One thing that has changed how concrete is reinforced is called "fiber".
It's actually fiberglass strands about 1" long which are added to the dry
mix and work amazing well to control cracking. The only minor downside is
the fact that power troweling lifts the fibers out of the surface so the
slab can get a bit fuzzy, but that wears off quickly after the cure with
foot or vehicle traffic.
I have found that adding fiber to the mix when capping a chimney is a huge
advantage in controlling cracks.
Supposed to be the wood guy,
Rudy
-----Original Message-----
From: The listserv where the buildings do the talking
[mailto:[log in to unmask]] On Behalf Of Larry Simpson
Sent: Tuesday, August 18, 2009 7:36 AM
To: [log in to unmask]
Subject: Re: [BP] Basement floor
I've never seen rebar in a basement floor although wire mesh was sometimes
used in the past. Rebar is no longer used in curbs or sidewalks in Ohio
because, the non coated stuff tends to rust out and cause more damage where
salt water from road de-icer seeps through cracks. Green bar (epoxy coated)
is used extensively in structures but is not considered cost effective for
non structural pours. 5000 psi concrete is adequate for properly prepared
concrete pours on graded ground.
Larry2
Public Works Inspector
Cincinnati, Ohio
---- Lawrence Kestenbaum <[log in to unmask]> wrote:
> Okay, so the contractor showed up this morning, and they have been
> jackhammering the basement floor to open up a 2' wide trench along the
> outside walls. Last I looked, they were more than half done
> trenching.
>
> From the concrete chunks they have been dumping in their truck, the
> concrete floor is about five inches thick. But, to my astonishment,
> it's just concrete, no rebar.
>
> How would a concrete basement floor stay nice and flat for 50+ years
> without any reinforcement? Don't they use rebar even in sidewalks?
>
> Signed, Never Actually Poured Any Concrete Myself,
> Just Helped Install Forms, And That Was More Than Three Decades Ago in
> Arizona
>
> ---
> Lawrence Kestenbaum, [log in to unmask]
> Washtenaw County Clerk & Register of Deeds, http://ewashtenaw.org
> The Political Graveyard, http://politicalgraveyard.com
> P.O. Box 2563, Ann Arbor, MI 48106
>
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