Corrosion of Fastners in Wood Treated with Newer Wood Preservatives for Potential Rehabilitation of Covered Bridges

Metallic fasteners have been used in covered bridges for centuries and have performed well in untreated timbers. However, durability concerns during rehabilitation of these historic structures typically dictate the use of treated wood. Because of environmental considerations, effective wood preservatives that have been used for many years are being replaced with a newer wood preservative, such as alkaline copper quaternary (ACQ) and copper azole (CuAz), that are showing accelerated corrosive effects on iron fasteners.


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    • Status: Active
    • Contract Numbers:


    • Sponsor Organizations:

      National Center for Wood Transportation Structures

      Iowa State University, 2711 S Loop Srive
      Ames, IA  United States  50010
    • Performing Organizations:

      Forest Products Laboratory

      P.O. Box 5130, North Walnut Street
      Madison, WI  United States  53705
    • Principal Investigators:

      Zelinka, Samuel

    • Start Date: 20090000
    • Expected Completion Date: 0
    • Actual Completion Date: 20110000
    • Source Data: RiP Project 28047

    Subject/Index Terms

    Filing Info

    • Accession Number: 01463702
    • Record Type: Research project
    • Source Agency: National Center for Wood Transportation Structures
    • Contract Numbers: RIP-4723-010
    • Files: RIP
    • Created Date: Jan 3 2013 2:28PM