Obviously fiber is much easier than mesh. Mesh is a pain, because you have to keep lifting it up as you pour, otherwise it will end up at the bottom of the slab where it does no good. But I believe mesh is a much better choice than fiber for a shop floor, and rebar is better yet. I used mesh in my shop, and I have zero cracks after fifteen years. For the slab in front of our garage, the contractor convinced me to go with fiber and it quickly cracked in a couple of spots.
I don't think there's any way that fiber can add the tensile strength of steel. If it did, they'd use it in Michigan roads instead of rebar, which rusts at the expansion joints, requiring frequent replacement. On the other hand, I've never had any problems with fibers protruding from our slab; I frequently walk barefoot on it with no problems.
If you go with mesh, figure out in advance where you want your control joints and cut every other wire that will cross the joint. That will encourage cracking at the joint.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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