Repairing pebblecrete

Hi. We have a 40 year old house with pebblecrete over the balcony and front steps. Its starting to come off in small patches - there are currently about three patches each about 10cm x 10cm. I have plenty of the original pebbles, but no idea about how to repair these.

One thing I have tried is just plastering concrete on and attempting to stick the pebbles to that. It definitely doesnt work. Most of the pebbles drop off and the finished result doesnt look like the original.

Anyone know a reliable way to do small patch repairs ?

cheers
Arron


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