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In-Situ Determination of Specific Surface Area of Clays

  • Jay N. Meegoda
  • Lucas Martin
Original Paper

Abstract

There are many methods to determine the specific surface area (SSA) of clay minerals. Some of these methods lack accuracy and some are time consuming. There are no methods available for the determination of in situ SSA. In this paper a new approach to predict the SSA of clays is proposed, which has been verified in the laboratory. This method is based on the electrical properties of soils. In this paper the experimental set up and the estimation of specific surface area is presented on the basis of variation of the dielectric constant and the conductivity of the clay–water system when subjected to alternating current in the frequency range of 1–100 MHz. The dielectric constant and conductivity respond differently for different soils with varying surface area corresponding to their mineralogy. When dielectric constants and conductivity were measured for sandy soils, there were no effects with the change of input frequency. The electrical method can identify clays and separate them from fine grained silts. Data are presented which shows a linear correlation between the magnitude of dielectric dispersion and SSA for various clay mixtures. The clay structure determines the value of in situ dielectric dispersion of the clay (Δεo) and hence the SSA, making this a good in situ method to estimate SSA of clays.

Keywords

In-situ Specific surface area Clay minerals Dielectric dispersion Dielectric constant Conductivity 

Notes

Acknowledgements

The authors would like to acknowledge late Dr. Kandiah Arulanandan. The bulk of the work was performed by the first author during his doctoral research under the guidance of Dr. Arulanandan at the University of California Davis. That work was then supplemented with additional data for publication at the New Jersey Institute of Technology.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of Civil and Environmental Engineering, New Jersey Institute of TechnologyUniversity HeightsNewarkUSA

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