Can you out a maintenenace free deck on top of cement? The cement is cracked and gravel is exposed in some areas?

Your question is kind of vague. Do you mean "can I install a maintenance free deck directly on top of a cracked concrete slab"?

You'd have to nail sleepers down to attach the decking boards to it. But yea
Attaching the post to where they would be stable would be another problem

Your question is kind of vague. Do you mean "can I install a maintenance free deck directly on top of a cracked concrete slab"?

Yes. We don't want to have to remove the entire patio due to the cost. So we thought we could place a deck on top of it and only remove the cement areas where the post would need to be placed. We just don't know if placing a deck on top of the cement is even an option.