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the problem with concreting over the pebbles is that there will be a moisture trap, and dependent on new layer depth, this will blow due to freeze/thaw quicker or slower.
so either remove pebbles and scabble out so there's a good 150mm new slab depth to pour, or consider leaving as is and put a deck on top
rive_gauche
Gndlf
Yep, would like to keep a tiny slope for obvious reasons... Want to completely cover the pebbles too...