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以钢渣复合水泥作为胶凝基体,掺入低介电常数的多孔无机材料改善基体的表面波阻抗和内部电磁波传输通道,制备出新型水泥基复合吸波材料。试验研究了钢渣改性水泥电磁参数及反射率的变化,膨胀珍珠岩掺量变化对水泥基复合材料吸波性能的影响。结果表明:当掺入30%钢渣微粉,膨胀珍珠岩掺量在50%,厚度为20mm时,在4～8GHz频段范围内最小反射率达-26.9dB,小于-10dB的频带宽度达2GHz;在8～18GHz范围内反射率均小于-9dB,最小吸收峰值为-10.4dB,材料呈现出较好的吸波性能。膨胀珍珠岩的掺量存在一个最佳值,理想范围在50%～60%之间。
A new type of cement-based composite absorber was prepared by using steel slag composite cement as the gelling matrix and incorporating porous inorganic materials with low dielectric constant to improve the surface wave impedance and the internal electromagnetic wave propagation path of the matrix. The influence of the change of the volume fraction of expanded perlite on the microwave absorbing properties of cementitious composites was studied experimentally. The results show that the minimum reflectance of -26.9dB and the frequency bandwidth of less than -10dB in the range of 4 ~ 8GHz are up to 2GHz when doped with 30% steel slag powder and expanded perlite content is 50% and the thickness is 20mm. Reflectance is less than -9dB in the range of 8 ~ 18GHz, the minimum absorption peak is -10.4dB, the material shows better absorbing performance. There is an optimal value for the amount of expanded perlite, ideally in the range of 50% to 60%.