Abstract
Effective electromagnetic interference shielding has become a focal point of concern for special construction and buildings. In this study, a novel cement-based electromagnetic shielding composite material was developed by the incorporation of both nickel-iron alloy powder (NF) and the partial replacement of the fine sand portion of ISO standard sand with iron ore tailings (IOTs). Experimental results indicate that the electromagnetic shielding performance of the cement/IOTs composites was improved with the increasing NF content at frequencies ranging from 8.2 to 12.4 GHz (X-band) while their mechanical properties changed little. With the incorporation of 5 % NF in the cement mortar, a maximum of 22.17 dB at 12.4 GHz could be achieved. Further analysis of the shielding mechanism of this composite material reveals that the enhancement of its electromagnetic shielding efficiency mainly results from the absorption loss rather than reflection loss.
Published Version
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