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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English
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  • Creators:
  • Corporate Creators:
    University of Florida. Dept. of Chemical Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    BDV-31-977-19
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Corporate Publisher:
    Florida. Dept. of Transportation
  • 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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