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RE: Fibermesh in concrete over metal pan deck.

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What you have observed is the rule, not the exception with polypropylene
fibers.  You will get fewer cracks, but they will be wider.  And they will
not be able to retain aggregate interlock and will curl differentially.
Then you will have a tripping hazard.  If you inject the cracks, count on
about $5 per lineal foot.  It makes the WWR look like a bargain.

I have had to clean up this mess on several projects where polypropylene
fibers were used.  I have responded to this at length in the past.  Do a
search on this list.

Harold O. Sprague

> -----Original Message-----
> From:	Timothy P. Spengler [SMTP:timothyps(--nospam--at)]
> Sent:	Wednesday, August 28, 2002 5:53 PM
> To:	seaint(--nospam--at)
> Subject:	Fibermesh in concrete over metal pan deck.
> In accordance with an ICBO report, I spec'd fibermesh as an acceptable
> substitute for the welded wire fabric that is typical used in the concrete
> that is poured over metal pan deck.  Standard composite deck, floor
> construction.  
> Well the concrete floor has cracked quite a bit.  Say 1/16" cracks
> occuring in a real rough 15' to 20' grid pattern.  First time I've seen
> this happen in a concrete floor and I suspect the fibermesh is to blame.
> Anyone out there have an identical experience?
> Tim Spengler PE,SE

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