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FWIW, we spec fibers all of the time, and have had a lot of good experiences with them. We had one of the fiber manufacturers do a presentation and they have programs and formulas for placing them in flexural SOG like warehouses with racks. The big thing to remember is DOSEAGE and slab thickness. In those types of applications you may need 35+ lb/cy of STEEL fibers, not the usual 2-3lb/cy of polypropolene like in SOG for spider crack control. Will they keep a large crack from opening up like conventional reinforcement? Maybe not.....
 
BUT, before you write fibers off completely, I suggest taking another look at what the manufacturers are reccomending now, and maybe have them come do a lunch presentation at your office so you can ask them questions and make an informed decision. And I am in no way affiliated with any fiber company...
 
Andrew Kester, PE
Longwood, FL