Influence of Polycarboxylate Superplasticizers with Different Functional Units on the Early Hydration of C3A-Gypsum

Influence of polycarboxylate superplasticizers (PCs) with different functional units on the hydration heat and hydration products of C3A-gypsum was investigated. Three kinds of PCs with different monomers were discussed. It was seen that PCs mainly shortened the induction stage of C3A-gypsum hydration, and the amount of remaining gypsum was related to the duration of the induction stage. The second heat flow peak of the sample with PCs was higher than that of the blank. Moreover, PC intercalation occurred during the hydration.Keywords:polycarboxylate superplasticizers;C3A-gypsum;functional units;hydration