1, the content of portland cement is high, and the content of tricalcium silicate and tricalcium aluminate in portland cement is high. Because there are many materials, the hydration and hardening speed is faster, the early strength is higher, and the heat released by hydration is more, which is beneficial to prevent concrete from being frozen in the early stage.
2. Portland cement and ordinary portland cement should be selected.
3. Slag Portland cement, pozzolanic Portland cement and fly ash Portland cement should not be used.
Extended data When the outdoor daily average temperature is stable below 5℃ for five consecutive days, the winter construction starts and the winter temperature drops. In many areas, the temperature is below 0℃ (negative temperature), and the moisture contained in soil, concrete and mortar. It will freeze and the building materials will be brittle, which will bring many difficulties to the construction. When the average temperature is lower than 5℃ or the daily minimum temperature is lower than -3℃ for five consecutive days, winter construction measures should be taken to ensure the engineering quality.
Because winter construction needs thermal insulation covering, which consumes a lot of heat energy and increases the project cost, we should try to avoid site leveling, foundation treatment, outdoor decoration, roof waterproofing, high-altitude pouring concrete and other projects. For projects that have to be constructed in winter, winter construction measures should be formulated according to local conditions to keep abreast of temperature changes.
Baidu Encyclopedia-Winter Construction