Dry or Wet Soil Mixing?

GDL has the capability can offer both Wet and Dry Soil Mixing Systems as ground improvement specialists. Our team of ground engineering experts will apply our technical expertise, using the correct methods to overcome whatever challenging soil conditions your construction project may face. 

Wet VS Dry Soil Mixing   

Wet soil mixing involves the mixing of a liquid cement grout with the soil whereas dry soil mixing involves the addition of dry cement as a powder.

The use of Wet Soil Mixing is much more prominent in the UK. Below we list the differences between each; 

Initial water content of the soil to be treated – Cohesive soils moisture content (w) = 60-200% are best suited for dry process. Lower limit of 20% generally for sufficient moisture available to facilitate hydration.

Quality of mixing – Wet process normally provides better homogeneity of stabilised soil owing to easier distribution of slurry across the column area, pre-hydration of cement and longer mixing time

Compressive strength of the soil-binder mix – Higher strength more reliably obtained with wet process (except in very wet soils).

Ability to penetrate to stiffer soil layer – Much higher for wet process owing to lubrication of injected slurry and high rig torque

Stratified soils – Wet mixing can provide more uniform strength along the column length due to partial soil exchange / movement in the vertical profile; quality control generally more difficult in dry mixing

Use of combined binders / industrial by-products – Frequently used in dry and wet processes particularly GGBS.

Column reinforcement – Possible in wet process.

Air temperature below 0°C – Dry process is significantly less effected by low temperatures as compressed air is used to transport binder