huangyhg

fiber reinforced concrete replace wire mesh?
hello everyone
well i want to use polypropylene (or nylon) fiber as replacement of wiremesh in an elevated slab of composite metal decks. i just want to know is there any code or at least suggestions that suggest this substitution? (as manufacturer of the fiber recommend this)
thanks
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at the top of the page, you can search for what you want in eng-tips. type in "fibermesh" and proceed from there. there are numerous posts regarding this subject.
fibermesh is for crack control only. if wire mesh is needed as bending reinforcement (for strength), the fiber mesh is not a substitute.
see
fibers generally in low volumes are for crack control (dry shrinkage and temperature), however, large volumes of fibers - 0.5% can be used for strength.
regards,
qshake
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qshake, are there any building code evaluation reports that approve fibers for replacing structural rebar? the ones i have seen explicitly state that this is not allowed.
i'm still confused as to the benefits/uses of fibermesh, which is why i don't use it. i was under the impression that the major benefit of fibermesh was to control plastic shrinkage cracking, and that it had little effect on temperature shrinkage or strength. is there an aci publication that recommends design minimums for fiber reinforcing, to be used in lieu of chapters 7 and 10 of aci 318?
i just thought you use fibermesh to increase your fc. it has nothing to do with reinforcement.
synthetic fiber reinforcing is not used to increase the compressive strenght of concrete.
aci 302.1r-96 "guide for concrete floor and slab construction", section 5.8 "reinforcement", section 5.8.3 "synthetic fibers":
"synthetic fibers are used in floors to minimize plastic shrinkage cracking of concrete. these fibers should not be used to replace temperature and shrinkage reinforcement because they have little impact on the behavior of concrete after it hardens."
please see my response at the bottom of this thread:

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