Effects of EPS, Mn–Zn Ferrite, and Layers on the Electromagnetic Absorption Performance of Magnesium Phosphate Cement
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 2
Abstract
In view of the excellent bonding capacity, rapid hardening, and high early strength, magnesium phosphate cement (MPC) functionalized with impedance matching agent of expanded polystyrene (EPS) and absorber of Mn–Zn ferrite that exhibits excellent electromagnetic wave absorption performance (EWAP) is fabricated to shield the construction of buildings against the ever-increasing electromagnetic radiation hazards. Influences of EPS and Mn–Zn ferrite contents and layers of specimens on the reflection loss (RL) of MPC in the frequency range of are systematically investigated. Test results demonstrate that EPS and Mn–Zn ferrite significantly enhance the EWAP of MPC due to the porous structure effect by EPS and multiple magnetic loss effects by Mn–Zn ferrite. MPC with double-layer structure shows an optimal EWAP as featured by a peak RL value of and a bandwidth of 17 GHz below . The electromagnetic energy absorbing mechanisms of MPC are further analyzed with scanning electron microscopy/energy disperse spectroscopy (SEM/EDS) and X-ray diffraction (XRD) results. In view of structural strengths, the modified MPC is able to repair damaged concrete of prefractured specimens, which ensures the reliability and rapidity of electromagnetic radiation protection.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors wish to acknowledge the financial support by the National Natural Science Foundation of China (No. 51908182), the Natural Science Foundation of Hebei (No. E2020202043), the Graduate Innovation Funding Project of Hebei Province (No. CXZZBS2021024), and the National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact (No. 6142902200304).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Feb 25, 2022
Accepted: May 23, 2022
Published online: Nov 30, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 30, 2023
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