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Prediction of Time to Corrosion for Concrete Bridge Decks Exposed to De-Icing Chemicals
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 Title & Authors
Prediction of Time to Corrosion for Concrete Bridge Decks Exposed to De-Icing Chemicals
Lee, Chang-Soo; Yoon, In-Seok; Park, Jong-Hyok;
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The major cause of deterioration for the concrete bridge decks exposed to de-icing chemicals would be chloride-induced reinforcement corrosion. Thus, in this paper, in order to predict time to corrosion for concrete bridge decks in the urban area, chloride concentration was measured with depth from the surface. A frequency analysis on surface chloride concentration and chloride diffusion coefficient of concrete bridge deck equals 0.192, 29.828 in the scale parameter and 7.899, 1.983 in the shape parameter of gamma distribution. The average value of surface chloride concentration equals 1.5 kg/㎥ and condenses from 1 to 2 kg/㎥ in the level of probability 70%. From the probabilistic results, it is confirmed that 26mm of minimum cover depth in order to target 20 years over is calculated. The countermeasure strategy to extend the service life of concrete bridge deck exposed to de-icing chemicals would be an effective method to increase cover depth and to place high performance concrete, which could lead to reduce the chloride diffusion coefficient and distribution range.
de-icing chemicals;concrete bridge deck;service life prediction;surface chloride concentration;chloride diffusion coefficient;
 Cited by
중성화와 염해를 고려한 콘크리트의 복합열화 예측,이창수;윤인석;

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동절기 제설제 사용에 대한 고속도로 교량의 내구수명 평가,;;;;;

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