Replacing or Repairing Concrete: If your concrete has cracked dramatically, or deteriorated, it might make sense to replace your sunken slab. A new slab has its appeal, but a new pour will most likely not match the concrete in color or texture.
Mud Jacking: Mud Jacking, a method sometimes used when retaining wall weep holes clogged, is a common term for lifting sunken or settled concrete.
Polyurethane Foam: Polyurethane foam injection uses a closed cell polymer foam to lift concrete slabs.