Rock grouting is normally done in fissured rock to reduce the flow of water along the joints and discontinuities in the rock.

Rock/fissure grouting illustration

Common uses

Reduce conductivity/transmissivity via interconnect porosities in an aquifier
Increase resistance against deformation


Grout is typically injected in isolated stages from boreholes drilled using rotary percussive drills. Reduction in permeability is a function of the grouting material, the rock and grout design. Rock grouting is typically performed with general purpose, ultra-fine or micro-fine Cement.

Keller offers other methods of grouting to cater to the needs of each project and ensure optimal outcomes. This includes techniques such as Polyurethane Grouting (PU Grouting) and Bentonite Cement Grouting (BCG).


Can be effective in reducing ground water flows
Reduce pumping costs during basement excavation
Reduced lowering of groundwater levels outside an excavation
Can reduce rock deformation

Quality assurance

Keller has industry leading knowledge of grout materials and mixes and uses the latest drilling techniques to minimise borehole deviation and maximise efficiency. It can also apply sophisticated computerised control and reporting of the grout injection process.