United States Department of Transportation
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FDOT Protocol for Condition Assessment of Steel Strands in Post-tensioned Segmental Concrete Bridges : Volume II
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2012-06-01
[PDF-298.62 KB]
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Alternative Title:Improved Inspection Techniques for Steel Prestressing/Post-tensioning Strand : Volume II;Improved Inspection Techniques for Steel Prestressing/Post Tensioning Strand : Volume II;
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Edition:Draft final; Mar. 2011-Jun. 2012.
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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.
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