我国北方地区,每年都有几个月,甚至半年多处于负温条件下,基本建设施工进度和施工规模受到很大限制。在无产阶级文化大革命运动推动下,我所广大工人、科研人员,遵照毛主席关于“打破洋框框,走自己工业发展道路”的伟大教导,为解决适合我国国情的负温混凝土硬化外加剂,进行了大量试验研究,提出以亚硝酸钠为抗冻剂的亚硝酸钠-硫酸钠(NaNO_2-Na_2SO_4)复合外加剂。在—5℃条件下第一阶段研究的基础上(第一阶段研究报告见本刊1976年第9期),进行了进一步的研究和推广应用。 In northern China, there are several months or even more than half a year in negative temperature conditions, and the construction progress and construction scale of the basic construction are greatly limited. Under the impetus of the proletarian cultural revolution, the majority of our workers and scientific researchers follow Chairman Mao’s great teaching of “breaking down the ocean and frame and taking the path of its own industrial development” to solve negative temperature concrete hardening admixtures suitable for China’s national conditions. A large number of experimental studies were conducted to propose sodium nitrite-sodium sulphate (NaNO 2 -Na 2 SO 4 ) composite admixture with sodium nitrite as an antifreeze agent. Based on the first-stage study under the condition of -5°C (the first-phase research report is published in the 9th issue of this publication in 1976), further researches and popularization and application were carried out.