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RE: Fibers in Composite Slab

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I have seen synthetic fibers used in one elevated slab on metal composite deck.  It resulted in one of the most expensive repairs on a new project that I have ever seen.  There were big cracks everywhere.  Crack epoxy injection at $6/ft and the patching and grinding of the concrete cost 100's of times more than the percieved savings.  And the fiber vendor ran for cover. 

Harold Sprague

Subject: Fibers in Composite Slab
Date: Thu, 10 Jul 2008 18:19:36 -0500
From: jadair(--nospam--at)
To: seaint(--nospam--at)

Does anybody out there have any experience with using fiber reinforcement in an elevated composite slab?  We’ve got a project that has come in way over budget, and the contractor has suggested that we could save some money by taking out the welded wire fabric and just using fibers.  Given the situation, we’d like to entertain the thought, but none of us here have done it, so we don’t have any comfort level with it and aren’t particularly thrilled to have this $100 million project as the test case.


If you’ve tried this, did you use synthetic fibers, steel fibers, or a mixture?  How were the results?  Were there finishing problems?  Cracking?  If we go with fiber, we’re planning on keeping rebar over the girders to control cracking in the negative moment region – would you agree that this is good practice?  Any other considerations?




-- Joel


Joel Adair   PE
Structural Engineer

P 214.473.2400 Dallas
D 214.473.2528
F 214.473.2529


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