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Around here in SE MIchigan if we see scale and pitting the mix was bad to begin with, then add to that the warm ground, cold air temps PLUS different cure rates top-to-bottom due to the temp. difference. Then there's evaporation due to wind and humidity (did they cover it with plastic sheeting?). People ask me when my buddy I do concrete (I do the removal/excavating and he does the pour/finish) "Is it quaranteed?" "Yes" we tell them. "We guarantee we'll do a good job and guarantee it will crack". If they balk at the "cracking guarantee" after we give them an explanation why their old concrete cracked, we don't work for them.
If you don't get anywhere with the builder, all the manger/owner of the concrete supplier and have them inspect it---don't waste time getting them there---sooner the better. If that doesn't work, don't sign off on the "Wavier of Lien" that the builder will have you sign.
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