论文部分内容阅读
高温季节浇筑大体积混凝土,应控制混凝土的浇筑温度。近几年来,发现液氮是一种有吸引力的降温剂。液氮是一种-195.6℃的不活泼液体,是通过对空气加压和冷却制备的。液氮用来冷却拌合水,生成一种冰—水浆状混合物。根据要求冷却程度的高低,也可用来冷却水泥。液氮对于混凝土质量并无有害的影响,而只是利用它的冷却能力。当液氮接触另一种材料(如拌合水)时,便使这种材料迅速冷却,而它自身则蒸发并完
When pouring large volumes of concrete in the hot season, the pouring temperature of the concrete should be controlled. In recent years, liquid nitrogen has been found to be an attractive cooling agent. Liquid nitrogen is a -195.6°C inactive liquid that is prepared by pressurizing and cooling the air. Liquid nitrogen is used to cool the mixing water, producing an ice-water slurry mixture. According to the degree of cooling required, it can also be used to cool the cement. Liquid nitrogen does not have a detrimental effect on the quality of the concrete, but only uses its cooling capacity. When liquid nitrogen comes into contact with another material (such as mixing water), the material is quickly cooled and it evaporates and ends