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<p>The present study investigates the influence mechanisms of glass powder (GP) particle size and carbon fiber (CF) modification on the mechanical strength, pore structure, and electromagnetic wave (EMW) absorption performance of foamed cement composites. Utilizing CF as the EMW absorber and employing GP with varying particle sizes to modulate dielectric properties, foamed cement-based EMW-absorbing materials were synthesized, and the performance relationship between GP particle size and the X-/Ku-bands was established. The findings indicate that the synergistic effect of 38-μm GP and 0.4% CF significantly enhances the compactness and mechanical strength of the foamed cement-based EMW-absorbing materials. The compressive and flexural strengths of the composite material have been determined to be 2.98&#xa0;MPa and 1.95&#xa0;MPa, respectively. The combined action of GP and CF results in the refinement of the pore size and the regulation of the pore size distribution, thereby achieving a maximum porosity of up to 73.41% and a minimum average pore size as low as 182.16&#xa0;μm. Furthermore, it has been demonstrated that the use of 48-μm GP in conjunction with 0.4% CF results in a significant enhancement of the dielectric properties and EMW absorption capacity. The composite material exhibits an optimal reflection loss (RL) of − 16.35&#xa0;dB at 10.42&#xa0;GHz with a thickness of 2.9&#xa0;mm, and the effective absorption bandwidth (EAB) extends up to 2.98&#xa0;GHz. The present study provides a theoretical foundation and a methodological framework for determining the absorption frequency bands and selecting the most appropriate GP particle size in the development of foamed cement-based EMW-absorbing materials.</p>

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Study on the Regulation Mechanism of Glass Powder Particle Size and Carbon Fiber Modification on Electromagnetic Properties of Foamed Concrete

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Ying-hua Bai,
  • Xian-ke Li,
  • Hao Xin

摘要

The present study investigates the influence mechanisms of glass powder (GP) particle size and carbon fiber (CF) modification on the mechanical strength, pore structure, and electromagnetic wave (EMW) absorption performance of foamed cement composites. Utilizing CF as the EMW absorber and employing GP with varying particle sizes to modulate dielectric properties, foamed cement-based EMW-absorbing materials were synthesized, and the performance relationship between GP particle size and the X-/Ku-bands was established. The findings indicate that the synergistic effect of 38-μm GP and 0.4% CF significantly enhances the compactness and mechanical strength of the foamed cement-based EMW-absorbing materials. The compressive and flexural strengths of the composite material have been determined to be 2.98 MPa and 1.95 MPa, respectively. The combined action of GP and CF results in the refinement of the pore size and the regulation of the pore size distribution, thereby achieving a maximum porosity of up to 73.41% and a minimum average pore size as low as 182.16 μm. Furthermore, it has been demonstrated that the use of 48-μm GP in conjunction with 0.4% CF results in a significant enhancement of the dielectric properties and EMW absorption capacity. The composite material exhibits an optimal reflection loss (RL) of − 16.35 dB at 10.42 GHz with a thickness of 2.9 mm, and the effective absorption bandwidth (EAB) extends up to 2.98 GHz. The present study provides a theoretical foundation and a methodological framework for determining the absorption frequency bands and selecting the most appropriate GP particle size in the development of foamed cement-based EMW-absorbing materials.