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Improved engineering model for the propagation stage of chloride-induced pitting corrosion of steel reinforcement



Title: Improved engineering model for the propagation stage of chloride-induced pitting corrosion of steel reinforcement
Author(s): J. Gulikers
Paper category : conference
Book title: Third International RILEM Workshop on Testing and Modelling Chloride Ingress into Concrete
Editor(s): C. Andrade and J. Kropp
Print-ISBN: 2-912143-48-9
e-ISBN: 2912143578
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 257 - 268
Total Pages: 12
Nb references: 9
Language: English


Abstract: An engineering approach for the determination of the propagation stage of reinforcement corrosion has been adopted. The model proposed focuses on the loss of steel cross sectional area resulting from localised corrosion due to macrocell action. Three practical shapes of the pit geometry are considered, i.e. two elliptic and one circular cross section are used to simulate realistic shapes of corrosion attack. The associated cross sectional volume loss and the exposed surface area of the steel bar are described by a polynomial. A numerical analysis based on a modified resistor network has been used to calculate the magnitude of the macrocell current for a simple coplanar arrangement. This information is used as an input to calculate the development of the local penetration depth, surface area under corrosion attack, steel volume consumed by corrosion, and local corrosion current density over time. The improved corrosion deterioration model can be used to formulate a probabilistic model which allows calculation of the probability that a given reduction of the reinforcement cross-section has taken place at a certain time.


Online publication: 2002-12-15
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143578.017