Why is bentonite slurry commonly used in diaphragm wall construction?

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Bentonite slurry is one of the most common excavation fluid used in constructing diaphragm wall. Bentonite clay (in powder form) and water are combined in a colloidal mixer and clay particles bond to each other and set to form a gel when left to stand for a period of time. When the bentonite is set in motion, it reverts back to the fluid state rapidly.

Bentonite slurry shores the trench to stabilize the excavation and forms a filter cake on the slurry trench walls that reduces the slurry wall’s final soil permeability and to reduce ground water flow. The gel strength and viscosity properties of the bentonite clay allow for cutting suspension and removal.


This question is taken from book named – A Closer Look at Prevailing Civil Engineering Practice – What, Why and How by Vincent T. H. CHU.

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  • sudhanshu singhal September 28, 2011 at 3:32 am

    that’s a perfect reoson for use a bentonite slurry in construction of D-wall…………..

  • Uday S Joshi January 29, 2012 at 1:53 pm

    Why Bentonite properties Kept different at the time of grabbing, Cage lowering and before concreting?

  • Raj April 4, 2012 at 10:22 am

    how can increase slurry density in bentonite, pl advise…

  • Songhonron Michael December 14, 2012 at 9:06 am

    Apart from stabilizing excavated walls, is it right to say that Bentolite Slurry can displace sand in a bored pile case after boring.

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