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A critical review of mathematical modelling of chloride ingress into concrete and the derivation of input data



Author(s): J. Gulikers
Paper category: Workshop
Book title: International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability
Editor(s): V. Baroghel-Bouny, C. Andrade, R. Torrent, K. Scrivener
ISBN: 978-2-912143-95-2
Pages: 165 - 175
Total Pages: 11
Language: English


Abstract: 
Most commonly, the so-called error function solution is employed to model chloride ingress into concrete over time. However, the modifications introduced in the mathematical expression to include a time-dependent chloride diffusion coefficient have resulted in significant differences between the outcome of numerical analyses and the outcome of using the modified mathematical expression. This is due to the fact that the modified expression does not fulfil the underlying differential equation anymore. With respect to service life predictions this is highly unfavourable situation which requires a re-definition of the chloride diffusion coefficient to prevent erroneous conclusions.
In addition, the derivation of appropriate input data is questionable as data obtained from measured chloride profiles is combined with results of short-term chloride penetration tests. A case study will be presented to exemplify the significant differences in service life prediction of reinforced concrete structures when using questionable input for the so-called age factor.


Online publication: 2007
Publication Type: full_text
Public price (Euros): 0.00