New varieties of concrete are increasing. The application of superplasticizer also promotes the improvement of concrete construction technology and the leap of concrete quality. In view of the doubts of many friends about Polycarboxylic Water reducer, this paper details the knowledge of Polycarboxylic Water reducer. The performance and structure of polycarboxylic water reducer are unique. It has strong dispersion ability and persistence. The water reducer has a high water reducing rate, so it will become the dominant direction of the development of water reducer in the future.
The optimum dosage of various water reducing agents is different. Naphthalene water reducer is about 0.5% - 1.5% of cement quality, and the strength increases to 10% - 25%. In the concrete admixture large or low dosage (relative to the best dosage) often appear completely different, unexpected effect. Such as "slump" loss rate, bleeding size, retarding and condensation. Different admixtures have different suitable dosage ranges, and neither less than or greater than this range can play its essential role. Over-dosage will prolong the setting time, water reduction rate and strength increase slightly, especially wood calcium. Over-dosage will cause long-term non-condensation of concrete. Excessive dosage of superplasticizer can cause serious bleeding, poor workability and unreasonable technology and economy.
