I just received a sample package of BASF MasterFiber products. Has anyone ever used them? There are several lengths of poly looking fibers of different lengths as well as metal fibers of varying lengths and diameters, and up to about 2 inches in length. They are supposed to be added to concrete before the pour, and are to replace or reduce the amount of steel needed for reinforcement. Another claim is they will reduce cracking. Has anyone ever used or read about this product? ALL replies are greatly appreciated. I am not a concrete contractor, but if they work as advertised I would consider using them in a monolithic slab-on-grade pour.

Why would you use something you don't know anything about in place of what people already use? What does the engineer say about it as respects your project?

I just have the concrete batch plant mix in the poly fibers for the flat work I have had done. I think it cost me ~$6/cu yd for the fiber to be added to the concrete. By the time the truck gets here, it is thoroughly mixed. I wouldn't rely on it to totally replace the steel in your slab, unless it is a very small slab on well compacted base.

Your reply seems rather closed minded ICFHybrid, you are making some inaccurate assumptions. I do not see the harm in researching new products. Do you still use a hammer instead of a pneumatic nailer? I was told the metal fibers could reduce the use of rebar, and reduce stress cracks. The information comes from a concrete batch plant operator. We were discussing how best to cut the slab and how best to lay out the radiant heat lines to keep from cutting a PEX line.
Arkie6, have you used the metal strands, or do you use the synthetic fibers? Are they worth the cost? I am not planning to eliminate the rebar. FWIW the slab will be 56 X 33.

I have not used the metal strands. I poured my front porch (7.5'x38') and garage slab (24'x32') about 10 months ago using the polypropylene fibers, welded wire, and 1/2" rebar around the perimeter. I saw cut control joints in the porch slab approximately every 7.5' and cut the garage slab into 4 equal parts. I can't even find a crack in the control joints on my front porch. I have one small crack in the garage slab approximately 1' long in a corner where I had a 2" pipe penetrating the slab. Other than that, no cracks.