Naslov
Modeling Damage of Concrete Caused by Corrosion of Steel Reinforcement

Autori
Ožbolt, Joško ; Oršanić, Filip ; Kušter, Marija ; Balabanić, Gojko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013 / Van Mier, J.G.M. ; Ruiz, G. ; Andrade, C ; Yu, R.C. ; Zhang, X.X. - Barcelona : International Center for Numerical Methods in Engineering (CIMNE), 2013, 1-12

ISBN
9788494100413

Skup
8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013

Mjesto i datum
Toledo, Španjolska, 11.03.2013. - 14.03.2013

Vrsta sudjelovanja
Plenarno

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Reinforced concrete; Corrosion; Damage; Chemo-hygro-thermo-mechanical model; Finite elements; Microplane model

Sažetak
Reinforced concrete structures exposed to aggressive environmental conditions, such as structures close to the sea or highway bridges and garages exposed to de-icing salts, often exhibit damage due to corrosion. Damage is usually manifested in the form of cracking and spalling of concrete cover caused by expansion of corrosion products around reinforcement. The reparation of corroded structure is related with relatively high direct and indirect costs. Therefore, it is important to have a realible model, which is able to realistically predict influence of corrosion on the safety and durability of RC structures. In the present contribution a 3D chemo-hygro-thermo- mechanical model for concrete is presented. In the model the interaction between non-mechanical influences (distribution of temperature, humidity, oxygen, chloride and rust) and mechanical properties of concrete (damage), is accounted for. The mechanical part of the model is based on the microplane model. The application of the model is illustrated on two numerical examples in which transient 3D finite element analysis of RC specimens exposed to corrosion of steel reinforcement is carried out. In the first example the model is employed to investigate the pull-out capacity of corroded steel reinforcement from a concrete beam-end specimen, which was exposed to aggressive environmental conditions. Once the reinforcement is depassivated (begin of corrosion), corrosion rate is calculated and 1D corrosion contact elements are automatically activated generating radial compressive forces, which damage concrete cover. Finally, to predict the effect of corrosion on the pull-out capacity of reinforcement, the reinforcement bar is pulled out from the concrete specimen. The contact between reinforcement surface and concrete is simulated by the 1D discrete bond elements. The results of the computation are compared wit experimental data. In the second example the numerically predicted crack patterns due to corrosion of reinforcement in a beam are compared with experimental results. The influence of the anode-cathode position on the corrosion induced damage is investigated. The comparison between numerical results and experimental evidence shows that the model is able to realistically predict experimentally observed crack pattern and that the position of anode and cathode strongly influences the crack pattern and corrosion rate.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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