Electromagnetic Wave Absorbing Properties of Glass Fiber Reinforced Cement Composites with Special-Shaped Structure Surfaces

In order to reach high electromagnetic wave absorption property, here we developed a cement composites building materials. Special-shaped structure surfaces have been designed to make the continuity change of impedance and increase the incident times for electromagnetic wave. Different ratio of flexible glass fiber were introduced to adjust the impedance matching characteristics of the composites and to attenuate the incident wave by scattering. As the concentration of 9% glass fiber and the surface of rectangle, the reflectivity reached the highest in the absorber with 20mm thickness. the lowest reflection loss of-15.8 dB was obtained at 8.9GHz, and the effective absorption bandwidth (less than-8 dB) reached 12 GHz in the frequency range of 1.7~18 GHz. The new material can be used for building indoor electromagnetic radiation protection.

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Electromagnetic Wave Absorption Properties of Glass Fiber Reinforced Cement Filled with Carbon Black

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.127 ◽

2014 ◽

Vol 912-914 ◽

pp. 127-130 ◽

Cited By ~ 1

Author(s):

Yao Li Wei ◽

Yue Fang Zhang ◽

Wang Jun Hao

Keyword(s):

Carbon Black ◽

Electromagnetic Radiation ◽

Glass Fiber ◽

High Frequency ◽

Frequency Range ◽

Absorption Properties ◽

Testing Method ◽

Glass Fiber Reinforced ◽

New Material ◽

Reinforced Cement

In order to deal with the more and more serious problem of electromagnetic radiation pollution, cement-based composites were prepared by introducing glass fiber into cement as through wave reagent and carbon black as absorbing reagent . Arched testing method were used to test the reflection losses in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency compared with the pure cement. The filling ratio of carbon black and glass fiber as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-11.2 dB was obtained at 18 GHz of 9wt.% glass fiber and 5wt.% carbon black filled cement with thickness of 10mm. The new material can be used for building indoor electromagnetic radiation protection.

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Double-Layered Cement Composites with Superior Electromagnetic Wave Absorbing Properties Containing Carbon Black and Expanded Polystyrene

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.774-776.747 ◽

2013 ◽

Vol 774-776 ◽

pp. 747-752 ◽

Cited By ~ 1

Author(s):

Yue Fang Zhang ◽

Wan Jun Hao ◽

Bao Yi Li ◽

Yu Ping Duan ◽

Shun Hua Liu

Keyword(s):

Electromagnetic Wave ◽

Carbon Black ◽

High Performance ◽

Expanded Polystyrene ◽

Cement Composites ◽

Frequency Range ◽

Electromagnetic Wave Absorption ◽

Matching Layer ◽

Layer Composite ◽

New Material

This paper reported that, using the method of double layer composite successfully prepared high performance of electromagnetic wave absorption materials. Such a composite is composed of a cement matching layer filled with expanded polystyrene (EPS) beads and an absorbing cement layer made of EPS beads and carbon black. The samples were tested by arching method in the frequency range of 8~18GHz. The reflectivities were revealed to be excellent, the lowest being-17dB. The new material can be used for building indoor electromagnetic radiation protection.

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