~ Technihouse Tips ~ Mud-jacking concrete
If you have a big driveway, patio or walk that is not broken and cracked, but has just sunk or is uneven, check the yellow pages for concrete repairing companies. Settled concrete can be mud-jacked back into place. They drill holes in the concrete and pump slurry into the holes, which raises and levels the uneven concrete slab. This is a lot more inexpensive than having to replace the concrete.