Jet Grouting is a ground improvement technology used to mix the insitu soils with cement to create a soil cement column. The systems can be single, double or triple fluid jet grouting. The common element to all three is the cement grout. The double fluid systems involve using another fluid (typically air) to increase the velocity of the jet to better scour the soil. Triple fluid systems typically use water and air to scour the material and grout is delivered via a third nozzle. (Photo courtesy of NCS Consultants, LLC)
The Jet Grouting Task Force of the Grouting Committee of the Geo-Institute of the ASCE (phew!) has prepared a guideline document that will be of use to any owner, engineer or contractor involved in a jet grouting project, and it reads like an outline for a specification but with commentary. The task force was made up of representatives from contractors (including Nicholson Construction and Geosystems, Hayward Baker and Bechtel), owners (including USBR, FHWA) and consultants (too many to list).