Evaluation of Corrosion Inhibiting Materials Applied by Impregnation (Pressure Injection) Methods to Prevent Corrosion of Post-Tensioned Tendons
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2020-08-01
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Edition:Final Report 12/15/16 – 9/30/20
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Abstract:Tendon impregnation has been proposed as a potential method to prevent and arrest corrosion in post-tensioned tendons. This technology uses the interstitial spaces between the tendon wires to inject a corrosion-mitigating fluid into the tendon. This project was performed to evaluate the long-term effectiveness and the service life of the material(s) used for impregnation of tendons and identify other materials that could produce better end results. In addition, the effects of the impregnation methods on the physical characteristics of the tendon system were evaluated to determine applicability to bonded tendons. Alternative fluids and Vector Corrosion Technologies’ proprietary fluid were tested. It was found that the alternative fluid provided temporary corrosion mitigation (several months) prior to requiring reimpregnation. The proprietary fluid was effective in arresting corrosion for at least twice as long, provided adequate application, as indicated by fluid removed at the end of the targeted application. Tendon failure forecasts showed that the proprietary fluid has the potential to extend tendon service life if fluid application is adequate and assuming reimpregnation is not required beyond the testing period of this work. The corrosion-mitigating capabilities may however be compromised by chloride-containing water intrusion. Additionally, pullout testing showed that the proprietary fluid causes a substantial reduction in the steel-to-grout bond strength, suggesting that the proprietary fluid would not be suitable for bonded tendon application in which load transfer is expected.
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