コンクリート中の鉄筋の発錆実験　その5　－防錆剤添加量が多い場合（実験5）　その1－

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There has been said that the more salt in concrete needs the more dosage of inhibitors in concrete to prevent steels from corrosion. In Okinawa Prefectures, the reinforced concrete structures contain too much quantity of salt in their body concrete, and the serious damages of the structures due to steel corrosion have been prevailing overall the Prefecture. In this series of experiments, over-dosed corrosion inhibitor is contained in concrete to prevent steels from rusting. The experimental factors are salt content and dosage of inhibitor in concrete, and the levels of the former are 0.05, 0.15 and 0.75% of salt by weight of concrete and the levels of latter are two, three and four times as much as standard dosage of inhibitor which the makers specify. The experiments have been done in accordance with so-called "Experimental Design". The two-times-dosage of inhibitor is quite enough to inhibite the corrosion of steels in the concrete containing salt as much as 0.75% by weight. Three-and four-times-dosages are sufficient for preventing steels in the concrete containing as much as 0.15% salt from rusting. But the dosages couldn't inhibite the corrosion of steels in the concrete with 0.75% salt contained. This result seems to be quite strange, but it is concluded as in Experiments 1 that "when there are contained much salt (for instance, over 0.50% by weight of concrete in experiments 1), the more inhibitor exists, the more corrosion of steels results". Up to 9 month after embedding steels in concrete, an two-times-dosage of inhibitor seems to be quite enough for preventing steels in the concrete with 0.75% salt from rusting. The water cement ratio of 50 % may contribute to the above result.

コンクリート中の鉄筋の発錆実験　その5　－防錆剤添加量が多い場合（実験5）　その1－

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コンクリート中の鉄筋の発錆実験 その5 －防錆剤添加量が多い場合（実験5） その1－

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コンクリート中の鉄筋の発錆実験　その5　－防錆剤添加量が多い場合（実験5）　その1－