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SUMMARY:Coupled Osmotic and Swelling Phenomena within Sodium Bentonites fo
 r Pollutants Containment Barriers: Theoretical Aspects and Potential Appli
 cations
DTSTART:20131212T121500
DTEND:20131212T131500
DTSTAMP:20260510T000035Z
UID:75546c64dbd721e4d01d46c9a4fe680ff5523584d261adad8147c48b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Sodium Bentonites are clayey soils characterized by a high spe
 cific surface and a permanent negative electric charge on the solid skelet
 on. Their increasing use as hydraulic and contaminant barriers for landfil
 ls and soil remediation applications\, including the final disposal of nuc
 lear waste\, needs to be supported by adequate theoretical modeling of the
 ir mechanical behavior and transport properties\, in order to assess the e
 xpected performance with particular reference to the long term.\nTo this e
 nd\, a theoretical framework has been proposed in order to derive constitu
 tive equations for the coupled chemical-hydraulic-mechanical behavior of s
 odium bentonites. Their solid phase is assumed to be constituted by montmo
 rillonite lamellae having a slit-like geometry\, which can be aggregated t
 o form the so-called tactoids. Chemical equilibrium is assumed to be estab
 lished between the bulk external electrolyte solutions and the internal po
 re solution at the macroscopic scale\, so that the hydraulic pressure and 
 ion concentrations can be evaluated through the Donnan equations. Water an
 d ion transport is described at the pore scale through the generalized Nav
 ier- Stokes equation and the generalized Nernst-Planck equations\, respect
 ively. Mechanical behavior is modeled taking into account inter-granular c
 ontact stresses and electro-static attraction and repulsion forces.\nThe p
 roposed theoretical approach has been applied to interpret a series of exp
 erimental results from  many  authors  (Malusis  and  Shackelford\, 
  2002\;  Malusis  et  al.\,  2013\;  Dominijanni  & Manassero\, 2011
  and Dominijanni et al. 2012 among others) and a number of laboratory test
 s on natural\, pretreated and polymer-modified bentonites carried out at P
 olitecnico di Torino using an osmotic cell specifically designed and setup
  for this research program.\nBio: Mario Manassero has been professor of Ge
 otechnical Engineering at Politecnico di Torino since 2002. He received hi
 s Ph.D. from the same university in the 1987. He is Chairman of Technical 
 Committee (TC) no. 215 "Environmental Geotechnics" of the International So
 ciety for Soil Mechanics and Geotechnical Engineering (ISSMGE)(2001-2014).
  His main research activities are devoted to the geotechnical characterisa
 tion of soil deposits using in-situ tests\, soil improvement and reinforce
 ment methods\, containment systems for landfills and polluted subsoils\, t
 he mechanical behaviour of municipal and industrial wastes\, the chemo-phy
 sical interaction between pore fluids and the solid skeleton\, multiphase 
 coupled flows and associated transport phenomena.
LOCATION:GC B331
STATUS:CONFIRMED
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