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我国自五十年代初即开始进行冬期施工,当时以氯盐做防冻剂,七十年代初开始使用亚硝酸钠作防冻剂。亚硝酸钠不仅能防冻、早强,还兼有阻锈作用,比氯盐优越得多。但由于亚硝酸钠货源紧缺,远不能满足使用需要,我们参阅有关资料,感到尿素不仅货源广,且防冻性能也好,故对以尿素为主的防冻剂进行了研究。一、试验概况试验分两部分进行,第一部分主要利用冰箱,并与冬期自然气温对比。第二部分是以工地试验资料为主,试验结果详见图1、2、3。从图1曲线可以看出:尿素+NC优于
China began construction in the winter in the early 1950s. At that time, chlorine salt was used as an antifreeze, and sodium nitrite was used as an antifreeze in the early 1970s. Sodium nitrite can not only prevent freezing, early strong, but also have a rust effect, much better than the chlorine salt. However, due to shortage of sodium nitrite, it is far from being able to meet the needs of use. We refer to the relevant information, and feel that urea not only has a wide supply, but also has good antifreeze performance. Therefore, research has been conducted on urea-based antifreeze agents. I. Test Overview The test is conducted in two parts. The first part mainly uses the refrigerator and compares it with the natural winter temperature. The second part is based on site test data. See Figure 1, 2, and 3 for the test results. From the curve in Figure 1, we can see: urea + NC is better than