Crumbling concrete can be repaired, but the extent of the repair will depend on the severity of the damage. Minor cracks and chips can be filled in with a concrete filler or patching compound and then smoothed out. More significant damage may require more extensive repair techniques such as concrete resurfacing or slabjacking.
Slabjacking is a process that involves drilling small holes in the concrete and injecting a grout mixture beneath the slab to lift it back into place and stabilize it. Resurfacing involves applying a new layer of concrete over the existing surface. It is important to address concrete damage as soon as possible, as it can worsen over time and become more costly to repair. A professional contractor should be consulted to assess the damage and recommend the appropriate repair method.