T. Juraschek
EUROCORR 2017, Prag, 3. September 2017

Chemical, Non-Electronic Corrosion Indication Systems

ABSTRACT: Corrosion of the steel reinforcement in concrete causes an enormous economic damage. In particular, chloride-induced macroelement corrosion of the reinforcement is one of the bottlenecks in the service life time design of a majority of infrastructure buildings with a significant exposition to chloride. Corrosion monitoring offers a possibility to detect the onset of corrosion events and start independent restoration actions at a point, where costs can be kept at a minimum.
The presentation focusses on the testing procedure and verification of the prototype, under conditions simulating real-life corrosion events. Color change is not observed when applying zero-load currents, but occurs within minutes after raising either the potential or current to levels typical for corrosion events. The color change is persistent even after turning the power source off. We applied potential controlled current profiles as well as voltage controlled current profiles to the device, also with respect to peak current profiles to show the response of the system under realistic circumstances. Also, we investigate the influence of zero-load current and voltage events during the passive state of the reinforcement steel after passivation. Furthermore, experiments on reinforcement steel and reinforced concrete samples are shown as a proof-of-principle experiment.