Well, I started demolishing the pad this morning. Unfortunately I must have pulled something and my arm is now quite sore. But, it did start coming apart pretty nicely just using the hammer end of my splitting maul. Here are some pics.
I started with smashing the poured center. Like the suggestion, I tapped around to hear for a hollow sound. The brick was solid, but the poured center sounded more hollow, so I started there.
Pretty quickly, the brick on the sides started to push away. A little more tapping and I was able to pull it away with my hands.
