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Impedance-based detection of corrosion in post-tensioned cables : phase 2 extension of sensor development : [summary].
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2015-08-01
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By Orazem, Mark
[PDF-647.29 KB]
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Abstract:In post-tensioning construction, steel cables
running through PVC pipes buried in concrete
construction components are subjected to a high
level of tension and then secured. This gives the
component significant strength, allowing bridge
spans to be longer, reducing the number of
vertical supports, and saving construction dollars.
Post-tensioning has been used in many significant
bridges in Florida, including the Sunshine Skyway
Bridge. In several of these bridges, inspections
have revealed corrosion of post-tensioning cables,
which could compromise the structure, but
because of the placement of the cables, corrosion
can be difficult to detect. Studies of this problem
concluded that a nondestructive technique to test
for corrosion and corrosion risk in post-tensioned
bridge components was needed.
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