Electromagnetic properties of multi-layer graphenes filled cementitious composites

In this paper, different contents of multi-layer graphenes (MLGs) were separately incorporated into cement pastes and cement mortars to study the electromagnetic shielding and absorbing properties of MLGs filled cementitious composites in the frequency range of 2–18 GHz. In order to verify the reliability of using testing electromagnetic parameters to calculate electromagnetic shielding and absorbing properties, the measured absorbing reflectivity of cementitious composites containing MLGs were compared with the calculated values. The influence mechanisms of MLGs on the electromagnetic properties of cementitious composites were also investigated. Results indicate that the electromagnetic shielding effectiveness and absolute reflectivity value of cement pastes with 10.0% MLGs achieve a maximum of 10.35 dB and 33 dB, respectively. Besides, cement mortars with 15.0% MLGs show the greatest increase of 95% in the electromagnetic shielding effectiveness, and the absolute reflectivity value reaches up to 18 dB, which is 9 times as high as cement mortars without MLGs. Generally, MLGs filled cement pastes perform better in electromagnetic properties than MLGs filler cement mortars. The electromagnetic wave absorption loss of cementitious composites filled MLGs is governed by dielectric loss, and there is basically no magnetic loss.