What is it about?

Specific surface area is an important surface property of clays. Conventional methods have several limitations in the estimation. We proposed a simple and novel technique for the first time to estimate it by measuring clay volume in 0.1 N NaCl solution.

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Why is it important?

Specific surface area is one of the crucial surface properties of clay soils. The surface area is used as the surrogate compatibility index and is related to many engineering properties of the clays. Accurate estimation of the surface area, Sa, is essential for predicting the saturated – unsaturated characteristics of clays in engineering applications. The utilization of water as the probe molecule in the proposed method ensured greater accessibility to the internal surface and accuracy in the estimation.


Writing this article was a great pleasure as it has the co-author, Mr. Dhanesh Sing Das, with whom I have had a long-standing collaboration. It took a long time to develop this article with the co-author. It involves good analytical modeling and careful experimentation, and I hope you find this article useful and thought-provoking.

Venkata Bharat Tadikonda
Indian Institute of Technology Guwahati

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This page is a summary of: Specific Surface Area of Plastic Clays from Equilibrium Sediment Volume under Salt Environment, Geotechnical Testing Journal, March 2021, ASTM International, DOI: 10.1520/gtj20200190.
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