J. Phys. IV France
Volume 136, November 2006
Page(s) 131 - 140
Publié en ligne 22 décembre 2006
Corrosion and Long Term Performance of Concrete in NPP and Waste Facilities
V. L'Hostis, F. Foct and D. Féron
J. Phys. IV France 136 (2006) 131-140

DOI: 10.1051/jp4:2006136014

Modelling the influence of ionic and fluid transport on rebars corrosion in unsaturated cement systems

W. Dridi1, P. Dangla1, F. Foct2 and I. Petre-Lazar2

1  LMSGC-Institut Navier, 2 allée Kepler, 77420 Champs-sur-Marne, France
2  EDF R&D MMC, Site des Renardières, 77250 Moret-sur-Loing, France

(Published online 22 December 2006)

This paper deals with numerical modelling of rebar corrosion kinetics in unsaturated concrete structures. The corrosion kinetics is investigated in terms of mechanistic coupling between reaction rates at the steel surface and the ionic transport processes in the concrete pore system. The ionic and mass transport model consists of time-dependent equations for the concentration of dissolved species, the liquid pressure and the electrical potential. The complete set of nonlinear equations is solved using the finite-volume method. The nonlinear boundary conditions dealing with corrosion are introduced at the steel-concrete interface where they are implicitly coupled with the mass transport model in the concrete structure. Both the case of free corrosion and potentiostatic polarisation are discussed in a one dimensional model.

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