slab without reo

Hi
Just wondering if any advice can be given regarding a house slab without the normal mesh and bars. I am almost convinced to do it with a fibre mix but have no experienced knowledge of this. I don't need to worry too much about the founding material as I am going directly over a sandstone shelf (not floater). My local concrete supplier only uses polymer fibre but I wonder if this is as strong as using the metal fibre. Also wondering if the concrete finisher would have any extra trouble dealing with either fibre with his helicopter???


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