engleski

Effect of damage on chloride penetration profi les in concrete structures

In the present paper a current status of development of a 3D numerical chemo-hygro-thermo-mechanical model for concrete is presented. In the model the interaction between the non-mechanical (distribution of temperature, humidity, oxygen and chloride) and mechanical properties of concrete (damage) is accounted for. The formulation of the model and its implementation into a 3D fi nite element code are briefl y discussed. The formulation is restricted to the processes up to the depassivation of reinforcement. The application of the model is illustrated on one numerical example in which the transient 3D FE analysis of RC slab is carried out in order to demonstrate the infl uence of damage of concrete on depassivation time of reinforcement. In the analysis the load free and previously loaded RC slabs are exposed to the aggressive infl uence of sea water. Due to external load, the loaded beam was damaged before the exposure. Consequently, its depassivation time is much shorter than the depassivation time of companion slab, which was load free. The reason is due to the cracking of concrete, which signifi cantly accelerates processes that are relevant for depassivation of reinforcement. The numerical results are in good agreement with experimental observations.

Concrete; Damage; Corrosion; Chemo-hygro-thermo-mechanical model;

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