There's two different major types of cracking a concrete slab can have.
1. Flexural cracking due to shifting of the soil below, and/or loading from above. This is handled by proper preparation and compaction of the sub base and adding rebar (although some of the manufactures claim the fiber will handle this too...)
2. Cracking caused by shrinkage and creep. As the concrete cures, it shrinks slightly (shrinkage) and also can settle (creep; mostly in elevated slabs) For this you need surface reinforcement; Either wire mesh or fiberglass will work. The fiberglass should be added in the proper proportions per the manufacture and mixed in.
When I was working on my masters, one of the classes we added fiberglass to the mix to see how it would affect the blast performance of a slab. However, after pouring the first slabs without, and adding the fiber to the truck, the driver thought the mix was "too thick" and took the liberty of adding water to thin it back out again (without consulting us first). This appears to have affected the strength as the test cylinder for the fiber were much lower than the non fiber ones. So if you are going to use fiber make sure you add it properly.
They also make a metal "fiber" admixture that can be used as well.
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