Corrosion protection of prestressing strand in transportation structures and strand-concrete bond improvement.

Details

• Creators:
  Anderson, Marc ; Oliva, Michael ; Tejedor, Isabel
• Corporate Creators:
  National Center for Freight and Infrastructure Research and Education (U.S.)
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Corrosion protection
  • Prestressed concrete bridges
  • Anticorrosion coatings
  • Pitting
  • Tension tests
  • Pull out test
  • Bond strength (Materials)
• Publication/ Report Number:
  CFIRE 05-12
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  National Center for Freight and Infrastructure Research and Education (U.S.)
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance
• Abstract:
  Corrosion can lead to the premature deterioration and failure of transportation structures. In pre-stressed bridge structures corrosion is more severe, ; leading to sudden failures when cracking is induced at pitting sites by tensile or compressive stresses. This work studies the viability and effectiveness ; of inorganic nanoporous coatings as corrosion protection for carbon steel prestressing strand. Inorganic nanoporous metallic coatings can offer the ; benefit of not reducing, but possibly enhancing the steel-concrete bond and adding some corrosion resistance to the strand. Anodic Polarization ; measurements of critical pitting corrosion potential were performed on Grade 270 low-relaxation steel wires from three strand manufacturers in bare ; and coated conditions. In addition, the wires were subjected to tensile stresses as they would be on a prestressing application and subsequently tested ; for pitting corrosion potential. Two metallic oxide coatings were used in this work namely acidic zirconia (ZrO2) and acidic titania (TiO2). The steelconcrete ; bond characteristics were measured by pull-out tests based on the current NASP Bond Test Research. Finally, tension tests measure the ; elastic modulus and strength of the steel before and after the heat treatment involved the coating process. Findings show an increase in corrosion ; resistance of coated wires prior to being stressed in tension. After tensioning the wires to 80% of their ultimate capacity, the corrosion resistance ; generally decreases. Pull-out tests show a 100-150% increase of bond strength for coated wires. No effects on the mechanical properties of the steel ; can be appreciated for heated treated samples with respect to those that have not been heated.
  More +
• Format:
  PDF
• Funding:
  DTRT06-G-0020
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26211/dot_26211_DS1.pdf
• File Type:
  [PDF - 15.08 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0803d427ba60b42a9a8a98f6a1874fe291c92cdf81afa64167d9e06e63232547ef3cb8adfdd8e4e59599b33e7e896ed5b14977d5f18c3bb8d8f0ef53a96584b0