Corrosion of steel in reinforced concrete structures is one of the main causes of structural deterioration, which leads to increased deformation, cracking and premature failure. In the present work, macro-mechanical modelling of corrosion is performed. A mixed-mode damage model is adopted [2], in which localised cracking is modelled by a discrete crack approach. Several factors are taken into account, namely: the degradation of the bond- slip relationship, the reduction of the sane cross section of the reinforcement bars, the rate of corrosion due to the environment, the compressive strength and the stress state in the neighbourhood of the concrete-steel interface, which can lead to an increase of the bond strength under compression, or to a decrease of the bond strength under tension. Special attention is given to the the passive evolution of corrosion, which affects the structure in time. In this case, degradation occurs under stabilised loading, with corresponding stiffness decrease. The increase of corrosion leads to an increase of damage at the bond-slip level. A Total Iterative Approach (TIA) is adopted in the present work [1], in which the structure is reevaluated each time step, upon damage increase due to corrosion. Pullout tests are first presented to evaluate the performance of the material model and bending tests are also performed to evaluate the influence of corrosion at structural level.