Microstructural approach and transfer water modelling in highly compacted unsaturated swelling clays
By N. Saiyouri, P. Hicher, D. Tessier. 2000
138 citations recorded by the source corpus.
A compacted smectite clay was studied in order to understand the swelling phenomenon. The influence of the sample initial state on the swelling mechanisms was demonstrated. A complete physical–chemical and mineralogical characterization of the clay was achieved using X-ray by reflexion and thermal methods. The X-ray diffraction by transmission method allowed to describe the various levels of the hydrated clay organization and the microstructure evolution. The pore distribution and the water partition are shown. Other important parameters: water retention, inter-layer distances, particle size, number of layers per particle were examined. This information gives the ability to follow the swelling which occurred in two steps, and to calculate the swelling potential versus the water content, or the void ratio. In application to this study, a water transfer in unsaturated clay was studied with the laws of continuous medium mechanics. A finite difference program was used to examine two cases: prevented and free swelling in an oedometer. In order to take into account the material deformation, the swelling potential was introduced in the diffusion coefficients. The simulation results of the water transfer obtained on this basis, were in good agreement with the experiments. Copyright © 2000 John Wiley & Sons, Ltd.
Subfields: Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/cc7820cc5a6ef51f8552c0b3c912cf61a87fb30c
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Civil and Structural Engineering
Citations in the corpus
- Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy (2008, background): “1973; Al-Rawas and McGown 1999), a topic that has recently gained increasing consideration within the context of claybased engineering barriers for radioactive waste disposal (Wan et al. 1995; Al-Mukhtar et al. 1996; Saiyouri et al. 1998; Romero et al. 1999; Pusch et al. 1999; Saiyouri et al. 2000; ”
- Swelling pressure of a divalent‐rich bentonite: Diffuse double‐layer theory revisited (2009, methodology): “Microscopic studies of bentonites by several researchers showed that within the clay aggregates, the clay fabric is mostly oriented, with the planar clay platelets remaining in a face to face arrangement [Blackmore and Warkentin, 1960; Grim, 1968; Barclay and Thompson, 1969; Tessier, 1984; Saiyouri ”
- Controlling suction by vapour equilibrium technique at different temperatures, application to the determination of the water retention properties of MX80 clay (2005, unknown): “…equilibrium technique is to place soil samples in a desiccator containing a salt solution, and the samples being supported by a rigid grid above the salt solution (Kanno and Wakamatsu 1993; Delage et al. 1998; Saiyouri et al. 2000; Graham et al. 2001; Romero et al. 2001; Leong and Rahardjo 2002).”
- Chemo-mechanical coupling in saturated porous media: elastic–plastic behaviour of homoionic expansive clays (2002, unknown): “However, whether particles tendency to break after absorbing more than four water layers, Saiyouri et al. (2000), is reversible remains unclear.”
- Ageing effects in a compacted bentonite: a microstructure approach (2006, background): “More recently, investigations using X-ray diffraction at low angles conducted on samples of compacted MX80 and FoCa 7 clays hydrated at various suctions ( Saiyouri et al., 1998, 2000 ) have been carried out.”
- Hydraulic conductivity and microstructure changes of compacted bentonite/sand mixture during hydration (2013, background): “The small-pores seemed to be compressed by the swelling pressure, whereas 2-D pores of 1 μm in diameter appeared due to the division of clay particles within the aggregates (Saiyouri et al., 2000).”