Wood floor in the shop?! I'd be worried about buring the place down running the welder, torch, grinder... gas, diesel, solvent, etc soaked in there too... WOOOO!
I'm finishing up a hickory T&G floor in my woodshop. I was happy I got that for about $1 a square foot. My first inclination for pine in a shop - woodworking or otherwise - is that it is pretty soft and easy to dent or mar.
If its southern yellow pine it's actually harder than many "hardwoods". The Hardwood designation actually identifies deciduos (sp?) trees from evergreen. Thats a good price, I paid that 6 yrs ago for 6"x 16' SYP t&g for my house. Its pretty hard stuff.
You may want to check the slab for moisture. You may end up with a bigger mess with mold and or warping. Waterproofing may be needed before you lay down the wood.
Another thing to consider is leaving at least a 1 inch gap or space around your whole perimeter. You may find your floor buckling horribly if you don't.
If its southern yellow pine it's actually harder than many "hardwoods". The Hardwood designation actually identifies deciduos (sp?) trees from evergreen.
Yep, "hardwood" basically means deciduous. But pine is still relatively soft in comparison. Take a look at the Janka scale here.
You'll note that yellow pine is down towards the bottom. Oak is about twice as hard. I went with hickory in my woodshop as it is even harder. I do have yellow pine in the house and it is fairly easy to to dent and gouge.