Electromagnetic Protection Performance of Steel Wire Mesh Reinforced Composite Graphene-Ferrite Cement Mortar

WEI Shengbin; XIE Jianbin; GUAN Hongtao; WANG Dafu; GUO Zaibin

doi:10.3969/j.issn.1007-9629.2023.12.001

Abstract：The electromagnetic wave absorption performance of steel wire mesh reinforced composite graphene(GR)-manganese-zinc ferrite(MFO)cement mortar(referred to as composite mortar)was investigated at 1-18 GHz through macroscopic performance tests,microstructural tests,and numerical simulations to reveal its electromagnetic wave protection mechanism.The results show that 30.00％of MFO reduces the strength of composite mortar due to the dilution effect caused by agglomeration,while GR increases the strength of composite mortar by promoting cement hydration.Combined with the electromagnetic parameter tests of the materials and numerical simulation of mortar electromagnetic wave absorption performance by the time-domain finite-difference method,it can be seen that the steel wire mesh reinforced composite mortar with compound doping of GR and MFO has the optimal electromagnetic wave absorption,and there exists an optimal matching layer thickness.When the total thickness of mortar is 25 mm,the wire mesh reinforced mortar doped with 0.10％GR and 30.00％MFO has an effective electromagnetic wave absorption of less than-10.00 dB,with an absorption bandwidth of 1.68-4.34 GHz and an electromagnetic reflection loss of-22.13 dB for the electromagnetic wave of 3.23 GHz.The reflection loss of 3.23 GHz can reach-22.13 dB.Because MFO has good magnetic loss properties,GR has good dielectric loss properties,and cement mortar has excellent reflection properties of porous materials,the combination of the three can become an electromagnetic wave absorbing material with building functions.