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The impedance test results of the steel reinforcement of various diameters, which was passivated and corroded in concrete specimens, were analysed. The impedance plots clearly indicated the tendencies for spectra shapes of steel rebars to change depending on their diameters. A 3-dimensional model of steel-concrete system was developed to explain the observed effect. This system was composed of the...
Polarization tests by impedance spectroscopy were conducted on single rebars in rectangular concrete specimens. Five different polarized areas of reinforcement were determined by means of an insulation tape on steel bars. The tests were conducted on two series of concrete specimens, with and without chlorides. The tests indicated a very clear effect of spectra “scaling” in a function of the change...
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