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Models for the description of thermomechanical material properties of early-age concrete

le 11 mars 2016
14H00

Wibke Hermerschmidt, research assistant at TU Braunschweig, institute for building materials, concrete structures and fire protection (iBMB), interviendra lors d'un exposé au LMT à l'ENS Cachan.

During cement hydration, the microstructure of the cement matrix and in consequence the mechanical properties of concrete are developing continuously. The properties of concrete at early ages may be of importance in several cases, e.g. to predict the temperature and stress development in massive concrete structures or to optimize processes on building sites and in precast plants.
The work presented in this contribution aims at a comprehensive description of the thermomechanical properties of early age concrete with suitable material models taking into account various influencing factors. The formulation of the material models is chosen allowing for a simple application in numerical simulations to predict the temperature, stress and strength development in hardening concrete structures.
An experimental program was carried out to study the heat release, the mechanical short term properties and the viscoelastic behavior of different concretes at early ages. The experimental results are used to analyze the influence of various parameters and to develop new or adapt existing material models. The main focus is on the viscoelastic behavior with special consideration of non-constant stress histories. A rheological model with aging spring and dashpot parameters is developed that gives a good agreement with experimental results for constant, stepwise changing and continuously changing stress. Thanks to the differential formulation of the constitutive equation, the model can be implemented straightforwardly into numerical simulation tools, while for classical creep functions a time consuming superposition is necessary.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
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