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.
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: email@example.com URL: http://www.doctech.co.za