Study on mechanism of electromagnetic shielding effectiveness of carbon nanofibers reinforced cement concrete

Abstract

In this paper, five groups of cement concrete specimens reinforced by carbon nanofibers (CNFs) were prepared with different fiber content of 0%, 0.1%, 0.2%, 0.3% and 0.5%, the electromagnetic shielding effectiveness (SE) and the mechanism of shielding were analyzed. The results show that, when the frequency of electromagnetic wave is higher than 2 GHz, with the increase of frequency, the improvement gradually increases; When the frequency is 18 GHz, the SE reaches the maximum; CNFs can improve the SE of concrete material by improving its conductivity and the loss of electromagnetic wave.