Corrosion Protection Performance of Epoxy-Coated Reinforcing Bars

Available Documents
Final Report

Primary Investigator
Jose Pincheira
University of Wisconsin-Madison
2312 Engineering Hall
1415 Engineering Drive
Madison, WI 53706

Project Objective
The main purpose of this investigation is to assess the corrosion performance of epoxy-coated reinforcing bars in four bridge decks over a period of time of approximately 30 years. The data obtained in this study will be compared with data obtained approximately 10 years ago to identify the progression of corrosion of epoxy-coated bars in the long term. This project will provide a unique opportunity to measure and track the in-situ performance of epoxy-coated bars over the extended period of time under actual operation conditions. The results of this investigation will provide the necessary data to allow the bridge maintenance engineers to estimate the performance of bridge decks with epoxy-coated bars over time, and to develop and improve appropriate bridge deck health and to update ongoing rehabilitation programs.

Project Abstract
In 1996, the Mn/DOT conducted a study to determine the corrosion protection of epoxy-coated reinforcing bars in four bridges built between 1973 and 1978. A follow up investigation is needed to determine the long term performance of epoxy-coated bars to allow the Mn/DOT to estimate the life of bridge decks reinforced with epoxy-coated bars, and to develop appropriate bridge deck protection and rehabilitation measures. The proposed investigation will include field measurements of bar corrosion activity and delamination and laboratory tests to determine carbonation depth, chloride content levels, and other data that can affect the level of corrosion activity induced in the bars. Field and laboratory data obtained in the study will be combined with those obtained in the 1996 study to assess and develop corrosion trends for the epoxy-coated bars in the decks.

Task Descriptions

  1. Site Inspection and Delamination Survey
  2. Electrochemical Impedance Spectroscopy and/or Half-Cell Potential Measurements
  3. Retrieval of Core Samples
  4. Laboratory Tests
  5. Analysis of Field and Laboratory Data
  6. Draft Final Report

Project Information

  • Milestones, Dates: Duration: 16 months, September 2006 to December 2007
  • Budget: $59,288
  • Student Involvement One graduate student
  • Modal Orientation: Highway
  • Project ID: 07-08