Abstract
The electromagnetic shielding characteristics according to the material composition of foamed concrete, which was manufactured to reduce environmental pollution and to economically apply it in actual building walls, were researched herein. Industrial by-products such as ladle furnace slag (LFS), gypsum, and blast furnace slag (BFS) were added to manufacture foamed concrete with enhanced functionalities such as lightweight, heat insulation, and sound insulation. The electrical characteristics such as permittivity and loss tangent according to the foam and BFS content were calculated and measured. Free space measurement was used to measure the electromagnetic shielding characteristics of the actually manufactured foamed concrete. It was confirmed that electromagnetic signals were better blocked when the foam content was low and the BFS content was high in the measured frequency bands (1–8 GHz) and that approximately 90% of the electromagnetic signals were blocked over 4 GHz.
Highlights
A number of users using a wireless service using a wireless communication system such as a wireless LAN and a Bluetooth in the 2.4 GHz/5 GHz band and a mobile communication system using the 3G and LTE are rapidly increasing
The mean permittivity at 1–8 GHz frequency bands decreased as the foam content increased to 20%, 40%, and 60% with values of approximately 5.24, 3.99, and 3.12 from Figure 3(a), respectively
The permittivity and loss tangent were measured by fixing the foam content to 40% in order to investigate electrical characteristics of foamed concreted according to the blast furnace slag (BFS) content
Summary
A number of users using a wireless service using a wireless communication system such as a wireless LAN and a Bluetooth in the 2.4 GHz/5 GHz band and a mobile communication system using the 3G and LTE are rapidly increasing. In order to improve the communication performance of the indoor space, it is becoming more important to analyze the electrical characteristics and electromagnetic wave transmission characteristics of the building materials constituting the building. Addition of BFS in concrete makes the material have large long-age strength, low hydration heat when water and cement react, and outstanding durability. It can reduce CO2 generation, reduce cement consumption because inexpensive industrial by-products are added in production, and lower manufacturing costs and it is used in foamed concrete, and in ordinary concrete [14, 15]. Using the measured electrical properties, the electromagnetic characteristics of echofriendly foamed concrete were simulated in the frequency range of 1∼8 GHz and the electromagnetic transmission characteristics were measured and analyzed using free space measurement method
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