Microwave Absorbing Mortar Using Magnetic Hollow Fly Ash Composite as Absorbent
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 6
Abstract
A new type of microwave absorption cement-based material was prepared by using a magnetic hollow fly ash microspheres composite as the absorbent. Through the chemical precipitation method, a nano- layer was coated on the surface of HFAM to obtain the composite. Then the composite was added into mortar to prepare microwave absorption cement-based material. The mineral components, micromorphology, and electromagnetic parameters of the composite and the reflection loss of the cement-based material were investigated. It was found that the composite had superparamagnetism, and its saturation magnetization and the residual magnetization were and almost zero, respectively. The best microwave absorption of the cement-based material was obtained at 3% composite to cement, of which the bandwidth of the reflection loss lower than (responding to 90% microwave absorption) was nearing 8 GHz, showing excellent microwave absorption performance.
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Acknowledgments
The work presented in this paper was supported by the National Natural Science Foundation of China (Nos. 51372183, 50902106, and 51461135005), and the program of New Century Excellent Talents in University of China (No. NCET-10-0660).
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 29, 2017
Accepted: Dec 4, 2017
Published online: Apr 12, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 12, 2018
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