Condon Johnson (Jet Grouting Plant)



Condon- Johnson & Associates
Seattle, WA

24 m3/hr


  • Conceptual Design
  • Structural/Mechanical Engineering
  • Fabrication of all Equipment
  • Commissioning, Training & Site-Support.


  • SD 2000 Colloidal Mixer c/w 4 colloidal mills
  • Modified High Cube Container
  • Automated PLC/MCC Control System
  • Water Delivery & Pneumatic Systems
  • Centrifugal Grout Transfer Pump
  • Piping & Instrumentation

This batch plant is designed to produce cementitious slurry for jet grouting of soils in civil construction projects.

Storage silos supply bulk materials to the grout mixer, screw-conveying cement and other ingredients such as flyash and bentonite which are mixed with water and admixtures in a high shear colloidal mixer.

The colloidal mixer serves as a mixer and scale, weighing water, cement and other ingredients directly, while liquid admixtures are pumped in at the proper point in the sequence based on a calibrated run time.

Mixing is accomplished rapidly, discharging the finished grout via a heavy duty slurry pump into an agitation tank. Grout is held in the agitation tank and pumped on demand. The entire process is automated, with the agitation tank low-level sensor initiating subsequent batches.