I’d be gone like yesterday’s burrito.
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If they’re counting on uncured week old (or younger) concrete they’re idiots..
Magnesium phosphate based cement is not the same chemistry as common Portland cement based on calcium silicates. It’s also somewhat more expensive; but, justified in use based on the speed in which it gains initial strength and 75% of ultimate load capability (24 hr). It adheres to virtually any composition material. Has been used in dam repair before.