This paper is focused on the problem of the chloride-induced corrosion of the rebar in reinforced concrete, particularly in the case of slabs and decks of bridges. A comprehensive model for the chloride ingress into concrete is presented, with special…
This paper is focused on the problem of the chloride-induced corrosion of the rebar in reinforced concrete, particularly in the case of slabs and decks of bridges. A comprehensive model for the chloride ingress into concrete is presented, with special attention to non-linear diffusion coefficients, chloride binding isotherms and convection phenomena. The model tries to use a priori parameter estimations, according to material characteristics and external environment conditions, instead of a posteriori best fit. Complex geometries, like random cracks, can also be incorporated. Based on the results of chloride diffusion, subsequent active corrosion is assumed and the radial expansion of the corroded reinforcement reproduced. For cracking simulation, the Strong Discontinuity Approach is applied. Both models, corresponding to initiation and propagation corrosion stages, are incorporated in the same finite element program and chained. Comparisons with experimental results are carried out, with reasonably good agreements being obtained, especially for cracking patterns. Major limitations refer to difficulties to establish precise levels of basic data such as the chloride ion content at concrete surface, the chloride threshold concentration that triggers active corrosion, the rate of oxide production or the rust mechanical properties.