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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:20261002T033647Z
UID:4c0c06569a1a9e964f3e1a0b80207d0f761c22348ae453867e7346af
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Mario Manassero\nSodium Bentonites are clayey soils char
 acterized by a high specific surface and a permanent negative electric cha
 rge on the solid skeleton. Their increasing use as hydraulic and contamina
 nt barriers for landfills and soil remediation applications\, including th
 e final disposal of nuclear waste\, needs to be supported by adequate theo
 retical modeling of their mechanical behavior and transport properties\, i
 n order to assess the expected performance with particular reference to th
 e long term.\nTo this end\, a theoretical framework has been proposed in o
 rder to derive constitutive equations for the coupled chemical-hydraulic-m
 echanical behavior of sodium bentonites. Their solid phase is assumed to b
 e constituted by montmorillonite lamellae having a slit-like geometry\, wh
 ich can be aggregated to form the so-called tactoids. Chemical equilibrium
  is assumed to be established between the bulk external electrolyte soluti
 ons and the internal pore solution at the macroscopic scale\, so that the 
 hydraulic pressure and ion concentrations can be evaluated through the Don
 nan equations. Water and ion transport is described at the pore scale thro
 ugh the generalized Navier- Stokes equation and the generalized Nernst-Pla
 nck equations\, respectively. Mechanical behavior is modeled taking into a
 ccount inter-granular contact stresses and electro-static attraction and r
 epulsion forces.\nThe proposed theoretical approach has been applied to in
 terpret a series of experimental results from  many  authors  (Malusis
   and  Shackelford\,  2002\;  Malusis  et  al.\,  2013\;  Dominija
 nni  & Manassero\, 2011 and Dominijanni et al. 2012 among others) and a n
 umber of laboratory tests on natural\, pretreated and polymer-modified ben
 tonites carried out at Politecnico di Torino using an osmotic cell specifi
 cally designed and setup for this research program.\nBio: Mario Manassero 
 has been professor of Geotechnical Engineering at Politecnico di Torino si
 nce 2002. He received his Ph.D. from the same university in the 1987. He i
 s Chairman of Technical Committee (TC) no. 215 "Environmental Geotechnics"
  of the International Society for Soil Mechanics and Geotechnical Engineer
 ing (ISSMGE)(2001-2014). His main research activities are devoted to the g
 eotechnical characterisation of soil deposits using in-situ tests\, soil i
 mprovement and reinforcement methods\, containment systems for landfills a
 nd polluted subsoils\, the mechanical behaviour of municipal and industria
 l wastes\, the chemo-physical interaction between pore fluids and the soli
 d skeleton\, multiphase coupled flows and associated transport phenomena.
LOCATION:GC B331
STATUS:CONFIRMED
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