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- W589045498 abstract "This report examines the applicability of ultralow frequency ac impedance spectroscopy (ULFACIS) for characterizing corrosion of rebar in concrete. The study focuses on demonstrating that ULFACIS could be used to locate and characterize corrosion nondestructively in reinforced concrete structures. A key issue was to establish whether ULFACIS could be used to determine the polarization resistance, and hence the corrosion rate, of the steel rebar. Impedance data were obtained for concrete test slabs containing three equally spaced rebars. The slabs contained ports exposing the rebar at regular distances so that high local corrosion rates could be induced by the addition of hydrochloric acid to simulate variations in corrosion rates along the rebar. The impedance function was successfully demonstrated to be sensitive to the presence and the extent of rebar corrosion. Tests performed for one, two, and three corrosion sites showed that ULFACIS can be used to spatially resolve areas of corrosion activity on the rebar. The researchers developed an electrical transmission line model to describe the experimental data. The fitting of this model showed that changes in the impedance function can be understood in terms of changes in the parameters of the transmission line. A procedure (ZSCAN) was developed for extracting the polarization resistance from the measured impedance data, so that the corrosion rate can be measured. ZSCAN was tested on theoretically generated and experimental data. The analytical techniques for measuring the polarization resistance provide a basis for the development of a practical corrosion rate 'meter' for use in the field." @default.
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- W589045498 date "1991-09-01" @default.
- W589045498 modified "2023-09-27" @default.
- W589045498 title "Evaluation of electrochemical impedance techniques for detecting corrosion on rebar in reinforced concrete, volume I: summary report" @default.
- W589045498 hasPublicationYear "1991" @default.
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