Ideas on this concrete

looked at a job, 3 month old concrete, but I have never seen this before and am curious as to what others think it is. Asked the contractor about it and they know nothing about it. Looked at the building next to it and am seeing the same thing just not as bad. Brushed concrete at a fuel station if that helps.
 

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You shouldn't use any pressure on new concrete for up to a year.

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Almost looks like where the delivered a dumpster and it scrapped the surface.


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