Rubber "sand" What to do with it? Answered
They market the stuff for installing around playground equipment. It's shredded tires. I got a load free.
I plan to use some for backfill in a spot which was very rough to dig out. But I'll have leftovers.
Can I vulcanize it into solid rubber? How? Mix with concrete to make it lightweight? Or will thermal changes cause rubber to expand /contract too much? What else could be done w/ it?