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Service-life Prediction of Reinforced Concrete Structures in Subsurface Environment
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 Title & Authors
Service-life Prediction of Reinforced Concrete Structures in Subsurface Environment
Kwon, Ki-jung; Jung, Haeryong; Park, Joo-Wan;
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 Abstract
This paper focuses on the estimation of durability and service-life of reinforced concrete structures in Wolsong Low- and intermediate-level wastes Disposal Center (WLDC) in Korea. There are six disposal silos located in the saturated environment. The silo concrete is degraded due to reactions with groundwater and chemical attacks, and finally it will lose its properties as a transport barrier. The infiltration of sulfate and magnesium, leaching of potassium hydroxide, and chlorine induced corrosion are the most significant factors for degradation of reinforced concrete structure in underground environment. From the result of evaluation of the degradation time for each factor, the degradation rate of the reinforced concrete due to sulfate and magnesium is , and it is estimated to take 48,000 years for full degradation while potassium hydroxide is leached in depth of less than 1.5 cm at 1,000 years after the initiation of degradation. In case of chlorine induced corrosion, it takes 1,648 years to initiate corrosion in the main reinforced bar and 2,288 years to reach the lifetime limit of the structural integrity, and thus it is evaluated as the most significant factor.
 Keywords
Radioactive waste;Disposal;Engineered barrier;Concrete degradation;Numerical analysis model;Service life;Steel corrosion;
 Language
Korean
 Cited by
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