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目前,应用化学外加剂的负温混凝土施工方法已经成为我国冬期混凝土施工的主要方法。化学外加剂已由单一型发展为复合型,而且复合外加剂的种类也越来越多。但究竟哪种类型的复合外加剂效果好而又较经济,这是施工单位最关心的问题。为此,我们做了专门的试验研究。现将试验研究情况介绍如下: 一、化学外加剂的选择和试验方法试验时,我们选用早强效果好的硫酸钠、氯化钠、NC和三乙醇胺等作早强剂,选用氯化钠、亚硝酸钠和尿素作抗冻剂。在
At present, the negative temperature concrete construction method using chemical admixture has become the main method of winter concrete construction in China. Chemical admixtures have evolved from a single type to a complex type, and there are more and more kinds of compound admixtures. However, what kind of composite admixture is effective and economical is the most concerned issue for construction companies. For this reason, we did a special experimental study. The experimental research is now described as follows: First, the choice of chemical additives and test methods When testing, we use good early results sodium sulfate, sodium chloride, NC and triethanolamine as early strength agent, use sodium chloride, Sodium nitrite and urea are used as antifreeze agents. in