怎样才能使混凝土中的水在冬季里不結冰呢?这是建筑工程界最关心的一个問題。在祖国遙远的北方,施工季节只有七个月左右。其他5个月,由于严寒的降临,不可能再进行澆灌混凝土。假如在严寒中澆灌,混凝上中的水就容易結冰,体积膨脹,混凝土就要冻坏了。为了能够在冬季进行施工,加速建設的速度,世界各国的工程师和科学家們想出了許多冬季施工的方法,比如:蓄热法,暖棚法,电加热法,蒸汽加热法等。这些方法都已經被我国所采用。这些方法的基础是:先將拌制混凝土的材料加热,使混凝土的溫度上升到0℃以上,这样混凝土就不会在运往工地和澆灌的过程中受冻了;其次,澆灌后的混凝土,还要保溫或加热,使它在冷却到0℃之前,已經获得相当的强度,而不会再害怕冻坏。这些方法虽然是很妥善,但是却不經济,成本比夏季 How can we make the water in concrete not freeze in the winter? This is a problem most concerned by the construction engineering community. In the far north of the motherland, the construction season is only about seven months. In the other five months, due to the severe cold, concrete can no longer be poured. If water is poured in the cold, the water in the coagulation will easily freeze, and the volume will swell, and the concrete will freeze. In order to be able to carry out construction in the winter and accelerate the speed of construction, engineers and scientists from all over the world have come up with many methods for winter construction, such as: heat storage, warming, electric heating, and steam heating. These methods have all been adopted by our country. The basis of these methods is: first heating the material of the mixing concrete, so that the temperature of the concrete rises above 0°C, so that the concrete will not be frozen during the transportation to the construction site and the irrigation; second, the concrete after pouring, also Keep it warm or heated so that it has gained considerable strength before it cools to 0°C without fear of freezing. Although these methods are very good, they are not economical and costly than summer