I need to have our concrete driveway replaced , and I'm clueless! One guy
says 4" of concrete with fiber (?) mixed and steel mesh. Another guy says 4
" and fiber mesh ("that's what we're doin' these days"). One of the few
articles on the web says go with 5" and steel. We're in N. Florida, so
freezing's not a problem. What's a standard for compressive strength? I've
seen - 3300-4000 advertised. Any suggestions greatly appreciated!
Mine is 4 inches, no fiber or mesh or anything. It holds a car just fine,
but it will crack if you put anything heavy on it, like a big U-Haul truck,
etc. My neighbors is 6", fairly new, and it's cracked so go figure? If I was
to do it all over again, I would have done it 6", but by the time I realized
it was only 4" deep it was too late. The valley I live in is old river
bottom and the soil is mud, there is no firm foundation to pour a slab on. I
don't think there is much you can do around here to stop concrete slabs and
sidewalks and driveways from settling and cracking. IANAE.....
What kind of wire mesh, and is the mesh in the middle of the concrete? What
good does the mesh to? I can't see how the mesh would stop it from settling
and cracking. They use 3000 pound concrete here, fwiw.
What exactly does the psi rating mean? Does it mean a square inch of the
concrete can hold 2500 pounds without collapsing or breaking, etc.? Assuming
the foundation underneath it does not give way?
i did this: simply telephone the local concrete mix supplier, the guys
with the big concrete trucks, and ask.
note the mix is varied for the climate, job, soil, base, and will
behave differently based on temp and humidity.
also ask them which driveway contractor pays his bills on time.
you might drop by the supplier office with a box of candy, donuts, and
a pizza, and find out even more.
Overkill for the time when someone drops by in their big motorhome. Or that
relative with the huge ass driving the Toyota comes to see you and REALLY
tests the load limits. It ain't a lot to add some thickness now and not
deal with cracking and shifting down the line. I'd go six inches with wire
and/or rebar, and know that you can drive anything on there.
But that's me. No sense doing it twice or having it look crappy any time
Go with 4" and fiber and spend a few extra bucks for the 4000 mix. The 4000
mix will make the top last longer and make it easier for the finishers to
finish also. That should be more than enough. Tell the contractor that when
they pour the driveway that you don't want more than a 5-51/2" slump. Slump
is more or less how much water is in the concrete or how wet the concrete
is. You could even tell the concrete truck driver when he arrives that if
the mix is more than a 5 1/2" slump that you are going to send it back .If
you have really bad soil (clay) you could put 1/2" rebar around the
perimeter. Wire mesh works very well when it is not sitting in the ground
and if you decide to go with wire instead of fiber ,which you could ,make
sure when the contractor pours the concrete that the wire is not laying on
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