I'm more of a fan of traditional design, compared to using a reinforcing admixture. I would go with with a bit stronger then needed compressive strength design mix, 4000 psi would seem to be a good fit, and with more than sufficient deformed metal bar reinforcing, all used in a suitable slab design for the conditions. Nothing smaller than a #4 bar, maybe #5, and a grid dimension each way that reinforces adequately.
Your soil concerns me, what kind of bearing capacity is it? How well drained is it ? There'd be no way I would construct a slab unless it was on a subgrade of gravel that with optimum moisture will compact to the required compaction say 95% or better. That would have to be on top of undisturbed soil that will bear the intended loads, maybe with fabric to further strengthen. Well drained is a must.
Concrete material quality assurance is a must, and the single most important aspect that gets tampered with is the water to cementitious material ratio to change the slump to make it more workable. You can't do that and expect performance. Select the best design slump for what the job needs, maybe you need more people to place and finish, better than watering it down. Want to know what PSI it actually is, take 4 test cylinders, fill in 3rds by rodding each lift 25X with an iron rod of a certain diameter, testing outfit can then do the breaks for you at 7, 14, 21 or all at 28n days. Earlier breaks tell you if it will make it's design strength by how much it is increasing. Sounds ridiculous for a barn slab, but if you want to know, easy enough to prove.
This material requires some knowledge of lots of little things, but easy enough to get good result based on same.
Placing, you are headed for cold weather, that "placing" needs to start at 6AM on the best weather day you can get, as the day gets warmer, the hydration process is taking place without freezing unless it's really very cold temperatures. You are finishing at a good time in the day with lots of natural light. Getting started late is a mistake, been there done that, do it very early in the day. Slow cure, cooler weather is better, bridge deck construction they always burlap and sprinkle water for several days, slows the hydration process, and they typically do this even when not hot out.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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