This is part of the normal curing process and more prominent in the cooler months when curing is a slower process. It will cure, and typically in no more than 5-10 days it will be the normal color of concrete. The discoloration is just part of the curing process with the additives in concrete like “Slag” (a byproduct of metal production) and “Fly Ash” (a byproduct of coal production). These byproducts take the place of a portion of the cement to create a blend.
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