Permeation and Compaction Grouting

Permeation grouting injects a low-viscosity grout into the pores of granular soils without disturbing their structure. This bonds the soil particles, increasing strength and reducing permeability. It is used for water cut-offs, foundation strengthening and ground stabilisation beneath sensitive structures.

Compaction grouting uses a thick, low-slump mortar injected under pressure to displace and densify loose soils. It forms grout bulbs that push particles together, increasing density and bearing capacity. It is useful for settlement mitigation, underpinning and void filling in cohesive or low-permeability soils.

Tube-à-Manchette (TAM) grouting delivers grout through a perforated pipe fitted with rubber sleeves that open under pressure. This allows multiple controlled injections at precise depths and zones. It is applied in permeation and fissure grouting where accuracy and repeatability are critical, such as around shafts or beneath sensitive foundations.