engleski

Modeling influence of hysteretic moisture behavior on distribution of chlorides in concrete

Aggressive environmental conditions, such as exposure to the sea climate or use of de-icing salts, have considerable influence on durability of reinforced concrete structures due to the reinforcement corrosion induced damage. Recently the coupled 3D chemo-hygro-thermo-mechanical (CHTM) model for modelling of processes related to the chloride induced corrosion of steel reinforcement in concrete was developed. In the model is assumed that for wetting and drying of concrete, the transport of water is controlled by a single sorption curve. However, it is well known that concrete exhibit hysteretic moisture behaviour, which significantly influences distribution of moisture and chlorides. To account for the hysteretic moisture behaviour of concrete and for more realistic time and space distribution of moisture, the CHTM model was further improved. The proposed hysteretic model is implemented into a 3D finite element code and it is validated on numerical example, which shows reasonably good agreement with the available test results. Similar as observed in the experimental tests, it is shown that due to the wetting and drying of concrete surface the peak concentration of chloride moves deeper into the concrete specimen.

reinforced concrete ; corrosion ; chemo-hygro-thermo-mechanical model ; hysteretic moisture behaviour ; microplane model ; finite elements

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