If the community you live in allows residents to have gravel driveways, then definitely yes! Some neighbourhoods have restrictions so if you happen to live where it's okay, be a good friend and take the gravel off your friend's hands. read more
It depends a bit on what you mean by gravel. The term used in the trade is crushed stone and there are several types and grades. Crushed stone can make a good driveway but it needs to be done right. read more
Re: Mixing concrete powder into the gravel - driveway Jim, take a look at products like "Polypavement" and some of the other brands (do a google search on soil binders and similar terms). There are numerous brands out there that do work to bind together the soil into something that seems to be a rough equivalent of asphalt, and is something that a do-it-yourselfer can handle. read more