Improved Inspection Techniques for Steel Prestressing/Post-tensioning Strand : Volume I

Details

• Alternative Title:
  Improved Inspection Techniques for Steel Prestressing/Post Tensioning Strand : Volume I
• Creators:
  Azizinamini, Atorod ; Gull, Jawad
• Corporate Creators:
  Florida International University
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  • Bridges
  • Tensioning
  • Pretensioning
  • Posttensioning
  • Nondestructive tests
  • Inspection
  • Nondestructive evaluation
  • Prestressing
  • Post-tensioning
  • Inspection
  More +
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Edition:
  Draft final; Mar. 2011-Jun. 2012.
• Corporate Publisher:
  Florida International University
• Abstract:
  Post-tensioned bridges require a detailed inspection of their post-tensioning systems since damage in these ; systems is not evident and can result in costly repairs/replacements, loss of integrity and reduction in safety ; of the bridge. Different nondestructive evaluation (NDE) techniques can be used for the inspection of post- ; tensioning systems however; there is no systematic way by which a particular NDE technology may be ; selected for a particular job. ; This project presents elements and foundation for development of a systematic, job specific approach for the ; selection of NDE technology for inspection of the post-tensioning systems. ; In order to achieve this goal, factors affecting the performance of NDE techniques used for the condition ; assessment of the post-tensioning systems are identified. NDE techniques are then grouped according to ; their underlying phenomenological bases to put forth the working principles, and pros and cons that can be ; used for the development of ranking system. ; It has been found that major difference in grouting practice before and after 2000 affects the selection of ; NDE technique for the inspection of post-tensioning systems. Other factors affecting the performance of the ; NDE techniques are the duct system, geometrically difficult zones, and the types of defects. Separate sets of ; NDE technique are recommended for the internal/external ducts positioned along the traffic and ; geometrically difficult zones. A job specific “Ranking Index” is proposed for the selection of NDE that ; takes into account the not only the above mentioned factors but also the cost of conducting NDE. Based on ; the project findings a roadmap to develop comprehensive methodology to effectively assess the condition of ; post-tensioned bridge systems is presented.
  More +
• Format:
  PDF
• Funding:
  BDK80 977-13
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25056/dot_25056_DS1.pdf
• File Type:
  [PDF - 4.00 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:27bd8aa4db707e2d1a1aa7c560099f41d3a626d71cd92632ad097079dfe83711