Allowable Concrete Temperatures. a. Cold Weather: When depositing concrete in freezing or near‐freezing weather, concrete mix temperature shall be between 50o and 900 F when cement is added. Maintain a concrete temperature of 50o F. minimum for 72 hours minimum after placing or until concrete has thoroughly hardened. When necessary, heat concrete materials before mixing. Take necessary precautions to protect transit‐mix concrete.
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