A contributing factor may be that the concrete isn't allowed to "cure". I've been watching all the new construction going on around me for the last 7 months...concrete is poured, and building on the slad begins no more than 3 days later, weather permitting. Strangely, when a patch of concrete had to be repaired on my driveway, we were told that the patch would have to "cure" for a minimum of 30 days before re-painting to match the rest of the driveway. Go figure...
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