Concrete floor repair question

[blinn]

I need some advice on what to do in my garage. We have a garage that the concrete was poured over a metal deck on half of the slab. The other half the concrete was poured over dirt. Over the past 10 years or so the metal deck poured side has popped the concrete in a few areas along the middle edge of the expansion joint. These areas are not huge but are maybe 6-8 inches. Also, the poured over dirt side has settled a bit, maybe 1/2” to 3/4” in some areas along the expansion joint. It does not seem structural but I would like the entire garage to be uniform and want to install some sort of epoxy or other coating.

One reason that I have not done an epoxy coating is if I patched the places that have popped, it will probably flake off or pop again and the patching the epoxy is not ideal. Also, the settling on one side I want to fix and that would take a repour over all of it to make is look uniform. I do have a 4 post lift on the side that was poured over the dirt. In order to get one car on the lift and another under it I don’t have much height to play with! Any significant thickness of the floor might be a problem

I appreciate all advice and opinions here, just thinking all the way through my options.

Brian

 

[SolarColumbia]

Could you post some pics?

 

[nadogail]

Pictures will save a lot of words in describing your situation.

 

[blinn]

Here are a couple.




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[ConCretin]

Inadequate compaction of the base under the slab on grade caused settlement, which caused cracking and spalling at the joint. The only permanent repair is to remove and replace a strip of slab along the construction joint. After the existing slab is removed, evaluate the soils below for potential sources of subsidence. If none, proof roll and build the base back up before replacing slab. Anything less is just a bad aid.

 

[blinn]

Not so easy, read my original post. That cracked out part is the section over the metal deck. The half that was poured over the dirt base has not cracked. 20+ year old house.


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[ConCretin]

OK. Got it. Are there some rebar dowels between the two sections? No cracks in the slab that settled?

 

[blinn]

Maybe a couple hairline fractures but nothing else. I have no idea if there was rebar between the two halves of the slab.

 

[ConCretin]

The only reason I can think of for the slab on metal deck to spall like that is dowels across the joint being forced upward as the slab on grade settles. It looks like there might have been a dowel in one of the pics that sheared off. I'll bet you find more if you do some checking.

In any case, I wouldn't invest a lot of money in an epoxy floor covering until I addressed the underlying issues. I'd still remove and replace a section of the slab that settled. You can probably repair the damage to the slab on deck once the cause is addressed.

 

[blinn]

So what type of a company do I need to call to look at it and do the work? Just someone that repairs concrete or other?


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