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原文传递 EVALUATION OF ELECTROCHEMICAL IMPEDANCE TECHNIQUES FOR DETECTING CORROSION ON REBAR IN REINFORCED CONCRETE.

题名：	EVALUATION OF ELECTROCHEMICAL IMPEDANCE TECHNIQUES FOR DETECTING CORROSION ON REBAR IN REINFORCED CONCRETE.
作者：	Macdonald-DD; El-Tantawy-YA; Rocha-Filho-RC; Urquidi-Macdonald-M
关键词：	STRATEGIC-HIGHWAY-RESEARCH-PROGRAM; EVALUATION-; ELECTROCHEMISTRY-; IMPEDANCE-; CORROSION-TESTS; REBARS-; REINFORCED-CONCRETE; RESEARCH-
摘要：	The 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. The study also established whether ULFACIS could be used to determine the polarization resistance, and hence the corrosion rate of the steel rebar. The impedance function was successfully demonstrated to be sensitive to the presence and extent of rebar corrosion. Tests performed showed that ULFACIS can be used to spatially resolve areas of corrosion activity on the rebar. An electrical transmission line model to describe the experimental data was developed. A procedure was developed for extracting the polarization resistance from the measured impedance data, so that the corrosion rate can be measured. 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.
总页数：	1991/09. pp82 (Figs., Tabs., Refs.)
报告类型：	科技报告