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减水剂是混凝土外加剂的一种。据有关材料介绍,在混凝土中掺用减水剂有以下作用:不必加大水量能获得大塌落度混凝土;能在水泥标号不够时,配制超标号特强混凝土。如可将600#水泥配制成600#以上甚至800#混凝土;能减少用水,节约水泥,提高早期强度,减少干缩,增强抗裂性能等。不少部门对高效减水剂的研究已取得了一些成果。如某机场,以预应力板作混凝土对钢筋握裹力的放张试验,凡掺有FDN者回缩2.3公
Water-reducing agent is a concrete admixture. According to the introduction of relevant materials, admixture of superplasticizer in concrete has the following effects: no need to increase the amount of water to obtain a large slump concrete; can be formulated in excess of cement standard super-strong concrete. As 600 # cement can be formulated into more than 600 # even 800 # concrete; can reduce water, save cement, improve early strength, reduce shrinkage, enhance crack resistance and so on. Many departments of superplasticizer research has made some achievements. Such as an airport, with prestressed concrete panels on the bar for the laying of the test, where the FDN were retracted 2.3