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SUMMARY:Long term performance and in-situ assessment of cement-bentonite c
 ut-off walls. - Kaushal Joshi\, CUED
DTSTART:20071116T163000Z
DTEND:20071116T173000Z
UID:TALK8331@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Cut-off walls are in-situ vertical barriers constructed in ord
 er to enclose an area of contaminated ground. These walls have very low pe
 rmeability to control the groundwater flow into or out of these confined s
 ites.  The use of cut-off walls made from cement-bentonite slurry has beco
 me more widespread in the last two decades in the UK\, Europe and Japan. H
 ence\, there is a need to investigate their long term performance using fi
 eld monitoring as well as laboratory testing. This research has thus been 
 conducted on 11 year old field cut-off wall material along with freshly pr
 epared laboratory samples to study their permeability\, strength – defor
 mation and durability properties. \n\nThis presentation will mainly cover 
 four aspects of research\, namely the permeability and UCS (unconfined com
 pressive strength) laboratory test\; in-situ test\; triaxial strength test
 \; and durability characteristics. Furthermore\, various parameters such a
 s aging\, contaminant exposure\, mixing of surrounding contaminated soil\,
  depth of wall\, ground water fluctuations and weathering actions\, which 
 can affect the performance of these containment walls will be identified i
 n this presentation. By taking into account the influence of the above men
 tioned parameters\, the design and long-term performance of cement-bentoni
 te containment systems could be improved.\n
LOCATION:Engineering Department - LR6
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