United States Department of Transportation
i
State-of-the-Practice Report: Monitorable Post-Tensioning Systems
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2021-10-01
[PDF-4.27 MB]
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Abstract:The technology of electrically isolated tendons (EIT) is a concept to protect and monitor tendons against corrosion attack from the outside of the tendon, which is a common cause for premature degradation in corrosive environments. The technology is based on a full encapsulation of the tendon in a plastic duct, shielding the tendon from chlorides, moisture, and oxygen, thereby limiting the extent to which corrosion reactions at the pre-stressing wires/strands can occur. Furthermore, the technology includes complete electrical isolation of the tendon from the reinforcing steel. This permits monitoring of the tendon over time using nondestructive inspection and condition assessment during the service life via electrical resistance and other measurements. Additionally, the EIT technology reduces the risk of stray current induced corrosion. This Report reviews existing information concerning EIT and describes the principles of EIT technology, the components, performance testing, and monitoring procedures.
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