Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지
DOI QR코드

DOI QR Code

Examination on Required Cover Depth to Prevent Reinforcement Corrosion Risk in Concrete

  • Yoon, In-Seok (Dept. of Construction Info. Eng., Induk University)
  • Received : 2012.04.26
  • Accepted : 2012.10.16
  • Published : 2012.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

In first experiment series, this paper is devoted for examining progress of reinforcement corrosion due to carbonation in concrete and to quantify uncarbonation depth to protect reinforcement from corroding. The tolerance of cover depth should be considered in order to prevent carbonation-induced corrosion. From the relationship between the weight loss of reinforcement and corrosion current density for a given time, therefore, the tolerance of cover depth to prevent carbonation-induced corrosion is computed. It is observed that corrosion occurs when the distance between carbonation front and reinforcement surface (uncarbonated depth) is smaller than 5 mm.As a secondary purpose of this study, it is investigated to examine the interaction between carbonation and chloride penetration and their effects on concrete. This was examined experimentally under various boundary conditions. For concrete under the double condition, the risk of deterioration due to carbonation was not severe. However, it was found that the carbonation of concrete could significantly accelerate chloride penetration. As a result, chloride penetration in combination with carbonation is a serious cause of deterioration of concrete.

Keywords

References

  1. J. P. Broomfield, Corrosion of Steel in Concrete, 2nd ed., London, 78 (1997).
  2. Y. F. Houst, P. E. Roelfstra, and F. H. Wittman, Proc. Int. Col. on Mat. Sci. and Restoration, RILEM, 235 (1983).
  3. S. Kang, S. Hong, and M. Kim, Corros. and Protect, 3 (2004).
  4. S. Nagataki, H. Ohga, and E. K. Kim, ACI SP 91-24, 342 (1996).
  5. ASTM G1-72, 440 (1979).
  6. JSCE, Concrete Standard Specification (in Japanese), Part of Durability, 221 (1999)
  7. The Report of the JCI Committee on Carbonation, Japan Concrete Institute, 105 (1993)
  8. D. W. S. Ho and R. K. Lewis, ACI, Detroit, USA (1983).
  9. S. E. Hussain, I. S. Paul, and H. M. Ruthaiyea, Evaluations and Repair Strategies for Shallow Foundations, Proceedings of 6th Middle East Corrosion Conference, Haifai, Israel (1994).
  10. RILEM REPORT 12, Performance Criteria for Concrete Durability, E & FN SPON, 98 (1995).
  11. V. G. Papadakis, C. G. Vayenas, and M. N. Fardis, ACI Materials Journal, 88, 2 (1991).
  12. CEB Bulletin d'Information No 238, New Approach to Durability Design (1997).
  13. Y. F. Houst and F. H. Wittmann, Cement Concr Res., 32, 28 (2002).
  14. A. Müller and G. Sickert, Concrete Precasting Plant and Technology 11, Chapman Hall (1995)
  15. J. P. Broomfield, J. Rodriguez, L. M. Ortega, and A. M. Garcia, ACI Special Publication 151 (1994).
  16. K. Kishitani, K. Kobayashi, N. Kashino, and Y. Uno, Concr Res Tech, 2, 77 (1991). https://doi.org/10.3151/crt1990.2.1_77
  17. Concrete Standard Specification, Part of Durability, JSCE (1999).
  18. K. Kobayashi, R. Siraki, and K. Kawai, Concr Res Tech, 1, 2 (1990)
  19. RILEM Report Technical Committee 60-CSC, P. Schie${\ss}$l (Eds.), E & FN SPON (1988).