用热拌掺外加剂法进行混凝土冬季施工,已显示出很大优越性。此法不仅省工省料、方便易行,而且能保证质量。但不同标号混凝土早期受冻后强度发展有何规律,掺加几种常用外加剂的混凝土,早期受冻后较不掺者强度发展有何不同等问题,一直为人们所关注。为此,我们做了部分试验,现简介如下。 The use of hot mix-admixture admixtures for concrete construction in winter has shown great advantages. This method not only saves labor, materials, convenience, but also guarantees quality. However, it is always concerned about the regularity of the strength of different grades of concrete after it has been frozen, how concrete is mixed with several commonly used admixtures, and whether the strength of the concrete is different after being frozen in the early stage. To this end, we have done some experiments and are now described below.