How does a snowblower perform on exposed aggregate concrete?
Most snow blowers have adjustable skid shoes that look something like this:


(source: jackssmallengines.com)  

On smooth hard surfaces, you can typically adjust these to the minimum height so the snow blower "scrapes" the surface.  If you have a rough surface then you can adjust these so the blade rides a bit higher and does not catch any of the rough surface.