International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

Corrosion Evaluation of Epoxy-Coated Bars by Electrochemical Impedance Spectroscopy

  • Published : 2008.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

Southern exposure test specimens were used to evaluate corrosion performance of epoxy-coated reinforcing bars in chloride contaminated concrete by electrochemical impedance spectroscopy method. The test specimens with conventional bars, epoxy-coated bars and corrosion inhibitors were subjected 48 weekly cycles of ponding with sodium chloride solution and drying. The polarization resistance obtained from the Nyquist plot was the key parameter to characterize the degree of reinforcement corrosion. The impedance spectra of specimens with epoxy-coated bars are mainly governed by the arc of the interfacial film and the resistance against the charge transfer through the coating is an order of magnitude higher than that of the reference steel bars. Test results show good performance of epoxy-coated bars, although the coatings had holes simulating partial damage, and the effectiveness of corrosion-inhibiting additives. The corrosion rate obtained from the impedance spectroscopy method is equivalent to those determined by the linear polarization method for estimating the rate of corrosion of reinforcing steel in concrete structures.

Keywords

References

  1. Uhlig, Herbert H. and Revie, Winston R., "Corrosion and Corrosion Control," An Introduction to Corrosion Science and Engineering, John Wiley & Sons, Inc, New York, 1985, 441 pp
  2. Jones, D. A., Principles and Prevention of Corrosion, Macmillan Publishing Company, New York, NY, 1996, 572 pp
  3. Baidis, J. M. and Rosenberg, A. M., "The Inhibitors of Chloride-Induced Corrosion in Reinforced Concrete by Calcium Nitrite," Cement, Concrete, Aggregates, Vol. 9 No. 1, 1987, pp. 30-33 https://doi.org/10.1520/CCA10394J
  4. ASTM C 109-92, "Standard Test Method for Determining the Effects of Chemical Admixtures on the Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments," 1999 Annual Book of ASTM Standards, Vol. 04.02, American Society for Testing and Materials, West Conshohocken, PA. 1999
  5. Bonanos, N., Steele, B. C. H., Buter, E. P. Johnson, W. B., Worrell, W. L., MacDonald, D. D., and McKubre, M. C. H., Application of Impedance Spectroscopy, Ch. 4, edited J. R. Mac-Donald, Wiley & Sons, NY, 1987
  6. John, D. G., Searson, P. C., and Dawson, J. L., "Use of AC Impedance Technique in Studies on Steel in Concrete in Immersed Conditions," British Corrosion Journal, fl6, 1981, pp. 102-10
  7. Andrade, C., Soler L., Alonso, C., Novoa, X. R., and Keddam, M., "The Importance of Geometrical Considerations in the Measurement of Steel Corrosion in Concrete by Means of AC Impedance," Corrosion Science, Vol. 37, No. 12, 1995, pp. 2013-2023 https://doi.org/10.1016/0010-938X(95)00095-2
  8. Gu, P., Elliot, S., Hristova, H., Beaudoin, J. J., Brousseau, R., and Baldock, B., "A Study of Corrosion Inhibitor Performance in Chloride Contaminated Concrete by Electrochemical Impedance Spectroscopy," ACI Materials Journal, Vol. 94, No. 5, Sep-Oct., 1997, pp. 385-395
  9. Lorentz, T. E., French, C. W., and Leon, R. T., "Corrosion of Coated and Uncoatd Reinforcing Steel in Concrete," Structural Engineering Report No. 92-03, University of Minnesota Center of Transportation Studies, 1992, 204 pp
  10. McDonald, D. B., Pfeifer, D. W., and Sherman, M. R., Corrosion Evaluation of a Epoxy-Coated, Metallic-Clad and Solid Metallic Reinforcing Bars in Concrete, Publication No. FHWA-RD-98-153, Federal Highway Administration, McLean, VA, 1998, 127 pp
  11. ASTM C 876-91, "Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete," 2002 Annual Book of ASTM Standards, Vol. 03.02, American Society for Testing and Materials, West Conshohocken, 2002, PA
  12. Berke, N. S., Shen, D. F, and Sundberg, K. M., "Comparison of the Polarization Resistance Technique to the Macrocell Corrosion Technique," ASTM Special Technical Publication, Symposium on Corrosion Rates of Steel in Concrete, Baltimore, 1990, pp. 38-51
  13. Hope, B. B., Page, J. A., and Ip, A. K. C., "Corrosion Rate of Steel in Concrete," Cement and Concrete Research, Vol. 16, No. 5, 1986, pp. 771-786 https://doi.org/10.1016/0008-8846(86)90051-7
  14. Balma, J., Darwin, D., Browning J, and Locke, C. E, "Evaluation of Corrosion Protection Systems and Corrosion Testing Methods for Reinforcing Steel in Concrete," SM Report 05-1, The University of Kansas Center for Research, Inc., Lawrence KS, 2005, 517 pp
  15. Choi, O. C. and Jung, S. Y., "Corrosion Evaluation of Epoxycoated Bars in Chloride Contaminated Concrete Using Linear Polarization Test," KCI Concrete Journal, Submitted
  16. Pfeifer, D. W. and Scali, M. J., "Concrete Sealers for Protection of Bridge Structures," National Cooperative Highway Research Board Program Report 244, Transportation Research Board, National Research Council, Washington, D. C., 1981, 138 pp
  17. Zhang, J., Monterio, P. J. M., and Morrison H. F., "Noninvasive Surface Measurement of Corrosion Impedance of Reinforcing Bar in Concrete-Part 1: Experimental Results," ACI Materials Journal, V. 98, No. 2, March-April, 2001, pp. 116-125
  18. Gamry, Electrochemical Measurement System Software Installation Manuals, Revision 3.1, Gamry Instruments Inc, 1999
  19. Allyn, M. and Franz G. C., "Corrosion Tests with Concrete Containing Salts of Alkenyl -Substituted Succinic Acid," ACI Materials Journal, Vol. 98, No. 3, May-June, 2001, pp. 224-232
  20. Rodriguez, J,, Ortega, L. M. Garcia, A. M. Johansson, L. and Peterson, K., "On Site Corrosion Rate Measurements in Concrete Structures Using a Device Developed under Eureka Project EU-401," Proc. of International Conf. on Concrete Across Borders, Vol. 1, Odense, Denmark, June, 1994, pp. 171-185

Cited by

  1. Response of Glass Fiber Reinforced Polymer (GFRP)-Steel Hybrid Reinforcing Bar in Uniaxial Tension vol.11, pp.4, 2017, https://doi.org/10.1007/s40069-017-0212-9