Service-life Prediction of Reinforced Concrete Structures in Subsurface Environment

지중 환경하에서의 철근콘크리트 구조물의 열화인자별 한계수명 평가

  • Received : 2015.11.02
  • Accepted : 2015.12.28
  • Published : 2016.03.30


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.


Radioactive waste;Disposal;Engineered barrier;Concrete degradation;Numerical analysis model;Service life;Steel corrosion


  1. Belgian agency for radioactive waste and enriched fissile materials (ONDRAF/NIRAS), Time dependence of the geochemical boundary conditions for the cementitious engineered barriers of the Belgian surface disposal facility, NIROND-TR 2008-24E, June (2009).
  2. J.C. Walton, L.E. Plansky, and R.W. Smith, "Models for Estimation of Service Life of Concrete Barriers in Low=level Radioactive Waste Disposal", U.S. Nuclear Regulatory Commission (NRC), NUREG/CR-5542, September (1990).
  3. U.S. Nuclear Regulatory Commission (NRC), The U.S. Department Of Energy Idaho National Laboratory Site DraftSection 3116 Waste Determination For Idaho Nuclear Technology And Engineering Center Tank Farm Facility. U.S. Department of Energy, Idaho Operations Office. No report number. Appendix E. Degradation Analysis of the Grouted Tank/Vault and Piping System at the Idaho Nuclear Technology and Engineering Center Tank Farm Facility And Preliminary Results for the Detailed Analysis of Releases from the Grouted Pipe and Encasement System (2006).
  4. National Council on Radiation Protection and Measurements (NCRP), "Performance Assessment of Low- Level Waste Disposal Facilities", Report 152, Bethesda (2005).
  5. S. Kumar and C.V.S.K. Rao, "Sulfate Attack on Concrete in Simulated Cast-in-situ and Precast Simulations", Cement and Concrete Research, 25, 1-18 (1995).
  6. J.G. Wang, "Sulfate Attack on Hardened Cement Paste", Cement and Concrete Research, 24, 735-742 (1994).
  7. Korea Radioactive Waste Agency, "Durability evaluation of silo concrete in Low- and Intermediate-Level Wastes (LILW) disposal facility", '14116-K-TR-001 (2013).
  8. A. Atkinson and J.A. Hearne, "Mechanistic models for the durability of concrete barriers exposed to sulfatebearing groundwaters", in Scientific Basis for Nuclear Waste Management XIII, V.M. Oversby and P.W. Brown eds., MRS Symposium Proceedings, 176, 149-156, Nov 26-Dec 2, Boston (1990).
  9. Korea Electronic Power Research Institute (KEPRI), "Prediction the remaining life of concrete structure", '01KEPRI-265 (2001).
  10. The European Union, EuroLightCon, "Chloride penetration into concrete with lightweight aggregate", Document BE96-3942/R3 (1999).
  11. Korea Concrete Institute (KCI), Standard concrete Specification, 637-671, KCI (2009).
  12. Y.H. LI and S. Gregory, "Diffusion of ions in sea water and in deep-sea sediments", Geochemical et Cosmochemica Acta, 38, 703-705 (1974).
  13. K.A. Snyder and J.R. Clifton, "4SIGHT Manual: a computer program for modelling degradation of underground low level waste concrete vaults", National Institute of Standards and Technology (NIST), NISTIR 5612 (1995).
  14. Y.H. Li and S. Gregory, "Diffusion of ions in sea water and in deep-sea sediments", Geochemical et Cosmochemica Acta, 38, 710-714 (1974).
  15. R.A. Freeze and J.A. Cherry, Groundwater, 2nd ed., 604, Englewood Cliff, NJ, Prentice Hall (1979).
  16. Korea Concrete Institute (KCI), "Review of KORAD engineered barrier degradation analysis", 14116-KTR-004 (2011).
  17. J.P. Simson, "Experiments on container materials for Swis high-level waste disposal projects", Nagra, Part-IV Nagra NTB 89-19 (1989).
  18. H.W. Song, S.W. Park, and K.Y. Ann, "Probabilistic assessment to predict the time to corrosion of steel in reinforced concrete tunnel box exposed to sea water", Construction and Building Materials, 23, 3270-3278 (2009).
  19. U.S. Nuclear Regulatory Commission (NRC), "Models for Estimation of Service Life of Concrete Barriers in Low-Level Radioactive Waste Disposal", NUREG/ CR-5542 (1990).
  20. H. Jung, K.J. Kwon, E. Lee, D.G. Kim, and G.Y. Kim, "Effect of dissolved oxygen on corrosion properties of reinforcing steel", Corrosion Engineering, Science and Technology, 46, 195-198 (2011).
  21. K.Y. Ann and J.S. Ryou, "The importance of chloride content at the concrete surface in assessing the time to corrosion of steel in concrete structures", Construction and Building Materials, 23, 239-245 (2009).


Supported by : 한국에너지기술평가원(KETEP)