cement floor

building a shop for a guy 30 x 40. he wants full foundation.second floor wants cement.what do you use for a floor joists.11 yards concreat weights 44 thousand lbs. then 3 to 4 tractors and shop equement.

Sounds like you need to consult an engineer. You can do it with wood falsework and then the proper rebar and possibly post tension cables. Strip the falsework out after the slab has cured.
The other route is steel framing and pan-decking.
Either way, I'd be talking to a good licensed engineer

www.msprecast.com/pages/prod_flexicore.html

I-beam framework with steel bar-joist spanning in between, then heavy gauge corrugated sheetmetal on that. An engineer would be invaluable, however, figuring loads and spans, etc.

That has to be designed and calculated, and I may sound harsh, but there is a reason.

A commercial building like you describe with an occupied 2nd floor or I assume based on your description, a building with a reinforced concrete foundation that has a basement under the shop area, needs to be designed as one, foundation supporting walls, columns and beams. Don't forget soil bearing capacity as well. You need a design based on the floor being supported by the foundation walls, beams and columns. You need to determine a rating, say for example 100lbs per square foot, which is typical of an office building, built of similar components, concrete and structural steel.

The owner will be best represented to collaborate with the designer, so as to recognize the loads that will be imposed on that floor, ie; tractors, shop equipment and so on, also include a safety margin and some inclusion to clearly label and warnings placed about such loads so someone does not drive a D8 crawler or some heavy piece of equipment in their thinking its a slab on grade,

I would absolutely make sure the owner has this designed, detailed by a licensed professional engineer, all structural components, stamped and signed with his/her seal and approved by the local building department, before even considering putting a bid or a price on it. A contractor would be extremely foolish and completely liable for negligence if they were to bypass this and arbitrarily construct what they might think is sufficient, it has to be designed, supported by calculations to determine load ratings. Bypass this and there is a strong possibility of catastrophic failure.

For a structural engineer, this is a straight forward job unless there are non typical conditions to deal with.

A typical design would use a concrete foundation, structural steel, and composite metal decking on a steel frame, where concrete is placed you could also look into precast concrete plank and similar precast components that meet the load requirements I suppose, and or using falsework etc. Options can be explored to provide some value engineering for the owner
Metal Decking

Heres your link and another
MS Precast

Old Castle

Spend a few hundred bucks and get a licensed structural engineer to design it.

Better than getting someone killed.