Resumo

GRANADOS, Camilo; ROJAS, Herbert Enrique  e  SANTAMARIA, Francisco. Evaluation of electromagnetic shielding of concrete. Rev.EIA.Esc.Ing.Antioq [online]. 2020, vol.17, n.34, pp.20-31.  Epub 27-Ago-2021. ISSN 1794-1237.  https://doi.org/10.24050/reia.v17i34.1231.

This article analyzes the effectiveness of electromagnetic shielding of several concrete structures based on the variation of the thickness and the content or humidity level (NH), for a defined frequency range. The study is based on the implementation of simulations in two dimensions (2D) using a software based on the finite element method (FEM) and was developed from a set of values obtained from the application of mathematical models for dielectric media. Initially, the complex electrical properties (dielectric permittivity and conductivity) of the structures are characterized by applying the Jonscher mathematical model of three variables. Subsequently, these properties are evaluated in a specific frequency range. As a result, it is observed that the electromagnetic shielding offered by the concrete increases when the NH and the thickness of the structures are increased. Additionally, the evidence shows that energy losses due to absorption are greater compared to the other types of losses analyzed in the study.

Palavras-chave : Electromagnetic shielding; concrete; complex electrical properties; Jonscher model.

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