Instandsetzungen von Parkhauszwischendecken nach dem Prinzip des kathodischen Korrosionsschutzes: Untersuchungen zum Schutznachweis bei Trennrissen.

Repair of car park ceilings with cathodic corrosion protection: investigations on the cathodic protection with separation cracks A repair of parking structures according to the repair principle of the cathodic corrosion protection (CP) can be an economic and gentle possibility to sustainably increase the remaining service life of the structure. RC ceilings frequently show separation cracks with penetrating chloride‐containing water and pitting corrosion of the reinforcement on the underside of the ceiling. This raises the question for the expert planner whether a CP system applied to the upper side of the ceiling can safely protect the corroding reinforcement on the underside. In practice it has been shown that proof of sufficient protection for this application is not trivial. This question was thoroughly examined in laboratory tests at the Institute for Material and Building Research of Munich University of Applied Sciences and in an underground parking garage. In summary of the investigations, it can be shown that the proof of the protection of the rear reinforcement in the separation crack can only be provided in a few of the investigated cases with the CP‐system installed solely on the upper ceiling side. The 100 mV criterion stipulated normatively in DIN EN ISO 12696 is too conservative for the proof of protection. However, if the proof of the 100 mV criterion is not successful, then corrosion and protective current measurements on subsequently electrically separated reinforcement areas can be considered more suitable for the proof of protection. [ABSTRACT FROM AUTHOR]