Paper presented at the 26th Annual Southern African Transport Conference 9 - 12 July 2007 "The challenges of implementing policy?", CSIR International Convention Centre, Pretoria, South Africa. ABSTRACT:A study of the Atterberg Limits of different clays has shown that the ratio of Liquid limit to Plastic limit defines the type of clay present in a soil. This ratio R (or plasticity ratio) is shown to be related exponentially to Skempton’s Activity. The clay fraction within a given soil can now be estimated without any hydrometer analysis. Van der Merwe’s zones of swell potential have been mathematically defined and a chart giving the swell potential of a soil from the value of R and P425 fraction is presented.
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