Soil and concrete are constantly moving. When you have poor compaction and erosion involved, things REALLY move. Sidewalk slabs are forever shifting and one of the quick and inexpensive "fixes" is to grind the concrete down to level.
One of the problems is that grinding leaves unsightly marks on the finished surface, which some people don't necessarily mind. But for those that have decorative finishes on driveways and pool decking, this is a serious concern that they should know about ahead of time.
The real concern here is that the REASON the concrete settled in the first place. Most likely poor compaction or erosion has affected this area, causing slab movement. When grinding the slab, you are essentially shaving off the top side to make level for walking. Nothing is done to stabilize the soil beneath the slab, and so there is a very good chance for resettlement in the future. Especially since water has now found it's way past the walkway or path of least resistance.
By injecting structural grade polyurethane material below the slab and lifting the slab back toward original position, you've now pushed down (or compacted) the compromised soil, void filled where soil has been eroded out, and lifted the slab back up. From the top, the sidewalk looks like it did years ago, the colors all match and the slabs are fully supported.
Believe it or not, lifting and leveling sunken concrete pricing is very cost effective. We always suggest that homeowners look at all of their options before making a decision. Compare the pros & cons, pricing and estimated time the fix will last.
To find out more about lifting and supporting settled concrete slabs, contact us today 770-558-5862 or email firstname.lastname@example.org