How can I salvage a crumbling, cracked 24x24" triangle shaped concrete patio without tearing it out?
15" deep, but not solid concrete, was packed full of dirt, rocks, etc as fill. Needs to be budget friendly, maybe DIY perhaps. Was built by my Dad in the 80's when he owned the home.
All I can offer is sympathy but I know when a few of our pro's see this the cavalry will ride to the rescue!!! ;~)
You could consider putting pavers in however. You would still need to demo the cement then ...»
For the edges where it has crumbled, you would be better served if you constructed a new wall a few inches away from the old and then back fill and make the patio a bit bigger over all.
Ideally it should all be torn out and everything should be started over again. It is a lot of work, but done correctly It would last many years.
Hard on cash, remove the patio and install a new wood deck in its place.