Abstract: In order to further enhance the wave-absorbing performance of electromagnetic wave-absorbing aggregate concrete and overcome the limitation of single-fiber-component for functional enhancement of concrete, the reflectivity tests of electromagnetic wave absorbing aggregate concrete with mixed fiber components at different fiber mixing amounts were carried out by the bow method, which were based on carbon fiber (CF), basalt fiber (BF) and polypropylene fiber (PF). The research results indicate that the mixed fiber components can better enhance the wave absorbing performance of electromagnetic wave absorbing aggregate concrete and broaden the effective wave absorbing bandwidth than single-fiber component does. CF mixed with BF or PF at low dosage has better wave absorbing enhancement effect, but it is not suitable to mix more CF when the total amount of fibers is too high. After mixing addition of BF and PF, the overall wave absorbing performance is the best, and the reflectivity of each component sample can be basically less than -7 dB in the whole frequency band. With the two ratios of 0.2% PF/0.2% BF or 0.2% PF/0.6% BF, the specimen can be less than -8 dB in the whole frequency band, among which, the effective bandwidth less than -10 dB is most up to 4.00 GHz.

Key words: architectural engineering; mixed fiber; electromagnetic wave absorbing aggregate concrete; bow method; wave absorption

摘要： 为进一步提升电磁吸波集料混凝土的吸波性能，克服单一纤维组分对混凝土功能增强的局限性，以碳纤维(CF)、玄武岩纤维(BF)和聚丙烯纤维(PF)为基础，对不同纤维掺入量的混杂纤维组分电磁吸波集料混凝土进行了弓形法反射率试验。研究结果表明：混杂纤维组分较单纤维组分能更好地提升电磁吸波集料混凝土的吸波性能，拓宽了有效吸波带宽；CF与BF或PF在低掺量下混合，吸波的增强效果较好，但当纤维总量过高时不宜掺入较多的CF；BF和PF混合掺入后整体吸波性能最好，各组分试样反射率基本可全频段小于-7 dB，0.2%PF/0.2%BF或0.2%PF/0.6%BF这两个配比下的试样可全频段小于-8 dB，其中小于-10 dB的有效带宽最多可达4.00 GHz。

关键词: 建筑工程；混杂纤维；电磁吸波集料混凝土；弓形法；吸波性能