Electromagnetic shielding and absorption properties of fiber reinforced cementitious composites |
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Authors: | Xiuzhi Zhang Wei Sun |
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Affiliation: | 2* (1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China; 2. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China) |
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Abstract: | In order to investigate the electromagnetic shielding effectiveness (SE) and absorbing properties of fiber reinforced concrete,
steel fiber, carbon fiber and synthetic polyvinyl alcohol (PVA) fiber reinforced concrete were researched. The results show
that with the increase of fiber volume fraction, the SE and trend of frequency change of corresponding fiber reinforced concrete
are enhanced. When the volume content of steel fiber is 3%, the SE of concrete is above 50 dB and its frequency is above 1.8
GHz. Moreover, in the range of 8–18 GHz, steel fiber, carbon fiber and PVA fiber all can improve the microwave absorption
properties of concrete. The concrete with 0.5% carbon fiber can achieve the best absorbing property, the minimum reflectivity
is about −7 dB; while steel fiber optimal volume fraction is 2%. The reflectivity curve of PVA fiber reinforced concrete fluctuates
with the frequency, and the minimum value of the reflectivity is below −10 dB. The results show that fiber reinforced concrete
could be used as EMI(electromagnetic interference) prevention buildings by attenuating and reflecting electromagnetic wave
energy. |
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Keywords: | steel fiber carbon fiber fiber-reinforced cementitious composites shielding effectiveness (SE) absorption properties |
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