Concrete pad 5 feet by 12 feet 4 inches thick...will support a piece of equipment that weighs about 700 pounds...can this pad be poured on top of an asphalt parking lot?
This is called "whitetopping". If the asphalt is in good condition, should work well. Here are links to a couple of typical articles on the subject
ftp://imgs.ebuild.com/woc/C920664.pdf