Definitely. I would still want to put them through the jointer after I had cleaned them up.
Scraping or whatever and maybe a do with some paraffin or acetone or whatever to get to a standard that doesnt fuck the blade.
That's the type of machine. It's normally used to ensure thickness and squareness of edges for joining thin boards to make larger boards. Not sure how well it will stand up to the bitumen but you could use it to ensure all the pieces are the same thickness.
Something like this?
http://www.screwfix.com/p/erbauer-erb052bte-204mm-planer-thicknesser-230v/81126
I'm guessing to get the base perfectly flat?