FACTORS AFFECTING CATHODIC DISBONDMENT OF EPOXY COATINGS FOR STEEL REINFORCING BARS

Fusion-bonded-epoxy coatings have been used successfully for more than 20 years to prevent corrosion of concrete reinforcing steel. Despite this success, concern has been raised about long-term adhesion retention in severe service environments. New industry standards are aimed at addressing this issue. As new specifications and test programs are instituted for epoxy-coated rebar, it is necessary to understand the factors that affect test performance. A number of systems are available to meet the new industry requirements, including chromate and non-chromate surface treatments, coatings for prefabricated rebar, and developmental coatings that combine bendability and good adhesion retention. However, choosing a high quality coating system may not ensure maximum performance. Various other factors affect the cathodic-disbondment resistance of ECR. The application temperature and thickness of the coating, and steel surface preparation and contamination play significant roles. If a surface treatment is used, the amount of treatment applied is important. Finally, the test conditions of time, temperature, and pH have a dramatic impact on the cathodic-disbondment test results for a given system.

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • MCHATTIE, J S
    • PEREZ, I L
    • KEHR, J A
  • Publication Date: 1996

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726624
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 28 1996 12:00AM