Talk:Plasticity index

If the plasticity index is used for more than just soils, we can certainly change the article to reflect that, however, I'd like to know of a reference for that.

Convention (or perhaps a sort-of common knowledge) is that PI is for soils including clays and silts (actually, according to ASTM, any material passing the No. 40 sieve).

Thanks, Zue

hello,                                                                                                     i need notes on the tests to be taken in clay, and also the properties of clay.