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97280 CYCLIC POLARIZATION RESISTANCE MEASUREMENTS OF CONCRETE REINFORCING STEEL WITH CONSTANT PHASE ANGLE ELEMENT CHARGE STORAGE BEHAVIOR

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Product Number: 51300-97280-SG
ISBN: 97280 1997 CP
Author: A. A. Sagues, S. C. Kranc, E. I. Moreno
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Many corroding interfaces exhibit electrochemical impedance response similar to that of a polarization resistance associated with the corrosion process, in parallel with a Constant Phase Angle Element (CPE) having relatively large admittance. Such conditions are often encountered in the case of steel in concrete. While polarization measurements using a forward and reverse potential scan rate dV/dt can be helpful to subtract the contribution of an ideal interracial capacitance C by using a C dV/dt correction, in concrete the pronounced frequency dispersion of the CPE complicates the time domain response and correction is not straightforward. A solution to the problem is presented in this paper and applied to evaluate the CPE parameters and estimate the polarization resistance of steel in concrete from cyclic-scan polarization measurements. The technique is demonstrated for experiments with plain steel and galvanized rebar in concrete. Keywords: concrete, corrosion, constant phase angle element, cyclic polarization, modeling, reinforcing steel.
Many corroding interfaces exhibit electrochemical impedance response similar to that of a polarization resistance associated with the corrosion process, in parallel with a Constant Phase Angle Element (CPE) having relatively large admittance. Such conditions are often encountered in the case of steel in concrete. While polarization measurements using a forward and reverse potential scan rate dV/dt can be helpful to subtract the contribution of an ideal interracial capacitance C by using a C dV/dt correction, in concrete the pronounced frequency dispersion of the CPE complicates the time domain response and correction is not straightforward. A solution to the problem is presented in this paper and applied to evaluate the CPE parameters and estimate the polarization resistance of steel in concrete from cyclic-scan polarization measurements. The technique is demonstrated for experiments with plain steel and galvanized rebar in concrete. Keywords: concrete, corrosion, constant phase angle element, cyclic polarization, modeling, reinforcing steel.
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