Rheology and Porosity of Ultralow Density Foamed Cement Pastes Derived from Ordinary Portland Cement and Hydrogen Peroxide
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 4
Abstract
Foamed cement-based materials possess outstanding flame resistance, fire thermal, and sound insulation, but it is difficult to obtain the desired porosity and pore size due to the complicated equilibrium relations between the fresh paste rheology and hardened porous matrix. In this article, we develop ultralow density porous Portland cement pastes to evaluate the rheological properties and foaming process. The results show that air permeability and temperature are essential parameters for altering the pore size of foamed cement pastes. Furthermore, the equilibrium relationships between the pore radius and the rheological parameters of cement pastes are established. Moreover, the mix ratio design of foamed cement pastes is also promoted. Accordingly, this work sheds light on the formation mechanism of the porous structure for ordinary Portland cement pastes, as well as presents a new strategy towards fabricating other inorganic materials with desired porosity and mechanical property.
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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 jointly supported by the National Science Foundation of China (52008359), Sichuan Science and Technology Program (2019YJ0554), China Postdoctoral Science Foundation (2020M673284), Deyang Key Science and Technology Program (2019SZ74), as well as the Opening Fund of State Key Laboratory of Green Building in Western China (LSKF202115). We are grateful to Wang Hui (Analytical & Testing Center, Sichuan University) for her help in SEM observation and Chen Li (Analytical & Testing Center, Sichuan University) for her help in the Micro-CT test.
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Received: Mar 2, 2021
Accepted: Sep 3, 2021
Published online: Jan 24, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 24, 2022
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