EPOXY COATINGS FOR CORROSION PROTECTION OF REINFORCING STEEL IN CONCRETE STRUCTURES. A LITERATURE REVIEW

EPOXIBELAEGGNINGAR SOM KORROSIONSSKYDD AV ARMERINGSSTAAL I BETONGKONSTRUKTIONER. LITTERATURUNDERSOEKNING

In Sweden, interest in the use of epoxy-coated reinforcing steel in concrete structures exposed to aggressive environments, e.g. road salts or salt water, has increased considerably, as costs have risen for repairing concrete bridges damaged by corroding reinforcing steel. This literature survey shows the extent to which epoxy coatings are used for corrosion protection of reinforcing steel in concrete structures, and indicates requirements for epoxy-coated reinforcing steel. The literature survey leads to the following conclusions: (1) in the USA, an increased use of epoxy-coated reinforcing steel in aggressive environments has reduced the amount of corrosion damage on reinforced concrete structures; (2) 15 years' experience of the use of epoxy-coated reinforcing steel in the USA shows that the life-span of the structures can be increased considerably; (3) epoxy powder coatings achieved by electrostatic spraying, with a thickness of 130-300 micrometer in most cases meet the requirements of an organic coating for reinforcing steel in concrete; (4) Poor pre-treatment of the steel surface worsens the adhesion of the coating, and this leads to an inferior corrosion protection. Blasting gives the best adhesion; (5) the material costs involved in the use of epoxy-coated steel are about 100% higher than with uncoated steel, but the total cost for a finished structure with epoxy-coated steel is about 5-10% higher than that of a structure with uncoated reinforcement; (6) epoxy-coated reinforcing steel must be handled with care so that the epoxy coating is not damaged. Bending should be done at room temperature, and should be carried out more slowly and with a greater bending radius than for corresponding uncoated steel; (7) during repair painting it is important that the damaged surface be cleaned carefully before painting. The guidelines for use as well as the regulations for epoxy paints should be observed, especially for those which contain low-molecular weight epoxy resins. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Cement and Concrete Research Institute

    Drottning Kristinas Vaeg 26
    Stockholm 70,   Sweden 
  • Authors:
    • PETTERSSON, K
    • Sederholm, B
  • Publication Date: 1990

Language

  • Swedish

Media Info

  • Features: References;
  • Pagination: 35 p.
  • Serial:
    • VTI Rapport
    • Issue Number: 2:90
    • Publisher: Swedish National Road and Transport Research Institute (VTI)
    • ISSN: 0347-6030

Subject/Index Terms

Filing Info

  • Accession Number: 00619742
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1992 12:00AM