Building my home is a house, and the second floor is cast-in-place concrete. Can it fall at MINUS 2 degrees?

Yes, but you need to take warm measures.

According to the temperature, structural characteristics and site energy conditions:

1, when the lowest temperature is not lower than-15℃ and the surface area coefficient of the structure (the ratio of surface area to volume) is not greater than 5, the heat storage method should be adopted;

2. If the structural surface coefficient is above 5, there are early strength requirements and the power supply conditions are good, the electrothermal method can be used;

3. When the surface coefficient of the structure is relatively large, such as columns, beams and plates, and there is enough steam available, the steam method can be used. In addition, for precast concrete member joints, wallboard joints and cast-in-place ring beams, far infrared rays or electromagnetic induction heating can also be used to achieve early strength effect.

Extended data

Therefore, in the process of concrete mixing, transportation, pouring and tamping, measures must be taken to prevent the heat from emitting too fast. When preparing concrete at negative temperature, water and sand can be properly heated, but the temperature of water-sand mixture can't exceed 40℃, otherwise false setting will easily occur when cement is put into use.

Strengthen the preparation of winter application, prepare heat source in advance, and improve the quality level of winter application. Improve the quality of construction personnel and conduct necessary training and re-education for winter construction management personnel to meet the requirements of winter construction management.

Make clear the winter construction projects, formulate feasible technical measures for winter construction on the premise of ensuring the quality and progress of the project, and prepare materials for winter construction at the same time.

In winter, when a cold current strikes, the temperature will drop sharply. At this time, we should pay attention to the long-term and short-term weather forecast, grasp the temperature change in time, arrange the construction plan reasonably, and take necessary measures to keep warm and prevent freezing, so as to be prepared.

Baidu Encyclopedia-Winter Construction