Assessment of Corrosion Resistance of Alternative Reinforcing Materials by Salt-Spray Exposure

Solid corrosion resistant and coated conventional reinforcing bars, including stainless steel types 316LN, 2205, 2201 and 3Cr12; a proprietary low-carbon, chromium alloy (ASTM A1035); epoxy-coated both recently produced and 15-year old bars extracted from a northern bridge deck; and zinc-coated (galvanized), were simultaneously exposed to 5 % NaCl solution at 35oC in a salt-spray (fog) apparatus (ASTM B 117) for up to 4 weeks. Conventional carbon steel reinforcing bars were included as a control. The condition of the bars was periodically inspected and weight losses were determined at 1, 2 and 4 weeks. Based on weight loss data, the corrosion resistance of the solid bars was ranked as follows: 316LN and 2205 > 2201 > 3Cr12 and A 1035 > carbon steel. Galvanized bars showed some delay in corrosion of the underlying steel, however, the zinc coating was quickly consumed and the average corrosion rate was comparable to that of carbon steel bars. In contrast, corrosion on all the epoxy-coated bars occurred only at defects and the average weight loss was nearly zero. The relative corrosion resistance ranking of the tested bars is consistent with the results reported more intensive testing regimes. Therefore, this highly accelerated test program provided a simple, quick, and useful comparison of the corrosion resistance of the tested steel reinforcement.

• Supplemental Notes:
  • The title of this paper is listed in the Table of Contents on the CD ROM as Corrosion Performance of Epoxy-Coated Reinforcing Bars in Four Atlantic Bridge Structures.
• Corporate Authors:

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  National Concrete Bridge Council

  Portland Cement Association, 5420 Old Orchard Road
  Skokie, IL  United States  60077-1083

  Missouri Department of Transportation

  105 West Capitol Avenue
  Jefferson City, MO  United States  65102

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Krauss, Paul D
  • DuPont, E I
• Conference:
  • 2008 Concrete Bridge Conference
  • Location: St. Louis MO, United States
  • Date: 2008-5-4 to 2008-5-7
• Publication Date: 2008

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Photos; References; Tables;
• Pagination: 16p
• Monograph Title: HPC: Safe, Affordable, and Efficient

Subject/Index Terms

• TRT Terms: Corrosion protection; Corrosion resistance; Epoxy coatings; Galvanized metals; Material reinforcement; Reinforcing bars; Reinforcing steel; Salts; Seawater; Stainless steel
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01105269
• Record Type: Publication
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jul 29 2008 8:10AM