If you need to break up asphalt, the best tool to use is a sledgehammer. You can also use a jackhammer or an excavator. First, mark the area where you want to make your cuts. Then, using the sledgehammer, tap along the line of your cut until you have created a groove that is about 1-2 inches deep. If necessary, widen the groove with the excavator. Finally, use the jackhammer to break up the asphalt into smaller pieces that can be removed by hand or with a shovel.