三峡二期工程使用混凝土外加剂的几个问题

Some Problems Concerning Admixtures Used in Concrete for 2nd Stage Construction of TGP

对三峡二期工程混凝土选用外加剂的几个问题，如普通减水剂和高效减水剂哪种合适，减水剂对碱－骨料反应有无影响，如何提高大坝混凝土的耐久性等作了阐述。认为在使用人工骨料的情况下，应选用高效减水剂并复合添加有缓凝和引气作用的普通减水剂和引气剂，使混凝土拌和物具有缓凝、引气和减水性能，在满足设计标号的情况下，可大幅度地提高混凝土的耐久性。

Some problems relating to select concrete admixtures used in the TGP, such as how to select the rational water reducing admixtures(common or high efficient), whether there is influence of water reducing agent on alkaline aggregate reaction, and how to raise the durability of concrete etc., are presented in the paper. It is considered that, in the case of using artificial aggregate, selecting the high efficiency water reducing admixtures, associating with common retarding and air entraining agents, the concrete possesses retarding, air entraining and water reducing characteristics and may greatly raise its durability under meeting the condition of design concrete label.