Effects of Adsorption Group and Molecular Weight of Viscosity-Modifying Admixtures on the Properties of Cement Paste
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 7
Abstract
To explore the potential application of high-performance viscosity-modifying admixtures (VMAs) is of great importance. In this work, the effects of the adsorption group and molecular weight of VMAs on the properties of fresh cement paste were studied. A series of copolymers having similar molecular weights but different adsorption groups (carboxyl, sulfonic, and quaternary ammonium groups) were compared for the first time. A series of copolymers having the same chemical structure but different molecular weights were also compared. The adsorption, fluidity, bleeding, and rheological properties of the fresh cement paste mixed with different copolymers were tested. The results show that the copolymer, having stronger adsorption group (carboxyl group) and higher molecular weight, could decrease the bleeding and fluidity while enhancing the stability of the fresh cement paste more effectively. The study may help explore ideal materials for the design and preparation of synthetic polymer VMAs.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the National Key Research and Development Program of China (Nos. 2020YFC1909900 and 2017YFB0310100), the National Science Fund for Distinguished Young Scholars of China (No. 51825203), the National Natural Science Foundation of China (No. 52178213), the Natural Science Foundation of Jiangsu Province (Nos. BK20211030 and BK20211031), the Technology Research and Development Planning Project Program of China State Railway Group Co. Ltd. (Nos. N2020G046 and K2020G035).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 7 • July 2022
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© 2022 American Society of Civil Engineers.
History
Received: Jul 7, 2021
Accepted: Nov 22, 2021
Published online: Apr 26, 2022
Published in print: Jul 1, 2022
Discussion open until: Sep 26, 2022
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