Impedance-based detection of corrosion in post-tensioned cables : phase 2 extension of sensor development.
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Impedance-based detection of corrosion in post-tensioned cables : phase 2 extension of sensor development.

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    • 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.

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