What is the difference between concrete raising, leveling, lifting, and slab jacking?

These terms all describe the same goal: returning a sunken slab to a level position by filling the empty space underneath it. “Slab jacking” and “mudjacking” historically referred to pumping a cement slurry under the slab, while “concrete leveling” and “concrete lifting” today most often refer to modern polyurethane foam injection. Acme specializes in the foam method through our Smart Lift System.