Pouring concrete is like painting a tractor. The results are a direct result of how well the subgrade was prepared. The subgrade needs crushed stone/gravel to lock it together and dissipate moisture, and needs to be compacted with vibratory type compaction equipment in thin lifts to achieve a level and smooth surface to pour the concrete on. Poor compaction and unstable substrate lead to cracks.. I suggest 4000# mix with added stone, 6 mil vapor barrier, and wire mesh with #4 rebar 5' OC both ways because sheets of mesh are 5x10ft. Stay away from rolled mesh. I also like like to see a 1-ft deep haunch at the outer edge with rebar parimeter tied to the the cross grid. In Georges situation I would recommend 3 reliefs cut 10-ft on center the length of the building and one down the center lengthwise. George's substrate is going to move with just dirt and no stone or gravel and non vibratory compaction after the frost sinks in.-----Loren
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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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