Abstract
The chloride ingress is one of the most significant problems to reinforced concrete structures in coastal areas and cold regions where the de-icing salt is commonly used. In this paper, the lattice type model which has been widely used in fracture analysis of brittle materials is applied to simulate the chloride diffusion process in cementitious materials. The theoretical background of the lattice type model in solving the mass transport problem is briefly presented. The analytical solution of the Fick’s law is adopted to theoretically validate the developed lattice type model. After that, two typical case studies are included to demonstrate the application of the lattice type model in the chloride ingress issue. In the first case, the tortuosity effect of the aggregates on the chloride diffusion front at meso-scale is studied by the lattice model. In the second case, the lattice model is applied in the simulation of the chloride diffusion in cracked concrete. The results show that the lattice type model can be a useful tool to simulate the chloride ingress in the cementitious materials.
Highlights
The chloride ingress is one of the most significant problems to reinforced concrete (RC) structures in coastal areas and cold regions where the de-icing salt is commonly used
When the chloride content at the surface of rebars reaches a threshold value, the passivation layer which protect the rebar from corrosion becomes unstable and the rebar starts to corrode with other prerequisites such as water and oxygen
The lattice type model is applied in the analysis of the chloride diffusion problem
Summary
The chloride ingress is one of the most significant problems to reinforced concrete (RC) structures in coastal areas and cold regions where the de-icing salt is commonly used. To estimate the approximate initiation time of rebar corrosion induced by the chloride ingress, the analytical models are usually adopted in engineering practice due to the convenience to use [2, 3]. The prototype of these analytical models is based on the analytical solution of the Fick’s law, C(x, t). Two case studies, i.e., chloride diffusion at meso-scale and cracked concrete, are presented to demonstrate the feasibility of the lattice type model in chloride diffusion problems
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