On a hot, windy Mississippi paving day, what is the principal fresh-concrete risk and a standard control?

1. The concrete will freeze in the truck; heat the mix above 100°F
2. Rapid evaporation can cause plastic-shrinkage cracking; cool the mix, dampen the base, place and finish promptly, and start curing immediately
3. Hot weather permanently prevents hydration, so the pour should be cancelled whenever the air is above 70°F
4. Wind improves curing, so leave the surface bare as long as possible