Soil mixing techniques are used for the construction of soil-cement elements. This involves breaking up the prevailing soil matrix and mixing it in-situ with the self-hardening slurry. The shape of the soil-cement element is determined by the various mixing tools used. Possible forms of construction are single columns or rectangular panels. A continuous soil mixing wall is constructed by installing overlapping elements in an alternating sequence. Soil mixing techniques have a wide range of applications and offer cost-effective solutions.

CSM originates from and uses components of the Bauer Trench Cutter Technique. Cutter wheels break up the soil matrix and mix it with cement slurry to a homogeneous soil-cement mortar. The system is applicable in various soil conditions – even in hard or layered strata. It is mainly used for the construction of cut-off and retaining walls.

With the in-situ mixing technique SCM (Single Column Mixing), the individual mixing tool (mixing paddle with starter auger) is inserted into the soil resulting in thorough mixing of the prevailing soil with a binder. This is injected through the drill string during insertion of the tool. The binder can be provided either in dry or in slurry form. Depending on the system used, the binder can be available at the mixing tool either at high or at low pressure.
Key advantages of the technique:

The SMW system is an economic method for the construction of cut-off and retaining walls. Mixing self-hardening slurry in-situ with native soil (SMW system) offers a cost-effective technique for the construction of cut-off and retaining walls. Three parallel mixing paddles are driven by three independent rotary drives. They mix the soil with the slurry which is injected through the drill system. A continuous wall is constructed by installing overlapping elements in an alternating sequence.