A comparison of methods to assess the resistance of reinforcing steel against chloride‐induced corrosion in concrete—Particular consideration of 12% chromium steel

The critical chloride content Ccrit is an indicator of the corrosion resistance of reinforcing steels in concrete. In this article, several experimental methods for determining the critical chloride content Ccrit of mild and alloyed (12% Cr) steel in cementitious materials are compared. The methods...

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Bibliographic Details
Published in:Materials and corrosion 2022-03, Vol.73 (3), p.306-325
Main Authors: Boschmann Käthler, Carolina, Ebell, Gino, Keßler, Sylvia, Schiegg, Yves, Dauberschmidt, Christoph, Angst, Ueli M.
Format: Article
Language:English
Subjects:
Accelerated tests
Alloying
Chloride
Chromium steel
Chromium steels
Corrosion resistance
Corrosion resistant steels
Laboratory tests
Reinforcing steels
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Summary:The critical chloride content Ccrit is an indicator of the corrosion resistance of reinforcing steels in concrete. In this article, several experimental methods for determining the critical chloride content Ccrit of mild and alloyed (12% Cr) steel in cementitious materials are compared. The methods used include accelerated polarization tests and tests employing more natural (unpolarized) conditions in which chloride ingress occurs by diffusion and capillary uptake. The advantages and disadvantages of the methods are discussed, in particular, against the objective of reaching a compromise between applicability to practice and feasibility in laboratory testing. Several methods to measure the critical chloride content Ccrit of steel in concrete are compared on the basis of 12% chromium steel and carbon steel. The resulting Ccrit depends on the method used. The reasons for this and the corresponding influencing parameters are discussed in this article.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.202112826