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

"B. Cold Weather Concreting. Defined as when the weather forecast predicts air temperatures below 35 °F at any time during the specified curing and protection period following concrete placement. Assume all risk for placing concrete during cold weather. Replace frozen or damaged concrete at Contractor expense." [1] "Remove ice, snow, and frost from the forms, subgrade, adjacent concrete, and reinforcing bars before placing concrete. Do not place concrete on frozen base or" [1] "1. Cold Weather Plan. Include, as a minimum, the following items in the cold weather concreting plans:" [2] "a. Materials, details, and locations for insulating blankets, enclosures, or other methods to be used to protect concrete from cold weather." [2] "Submit a written plan for hot or cold weather concreting in accordance with Subsection 551.03.6 when temperature extremes are anticipated." [3] "Furnish concrete at between 50 to 85 °F for placing when the air temperature is less than 35 °F. Heat the concrete in accordance with Subsection 551.03.6(B) ." [3] "Clear form work of snow, ice, and frost before placing concrete." [3]

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