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Any help is appreciated.
As syntetic fibers the best is polypropilen fibers, because nylon and PE fiber consumed water from the mixture and difficult to make stable the concrete. Thanks for the help. I am David Niday. You may be interested in the fact that ACI Committee 440 issued a draft on Provisional Design Recommendations for Concrete Reinforced with FRP Bars. A Draft 3 was issued in January 1999.