SURVEY OF HIGHWAY BRIDGES CONTAINING GALVANIZED REBAR

In this paper the results are reported of an ILZRO (International Lead Zinc Research Organization) sponsored survey carried out by the Construction Technology Laboratories, Inc. to compare the performance of galvanized and uncoated rebars in bridge decks after periods of up to 24 years. The bridges surveyed have been exposed to sea water or deicing salts and are located in Iowa, Florida and Pennsylvania. The condition of the rebars and concrete was evaluated using visual, electrochemical, petrographic and metallographic techniques. Generally the galvanized rebars were found to have suffered only superficial corrosion in sound uncracked concrete. Deterioration of the bridge decks resulting from localized rebar corrosion was associated with a low depth of concrete cover and/or the use of poor quality concrete. The average thickness of the galvanized coating remaining on the rebar was found to be in excess of 85 microns. (A) For the covering abstract see IRRD 867793.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 157-70

Subject/Index Terms

Filing Info

  • Accession Number: 00675058
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-85075-723-2
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM