Korrosionsmonitoring von Stahlbetonbauwerken als Element des Lebensdauermanagements - Einsatz innovativer Drahtsensorik zur Überwachung der Bewehrungskorrosion

Corrosion Monitoring as an Element of Service-Life-Management

Application of innovative filament sensors for rebar corrosion survey Since corrosion induced damages at civil structures result in enormous costs over lifetime, the assured assessment of the corrosion risk and an early identification and reliable prognosis of rebar corrosion are key tasks of the building management of corroding prestressed and steel reinforced concrete structures. Here an evaluation of the corrosion state is objectively possible by means of Structural Health Monitoring (SHM).
In this contribution after a brief introduction of monitoring based service-life-management, the development, testing and optimization of novel calibration-free miniature sensors for the detection of rebar corrosion in concrete members are introduced. By means of these versatile corrosion dummy sensors, made from several 0,065 mm up to 0,5 mm thin steel filaments and mounted within the concrete cover, the penetration of the depassivation front into concrete can be observed easily, reliably and cost effectively. Based upon various investigations in the lab scale and application testing during the time period of six years, the findings and further developments of the filament sensor will be presented and discussed.