Prediction of Interlayer Swelling of Clays in Mixed-Salt Solutions1
- B. L. McNeal2
A comparison has been made of the relative interlayer swelling values predicted from two different ion-distribution models for mixed Na-, Ca-clays. When interlayer swelling predicted from a demixed-ion model is plotted as a function of exchangeable-sodium-percentage (ESP) at constant salt concentration, a series of straight lines having increasing slopes and decreasing ESP-axis intercepts with decreasing salt concentration is obtained. Similar plots involving a diffuse double-layer (mixed-ion) model produce a series of hyperbolas having concentration-dependent intercepts on the swelling, rather than the ESP, axis. Most of the limited data available from the literature on soil and clay swelling in mixed-salt solutions agree more closely with predictions from the demixed-ion model, though neither model is fit exactly. Implications and limitations of each swelling model are discussed.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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