Chemical grouting | pressure grouting is an excellent alternative to deep foundation repairs in the case of unconsolidated granular soils below foundations.
Chemical grouting increases the strength and stiffness of granular soils by transforming the soil into solid stone-like masses by filling the voids with a low viscosity, non-particulate solution grout. The chemical grout is pressure-injected through a pipe into cohesion-less soils. As it permeates the soil, the chemical grout binds soil into a solid mass and improves the soil’s bearing capacity. Chemical grouting is best suited for clean sands and or gravel. This soil stabilization procedure offers the advantages of being easily performed where access and space is limited, and where no structural connection to the foundation being underpinned is required. A common application of chemical grouting is to provide both excavation support to prevent settlement of existing structures adjacent to an excavation.
Permeation Grouting (chemical and particulates) are both used as an economical technique to stop leaks in mines, tunnels, underground tanks, elevator shafts and around underground conduits and pipes. Permeation grouting is injected through holes placed along cracks, joints or along water path zones. The grout injection can be done from the inside of structures or from outside depending on access to the work area.