07:43PM | 09/14/03
Member Since: 12/07/02
8 lifetime posts
I'm noticing the cracks in my driveway are progressively worsening. Today while I was untangling electrical cord I noticed that when the plug hit the driveway it sounded hollow underneath. Does anyone know what might be the cause of this? Not knowing any better a sinkhole came to mind. The cracks in the same area have gotten much worse this year and there are even fragments of concrete within the crack in one spot. Any advice about the cracks and hollow sound would be appreciated. Thanks.

Glenn Good

01:18PM | 09/15/03
Member Since: 09/10/03
314 lifetime posts
There is any number of possibilities as to the cause. Anything from poor construction, to poor quality concrete, to concrete poured during freezing temperatures and left unprotected, etc.

One common occurrence I have found several times in this situation is when a drain line (usually a storm water drain of some sort) runs under the concrete and has a hole or a bad joint in it allowing water to exit and re-enter the hole taking some of the dirt with it. This will cause a void under the concrete over time and until it is repaired will continue to worsen. This is only one of many possibilities though. If there is a downspout drain or any other type of drain that you know of in the immediate vicinity it would be a very distinct possibility.



08:46AM | 04/27/04
Member Since: 04/26/04
3 lifetime posts
Oneof the tests for professional concrete restoration projects is called a 'chain drag'. They drag a heavy chain over cement and listen for a hollow sound. These areas are then outlined, cut out and new concrete poured. The reason is that the rebar in the concrete has started to rust which puts tremendous psi pressure on the cement popping it out and creating pockets where the oxidization can get out. Sounds like you might consider replacing the driveway if the spots are many and large. If you're talking one or two small spots, it might make sense to drill out these areas and use patching compounds to fix the areas.

good luck !
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