ABSTRACT
Evaluating the degradation process of concrete under corrosion-induced concrete fracture is significant in prolonging the service life of structures. This paper presents an electrochemical-chemical-mechanical phase field model to study the processes of non-uniform corrosion, reactive transport and precipitation of Fe(OH)2, rust-induced cracking. The non-uniform corrosion is described based on the electrochemical theory and the precipitation reactions of Fe2+ and OH- in the concrete pore are considered. The eigenstrain caused by rust is related to the volume fraction of corrosion products. The phase field regularized cohesive zone model is calibrated for concrete cracking. The phenomenon of rust movement through cracks can be observed by relating the diffusion coefficient of rust and the phase field variable. The proposed model is validated with the experimental data and shows good agreement with the experimental data.
