서울시내 콘크리트 교량 바닥판의 제빙화학제 살포로 인한 염소이온 침투의 확률 해석
Probabilistic Analysis on Deicing Salt Penetration of Concrete Bridges Decks in Seoul Metropolitan Area
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본 연구는 서울시에 위치한 콘크리트 교량 바닥판의 제빙화학제로 인한 열화속도를 추정하기 위하여 제빙화학제 사용현황을 조사하고, 실구조물 조사에 의한 표면 염소이온량 누적정도와 염소이온 확산계수의 확률 분포적 특성을 고려하여 국내 환경에 적합한 내구수명 예측을 수행하였다. 연구결과, 무작위성을 나타내는 표면 염소 이온량과 염소이온 확산계수는 각각 규모 매개변수 0.192, 29.828, 형상 매개변수 7.899, 1.983을 갖는 gamma 분포가 형성되었다. 표면 염소이온량은 평균 1.5kg/m3이며 약 70%의 확률수준에서 1～2kg/m3까지 농축되었다. 본 연구결과를 종합하여 볼 때, 콘크리트 교량 바닥판의 설계 내구수명이 20년 이상이 되려면 필요한 피복두께는 최소 26mm 이상으로 시공되어야 하는 것으로 나타났다.
Abstract
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 corrode 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 1.5kg/m3 and condenses from 1 to 2kg/m3 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 deicing 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.
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