosion of steels is not so clear, if any, the total areas of corrosion due to the difference of types are becoming equalized as the time has passed. (3) The influence of salt contents in concrete on corrosion of steel has been overwhelmingly strong, it results in that the more salt content in concrete bring about the more corrosive areas on steel surface. (4) The influence of dosages of inhibitors couldn't be appreciated because of interaction between the salt content and the dosage of inhibitor. So, the corrosion preventing effect of inhibitor must be mentioned in connection with salt content. (5) The cracks on concrete surfaces due to steel corrosion have become strong effect on the rate of steel corrosion at the time when two years have passed after embedding.

コンクリート中の鉄筋の発錆実験　その4　－1年半と2ヶ年時点　その2（実験2）－

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コンクリート中の鉄筋の発錆実験 その4 －1年半と2ヶ年時点 その2（実験2）－

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コンクリート中の鉄筋の発錆実験　その4　－1年半と2ヶ年時点　その2（実験2）－