CB-walls are water-resistant walls formed in the ground, built using a cement-bentonite mixture.

A trench is dug and filled with a cement-bentonite mixture, which hardens after a while. A wall with very low water permeability is formed. If necessary, Soetaert can add a sheet pile or PE-foil, to give it an extra water- and/or soil retaining feature.

CB-walls are ideal to contain pollution

CB-walls are often used to contain pollution so it cannot spread via horizontal groundwater streams. The technique is perfectly applicable to limit drainage during large infrastructure works.

Soetaert constructed its first CB-walls in the Port of Antwerp in 2020. There, we circled a strongly polluted site with CB-walls to prevent the spreading of the contamination. Ever since, we’ve regularly performed CB-wall projects.


  • Vibration-free execution
  • Little noise
  • Highly water-resisting
  • Ground and bentonite draining


CB-walls are mostly suitable to contain pollutions and limit the amount and influence zone of drainage. The technique can be executed in almost all soil types.