Cement Block Mix Crushed Stone

Crushed concrete will work great, but similar to the last post, you should scrape it down first, get the loos stuff off, cuz when the spring comes, traffic will just push the concrete down into it, now you have thicker mud, so scrape, put down as much as you can, roll it, of course roll when you reach 6 then add more, then roll, etc, im sure if you are patient, and put the word out, you could.