specify fibers. You can specify that fibers be provided according to the
manufacture's specifications but that usually amounts to only about 3/4
lb per yard. That is too low for most purposes. I have been told at an
ACI seminar that a minimum of 1.5 lbs per yard should be specified for
nylon fibers in the type of use you describe. There is a lot of debate
as to whether fibers are effective but in Florida they are permitted by
code as an alternate for steel reinforcement and control joints in
residential construction.
Your #4 bars at 24"oc each way are vastly superior.
Christopher Banbury, PE
President
Ark Engineering, Inc.
PO Box 10129, Brooksville, FL 34603
22 North Broad ST, Brooksville, FL 34601
Phone: (352) 754-2424
Fax: (352) 754-2412
www.arkengineering.net
-----Original Message-----
From: Jason Christensen [mailto:jason@wcaeng.com]
Sent: Thursday, November 08, 2007 1:01 PM
To: seaint@seaint.org
Subject: Fiber Reinforced slab
I have a client wishing to put a fiber reinforced slab in a small office
building. The slab on grade is 4" thick. Reinforcing will be for
temperature/crack control only. I have never called this out, we
typicall call out #4 at 24"oc each way w/ f'c=3000psi. I am not sure
how to spec this on my drawings. Is there a typical poundage per mix?
I guess the question is which is the best way to spec it on the my
plans?
Jason
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