Iowa · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on Iowa DOT projects?
Do not place concrete against surfaces below 40°F; heat mix water/aggregates to 50–80°F. Use heated housing/insulation to maintain ≥50°F for 48+ hours, monitor temps for 96 hours. If submerged ≥1 ft below water, use ≥50°F water for 96 hours, no freezing for 10 days. [1,3]
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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.