Would 'clay fill' be suitable for a cheap 'baseball infield mix' landscaping material?

I'm actually looking to use it for a patio area...as a semi-soft surface that will retain some shape when compacted down (rather than landscaping the area with grass, cement, gravel, or mulch). I've gone to a few city ballparks and feel it would be the perfect material. It's a clay/sand mix which would cost me a few hundred bucks. 

But I've found a guy who has a load of clean 'clay fill' which I could get for free. Just wonder if this might work...or if there is something super-special with infield mix. I could mix in some sand if necessary. Doesn't have to be perfect.