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 - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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