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Investigation of field corrosion performance and bond/development length of galvanized reinforcing steel.

File Language:
English


Details

  • Creators:
    Phares, Brent ORCID ICON IMG ; Lee, Yoon-Si ; Keierleber, Brian ; Hupp, Jack ; Samudrala, Anurag
  • Corporate Creators:
    Iowa State University. Bridge Engineering Center
  • Corporate Contributors:
    United States. Federal Highway Administration ; Iowa. Highway Research Board
  • Subject/TRT Terms:
  • Publication/ Report Number:
    IHRB Project TR-666;InTrans Project 13-481
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Iowa
  • Corporate Publisher:
    Iowa State University. Institute for Transportation
  • Abstract:
    In reinforced concrete systems, ensuring that a good bond between the concrete and the embedded reinforcing steel is critical to ; long-term structural performance. Without good bond between the two, the system simply cannot behave as intended. The bond ; strength of reinforcing bars is a complex interaction between localized deformations, chemical adhesion, and other factors. ; Coating of reinforcing bars, although sometimes debated, has been commonly found to be an effective way to delay the initiation ; of corrosion in reinforced concrete systems. ; For many years, the standard practice has been to coat reinforcing steel with an epoxy coating, which provides a barrier between ; the steel and the corrosive elements of water, air, and chloride ions. Recently, there has been an industry-led effort to use ; galvanizing to provide the protective barrier commonly provided by traditional epoxy coatings. However, as with any new ; structural product, questions exist regarding both the structural performance and corrosion resistance of the system. ; In the fall of 2013, Buchanan County, Iowa constructed a demonstration bridge in which the steel girders and all internal ; reinforcing steel were galvanized. The work completed in this project sought to understand the structural performance of ; galvanized reinforcing steel as compared to epoxy-coated steel and to initiate a long-term corrosion monitoring program. This ; work consisted of a series of controlled laboratory tests and the installation of a corrosion monitoring system that can be observed ; for years in the future. ; The results of this work indicate there is no appreciable difference between the bond strength of epoxy-coated reinforcing steel ; and galvanized reinforcing steel. Although some differences were observed, no notable difference in either peak load, slip, or ; failure mode could be identified. Additionally, a long-term monitoring system was installed in this Buchanan County bridge and, ; to date, no corrosion activity has been identified.
  • Format:
    PDF
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/28441/dot_28441_DS1.pdf
  • File Type:
    Filetype[PDF - 1.19 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:b22cd42adcd78db998a1ee599bf48ac4c6c7a947eb6bebde869050c07c1b46e02b2b37b013afba45a0177a64a72d078d2a224697b5f2461f04bc4600900ac4f5
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