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Communication Dans Un Congrès Année : 2017

A Possible Nano-Scale Origin of the Surprising Thermal Expansion of Clays

Laurent Brochard
Túlio Honório
Matthieu Vandamme
Ioannis Stefanou
Siavash Ghabezloo
Michel Bornert

Résumé

Clays thermo-mechanics are complex with thermal expansions or contractions, reversible or irreversible, depending on the loading history and the range of temperature. Some key experimental observations are well captured by a recent thermomechanical model considering water adsorption at the heart of the thermo-mechanical couplings. In this paper, we investigate a peculiar experiment that shows an effect of temperature on preconsolidation pressure. This experiment is interesting because it highlights a significant effect on the plastic behavior whereas the temperature change is applied after unloading in the elastic domain and induces only small reversible deformations. Accordingly, the phenomenon cannot be attributed to any change of microstructure. The model based on adsorption reproduces this experimental result and offers a nanoscopic interpretation of the effect of temperature on preconsolidation pressure. This finding further supports adsorption as central to the physical origin of the thermo-mechanical couplings in clays.
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Dates et versions

hal-01686247 , version 1 (20-06-2018)

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Laurent Brochard, Túlio Honório, Matthieu Vandamme, Ioannis Stefanou, Siavash Ghabezloo, et al.. A Possible Nano-Scale Origin of the Surprising Thermal Expansion of Clays. Sixth Biot Conference on Poromechanics, Jul 2017, Paris, France. pp.626, ⟨10.1061/9780784480779.077⟩. ⟨hal-01686247⟩
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