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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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