Quote:
Originally Posted by CigarMaster
bump to BrainL99
Priority #1- it sank for a reason, locate reason
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I've had a lot of concrete poured. Poured 308 CY last week in a single pour. 20 degree temps, not optimal.
There is generally only one reason concrete "sinks" ... poor preparation. Concrete, no matter how carefully you prepare, pour & cut, can always "crack", but it generally doesn't sink unless the prep was poor.
In my opinion, using any sort of "jacking" is putting a band-aid on the problem and it's likely to be only a temporary fix .... the underlying problem will still be there.
For what's it worth, I manage the construction of auto dealerships. We pour very large slabs. The one we poured last week, is a 3 story parking garage. I can't afford to have a "sinking problem".
Here's how we do it in the Commercial Construction world.
All concrete work is spec'd by a Structural Engineer, including the "base". A 3rd party verifies the base and that the reinforcing steel rods are properly installed. The same 3rd party verifies the concrete as it's poured, from each & every truck and usually takes at least 6 sample cores from each truck load. Those cores are then "broken" at 7 day intervals, so we know the strength of the concrete, meets design standards.
If I had a slab sink (we pour to about 1/10" tolerance), I'd immediately do test borings to determine what was going on. Once I figured out the issue, we'd try to remedy the underlying cause. 99.99% of the time, it's going to be improper preparation beneath the pour.
I know, more than most anyone needs to know about concrete slabs.