One of the most serious and costly problems presently facing highway agencies in many parts of the country is premature deterioration of concrete bridge decks. The major cause has now been linked to deicing chemical "chloride" induced corrosion of the reinforcement. In some cases, bridge decks designed to last 40 years have required major repairs after only 10 years of service due to corrosion related "chuckholing" or spalling. The Minnesota Department of Transportation has become increasingly aware of this problem during the last six years and has initiated a comprehensive program to resolve it. The two basic approaches being used to try and solve the problem are: Keep the salt and moisture out of the decks with protective overlays and membranes, modified concretes or sealers. Protect the steel from corrosion once the concrete's protective nature has been destroyed by chloride contamination, using epoxy coated and galvanized rebars. Bridge decks were constructed or reconstructed using protective membranes, modified concretes and coated bars. Testing and evaluation of field performance consists of visual observations, delamination detection, chloride content determinations, checking depth of concrete cover over rebars and electrical potential measurements. /FHWA/

  • Supplemental Notes:
    • Co-sponsored by the Minnesota Local Road Research Board.
  • Corporate Authors:

    Minnesota Department of Transportation

    Transportation Building, 395 John Ireland Boulevard
    St Paul, MN  United States  55155
  • Authors:
    • Tracy, R G
  • Publication Date: 1977-12

Media Info

  • Pagination: 66 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00195952
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-MN-79-2 Intrm Rpt.
  • Contract Numbers: Inv. No. 639
  • Created Date: Sep 15 1979 12:00AM