Illinois · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on Illinois DOT projects?
Concrete must be protected when air temps drop below 45°F (7°C) or during Dec 1–Mar 15. Protection (insulation with R-values per pour thickness/temp or heated enclosures) must be approved by the Engineer and kept in place until concrete is 7 days old (96 hrs for approach slabs). Concrete temps must stay ≥40°F (4°C) for 48 hrs post-placement, with gradual cooling if temp differential exceeds 35°F (19°C). Placement stops when air temps fall to 40°F (4°C) or below (35°F/2°C for non-structural concrete) unless approved. Pre-placement materials/equipment must be approved, and a cold weather plan (e.g., heated materials) is required if temps <17°F (-8°C) [1,3,5].
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