Reflection and transmission performances of concrete slabs mixed with reduced iron powder

We studied the reflection and transmission performance by controlling the thickness of the concrete slabs and the mixing amount of reduced iron powder and introducing wire netting into the concrete slabs. We used a bow-frame for the test of reflectivity and a two-port method for the test of transmission attenuation. The frequency band of the reflectivity ranges from 2 to 18 GHz. The frequency band of the transmission's measurement ranges from 12 to 18 GHz. The reflectivity of different concrete slabs is around -5 dB. When the mixing amount of reduced iron power in concrete slabs is above 200 kg/m³, the transmission attenuation can reach -50 dB. By analyzing experimental results, we can find that the concrete slabs' thickness, the mixing amount of reduced iron powder and the wire netting have heavy effect on transmission attenuation, but little effect on reflectivity. (authors)