Effect of the Chemical Nature of Polyvinyl Alcohol on the Microstructure of Cement Hydration Products
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
The influence of chemical nature of polyvinyl alcohol (PVA) on the microstructure of cement hydration products was investigated. Thermal analysis, X-ray diffraction, nuclear magnetic resonance (NMR), and scanning electron microscope were used to explore the microstructure and content of cement hydration products. The pore structure of the matrix was measured by a mercury intrusion porosimeter. in PVA-modified cement composites showed multidirectional growth, and its platelike structure was distorted due to the intersection of different growth orientations. The decomposition temperature of in PVA-modified cement composites was lower than in unmodified cement composites, which was greatly affected by degrees of polymerization of PVA. Besides, the mean chain length of calcium silicate hydrate (C-S-H) gels showed an increasing trend with the increase of degrees of hydrolysis and polymerization of PVA, but it was less than that of unmodified cement composites. The incorporation of PVA increased the porosity, but refined the pore-size distribution of the matrix. PVA film between layered and on the surface of cement hydration products acted as an additional bond and increased the internal cohesion of the matrix.
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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
The authors acknowledge the Joint Funds of National Natural Science Foundation of China (No. U20A20324) and National Natural Science Foundation of China (No. 51878116).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jan 20, 2022
Accepted: Nov 22, 2022
Published online: Apr 27, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 27, 2023
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