Arizona · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on Arizona DOT projects?
Cold weather concrete placement on Arizona DOT projects requires: (1) No placement if ambient temp (shade, away from artificial heat) drops below 40°F or is forecasted to fall below 35°F; resume only when temp exceeds 35°F [6]. (2) Preheat forms, reinforcement, and substrates to ≥40°F (max 10°F above concrete temp) [6]. (3) Use chilled mix water, crushed ice, or cooled aggregate (sprinkling/liquid nitrogen) to control temps [6]. (4) Discontinue operations if temps fall below 40°F; ensure sufficient time to place/protect concrete before 35°F [6]. (5) Precast plants must submit a cold weather plan detailing temp monitoring and curing [1].
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Verika provides information with citations to help you find and understand the rules that apply to your work. It is not a substitute for professional engineering or legal judgment. Answer generated 2026-08-28; always confirm against the cited source for your project.