Chemical grouting increases the strength and stiffness of the soil by transforming granular soils into a solid stone-like mass. The polyurethane grout is pressure-injected through a pipe into low-cohesion soils. As it permeates the soil, the chemical grout converts soil into a solid mass with reduced permeability. Chemical grouting is best suited for sands and for soils above the treatment zones for compaction grouting.
Uses of Chemical Grouting
Chemical grouting is used for:
Underpinning of existing foundations
Creating support walls for excavation
Stabilizing soils for tunneling
Creating water-cutoff walls
Common areas for chemical grouting are pool decks, sidewalks and beneath slab foundations.
Benefits of Chemical Grouting
Can usually be completed without interrupting facility operations
Viable in difficult-to-access areas
Ideal for areas where space is limited
Does not require structural connection to a foundation