You will want to add some reinforcement wire to prevent fracturing and probably use a surface preparing glue.
Do yourself concrete lifting.
Cut through slab with gas powered saw fitted with 12 inch diamond blade.
Basically you clean the concrete buy a bag of cement mix it up and dump it on top finish it yourself.
Fast setting concrete is necessary to patch the holes when you re finished filling them up.
With a concrete drill or masonry bit drill small holes into the sunken area and slowly pour a thin mixture of cement into the holes.
And yes it is a foam just like your beloved spray foam.
Foam jacking also known as polyfoam or polyjacking is a modern version of mudjacking that levels concrete slabs in a less invasive way.
Injection holes are strategically drilled into the concrete slab s that requires lifting.
Use the brick chisel and sledgehammer to undercut any edges of the sunken concrete as necessary.
Hiring a professional service to lift or jack up the slab can be costly.
You can avoid this expense if you do it yourself with the help of a jacking pump which can raise the concrete slab to the needed level.
Concrete lifting with a small sledge hammer brick chisel and drill this is another method for doing it yourself.
Geolift works for driveways sidewalks patios garage floors even pool decks.
That ll allow the sunken slab to lift up.
High density polyurethane foam is injected into holes that expand to lift and level the sunken concrete.
Mix a small batch of fast setting concrete.
Lifting a sunken slab may be necessary to level the surface.
Geolift works in three steps.
Hack to fix sunken concrete.
You should also get a steel.
Add some of the concrete dust removed from the holes after drilling to the mix to tint the mix the same color as the slab.
Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor.
Use diamond tipped core drill to bore several large diameter holes through slab.
Get a carpenter s level to make sure that you don t overfill the slab too high.
The first step is to drill holes in the problem concrete.
In time however concrete slabs can crack or sink due to pressure or from movement during settling.
The equipment is contained in a trailer rig with a long hose capable of reaching direct to the concrete slab location.
Otherwise you could crack the concrete.