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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.
After the overwhelming breakthrough of medical computed axial tomography (CAT) in the 1970s, people at several places all over the world began to look for possible applications of this new picture-producing nondestructive testing method in the industrial field.
At Bundesanstalt für Materialprüfung (BAM), Berlin, Federal Republic of Germany, the first experiments" with an EMI 5005-scanner were performed in 1978. In the wide field of nondestructiveevaluation (NDE), there were found several prominent examples that could be scanned successfully with thesoft (Ex< 120 keV) x-rays of a medical machine. Among These were impregnated wood, plastics, ceramics, light compound materials (noniron), and archaeological objects.