Mechanism and application of polycarboxylate superplasticizer
Polycarboxylate water reducing agent (PCA) is a polymer surfactant prepared by copolymerization of a carboxyl group-containing unsaturated monomer and an unsaturated monomer containing other functional groups. It is a new generation of high-efficiency reduction after naphthalene-based water reducing agent. Aqueous agent is the most important concrete admixture today. The polycarboxylate superplasticizer has the characteristics of low dosage, high water reduction rate, good moisture retention performance, low concrete shrinkage and strong molecular designability, and has the advantages of no formaldehyde in production and use. It has been valued by researchers in various countries [, its products are used in various fields of engineering construction, and it has become a hot spot in the research and development of concrete admixtures. When the polycarboxylate superplasticizer is added to the cement slurry, it interacts with the cement particles to prevent the formation of flocculation structure and release the free water wrapped by the cement, so that the cement particles can be dispersed with each other, and the macroscopic performance is cement slurry. Has a certain dispersion performance.