%0 Conference Proceedings %T Transport of water in a weakly-hydrated model clay soil %+ Department of Physics [Trondheim] (Physics NTNU) %+ Géosciences Rennes (GR) %A Ramstad Alme, L. %A Fossum, Jon %A Méheust, Yves %< avec comité de lecture %Z PL02262 %( Geophysical Research Abstracts %B European Geosciences Union General Assembly 2008 %C Vienne, Austria %V 103 %P EGU2008-A-10512 %8 2008-04-13 %D 2008 %Z Sciences of the Universe [physics]/Earth Sciences/HydrologyConference papers %X We address the transport of water through a model soil consisting of a looselyaggregated powder of swelling clay (smectite) nano-layered particles. Water has the ability to intercalate stepwise into the nano-porous layered structure of such smectite particles (hence, the term water layers[1]). This makes water transport through the inter-particle clay powder mesoporosity a complex phenomenon, since (i) part of the humidity is trapped in the surrounding particles, and (ii) the particles swell as a result of water intercalation, which leads to a change in the geometry of the mesopores. By imposing a humidity gradient along clay powder samples contained in cylinders and kept at fixed temperature, we have studied quasi-one dimensional water transport in such systems[2,3]. X-ray scattering from the nano-stacks, resolved both in time and in space, provides information on the spatial ingress of the humidity front in the meso-pores, as well as on the amounts of water intercalated in the particle nano-pores. The two interlinked fronts, i.e., humidity (in meso-pores) and intercalation (in nano-pores), have been analyzed together in terms of the classic diffusion scaling variable x/t /2. The result of this analysis suggests near normal diffusive behavior, i.e., an anomalous diffusion exponent close to 1 [4]. %G English %L insu-00381719 %U https://insu.hal.science/insu-00381719 %~ INSU %~ UNIV-RENNES1 %~ CNRS %~ GR %~ OSUR %~ GIP-BE %~ UR1-HAL %~ UR1-SDLM %~ UR1-SDLMJONCH %~ GR-DIMENV %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ UR1-ENV %~ GR-TERA