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RE: Fibermesh Topping Slab

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Title: RE: Fibermesh Topping Slab

I do not believe that ACI at this time recognizes fiber reinforcement as an acceptable replacement for conventional primary reinforcement.  My experience has been that if you use nothing but the fibers you end up with great big cracks spaced a good distance apart as opposed to closely spaced hairline cracks.  If the contractor insists on using fibers tell him that's fine, but keep the WWF in and he pays for the extra cost of the fiber.

D. Matthew Stuart, P.E., S.E., P.Eng.
Senior Project Manager
Schoor DePalma Engineers and Consultants
Structural Department
200 State Highway Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1275)
908-309-8657 (Cell)
732 -431-9428 (Fax)

-----Original Message-----
From: Brian K. Smith [mailto:smithegr(--nospam--at)]
Sent: Thursday, October 02, 2003 1:02 PM
To: seaint(--nospam--at)
Subject: Fibermesh Topping Slab

We recently completed the design of a 3 story assisted living center.
Construction is pre-cast hollow core with cmu walls.  We specified a 2"
composite topping slab with welded wire fabric.  One of the contractor's VE
options was substitution of fibermesh for the WWF in the topping slab.  Is
this common????  The shear loads are relatively low due to the depth of the
structure and the spacing of the interior walls, but this just seems like a
bad location to use fibermesh.  Any thoughts or experience???  The structure
is in south Florida, high wind but no seismic.

Brian K. Smith

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