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由城乡建设环境保护部下达的1983年城乡建设科研项目“NC—Ⅱ型混凝土负温早强剂”,由山东省建筑科学研究所承担,已完成试验研究工作,并试产六百多吨,用于三万立方米以上的混凝土。1986年11月21日,山东省建筑总公司受建设部科技局委托,在青岛市召开了鉴定会。与会代表共56人,通过讨论认为,这种外加剂具有在常温、低温、负温和正负交变条件下,使混凝土有显著的早强、增强作用和抗冻害功能,提高混凝土的物理力学性能,对钢筋无促锈作用。NC-Ⅱ有显著的减水作用,其减水率可达10～20％。NC-Ⅱ的组成中未引入各类常用的防冻剂(如氯盐、硝酸盐、亚硝酸盐、碳酸盐等)而能在一定的负温下
The 1983 urban and rural construction scientific research project issued by the Ministry of Urban and Rural Construction and Environmental Protection “NC-II concrete negative temperature and early strength agent” was undertaken by the Shandong Institute of Building Research, and has completed experimental research and trial production of more than 600 tons. Used for more than 30,000 cubic meters of concrete. On November 21, 1986, Shandong Provincial Construction Corporation was commissioned by the Ministry of Construction Technology Bureau to hold an appraisal meeting in Qingdao. A total of 56 participants were present. Through discussion, the additive was found to have significant early strength, reinforcing effect and freeze-thaw resistance at normal temperature, low temperature, negative temperature, and positive and negative alternations, and improved the physical and mechanical properties of concrete. No rust-inhibiting effect on steel bars. NC-II has a significant water-reducing effect, and its water reduction rate can reach 10-20%. In the composition of NC-II, various commonly used antifreeze agents (such as chlorine salt, nitrate, nitrite, carbonate, etc.) are not introduced and can be operated at a certain negative temperature.