Naslov
Electromagnetic wave transmission through a concrete sandwich plate with the addition of multi-walled carbon nanotubes

Autori
Mandrić, Vanja ; Miličević, Ivana ; Rupčić, Slavko ; Vrdoljak, Ivan ; Baxhaku, Ismail ; Čolak, Stanko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
PROCEEDINGS - ICMECE 2022 / Kurt, Erol - Ankara/Turkey : Published by Erol Kurt, 2022

ISBN
978-605-70842-1-7

Skup
The Interdisciplinary Conference on Mechanics, Computers and Electrics (ICMECE 2022) 6-7 October 2022, Barcelona, Spain

Mjesto i datum
Barcelona, Španjolska, 06.10.2022. - 07.10.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
multiwalled carbon nanotubes (MWCNT), electromagnetic wave transmission, electric field, transmission parameter, shielding efficiency, concrete sandwich plate

Sažetak
This paper deals with electromagnetic field transmission through concrete and concrete composites in the frequency range from 30 MHz to 18 GHz. The paper presents the measurement of the transmission parameter S21 through pure concrete, through a concrete plate with the addition of multiwalled carbon nanotubes (MWCNT) and through a two-layer structure made of the concrete plate (three different thicknesses: 100, 200 and 300 mm) and concrete plate with the addition of carbon nanotubes. MWCNT plate is made as a 50 mm thick concrete-based composite with carbon nanotubes (3% of the cement mass ; or 9 kg/m3 of concrete) additive. This addition to the concrete significantly reduced the electric field level of the EM wave propagated through the composite. This is supported by the result that samples with a two-layer concrete - MWCNT composite structure have a lower transmission of the electric field for the entire measured frequency range. This transmission is shown by the maximum values of the difference between the transmission coefficient of the S21 MWCNT composite (as a reference value) and the two-layer structure concrete - MWCNT composite and amounts to: a) from 30 MHz to 1 GHz ΔS21max= 37.1 dB at the frequency of 838 MHz and b)from 1 GHz to 18 GHz ΔS21max= 34.0 dB at a frequency of 4.6 GHz for a two-layer sandwich sample made with a 300 mm concrete plate. These results are listed and shown with the reference value of the transmission coefficient for the MWCNT plate. The difference in coefficients is even more significant if clean concrete slabs are used as reference values of reflection coefficients. The aim of this research is to determine the possibility of reducing the transmission of EM waves by covering existing concrete buildings with MWCNT plates.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Građevinarstvo

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