Investigation on the electromagnetic wave absorption properties of foamed cement-based materials. (18th January 2023)

• Record Type: Journal Article
• Authors: Bian, Pengfei; Zhan, Binggen; Gao, Peng; Yu, Qijun; Yang, Yonggan; Hong, Li; Zhang, Wenliang
• Is Part Of: Construction & building materials. Volume 364(2023)
• Publication Date: 2023-01-18
• Subjects: Foamed cement-based materials -- Electromagnetic parameters -- Electromagnetic wave absorption -- Effective absorption bandwidth -- Pore size; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.129903
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The optimized foamed cement-based materials obtained excellent EMW absorption performance. The introduction of pores optimizes the impedance matching of the foamed cement-based materials. The porosity, sample thickness, and pore size have remarkable effects on the EMW absorption performance. Scattering and multiple scattering greatly increase the EMW attenuation of foamed cement-based materials. Abstract: To prevent the electromagnetic pollution of the architectural space, the foamed cement-based materials with high electromagnetic wave (EMW) absorption performance and wide effective absorption bandwidth (the reflectivity less than −10 dB) was fabricated in this study. EMW absorption performance of foamed cement-based materials was investigated, and the mechanism of EMW transmission and attenuation were analyzed. The results show that porosity, sample thickness, and pore size have remarkable effects on the EMW absorption performance. With the porosity of 61.5 %, the thickness of 40 mm, and the mean pore diameter of 301 μm, the effective absorption bandwidth reaches 12.7 GHz in the range of 2– 18 GHz. The excellent EMW absorption capacity of foamed cement-based materials is mainly due to the introduction of pores, which improve the impedance matching properties and increase scattering and multiple scattering as well as coherent attenuation. Foamed cement-based materials with high EMW absorption performance, low bulk density, and cost can be deemed an ideal candidate for EMW absorption in engineering.