８０年代初，我国混凝土外加剂的应用量仅占水泥总产量的２％。到了９０年代初，我国混凝土外加剂发展日臻成熟，一些性能较低的老产品被淘汰，性能优异的新产品开发成功。这一阶段复合型产品大量面世并得到了市场的认可，有复合型（缓凝、泵送）减水剂、复合型（缓凝、泵... In the early 1980s, the application of concrete admixture in China accounted for only 2% of the total cement output. In the early 1990s, the development of concrete admixtures in China became more and more mature, some old products with lower performance were eliminated, and new products with excellent performance were successfully developed. At this stage, a large number of composite products have been introduced and recognized by the market. There are compound type (retarding, pumping) water reducing agents, compound type (retarding, pumping ...