Studying the Possibility of Using Galvanostatic Pulse Transient Technique in Concrete Beam Bars Corrossion

In this paper, corrosion rate of bars in concrete structures was examined using transientpotential response at corrosion intersection method by stimulating a small gavanostaticpulse. In this study, measurements on steel bars subjected to corrosion in concrete beamwere conducted under intensive corrosion conditions. Times of applying galvanic pulse arebetween 5 and 180 second and lateral distance of measuring point from the bar variesbetween 0 and 400 mm. To evaluate transient electrochemical responding results, 1 kHz sampling rate was used which allows corrosion equalization with a set of distinguishablecapacitors and resistors, despite other methods, their values are proportionate to the barcorrosion conditions. Here, first, corrosion rate is calculated through resistor elementsconnected with corrosion intersection and then it is compared to the corrosion ratedetermined using the widely used method Linear Polarization Resistance (LPR). The resultsdemonstrate that Galvanostatic pulse transient technique allows evaluation of LinearPolarization Resistance, and corrosion values gained are more reliable than LPR method.