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Re: Fibrous concrete

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Harold is correct.  Fiber reinforcing will not resist cracking due to
external stresses.  But neither will wire mesh, unless you use a ratio
greater than rho min.  Typically, the amount of wire mesh is approximately
.0018 the area of concrete which is only for temperature and shrinkage
(internal stresses).  I've also seen plans that call out a lot less steel
than 0.0018.

If one is worried about external stresses, I would recommend deformed
reinforcing bars with a minimum area of steel equal to 0.003 times the area
of concrete.

Don't get me wrong.  I'm not an advocate for fiber reinforcing.  I just
believe that we should be comparing apples to apples.  I do not believe that
fiber reinforcing will ever take the place of primary reinforcing steel.

Mike Brown

-----Original Message-----
From: Harold Sprague <hsprague(--nospam--at)aspen.klaalov.com>
To: 'seaoc(--nospam--at)seaoc.org' <seaoc(--nospam--at)seaoc.org>
Date: Wednesday, June 10, 1998 3:16 PM
Subject: RE: Fibrous concrete


This is right out of the Fibermesh web site:

Don't specify Fibermesh for:
The control of cracking as a result of external stresses.

The Fibermesh representatives define "external stresses" as flexural
stresses due to applied loads or settlement when referring to slabs on
grade.

Harold Sprague
KL&A

-----Original Message-----
From: ayvel(--nospam--at)ursgreiner.com [SMTP:ayvel(--nospam--at)ursgreiner.com]
Sent: Wednesday, June 10, 1998 11:15 AM
To: seaoc(--nospam--at)seaoc.org
Subject: Re: Fibrous concrete

Has anyone specified fibrous concrete for slabs on grade as an contractors
option in lieu of std. wire mesh?