The advise from a forum you would get could vary depending on soil type from different parts of the country. It would be better to go to your nearest city and get specifications from their building permit department. As far as the grade of cement the #3000 cement is rated for 3000 lbs per sq. in. The #4000 cement is rated for 4000 lbs per sq. in. The chairs under the rebar are a good idea however good concrete people can manually pull the rebar up into the cement as they go. At 50'x 80' unless you use a pumping truck or a cement truck has access to both sides the cement truck will have to drive in on the rebar to make the pour. If you set up chairs in advance they will get crushed into the ground. Where I live in Texas the soil is sand. I poured the floor in my shop 3" thick in the center with remesh and 6" thich around the edges. I regularly drive vehicles in on the floor as well as a fork lift and there is no cracks. I know it wouldn't have worked in Dallas where the soil in gumbo.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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