Quality Control of Polycarboxylate Superplasticizer-Gel Permeation Chromatography

The control variables were used to study the accuracy of the gel permeation chromatography method, and the changes in polymer molecular weight and molecular weight distribution were studied on different architectures. Then, GPC-molecular weight comparison is performed between the standard sample and the synthetic sample, and the result is compared with the performance of cement paste mixed with water reducer. Gel permeation chromatography (GPC) analysis showed that: The Mn, Mw, and Mw values of the water reducer are different under different variables, and the most affected is the Mw-Mass-average molecular weight of the polymer. By comparison, it was found that the samples showed consistent physical performance results in the GPC and the fluidity of cement paste tests. In this regard, we can evaluate the stable quality of water reducer products through the Mw, it is an accurate and effective method to check the quality of Polycarboxylate superplasticizer products.