砂浆在冬季施工中,采用附加剂来降低冰点,以加速其硬化过程,是一种比较好的方法。过去常用氯化钙、氯化钠及其复盐作附加剂,一般只能在-10℃左右的气温下使用;如用碳酸钾等则价钱又很贵。我们经过长期的试验,探求出用10%氯化钙和2%氯化镁作抗冻剂,应用在抹灰工程上,能在-25℃的严寒 In the construction of winter mortar, it is a better method to use additive to reduce the freezing point to accelerate the hardening process. In the past, calcium chloride, sodium chloride and their double salts were often used as additives, and they were generally used only at temperatures of about -10°C. For example, potassium carbonate was expensive. After a long period of trials, we found that 10% calcium chloride and 2% magnesium chloride are used as anti-freezing agents. When applied to plastering works, they can be cold at -25°C.