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Concrete Cracks

Posted by Drew on November 25th, 1997 12:32 PM
In reply to New Home Concrete Foundation by YRiojas on November 24th, 1997 09:57 PM [Go to top of thread]

After finishing up my study of aggregate,
compaction, and concrete, there are a couple, of
reasons why the cracks are there. The first I
think of is that the concrete was not cured the
proper way. From what I gather from you, the
floor of the first floor is the slab, and somehow
as the concrete was cureing water evaporated too
fast leaving small cracks, not deep at all. Second
reason might be that the soil, or fill under the
slab was not compacted the correct way and now the
concrete is settling. Third is when the concrete
was poured the wrong size rebar mesh was used and
the mesh was on the bottom of the slab. Last reason
I can think of is that the concrete mix was an
inproper mix for the application. In reference to
complaning, I would first talk to the concrete company
and see what mix they used, along with the slump,
of the mix, and air content of the mix, also see
if they used a admixture. If that checks out fine.
Talk to the contractor who compacted the grade for
the slab and see what tests he ran. Like compaction
tests, and tests on the fill he used. If that checks,
talk to the contractor who placed the concrete mesh,
and see what size he used and ash where he placed it
when the concrete was poured. It is very uncommon
to find these cracks and I would start to find the
answers. Most Bull shi- contractors like to skip
steps to cut corners and tests as well to save money,
it might sound like this is what happened to your
friend. Any questions you or your friend can
email me at

good luck

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