A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Electromagnetic wave absorbing characteristics of carbon black cement-based composites
AbstractElectrical resistivity, compressive strength, and the electromagnetic absorbing effectiveness of carbon black (CB) cement-based composites (CBCC) with different contents of high-structure CB were studied in this paper. The results indicate that the resistivity of CBCC versus the concentration of CB curves has typical features of percolation phenomena: CBCC in the percolation threshold zone contains 0.36–1.34vol.% of CB. Thus, the conductive network can be formed in CBCC by using small amount of high-structure CB. Compressive strength of CBCC decreases with CB content increasing. Especially, compressive strength decreases substantially when CB content is more than 3.0wt.%. CBCC exhibits good performance of absorbing electromagnetic waves in the frequency range of 8–26.5GHz. For CBCC containing 2.5wt.% of CB, the minimum reflectivity reaches −20.30dB. The frequency bandwidth in which the reflectivity is less than −10dB was from 14.9GHz to 26.5GHz. The filling of CB has improved the dielectric constant and the loss factor of the cement material remarkably. The loss factor of CBCC increases with the CB content increasing.
Electromagnetic wave absorbing characteristics of carbon black cement-based composites
AbstractElectrical resistivity, compressive strength, and the electromagnetic absorbing effectiveness of carbon black (CB) cement-based composites (CBCC) with different contents of high-structure CB were studied in this paper. The results indicate that the resistivity of CBCC versus the concentration of CB curves has typical features of percolation phenomena: CBCC in the percolation threshold zone contains 0.36–1.34vol.% of CB. Thus, the conductive network can be formed in CBCC by using small amount of high-structure CB. Compressive strength of CBCC decreases with CB content increasing. Especially, compressive strength decreases substantially when CB content is more than 3.0wt.%. CBCC exhibits good performance of absorbing electromagnetic waves in the frequency range of 8–26.5GHz. For CBCC containing 2.5wt.% of CB, the minimum reflectivity reaches −20.30dB. The frequency bandwidth in which the reflectivity is less than −10dB was from 14.9GHz to 26.5GHz. The filling of CB has improved the dielectric constant and the loss factor of the cement material remarkably. The loss factor of CBCC increases with the CB content increasing.
Electromagnetic wave absorbing characteristics of carbon black cement-based composites
Dai, Yawen (author) / Sun, Mingqing (author) / Liu, Chenguo (author) / Li, Zhuoqiu (author)
Cement and Concrete Composites ; 32 ; 508-513
2010-03-27
6 pages
Article (Journal)
Electronic Resource
English
Electromagnetic wave absorbing characteristics of carbon black cement-based composites
| Online Contents | 2010
Electromagnetic wave absorbing properties of multi-walled carbon nanotube/cement composites
| Online Contents | 2013
Electromagnetic wave absorbing properties of multi-walled carbon nanotube/cement composites
| British Library Online Contents | 2013