George with the powder dry dirt your going to have under the slab I think your going to have cracks. The sad fact is it is going to move regardless of what you do to the pour. That being said I like fiber glass in floors IF your not wanting a really smooth finish. The fiber glass will stick up after it is finished and it will have wear off to be really smooth. The fiberglass will not stop deep cracks either. What it is very good for is shallow surface flaking and such. You also do not have to use as much rebar.
We just poured 3500 mix with 1/2 rebar on 3 foot centers, with fiber glass 5 1/2 inches deep, at my Grand daughter's. The rebar will keep the deep cracks from shifting levels and the fiberglass will keep the surface for flaking off. We just floated it off. We wanted a rough finish for livestock to walk on but not a broom finish.
The fiber glass is great for sidewalks. as the little rougher finish is not near as slick to walk on wet.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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