Trouble with recycled is, around here no one has a wash plant, some of the screened, you might as well put the soil back, granted it better in the summer/dry weather.
I did a horse arena the other year, customer supplied the materials, 40mm crushed glass, it wasn't too bad, I was thinking it would crumble and shatter, but it seemed OK. Never come across it that big, only smaller sizes to be used in tarmac and sand type grades. Unfortunately they didn't have enough to do the whole job, so only did the drains in it, the rest was do in normal recycled (a bit under sized imo).
The glass looked like it had come from thick panes, maybe 30mm thick, you would of thought it would of got recycled back into glass?