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Effect of temperature and concrete resistivity on the corrosion rate of steel in unsaturated concrete



Title: Effect of temperature and concrete resistivity on the corrosion rate of steel in unsaturated concrete
Author(s): Alexandre Maltais, Pierre Henocq
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 5
Language: English


Abstract: Monitoring the corrosion rate of steel reinforcement embedded in unsaturated concrete from electrical concrete resistivity measurements is a widely accepted practice. Although this empirical correlation method apparently provides consistent results, it is postulated that its precision could be improved by including the effect of other parameters. Consequently, an electrochemical model taking both the electrical concrete resistivity and the temperature into account was developed and validated in the present study.
The predicted corrosion rates and corrosion potentials are strongly influenced by the two factors considered and agree well with the experimental data reported in the literature. It is shown that the temperature dependence of the concrete resistivity and the exchange current densities should be considered for an accurate determination of the corrosion current density. The corrosion potentials predicted by the approach suggest that macrocell current may arise if significant temperature or concrete resistivity gradients develop along the reinforcement/concrete interface.


Online publication: 2006-08-02
Classification: 3.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.034