Cold Weather Requirements Concrete

(1)  When the air temperature is below 5°C , concrete shall be,

    (a)   kept at a temperature of not less than 10°C or more than 25°C while being mixed and placed, and

    (b)   maintained at a temperature of not less than 10°C for 72 h after placing.

    (2)  No frozen material or ice shall be used in concrete described in Sentence (1).

Article 9.3.1.9 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.