轻骨料水泥基多功能吸波材料的制备及有限元分析

doi:10.11896/cldb.23080253

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Abstract In order to analyze the effects of lightweight aggregate type and particle size on the properties of wave absorbing materials, five kinds of lightweight aggregate with particle sizes ranging from micron to millimeter were used to prepare lightweight cement-based absorbing materials, and their electromagnetic parameters and reflection loss (RL) were tested. 2D cross-section model was constructed by finite element analysis method to simulate the electromagnetic field distribution inside the wave absorbing materials. The mechanical properties and thermal conductivity of the wave absorbing materials were tested. The results show that the impedance matching performance of cement-based materials and the average RL are improved via increasing the content of lightweight aggregate and particle size, as well as broaden the effective absorption bandwidth, and the absorption peak is moved to high frequency. When the thickness is 20 mm, the optimal RL of the wave absorbing material is -29.1 dB at the low frequency of 1.2 GHz and -20.9 dB at the high frequency of 5.9 GHz, and the maximum effective absorbing bandwidth can reach 14.49 GHz. The finite element simulation results show that the electromagnetic wave transmission direction can be changed by adding lightweight aggregate, the electromagnetic wave loss path is increased, and a strong loss is produced between neighboring aggregates, then the loss occurs inside aggregate, which provides a theoretical basis for the selection of aggregate type, particle size and the design of lightweight absor-bing materials. The density, mechanical strength and thermal conductivity of wave absorbing materials are reduced via increasing the particle size of lightweight aggregate, the wave absorption efficiency and the heat preservation effect are better.

Key words： aggregate size absorbing materials reflection loss finite element analysis mechanical property thermal conductivity

Published: 10 March 2024 Online: 2024-03-18

CLC number:

TB34

Fund:Pre-research and Exploration Projects of State Key Laboratory of Green Building Materials (ZA-79).

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	Articles by authors
	WU Zihao
	SU Ronghua
	MA Chao
	XIE Shuai
	JI Zhijiang
	WANG Yingxiang
	WANG Jing

Cite this article:

WU Zihao,SU Ronghua,MA Chao, et al. Preparation and Finite Element Analysis of Lightweight Aggregate Cement-based Multi-function Absorbing Materials[J]. Materials Reports, 2024, 38(5): 23080253-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23080253 OR http://www.mater-rep.com/EN/Y2024/V38/I5/23080253

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