Rheological Properties of Fresh Cement Paste Modified by In Situ Polymerization of Acrylamide Monomer
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
To explore the modification of rheological behavior of fresh cement paste by in situ polymerization, the rheological properties of fresh in situ polymerization modified cement (IPMC) pastes with various acrylamide (AM) monomer dosages and resting time were investigated by rheology test in this paper. The interaction mechanism between inorganic-organic components of IPMC paste and its influence on rheology are also discussed. The results revealed that the yield stress and plastic viscosity of fresh IPMC paste decreased as the AM dosage increased, and rose rapidly with the resting time when the AM dosage was more than 5%. The time-dependent rheological properties of IPMC paste were associated with various periods of AM polymerization reaction. This paper also found that the dispersing effect produced by the AM adsorption and the flocculating effect generated from the polyacrylamide (PAM) microgels bridging would jointly impact the structural buildup of IPMC paste; the former improved the rheological properties and fluidity, while the latter acted contrary. Our results provide the underlying insights needed to guide the dynamic regulation of rheological properties of cement-based materials by in situ polymerization modification.
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Data Availability Statement
All data, models, and codes generated or used during the paper appear in the published article.
Acknowledgments
Financial support by National Natural Science Foundation of China (Nos. 51922109 and 52008113), Opening Foundation of Research and Development Center of Transport Industry of New Materials, Technologies Application for Highway Construction and Maintenance of Offshore Areas (Fujian Communications planning & design institute Co., Ltd.) (No. 2021003), and Science and Technology Program of Fujian Province (No. 2022Y0079) are greatly appreciated.
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Received: Nov 8, 2022
Accepted: May 18, 2023
Published online: Sep 28, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 28, 2024
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