Cold Joints in shotcrete

My PB tells me there is no such thing as cold joints with Gunite. I did some research and found that to be true if first pour was less than 7 days old, proper cleaning, etc. Well my shell is almost 1 month old. There was some miscommunication between PB and gunite sub. They poured my tanning shelf 6 Inch too short In length. I was ok with it, but sub proceeded to chip out the edge to extend it (using shotcrete). initially he was going to just shoot extra gunite. I told him that he needed...

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