this was Wednesday and it was freezing,... so long as you cover it up it appearts you are fine... Inspected mine last night and it looks okay... tried pulling a stone off and its well stuck... It got a lot to do with water staying fluid and interacting with the cement.. if it freezes, this does not happen and it reduces the joint strength and can turn it to powder....
you can also use cold weather addatives if you like?...
cover it it and it should be fine is the advice I was given
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