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目前我国混凝土冬季施工使用的外加剂大体可分为两类,一类为以氯盐为主的防冻剂,一类为不含氯盐的防冻剂,前一类由于易引起钢筋的锈蚀使用量逐渐减少,后一类的使加量在逐渐增多。不含氯盐的防冻剂以硝酸盐,亚硝酸盐,尿素及其复合物为多、其中以亚硝酸盐的复合防冻剂效果较好,但目前我国亚硝酸盐资源短缺,不能满足供应。采用外加剂进行混凝土冬季施工又必须解决从
At present, the admixtures used in concrete construction in winter in China can be broadly divided into two categories. One is an anti-freeze agent based on chlorine salts, and the other is an anti-freeze agent free of chlorine salts. The former type can easily cause corrosion of reinforcing steel bars. Gradually decreased, the latter increased gradually. Chloride-free antifreeze contains more nitrates, nitrites, urea and its complexes. Among them, the composite antifreeze with nitrite is effective, but at present, there is a shortage of nitrite resources in China, which can not meet the supply. The use of admixtures for winter concrete construction must be resolved from