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8. Modelling of reinforcement corrosion: macro cells and time dependence



Title: 8. Modelling of reinforcement corrosion: macro cells and time dependence
Author(s): J. Harnisch, J. Warkus, M. Raupach
Paper category : conference
Book title: NUCPERF 2009 - Long Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants and Waste Management
Editor(s): V. L'Hostis, R. Gens, C. Gallé
Print-ISBN: 978-2-35158-072-1
e-ISBN: 978-2-35158-087-5
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 71 - 78
Total Pages: 8
Nb references: 5
Language: English


Abstract: As part of the joint research group DFG - FOR 537 "Modelling of reinforcement corrosion" /1/ this subproject investigates macro cell formation with a main emphasis on geometrical influences. Another important aspect that will be investigated within the next years is the time dependence of the anodic activity and the macro cell current. Hence, this subproject provides key data for the final design model. The investigations on macro cells were carried out by laboratory experiments and additionally by numerical analyses to increase the available database especially with respect to geometrical influences. Chloride induced corrosion of real structures, however, is influenced by many time-dependent factors, g.e. the temperature and the polarisation behaviour of depassivated reinforcement. In order to implement the time dependence in the probabilistic design model, extensive laboratory tests on about 120 macro cell corrosion specimens are being carried out. During a time span of two years, electrochemical measurements and visual inspections are conducted on the test specimens to investigate especially the time-dependent behaviour of the anodically acting parts. The determination of the characteristic corrosion patterns and metal removal of the anodic areas are achieved with a unique 3-D optical technique using high-resolution digital cameras.


Online publication: 2009-11-16
Publication type : full_text
Public price (Euros): 0.00


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