What are the rules for placing concrete in cold weather on Wyoming DOT projects?

"Ensure that concrete delivered in air temperatures below 40 °F [5 °C] arrives at the project at a temperature from 60 °F [15 °C] to 90 °F [30 °C]." [1] "Provide adequate lighting when paving during dawn or dusk or at night. Do not place pavement during rainy weather . Ensure the concrete temperature is between 50 °F and 90 °F [10 °C and 30 °C] during placement. Provide uniform cooling or heating of the aggregate to maintain the mix in this temperature range." [2] "When stabilizers are used, use in accordance with manufacturer's recommendations to increase maximum placing time, not to exceed additional 90 minutes. Apply an evaporation retardant after placement to exposed concrete surfaces which cannot be protected immediately with the curing medium." [5] "As applicable, admixture dosage rates in the approved mix design may be adjusted within the manufacturer’s normal dosage range without requiring a new mix design." [5]

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