In accordance with Chapter 7 of the national standard “Code for Construction and Acceptance of Concrete Structure Engineering” (GB50204), based on local temperature data for many years, when the outdoor daily average temperature is stable below 5℃ for 5 consecutive days , concrete project construction should enter winter construction. At this time, the first day when the temperature is stable below 5℃ for 5 consecutive days is the initial day of winter construction. Similarly, when the temperature rises, the last day when the temperature is stably higher than 5℃ for 5 consecutive days is the end day of winter construction.
Therefore, the winter construction period of concrete can be determined as:
Determined based on historical meteorological data, In autumn and winter, the specific date for concrete winter construction is from the initial day when the temperature is stable below 5℃ for 5 consecutive days to the end day when the temperature is stable above 5℃ for 5 consecutive days in the spring of the following year. However, it should also be noted that outside the above period, sometimes due to a cold wave, the temperature may temporarily drop below 0°C. However, after the cold wave passes, the sun will appear again and the temperature will rise. Therefore, care should also be taken to prevent the concrete from freezing damage during this sudden cooling period. .
Winter construction of concrete projects is different from normal temperature construction. Since the natural temperature has dropped below 0℃, corresponding insulation measures must be taken in all aspects of the entire construction process. Measures against freezing, wind, and water loss. Try to create a positive temperature maintenance environment for concrete so that concrete can solidify, harden, and increase strength continuously to avoid and reduce freezing damage to concrete.
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