Had crushed concrete on the top in the shop parking lot. Dustiest stuff you ever messed with. Heavy trucks coming in every day kinda grinds it into dust. Keep it wet or wet salt it to keep the dust down.
It was an awful lot of work to keep the dust down, so scraped it all off, pulled up the road gravel from underneath, then put the CC down and gravel on top. That worked well and was really firm to drive my little fork truck on.
I did a sand base on my driveway to build it up, then put down a road gravel/ground asphalt mix for starters. Next, I will put down crushed concrete, then top it with road gravel.
The crushed concrete really adds quite a bit of support, but don't think you want loads directly in contact with it that would grind it up into dust.
Just rubbing it together makes dust, but a good base for another topping.
My opinion based on messing with this.
