Crushed stone size limitation for non-expansive frostfree fill

[StructLin]

Hi, Guys, Need help here.

I remember there was a thread before, which discusses about the crushed stone size for use as non-expansive frostfree fill. But I can not find this thread now. Can anybody direct me to that thread or tell me what is the max./min. crushed stone size for non-expansive frostfree fill?

Thank you very much.