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- W577759772 abstract "A proof of concept was established for a sensor capable of using indirect impedance spectroscopy to detect the existence of corrosion in post-tensioned tendons. This development was supported by a combination of bench-top experiments performed on synthetic tendons, bench-top experiments performed in synthetic grout pore solutions for the same steel used in tendons, and modeling used to interpret impedance measurements and to simulate the signals obtained by the sensor. This work showed that indirect impedance can be used to observe differences in the impedance and differentiate between active and passive steel. Sensitivity to localized corrosion was found to be greatest when a current injection electrode is positioned directly above the corroding metal. Since the polarized area of steel was found to be a function of both frequency and the condition of the steel, it will be difficult to extract detailed reaction kinetics from the indirect impedance measurement, but the measurement will identify the presence of active corrosion. Bench-top measurements performed for ASTM A416 steel in aerated simulated pore electrolytes at pH of 13.6 showed a porous electrode behavior with a low rate of corrosion. In the absence of oxygen, the porous electrode behavior was also observed, but the corrosion rate increased. Experiments performed at elevated temperature showed an increase in the corrosion rate. This work provides guidance for the development of future models for interpretation of indirect impedance measurements." @default.
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- W577759772 date "2014-08-01" @default.
- W577759772 modified "2023-09-22" @default.
- W577759772 title "Impedance-Based Detection of Corrosion in Post-Tensioned Cables: Phase 2 Extension of Sensor Development" @default.
- W577759772 hasPublicationYear "2014" @default.
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