What is the best method to measure swelling of clays and also dispersion of colloids in a soil subjected to sodic conditions ?

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Hamed Khodadadi T.

Dear Louadj,

you can look at the standard test methods directly measuring swelling potential of expansive soils like ASTM D4546. You can also indirectly estimate it through finding liquid limit (LL) and plastic limit (PL) of your soil.

I M Saman K Ilankoon

Regarding dispersion of colloids in porous media: novel methods are UV fluorescence (number of articles), Positron emission particle tracking (please see http://www.sciencedirect.com/science/article/pii/S0009250912006598)