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Concrete slab for parking a car Les Desser 11-09-2006
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Posted by Les Desser on November 9, 2006, 7:05 am
Re-doing the driveway for my Mitsubishi Shogun (weighs about 1.5 tons)

I was planning to lay 8" concrete slab over compacted soil with wire
mesh located about 2" from the top.

Someone now says I need 12"!

I thought I was going over the top with 8". The old one was about 4"
with the odd bit of wire chucked in and it was OK - I had to take it up
to lay water pipes.

Who is right?
--
Les Desser
(The Reply-to address IS valid)

Posted by DanG on November 9, 2006, 7:26 am
4" would be adequate. 5" would be excessive. Make sure that the
area is well compacted, especially if it had been dug up for
reworking the water line.

A good practice would be to dig the perimeter down 8-12" with a
single bar of steel. Many slabs break where there is a
substantial load placed on corners and edges.
___________________________
Keep the whole world singing. . . .
DanG


> Re-doing the driveway for my Mitsubishi Shogun (weighs about 1.5
> tons)
>
> I was planning to lay 8" concrete slab over compacted soil with
> wire mesh located about 2" from the top.
>
> Someone now says I need 12"!
>
> I thought I was going over the top with 8". The old one was
> about 4" with the odd bit of wire chucked in and it was OK - I
> had to take it up to lay water pipes.
>
> Who is right?
> --
> Les Desser
> (The Reply-to address IS valid)



Posted by RicodJour on November 9, 2006, 8:04 am

Les Desser wrote:
> Re-doing the driveway for my Mitsubishi Shogun (weighs about 1.5 tons)
>
> I was planning to lay 8" concrete slab over compacted soil with wire
> mesh located about 2" from the top.
>
> Someone now says I need 12"!
>
> I thought I was going over the top with 8". The old one was about 4"
> with the odd bit of wire chucked in and it was OK - I had to take it up
> to lay water pipes.
>
> Who is right?

4" for sidewalks, 6" for driveways. 8", and the wire mesh, is
unnecessary if you're paying attention to compaction and drainage.

R


Posted by Bob Morrison on November 9, 2006, 10:46 am
In a previous post RicodJour wrote...
> 4" for sidewalks, 6" for driveways. 8", and the wire mesh, is
> unnecessary if you're paying attention to compaction and drainage.
>

I second this recommendation. As I have said before:

Unreinforced concrete with proper crack control on a properly compacted
gravel base. No WWF, no fibermesh, plenty of crack control joints (every
150 sq.ft.).

To reduce cracking use as dry a mix as possible in order to reduce
shrinkage. Use a mid- or high range water reducer in order to be able to
place the concrete. Some finishers like to use 5-1/2 or 6 sacks of
portland cement per CY in order to get a better finish. It takes a little
less than 3 gallons of water per sack of cement to make the chemical
reaction happen. The rest of the water is for handling and comes out as
"bleed" water on the surface or through evaporation through the concrete
surface. The concrete changes volume (shrinks) when this happens and
cracks form.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by DT on November 9, 2006, 8:54 am
says...
>
>Re-doing the driveway for my Mitsubishi Shogun (weighs about 1.5 tons)
>
>I was planning to lay 8" concrete slab over compacted soil with wire
>mesh located about 2" from the top.
>
>Someone now says I need 12"!
>
>I thought I was going over the top with 8". The old one was about 4"
>with the odd bit of wire chucked in and it was OK - I had to take it up
>to lay water pipes.
>
>Who is right?
>--
>Les Desser

In our area (northern Ohio), the vast majority of driveways are nominal 4". 6"
is extra strong, specified by most cities for aprons. Your vehicle is not
particulary heavy. Place the mesh in the lower third of the pour, where it will
contribute to the bending strength. If you are doing it yourself, just lay the
mesh down and when you pour the concrete , pick up the mesh into the pour as
you go using a hook or rake. The aggregate will hold it up.

--
Dennis


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