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<p>This article explores in depth the influence of modified ferrite on the properties of cement-based composite materials, especially its absorption performance. In the unmodified state, the electromagnetic wave reflectivity of pure cement samples is relatively high, with a peak reflectivity of around − 8.4&#xa0;dB, and cannot effectively absorb electromagnetic waves in the frequency range of 2–18&#xa0;GHz, resulting in a narrow effective bandwidth and limited absorption performance. In order to improve this situation, this article modifies ferrite with sodium dodecyl sulfonate and incorporates it into cement-based materials. The research results show that with the increase of modified ferrite content, the compressive strength and flexural strength of cement-based composite materials gradually decrease. However, when the content is 20%, its electromagnetic wave reflectivity significantly decreases, with the lowest reflectivity reaching − 13.79&#xa0;dB, and the effective bandwidth in the 2–18&#xa0;GHz frequency band reaching 14&#xa0;GHz, which is significantly improved compared to unmodified samples. In addition, the introduction of modified ferrite also increases the number of electric dipoles inside the cement-based material, improving the dielectric loss ability, but has little effect on the magnetic loss ability. Through XRD and SEM analysis, it was found that ferrite did not undergo chemical reactions with cement components, but adhered to the cement-based surface in a spherical shape, significantly affecting the hydration products and microstructure of cement, forming a good electromagnetic wave absorption structure.</p>

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The influence of modified ferrite on the absorption performance of cement-based materials

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Yao Li,
  • Muzhi Du,
  • Luantao Li,
  • Baodong Cui

摘要

This article explores in depth the influence of modified ferrite on the properties of cement-based composite materials, especially its absorption performance. In the unmodified state, the electromagnetic wave reflectivity of pure cement samples is relatively high, with a peak reflectivity of around − 8.4 dB, and cannot effectively absorb electromagnetic waves in the frequency range of 2–18 GHz, resulting in a narrow effective bandwidth and limited absorption performance. In order to improve this situation, this article modifies ferrite with sodium dodecyl sulfonate and incorporates it into cement-based materials. The research results show that with the increase of modified ferrite content, the compressive strength and flexural strength of cement-based composite materials gradually decrease. However, when the content is 20%, its electromagnetic wave reflectivity significantly decreases, with the lowest reflectivity reaching − 13.79 dB, and the effective bandwidth in the 2–18 GHz frequency band reaching 14 GHz, which is significantly improved compared to unmodified samples. In addition, the introduction of modified ferrite also increases the number of electric dipoles inside the cement-based material, improving the dielectric loss ability, but has little effect on the magnetic loss ability. Through XRD and SEM analysis, it was found that ferrite did not undergo chemical reactions with cement components, but adhered to the cement-based surface in a spherical shape, significantly affecting the hydration products and microstructure of cement, forming a good electromagnetic wave absorption structure.