Numerical modelling of reinforcement corrosion

Author(s): J. Warkus, M. Raupach
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 285 - 298
Total Pages: 14
Language: English

Reinforcement in alkaline concrete is usually protected against corrosion by the formation of a passive layer. The ingress of chlorides or carbonation (initiation stage) leads to the dissolution or local breakdown of the passive layer. As a consequence, corrosion can proceed (propagation stage).
The investigation of the propagation stage is the object of a joint research project, carried out by five German research institutes. The aim of one subproject is to investigate the corrosion process in case of macrocell formation with a local anode and huge cathodes. The investigations are carried out by measurements on specimens and numerical calculations. These simulations are used to estimate the effects of changes in boundary conditions or statistically scattered input parameters.
The geometry of the specimens varies from a simple reinforcement arrangement with two parallel bars to a more complex, two-dimensional or three-dimensional geometry. The depassivation of the anodically acting steel bars has been induced by the admixture of chlorides to the fresh concrete.
For all specimens the resulting macrocell currents and the corrosion potentials are measured and compared to the results of the numerical simulations. The results will be used to develop an engineering model for the propagation phase.
In this paper results of the measurements in comparison to the simulations are presented and discussed.

Keywords: corrosion, modelling, concrete, reinforcement, simulation

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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