Well put question Tom.... and I know your basic problem well... I never seem
to have the budget to go with my tastes....
I'd rather see you add to your slab then pour over it. There just aren't
any good ways to bond your first pour to the second pour and keep the rates
of shrinkage of the two differnt slabs constant.... I thought about how I'd
do it and I think your solution of adding to your slab really does make the
best sense so long as it's well planned in advance.... Well planned means
that you need to figure out how to connect the two before you pour the
first.... What that means is that your going to have to devise a rebar setup
in the first slab that is out of your way and underground around the first
slab.... this rebar sticks out say...8-10" or is a loop of rebar that sticks
back into the slab.... then when the second slab is poured it's connected
with the first with this and some type of metal expansion joint ( avalible
here in the states from your local concrete company )
In my shop I've to a single expansion joint dead square in the middle of it.
There has never any real issue with rolling small metal wheels over it. My
issue has always been the dirt falling into the crack as I sweep across
it... but this isn't really a significant problem.
Keith ( http://downtown.ala.net/~kturk )
----- Original Message -----
From: "Tom Bott" <tbott1@bellsouth.net>
To: "Shop-Talk" <shop-talk@autox.team.net>
Sent: Saturday, February 16, 2002 12:05 PM
Subject: Concrete Advice
>
> Good Day Folks,
>
> I need some advice on concrete slabs. My long range plans is to build a
16x24
> garage/workshop in my back yard. It may be a couple years or more before
I
> can afford to build it as I am planning it with some whistles and bows.
In
> the mean time I am considering pouring a 10x16 4" basic slab (no footings
etc)
> which I can use to work on a car project. My questions are this: when I
am
> ready for my building, can I pour over the existing slab? If so, would
the
> new building floor have to be another 4" higher than the slab or could I
just
> pour around it? By pouring around it, would the joints create a big
nuisance
> when rolling equipment or creeper over it?
>
> Thanks for your input,
>
> Tom
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