▎ 摘 要
Graphene oxide (GO) and magnetic gamma-Fe2O3 nanoparticles are added into ultra-high-performance concrete (UHPC) to prepare GO/gamma-Fe2O3-UHPC composite sheet for electromagnetic wave absorbing engineering material. The electromagnetic wave absorption performance of the UHPC composite sheet calculated matches the reflection value measured by the bow method quite well. The wave absorption effect is better when the frequency band is above 16 GHz. In the 18 GHz frequency band, the reflectivity reaches - 21.13 dB, indicating more than 99% of the electromagnetic wave can be absorbed. The wave absorption of the UHPC composite sheet is mainly owing to the electrical loss caused by the interface polarization of GO and the magnetic loss of gamma-Fe2O3.