Permeation grouting fills cracks or voids in soil and rock and permeates coarse, granular soils to create a cemented mass. Typically carried out with Portland cements in suspension with water, in some instances chemical ‘solution’ grouts can be used. Keller’s fleet of low headroom, tight access rigs minimises disruption to normal facility operations.
- Create barriers to groundwater flow
- Underpin foundations
- Provide excavation support
- Stabilise and strengthen granular soils
Permeation grouting, also known as cement grouting or pressure grouting, fills pores in granular soil or voids in rock/soil, with flowable particulate grouts. The grout particle size and void size must be matched properly to allow the cement grout to permeate. Depending on the conditions, Portland cement or microfine cement grout is injected under pressure at strategic locations through single ‘port’ or multiple ‘port’ pipes. The grouted mass has an increased strength, stiffness, and reduced permeability.
Permeation grouting can offer an economic advantage for underpinning applications over alternative approaches such as removal and replacement or piling, and can be performed where access is difficult and space is limited. Since the effectiveness of permeation grouting is independent of structural connections, this technique is readily adaptable to existing foundations and can typically be accomplished without disrupting normal facility operations.