在混凝土中掺入抗冻外加剂施工,使其本身具有负温下继续硬化的能力,并获得一定强度,这是冬瑚施工中的一项重要技术措施。早在六十年代,国内就有不少单位研究了以亚硝酸钠、氯化钠、三乙醇胺、尿素等为主的混凝土复合抗冻剂,解决了在-10℃温度下的冬期施工问题,但在严寒的北方地 The incorporation of antifreeze admixtures in concrete has the ability to continue to harden at negative temperatures and obtain a certain strength, which is an important technical measure in winter urn construction. As early as in the 1960s, many domestic companies studied composite anti-freeze agents based on sodium nitrite, sodium chloride, triethanolamine, and urea to solve the winter construction problem at -10°C. But in the bitter cold of the north