Corrosion characteristics of unprotected post-tensioning strands under stress : [summary].

Details

• Creators:
  Sagüés, Alberto
• Corporate Creators:
  University of South Florida
• Subject/TRT Terms:
  • Corrosion protection
  • Posttensioning
  • Reinforced concrete
  • Piles (Supports)
  • Tensile strength
  • Bend tests
  • Reinforcing steel
  • Rusting
  • Tendons (Materials)
• Publication/ Report Number:
  BDK84-977-22
• Resource Type:
  Brief
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  Post tensioned concrete is used in many Florida ; transportation structures, many of which are ; exposed to fresh or salt water. The steel strands ; that supply the tension are encased in a plastic ; duct which is later filled with grout, so the strands ; are generally well protected from the elements. ; However, during construction, strands may ; reside in the pipe for a while before tensioning ; or grouting. During this time, the strands are ; vulnerable to corrosion. Florida Department of ; Transportation (FDOT) guidelines specify sealing ; the duct to exclude moisture or other harmful ; agents from reaching the steel strand. However, ; if moisture is sealed in the duct or the duct is ; inadequately sealed, corrosion can result. Ideally, ; ducts are grouted within hours of stressing, but ; there are circumstances that can delay grouting ; for days or, rarely, weeks. If damaged, strand ; failure can be immediate, or it can mature over ; time to produce delayed failure.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27344/dot_27344_DS1.pdf
• File Type:
  [PDF - 1.06 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2de3fe0e0c3b574c60b7c9017a796780d9b7c4edc1e107f8b8fcdb15dba1a125