Experimental study of swelling in unsaturated compacted clays
By N. Saiyouri, D. Tessier, P. Hicher. Clay minerals, 2004
218 citations recorded by the source corpus.
Abstract This paper describes the swelling properties of two highly compacted clays, natural, untreated Wyoming montmorillonite (MX80) and Fourges smectite (FoCa7), saturated with Na and Ca, respectively. The initially compacted samples were hydrated by subjecting them to different suction pressures in a range between 100 MPa and 1 kPa. For each equilibrium state, the volume change (swelling) and water content (hydration) were measured. The samples were then studied by X-ray diffraction using a transmission device to determine interlayer distance and particle size, in order to clarify both the swelling and hydration mechanisms. The distances between clay layers ranged between 10 and 21.6 Å , i.e. corresponding to between 0 and 4 water layers. Upon hydration, the particle size decreased from 350 and 100 clay layers per particle to 10 layers per particle when the suction pressure decreased from 100 MPa to 1 kPa for MX80 and FoCa7, respectively. The first swelling stage is described as being an insertion of water molecules between the layers. Then a division of the initial particles into particles of smaller size with increasingly large inter-particle distances was observed. Observations by transmission electronic microscopy confirmed these results.
Subfields: Biomaterials, Civil and Structural Engineering, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/1d5969e32ac21a05870422f4ea30e522f013bc5d
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In Biomaterials
In Civil and Structural Engineering
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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; ”