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Abstract <p>The article presents the results of the physical clay fraction (&lt;0.01 mm) content estimation in 38&#xa0;soil samples using dielectric mixture formulas. The method is based on the difference in permittivity of large particles—quartz sand and feldspars—and small particles represented mainly by clay minerals. To measure the complex permittivity of air-dry samples at frequencies of 1.25–1.5 GHz, a half-wave resonator and vector network analyzers were used. The soil was considered a three-phase medium containing air, sand with feldspars, and clay. The dielectric permittivities of sand and clays such as bentonite, kaolin, muscovite, and vermiculite were measured in advance. The following values of the real part of the permittivity were found: montmorillonite, 8.3 ± 0.5; kaolinite, 11.2 ± 0.4; vermiculite, 8.7 ± 0.7; muscovite, 6.8 ± 0.3; and river sand, 4.57 ± 0.06. To assess the clay content in soils, the average values of 8.65 for clay and 4.86 for the coarse-grained fraction were used. The content of clay fraction was estimated using the formula for the permittivity of two-phase mixtures. First, the permittivity of the solid phase of the soil was determined, and then the solid phase was considered as a mixture of the coarse-grained fraction (&gt;0.01 mm) and clay (&lt;0.01 mm). We compared the measured values with the content of the physical clay (&lt;0.01 mm) measured by the sedimentation method. The square of the correlation coefficient of the values found using ZNB20 with those measured by sedimentation was 0.83, the average deviation was 16% with a maximum deviation of 160% for one soil sample with a low clay content.</p>

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Assessment of the Clay Fraction Content in Dry Soils Using the Resonator Method

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • P. P. Bobrov,
  • Yu. A. Kostychov,
  • O. V. Rodionova

摘要

Abstract

The article presents the results of the physical clay fraction (<0.01 mm) content estimation in 38 soil samples using dielectric mixture formulas. The method is based on the difference in permittivity of large particles—quartz sand and feldspars—and small particles represented mainly by clay minerals. To measure the complex permittivity of air-dry samples at frequencies of 1.25–1.5 GHz, a half-wave resonator and vector network analyzers were used. The soil was considered a three-phase medium containing air, sand with feldspars, and clay. The dielectric permittivities of sand and clays such as bentonite, kaolin, muscovite, and vermiculite were measured in advance. The following values of the real part of the permittivity were found: montmorillonite, 8.3 ± 0.5; kaolinite, 11.2 ± 0.4; vermiculite, 8.7 ± 0.7; muscovite, 6.8 ± 0.3; and river sand, 4.57 ± 0.06. To assess the clay content in soils, the average values of 8.65 for clay and 4.86 for the coarse-grained fraction were used. The content of clay fraction was estimated using the formula for the permittivity of two-phase mixtures. First, the permittivity of the solid phase of the soil was determined, and then the solid phase was considered as a mixture of the coarse-grained fraction (>0.01 mm) and clay (<0.01 mm). We compared the measured values with the content of the physical clay (<0.01 mm) measured by the sedimentation method. The square of the correlation coefficient of the values found using ZNB20 with those measured by sedimentation was 0.83, the average deviation was 16% with a maximum deviation of 160% for one soil sample with a low clay content.