Thanks all for your replies. The concrete rep and my contractor looked at my job today, and are supposed to get back to me tomorrow. (My new job prevents me from being home whenever they decide to show up.) The job was done in two pours the same day, about 8am and noon. Temp was about 75...
My new driveway began hairline cracking the day after pouring, and has continued for two weeks, looking like a 2500 sq ft jigsaw puzzle. Contractor used good base, half-inch rebar on 2’ centers, and poured under good conditions. He tried patching the first cracks with some cement/epoxy...