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首页> 外文期刊>Science and Engineering of Composite Materials >Microwave absorption and mechanical properties of double-layer cement-based composites containing different replacement levels of fly ash
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Microwave absorption and mechanical properties of double-layer cement-based composites containing different replacement levels of fly ash

机译：粉煤灰替代含量不同的双层水泥基复合材料的微波吸收和力学性能

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摘要

Double-layer absorbing cement-based composites with the thickness of 10 mm were prepared, including different replacement levels of fly ash (FA) in the absorbing layer as well as the matching layer for impedance matching. Waste polyethylene terephthalate bottle fragment was introduced as electromagnetic transparent reinforcement aggregate. Carbon black was used to be original absorbent in the absorbing layer. The microstructure and electromagnetic parameters of FA were closely looked at through scanning electron microscope, X-ray diffraction, and analyzer of vector network. The absorption and mechanical properties of cement-based composites were tested. It turned out that when the optimal replacement ratio of FA in the absorbing layer and matching layer gets to 50%:30%, the minimum value of reflection loss achieves ?22.3 dB at 13.2 GHz; also, the value of absorption bandwidth that is effective (&?8 dB) is 6.4 GHz. Ni-Zn ferrite proves to be a feasible absorbent that is additional for the matching layer compared to what is added to the absorbing layer. The compressive strength of all the mixtures decreased, while the flexural strength decreased first and then increased with the rise of the FA replacement level.
机译：制备了厚度为10 mm的双层吸收水泥基复合材料，包括在吸收层以及用于阻抗匹配的匹配层中不同水平的粉煤灰（FA）替代水平。引入废聚对苯二甲酸乙二醇酯瓶碎片作为电磁透明增强骨料。炭黑被用作吸收层中的原始吸收剂。通过扫描电子显微镜，X射线衍射和矢量网络分析仪仔细观察了FA的微观结构和电磁参数。测试了水泥基复合材料的吸收性能和机械性能。结果表明，当吸收层和匹配层中FA的最佳置换率达到50％：30％时，反射损耗的最小值在13.2 GHz时达到？22.3 dB;同样，有效的吸收带宽（＜8dB）值为6.4GHz。事实证明，镍锌铁氧体是一种可行的吸收剂，与添加到吸收层中的吸收层相比，它是匹配层的附加吸收层。随着FA替代量的增加，所有混合物的抗压强度均下降，而抗弯强度则先下降，然后升高。

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