Slab Jacking, Slab raising, Floor raising, or Mud jacking
Inject fluid grout underneath sunken concrete slab or floor to completely fill all voids stabilizing it, and then raise the slab back to original elevation. Standard weight or cellular grout can be used.
Pogo Mine - Starting to inject grout at 1 psi to lift sunken 12" thick slab.
Pogo Mine - Just about finished lifting 2000 sq ft welding bay with embedded 80 lb RR rails in floor with 40 lb cellular grout.
Kotzebue - Starting to inject cellular grout to raise slab 9". Notice crack in sheetrock.
Kotzebue - Floor has raised, closing the crack and leveled shelves.