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Wire reinforcement in salbs on ground
- To: seaint(--nospam--at)seaint.org
- Subject: Wire reinforcement in salbs on ground
- From: Kevin Below <kevinbelow(--nospam--at)videotron.ca>
- Date: Wed, 22 Feb 2006 23:00:43 -0500
I was having a
discussion with a client about using wire fabric reinforcement in a slab on
grade. His "other" engineers are becoming very gung-ho about using steel
But the present
project is an office building, with mostly light loads on the ground floor
(except for the library), not a highly loaded distribution or warehouse building
with racking and fork lifts.
I recommended a 100
mm slab with wire fabric and control joints at 4 metres.
It's about the same
price as 125 mm without wire fabric and control joints at 4 metres. The
"other" engineers prefer the latter.
I prefer the former,
since it's a system that has been used in this area for at least 28 years, no,
that's a joke.
here is that wire mesh is no good since it's always at the bottom, never in the
slab. But I remember reading an article once in Concrete Construction
arguing that the bottom is the best place for the reinforcement, since that is
where the sub-grade friction is, and this is what causes the
We all know that the
mesh ends up on the bottom, since we have seen it there when we demolish old
slabs. But if the mesh is pulled up into the slab occasionally, like say 1
metre c/c, I would say that there will be some sort of composite action between
the slab and the mesh, and that the mesh will be at least partially effective in
I have used a 100 mm
slab without mesh, for a lightly-loaded slab with no floor covering, where the
occasional crack is not a huge problem. Using a Soff-cut saw for the
joints worked wonderfully to control cracking, at least to date - 1 year
But I am reluctant to
forego the mesh on the present job, because the floor covering is linoleum,
which will reflect cracks.
Any thoughts on this - what do you prefer - a 4" slab with mesh, or a 5"
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