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Re: Fibers in Concrete

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For additional info see Structural Engineer Article March 2000
pp 38-40.




On Thu, 1 Aug 2002 11:28:51 -0500 "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
writes:
> Jim,
> 
> I have weighed in on this on the list many times in the past.  
> Forgive me if
> I take the lazy way out and ask you to do a search on the list.  
> 
> Summary: Use WWF and avoid the litigation and claims.  By the way 
> the PC
> designation is WWR.
> 
> Regards,
> Harold O. Sprague
> 
> > -----Original Message-----
> > From:	Jim Kestner [SMTP:jkestner(--nospam--at)somervilleinc.com]
> > Sent:	Thursday, August 01, 2002 10:13 AM
> > To:	'SEAINT'
> > Subject:	Fibers in Concrete
> > 
> > I would like to get some different opinions on using Polypropelene 
> vs.
> > Nylon
> > fibers in concrete slabs-on-grade.
> > 
> > Some facts:
> > 
> > Fibermesh typically recommends 1.5 #/yd and Nycon recommends 1 
> #/yd. I
> > have
> > heard of some engineers using as much as 3 #/yd since they say 1.5 
> #/yd is
> > not enough to control plastic shrinkage cracking. (I know it is 
> not a
> > replacement for reinforcement.)
> > Nycon fibers are more expensive $2.90 vs. $2.30 per pound.
> > Fibermesh leaves a "fuzzy" look. Nycon does not. If a floor cannot 
> have
> > exposed fibers, like say changing room for swimmers with a bare 
> concrete
> > floor where people will be walking on the surface with bare feet, 
> then the
> > exposed fuzzes have to be burned off. This added cost may justify 
> the
> > Nylon
> > fibers.
> > Nylon fibers assorbs a small amount of water (3/4 oz per cubic 
> yard).
> > Polyproplene is inert, therefore, no assorbtion. I assume no 
> adjustment
> > needs to be made in the concrete mix with fibers.
> > 
> > Some questions:
> > 
> > It does not appear that Fibermesh and Nycon are equivalent. 
> Fibermesh will
> > always win because of price. How can you bid both? Do you spec one 
> and use
> > an alternate for the other? Do you write one product out?
> > What type of projects are you using Fibermesh vs. Nycon vs. WWF?
> > What do you prefer and why?
> > 
> > Jim K.
> > 
> 
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