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- Corrosion (2)
- Einflussgrößen (2)
- Betonstahl (1)
- Chloride (1)
- Chromate (1)
- Concrete (1)
- Concrete parameters (1)
- Fehlerquellen (1)
- Galvanized construction elements (1)
- Galvanized rebar (1)
- Hydrogen evolution (1)
- Hydrogen-induced stress corrosion cracking (1)
- Kathodische Polarisation (1)
- Korrosion (1)
- Messraster (1)
- Nachweisgrenzen (1)
- Pitting corrosion (1)
- Praktische Bedeutung (1)
- Prestressed concrete (1)
- Prestressing steel (1)
- Prüfprotokoll (1)
- Rebar (1)
- Reinforcement (1)
- Self-corrosion (1)
- Spannbeton (1)
- Spannstahl (1)
- Steel reinforcement (1)
- Verfahrensbeschreibung (1)
- Verzinkt (1)
- Verzinkte Einbauteile (1)
- Wasserstoffinduzierte Spannungsrisskorrosion (1)
- X-ray tomography (1)
Organisationseinheit der BAM
Investigations of corrosion on small cathodes in reinforced concrete - observations and suggestions
(2009)
Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious
problem in civil engineering practice. The standards and guidelines contain only minimum
requirements regarding concrete quality and concrete cover. In very critical cases, for example the
ingress of chlorides, the application of different coatings is currently the only possibility to protect the
reinforced concrete structures. In this case the modelling of reinforcement corrosion would be more
practical. One sub-project of a DFG-research project (FOR 537) is currently performed at the Federal
Institute for Materials Research and Testing (BAM). Aim of the sub-project is the description of
corrosion propagation and the characterization of the corrosion on specimens with small cathodes by
electrochemical parameters. The electrochemical parameters are determined by suitable
electrochemical measurements, considering concrete parameters as well as different environmental
conditions.
Corrosion behavior of galvanized reinforcement in chloride containing mortar and carbonated mortar
(2018)
Korrosionseigenschaften von feuerverzinktem Betonstahl unterscheiden sich grundlegend von herkömmlichen Betonstahl. In diesem Vortrag sind Beispiele für das Korrosionsverhalten in chloridhaltigen und carbonatisierten Mörteln dargestellt
Steel in concrete is protected by the alkaline pore water environment and the resulting formation of a protective passive layer against corrosion. Adverse environmental conditions due to carbonation or chloride ingress can destroy the passive layer on the steel surface. Corrosion processes starting in those areas lead to uniform corrosion or local corrosion like pitting corrosion. In comparison to uniform corrosion pitting corrosion is a form of increased local corrosion and thus leads to a progressive reduction in cross-section of the reinforcing steel. The corrosion products are first absorbed by the pores of the concrete matrix, without causing visible external changes at the concrete surface.