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Long-term experiences with cathodic corrosion protection of steel reinforced concrete structures
(2002)
Case studies
(2013)
In this paper, some quite different survey tasks are described, and it can be seen that corrosion surveys will follow a certain scheme of data acquisition (first NDT measurements, than detailed testing on suspect areas), but the individual scope of on-site measurements may have a vast variety according to the local circumstances, and the interpretation always has to refer to a wider set of information than the data readings only.
Investigation of chloride-induced pitting corrosion of steel in concrete with innovative methods
(2016)
The combination of electrochemical and 3D computed tomography (CT) investigations offers the possibility of verifying electrochemical measurements non-destructively. Determining the steel surfaces damaged by pitting corrosion allows developing specimens having damage pattern corresponding to practice. Corrosion phenomena like decoupled pitting corrosion cannot be verified by electrochemical measurements only, but with the combination of those two kinds of investigations it is possible. Another advantage is the minimization of the number of samples. The classical experimental procedure requires the destruction of samples after each damage step.This can be avoided by the use of 3D computed tomography. As long as the corrosion phenomena are completely within the examination zone shown by the 3D computed tomography, the electrochemical measurements can be calculated on an area basis to get the specific corrosion rate or polarization resistance.
In indoor swimming pools stainless steels are used not only due to structural and economic reasons but also due to aesthetic considerations. And therefore not only safety relevant load bearing components have to fulfil their tasks but also the visual appearance should be free of any staining. In a lot of cases basic requirements (e.g. design criteria, material selection and maintenance) being essential parts of technical regulations were not taken into account. Typical case studies with explanation of the cause of the corrosion problems and possibilities to prevent them are shown in the present paper.