TY - GEN
T1 - A Possible Nano-Scale Origin of the Surprising Thermal Expansion of Clays
AU - Brochard, L.
AU - Honorio, T.
AU - Vandamme, M.
AU - Stefanou, I.
AU - Ghabezloo, S.
AU - Bornert, M.
N1 - Publisher Copyright:
© ASCE.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85026290733
U2 - 10.1061/9780784480779.077
DO - 10.1061/9780784480779.077
M3 - Conference contribution
AN - SCOPUS:85026290733
T3 - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
SP - 626
EP - 633
BT - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
A2 - Dangla, Patrick
A2 - Pereira, Jean-Michel
A2 - Ghabezloo, Siavash
A2 - Vandamme, Matthieu
PB - American Society of Civil Engineers (ASCE)
T2 - 6th Biot Conference on Poromechanics, Poromechanics 2017
Y2 - 9 July 2017 through 13 July 2017
ER -