The objective of this research project was to evaluate, under service conditions, the concept of cathodic protection on an existing bridge in Idaho. The project consisted of replacing old bridge rail, curbing and wingwalls with new aluminum handrail and installation of the cathodic protection system on two 37' X 150' structures. The first major problem developed when the plant mix overlay was placed over the secured aluminum grid. The temperature of the plant mix caused the aluminum grid to expand and buckle above the deck. This lifted the plant mix overlay off of the deck and caused excessive cracking in the overlay during and after rolling. Some of the grid system had to be cut and removed to allow room for expansion and proper deck repair. During the winter months, water penetrated the overlay destroying the bond between the deck and the overlay. This caused breakup and ravelling of the overlay resulting in extensive patching and sealing the following spring. Sometime after the project shut down for the winter, the traffic on the structures worked the anchor studs loose and the steel joint angles had to be removed. Installation of lates 4" X 2" and joint repair work under the steel joint angles had to be done by change order the following spring. This report also contains detailed cost data of the cathodic protection and of the traffic control.

  • Corporate Authors:

    Idaho Transportation Department

    3311 W State Street, P. O. Box 7129
    Boise, ID  United States  83707-1129
  • Authors:
    • Hazen, G
    • VAN OVER, L E
  • Publication Date: 1980-5

Media Info

  • Features: Appendices; Photos;
  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00324525
  • Record Type: Publication
  • Report/Paper Numbers: Project 76-02-13 Intrm Rpt.
  • Created Date: May 21 1981 12:00AM