Controlling Surface Chemical States of Halloysite Aerogel for Concrete Composites with Improved Thermal Insulation
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 7
Abstract
The stability and dispersion of aerogel in concrete is the key to evaluation of the thermal insulation performance of the aerogel/concrete system. This study focuses on the structural stability of aerogel under the effect of factors such as hydrophilic concrete system, mechanical mixing, and interaction between aerogel and the concrete matrix. Stable aerogel/concrete materials were prepared by regulating and controlling kinetic parameters of the surface of halloysite (HNT) aerogels. Characterizations of the samples were investigated using techniques such as Fourier-transform infrared spectrometer, thermogravimetric analysis, adsorption-desorption isotherms, scanning electron microscope, and thermal constant analyzer. The results indicated that the surfactant successfully attaches to the surface of the HNT aerogels. Aerogel particles are stable in concrete and kept their original shape. The thermal conductivity of concrete becomes lower as the content of HNT aerogels increases.
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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 Natural Science Foundation of Tianjin City (Grant No. 18JCQNJC03000), the National Natural Science Foundation of China (Grant No. 51772202), and the China Postdoctoral Science Foundation (Grant No. 2019M651052).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 22, 2019
Accepted: Oct 18, 2019
Published online: Apr 20, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 20, 2020
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