冬季大气温度低,污水铸铁管接头捻口施工往往受到影响。为此,我们选用了不同水泥和外加剂,拟定了几种负温早强捻口水泥配方,经铸铁管接口水压试验,技术效果良好,现已开始用于工程中。一、试验过程及环境温度铸铁管接口试件用水泥捻好后,立即置于室外自然养护,不加任何覆盖。室外大气 In winter, the temperature of the atmosphere is low, and the construction of sewage cast iron pipe joints is often affected. To this end, we have chosen different cements and admixtures, and formulated several negative temperature and early strength cornice cement formulations. After the hydraulic pressure test of the cast iron pipe joints, the technical effect is good and it is now used in the project. First, the test process and the ambient temperature cast iron pipe interface specimens were cemented and immediately placed in outdoor natural conservation without any covering. Outdoor atmosphere