I used to run a jackhammer (well, air hammer) on a paving crew sometimes...talk about suck. I think it would be more work than swinging a maul. They are very heavy to lug around. Plus you either need to drag aorund a cord or an air hose (and have a huge compressor in that case). Its work...a lot of work to lug them around and take the beating that they give you. Worst job i ever did on a rain out day was to get into the bed of a dump truck in the Ohio heat and humidity and hammer out hardened asphalt. Probably lost 30 lbs in 30 minutes.
Other than that, i think if you get the largest bit you can it would work. Get something like a 3" spade, i would think the duller/more nicked up the better, and something called an asphalt wedge which will be narrower, but more wedge shaped. I just dont think thats the easy route at all...I would much rather noodle...