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Can't offer any advise in the "how to" category but people like KMS and other pros are your best guides. Good Luck ;~)
If so, you may want to consider "etching" the concrete before adhering anything to it. Then, as KMS suggests, the stones themselves can be set with a mortar set. When all of your "pebbles" are in place, then you can fill the voids with the polymeric said that DH mentioned. Usually, just before the filler sets, you can brush it with a stiff bristle brush for a finished look.