Rheological Properties of Nanosilica-Modified Cement Paste at Different Temperatures and Hydration Times
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 1
Abstract
This paper investigates the temperature–time evolution of the rheological properties of nanosilica (NS)-modified cement paste. A rheometer was used to determine the rheology curves of the paste at 20°C–40°C within 2 h and fitted to the Bingham model. Fluidity, free water content, isothermal calorimetry, and thermogravimetric analysis were used to explain the temperature–time evolution. The results showed that the temperature–time evolution of rheological parameters of NS-modified paste was linear. Both the yield stress and plastic viscosity of cement paste increased with increasing NS dosage and related to the free water content. On account of the flocculation of NS, the initial values of the rheological parameters became larger, and the higher the temperature, the larger the values. The evolution rate of yield stress over time was . The initial value of the thixotropy with NS increased by orders of magnitude compared with the control group, while the development of thixotropy was very sensitive to temperature. There was a small initial thixotropic value and a fast increase rate at 30°C, which was an ideal evaluation model. The dominant factor in the dormant period of evolution was the destruction and reconstruction of C-S-H bridges.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 51778269), the Key Research and Development Program of Shandong Province (2019GSF110002), and the Case-by-Case Project for Top Outstanding Talents of Jinan. We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Oct 7, 2019
Accepted: Jun 11, 2020
Published online: Oct 20, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 20, 2021
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