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- Title
Korrosionsdetektion an Stahlbetonbauwerken: konventionell und innovativ.
- Authors
Keßler, Sylvia; Emmenegger, Leonidas P.; Sagüés, Alberto A.
- Abstract
Corrosion detection on reinforced concrete structures: conventional and innovative The designed service life of reinforced concrete structures is often shortened due to chloride‐induced reinforcement corrosion. The ingress of chlorides from sources such as de‐icing salts or marine environment can cause corrosion as soon as a critical chloride threshold reaches the first reinforcement layer. The consequence of corrosion are cracks and spalling of the concrete cover which impairs the serviceability and in an advanced stage the load bearing capacity of a structure. Thus, corrosion inspection is highly recommended for chloride‐exposed structures to clarify (i) if corrosion is initiated and (ii) to which extent. The determination of further inspection intervals and/or repair measures relies on reliable corrosion condition assessment. The conventional corrosion inspection method is the half‐cell potential measurement where a reference electrode is placed on the concrete surface and the potential is measured between the reference electrode and the reinforcement in the concrete. Recently an innovative corrosion inspection method has been developed at the University of South Florida, which is based on the principle of the Kelvin probe. The advantage of this method is that it does not require physical contact to the concrete. The resulting potentials of both methods show very good correlation. Hereinafter, the paper describes and discusses both corrosion inspection methods.
- Subjects
UNIVERSITY of South Florida; CONCRETE durability; REINFORCED concrete corrosion; STANDARD hydrogen electrode; STRESS corrosion cracking; MAINTAINABILITY (Engineering); SURFACE potential; CONCRETE testing
- Publication
Bautechnik, 2020, Vol 97, Issue 1, p11
- ISSN
0932-8351
- Publication type
Article
- DOI
10.1002/bate.201900069