3D Numerical modelling of steel corrosion in concrete structures

Coupled carbonation-rust formation-damage modeling and simulation of steel corrosion in 3D mesoscale reinforced concrete

“…Note that the explicit introduction of aggregates in the numerical models allows reproducing to a certain extent a part of the heterogeneous nature of the concrete, and differs from most of the other studies which consider a homogeneous concrete (see e.g. [42][43][44]). This is believed to be important in particular for estimating the initiation and propagation paths of the cracks, as the behavior of both mortar matrix and aggregates are dissimilar.…”

Theoretical study of similar experimental method for durability of concrete under artificial climate environment

“…According to theoretical analysis and numerical simulation of concrete structures durability by Topcu et al [36] , O 2 was the main reason for the durability of concrete structures. Many qualitative and quantitative studies analyzed the influence of O 2 on the durability of concrete, and the main factors that affected O 2 permeability were water-cement ratio, protective layer thickness, oxide content, processes, etc [37][38][39] .…”

Determination of critical anodic and cathodic areas in corrosion processes of steel reinforcement in concrete

“…The electric current through the electrolyte is a result of motion of charged particles and, if electrical neutrality of the system and uniform ions concentration are assumed, this can be written as: where is electric current density vector, σ is electrical conductivity of concrete and is electric potential. If electrical neutrality is accounted for and electrical conductivity of concrete is assumed to be uniformly distributed, the equation of electrical charge conservation reads : For a given boundary conditions, on all surfaces of the concrete body, the solution of the Laplace Equation determines the electric potential distribution, and using Equation the corrosion current density can be calculated.…”

“…The developed 3D chemo‐hygro‐thermo‐mechanical model, which is employed in the present numerical simulations, couples the above mentioned physical and electrochemical processes with mechanical behavior of concrete (damage). The model can simulate processes before and after depassivation of steel reinforcement in concrete . In order to predict the rate of rust production and related effects, it is necessary to simulate the following physical, electrochemical, and mechanical processes: (i) transport of capillary water, oxygen, and chloride through the concrete cover; (ii) immobilization of chloride in the concrete; (iii) drying and wetting of concrete as well as related hysteretic properties of concrete; (iv) transport of OH − ions through electrolyte in concrete pores; (v) cathodic and anodic polarization; (vi) transport of corrosion products in concrete and cracks; (vii) creep and shrinkage of concrete; and (viii) damage of concrete due to mechanical and non‐mechanical actions.…”