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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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