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

Details

• Creators:
  Phares, Brent ; 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:
  Bond Strength (Materials) Corrosion Epoxy Coatings Galvanizing Laboratory Tests Reinforced Concrete Bridges Reinforcing Bars Reinforcing Steel
• 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
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b22cd42adcd78db998a1ee599bf48ac4c6c7a947eb6bebde869050c07c1b46e02b2b37b013afba45a0177a64a72d078d2a224697b5f2461f04bc4600900ac4f5
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28441/dot_28441_DS1.pdf
• File Type:
  [PDF - 1.19 MB ]