nanobuild-3-2015-pages-43-59

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THE RESULTS OF THE SPECIALISTS’ AND SCIENTISTS’ RESEARCHES

Pages:   43-59

UDC 666.974; 661.666.4

The carbonaceous concrete based on sawdust

Authors: BELOUSOVA Elena Sergeevna, Post-graduate student of the Department of «Information Security» Belarussian State University of Informatics and Radioelectronics, Minsk, Belarus; L.Bedy, 2b, hostel № 3, room 135b, Minsk, Belarus, 220040, elena1belousova@gmail.com;

LYNKOV Leonid Mihailovich, Doctor of Engineering, Professor, Head of the Department «Information Security» Belarussian State University of Informatics and Radioelectronics, Minsk,

Belarus; Independence Avenue, 157–197, Minsk, Belarus, 220114, leonid@bsuir.by;

Abdolsalam Meftah MOHAMED Abulgasim, Post-graduate student of the Department of «Information Security» Belarussian State University of Informatics and Radioelectronics, Minsk, Belarus; Parnikovaja st., 11–77, Minsk, Belarus, 220114, a.slam78@yahoo.com

Extended Abstract: Today there are many requirements for strength, ecology and economy of

produced concretes. The authors of the paper study attenuation of electromagnetic radiation of carbonaceous powders in the concrete composition. Carbon black was selected as a carbon powder for addition in concrete composition. Carbon black is a nanomaterial with disoriented structure of particles (average size is about 50 nm). The composition of the carbon black contains at least 90 wt.% amorphous carbon, more than 5 wt. % chemisorbed oxygen and about 4 wt.% of impurities. Materials with the addition of carbon black have electrical conductivity due to the high content of carbon. These materials are able to absorb electromagnetic radiation. For cement composition with addition of carbon black (more than 30 wt. %) and water transmission coefficient of electromagnetic radiation is about –10 dB, for cement composition with 20 wt. % of carbon black the reflection coefficient is –8 dB in the frequency range 8–12 GHz. The concretes with a saturated aqueous solution of calcium chloride and 10% of carbon black possess minimal reflection coefficient (–14… –8 dB). Electromagnetic radiation shielding of concrete with the addition of sawdust was investigated. The concrete with sawdust (40 wt. %) impregnated with an aqueous solution with carbon black has the reflection coefficient less than –8 dB and transmission coefficient –40 dB in the frequency range 8–12 GHz. These concretes can be used for creation of a shielded room with the technical equipment for information processing to prevent data leakage through the compromising emanations and crosstalk.

Key words: calcium chloride solution, carbon black, concrete, electromagnetic radiation transmission coefficient, reflection coefficient of electromagnetic radiation, sawdust.

DOI: dx.doi.org/10.15828/2075-8545-2015-7-3-43-59

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