Colorado · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on Colorado DOT projects?
Concrete must be placed at 50–90°F [1][4]; use heated water/aggregates (≤10°F batch variation) [1], avoid flash set by pre-charging water/aggregates [1], and prevent freezing by maintaining pavement ≥40°F until 2000 psi strength [2]. Maturity meters (3/day) are required if air temps drop below 40°F (or 45°F per Engineer) [2]. Cores/petrographic tests are mandatory if concrete freezes before 2000 psi [2].
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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.