원자력발전소 콘크리트 구조물의 황사염 침식 평가
Evaluation on Sulfate Attack for Concrete Structures of Nuclear Power Plants
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초록
황산염에 의한 원전 콘크리트 구조물의 침식을 예측하기 위하여 경과시간에 따른 팽창응력, 확산계수 등을 종합적으로 고려할 수 있는 Mechanistic 모델을 적용하였다. 적용배합은 원전 구조물 건설에 사용되었던 설계기준강도 385, 280 및 210 kgf/cm2의 3종으로 하였으며, 1종과 5종 포틀랜드시멘트를 사용하였다. 또한, 시멘트 종류 및 설계기준강도별로 1년간 10% 황산나트륨 용액에서 침지실험을 실시하여 각 배합별 확산계수 및 압축강도를 구하였으며, 그 결과를 예측모델식에 사용하여 원전 콘크리트 구조물의 황산염 침식을 예측하였다. 대상 배합의 황산염 확산계수는 0.5763～3.9002×10-12m2/sec.였으며, 원전 콘크리트 구조물의 황산염 침식속도는 0.1～7.1 mm/year로 예측되었다.
Abstract
The Mechanistic model, considering expansion stress, coefficient of diffusion etc. to time, is applied to predict the deterioration of concrete structures of the nuclear power plant(NPP) due to sulfate attack. Mix design for the test was three kinds of specified compressive strength 385, 280 and 210 kgf/cm2 which are used to construct NPPs and cement was type I and V. The immersion test was performed with 10% Na2SO4 solution to cement type and strength for a year. The coefficient of diffusion on each concrete mix is calculated based on the results of immersion test, and it is used for predicting the sulfate attack of the concrete structures of NPP. The coefficient of diffusion of the target concrete ranged 0.5763～3.9002×10-12m2/sec., and the sulfate attack rate of concrete structures of the NPP was predicted as 0.1～7.1 mm/year.
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