DOI QR코드

DOI QR Code

Corrosion Evaluation of Epoxy-Coated Bars in Chloride Contaminated Concrete Using Linear Polarization Tests

  • Published : 2006.06.30

Abstract

Five slab specimens with predefined cracks are examined to evaluate the corrosion behavior of epoxy-coated bars in chloride contaminated concrete, using linear polarization method. The test specimens were subjected to alternating weekly cycles of ponding in a salt solution and drying for 48 weeks. Test results show that the current density of the specimen of normal steel bars becomes 0.715 ${\mu}A/cm^2$ indicating that the steel bars are in moderate or high corrosion condition. However, the corrosion rates of the specimens with damaged epoxy-coated bars are significantly below 0.1 ${\mu}A/cm^2$ and the bars appears to be in passive condition. The damaged epoxy-coated bars with a corrosion inhibitor of calcium nitrite showed a corrosion rate of 0.110 ${\mu}m/year$ or 56 percents of the corrosion rate of damaged epoxy-coated specimen without such an inhibitor, 0.195 ${\mu}m/year$. However, the corrosion rates of specimens containing the other two corrosion inhibitors, a combination of amines and esters or mixtures of organic alkenyl dicarboxyl acid salts are quite equivalent to the control specimen. The research technique of linear polarization resistance method has proven itself to be useful in measuring corrosion rates of reinforcement in concrete.

Keywords

References

  1. Uhlig, H. H. and Revie, W. R., Corrosion and Corrosion Control, An Introduction to Corrosion Science and Engineering, John Wiley & Sons, Inc, New York, 1985, 441pp
  2. Baidis, J. M. and Rosenberg, A. M., 'The Inhibitors of Chloride-Induced Corrosion in Reinforced Concrete by Calcium Nitrite,' Cement, Concrete, Aggregates, Vo1.9 No.l, 1987, pp.30-33
  3. ASTM C 109-92a, Standard Test Method for Determining the Effects of Chemical Admixtures on the Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments, 1994 Annual Book of ASTM Standards, Vol.4, No.2, American Society for Testing and Materials, West Conshohocken, PA, 1994, pp.113-119
  4. Lorentz, T. E., French, C. W. and Leon, R. T., Corrosion of Coated and Uncoated Reinforcing Steel in Concrete, Structural Engineering Report No. 92-03, University of Minnesota Center of Transportation Studies, 1992, 204pp
  5. 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. FHWARD-98-153, Federal Highway Administration, McLean, VA, 1998, 127pp
  6. ASTM C 876-91, Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete, 1994 Annual Book of ASTM Standards, Vol4, No.2, American Society for Testing and Materials, West Conshohocken, PA, 1994, ppA32-437
  7. Jones, D. A., Principles and Prevention of Corrosion, Macmillan Publishing Company, New York, NY, 1996, 572pp
  8. 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
  9. Hope, B. B., Page, J. A. and lp, 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
  10. Balma, 1., Darwin, D., Browning 1. 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, 517pp
  11. 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, 138pp
  12. Zhang, J., Monterio, P. 1. M. and Morrison H. F., 'Noninvasive Surface Measurement of Corrosion Impedance of Reinforcing Bar in Concrete-Part 1: Experimental Results,' ACI Materials Journal, Vol.98, No.2, March-April, 2001, pp.116-125
  13. Gamry, Electrochemical Measurement System Software Installation Manuals, Revision 3.1, Gamry Instruments Inc. 1999
  14. Allyn, M. and Franz G C., 'Corrosion Tests with Concrete Containing Salts of AlkenyI -Substituted Succinic Acid,' ACI Materials Journal, Vol.98, No.3, May-June, 2001, pp.224-232
  15. 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