Studies on the Effect of a Limited Polarization Range of Reinforcement on Impedance Spectra Shapes of Steel in Concrete

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 in reinforcement polarization area. The observed phenomenon was explained on the basis of the original 3D model of steel–concrete system.