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RE: Wire reinforcement in slabs on ground

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Thanks for the reply Harold.  I think all replies have been favorable to
the 100 mm slab with reinforcement rather than the 125 mm unreinforced
slab.  Unanimous ;-)  I will mention this in my next discussion with the
client.  It gives me a few extra points. 

Kevin 
 


-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com] 
Sent: 23-Feb-06 00:49
To: seaint(--nospam--at)seaint.org
Subject: RE: Wire reinforcement in slabs on ground


The only thing that you should rely on with any type of slab on grade 
reinforcement is for crack control due to shrinkage.  If crack control
is 
critical, I would be inclined to use rebar.

Regards,
Harold Sprague





>From: Kevin Below <kevinbelow(--nospam--at)videotron.ca>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: seaint(--nospam--at)seaint.org
>Subject: Wire reinforcement in salbs on ground
>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 fibres. 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.
>Conventional wisdom 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 cracking.
>
>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 resisting 
>cracking.
>
>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 old.
>
>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" without ?
>
>
>
>Kevin
>
>
>--
>No virus found in this outgoing message.
>Checked by AVG Free Edition.
>Version: 7.1.375 / Virus Database: 268.0.0/266 - Release Date: 
>2006-02-21
>

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No virus found in this incoming message.
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2006-02-21
 

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No virus found in this outgoing message.
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Version: 7.1.375 / Virus Database: 268.0.0/268 - Release Date:
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