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SUMMARY:CESS Seminar:   Experimental assessment of the fabric and state pa
 rameters of active clays for modelling their hydro-chemo-mechanical behavi
 our
DTSTART:20181012T121500
DTEND:20181012T130000
DTSTAMP:20260427T203149Z
UID:619d6f1154889f939f4de91c48e57271ef9aa15631b40f7bf6a4598e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Mario Manassero (Politecnico di Torino) is the Vice-Pres
 ident for Europe of the International Society of Soil Mechanics and Geotec
 hnical Engineering (ISSMGE) for the term 2017-2021. He obtained his Civil 
 Engineering degree in 1980 at Politecnico di Torino and received his Ph.D.
  at the same university in 1987. He has been visiting professor at Univers
 ity of Ancona (Italy) from 1988 to 1993\, Ghent University (Belgium) in 19
 96 and at Colorado State University (USA) in 1995. Since 1998\, he has bee
 n professor of Geotechnical Engineering at Politecnico di Torino.\n\nAbstr
 act. The osmotic\, hydraulic and self-healing efficiency of bentonite base
 d barriers (e.g. geosynthetic clay liners) for containment of polluting so
 lutes are governed both by the physico-chemical intrinsic parameters of th
 e bentonite\, i.e. the solid phase density (ρsk)\, the total specific sur
 face (S)\, and the total fixed negative electric surface charge (s)\, and 
 by the state and fabric parameters able to quantify the soil density and m
 icrostructure\, i.e. the total (e) and nano (en) void ratio\, the average 
 number of platelets per tactoid (Nl\,AV)\, the effective electric fixed-ch
 arge concentration ()\, and the Stern fraction (fStern). In turn\, the fab
 ric parameters seem to be controlled by the effective stress history\, ion
 ic valence and related exposure sequence of salt concentrations in the por
 e solution. A theoretical framework\, able to describe the coupled chemica
 l\, hydraulic and mechanical behaviour of bentonites\, has been set up. In
  particular\, the relationships\, which link the aforementioned intrinsic\
 , state and fabric parameters of a given bentonite with its hydraulic cond
 uctivity (k)\, effective diffusion coefficient ()\, osmotic coefficient (w
 ) and swelling pressure (usw) under different stress-histories and solute 
 concentration sequences\, are presented. The proposed theoretical framewor
 k has been validated through the comparison of its predictions with some o
 f the available experimental results that have been obtained through the u
 se of the last version of an ad hoc equipment able to detect\, within a un
 ique time step\, all the aforementioned performance parameters\, apart the
  hydraulic conductivity (k) that has been anyway measured by just a furthe
 r time step carried out always with the same equipment and on the same ben
 tonite sample.\n 
LOCATION:GC B1 10 https://plan.epfl.ch/?room=GCB110
STATUS:CONFIRMED
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