지중 환경하에서의 철근콘크리트 구조물의 열화인자별 한계수명 평가

• Published in: Journal of nuclear fuel cycle and waste technology (Online) Vol. 14; no. 1; pp. 11 - 19
• Main Authors: 권기정, 정해룡, 박주완, Kwon, Ki-jung, Jung, Haeryong, Park, Joo-Wan
• Format: Journal Article
• Language: Korean
• Published: 한국방사성폐기물학회 31.03.2016
• Subjects: 원자력공학; Radioactive waste; Numerical analysis model; Service life; Concrete degradation; Disposal; Engineered barrier; Steel corrosion
• ISSN: 1738-1894; 2288-5471
• DOI: 10.7733/jnfcwt.2016.14.1.11

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 $1.308{\times}10^{-3}cm/yr$, 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.