How to fix a sinkhole in a concrete driveway with no doubt
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If the sinkhole is under a house, or other structure, then assessment and repair is more complicated. Ignoring this step can mean the next repair is an entire sinking driveway. First off, the surface area in question needs to be prepared for the repair process.
Fill the hole with concrete.
If your sidewalk hasn't heaved by now, then the addition of new concrete below it isn't going to change anything. The sinkhole will not go away until the underground debris is fully cleaned out and removed. How to repair dips in asphalt driveway. A sinking, cracked concrete slab can be a symptom of a more serious problem.