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That's a huge project!
Re: the green concrete - is someone else also doing repairs on this thing?
I'm not feeling good about partial repairs because they so often seem to appear different from the rest - but this one is already pretty beat up.
Hmmm....
If the whole drive is sitting on a concrete slab (which seems hard to believe looking at the shape of it in the pic), you might cut out the sunken sections, fill with compacted stone, then lay a tight geogrid over it, attaching it to all sides where it meets the slab (pulling back more cobbles than the repair area, then relaying over the grid, with mortar if needed to return to previous condition).
Just repairing as you did for the sched 40, but prepping to a greater depth to prevent settling like around that pipe.
I bet this drive is part of a grand old house. But this looks like a problem project to me. How do you define what needs repair and what doesn't? Will they be happy with it when you've repaired the "really terrible" sections but left the "aweful", "bad" and "unsightly" sections alone?
I know you know what you're doing - this just looks like one of those things where I wouldn't be happy with the end result unless it was a total tear-out and re-do. I think trying to prep or compact the areas beyond the exact area you'll be repairing will be a big help in the future durability of this repair.
That's my $.02, anyway.
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