Towards a better understanding of the moisture - density - strength relationship of compacted soil
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Savage, P.F.
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Document Transformation Technologies
Abstract
Paper presented at the 31st Annual Southern African Transport Conference 9-12 July 2012 "Getting Southern Africa to Work", CSIR International Convention Centre, Pretoria, South Africa.
The moisture-density (MDD) graph can be replaced by the voids ratio-water ratio graph (ER graph) which is a more suitable indicator of soil strength. The voids ratio E, and the water ratio R, are ratios of volume and are the true parameters of a soil’s strength, being independent of mass. Mathematical equations for the E-R and MDD curves are developed enabling the peak condition of strength to be obtained from only one M/D test if the soil’s particle relative density is known. Compression strength (resistance to further densification) and CBR strength (resistance to particle dislocation) are related and the insitu and soaked CBR for a compacted soil layer can be assessed by graphical or mathematical means.
The moisture-density (MDD) graph can be replaced by the voids ratio-water ratio graph (ER graph) which is a more suitable indicator of soil strength. The voids ratio E, and the water ratio R, are ratios of volume and are the true parameters of a soil’s strength, being independent of mass. Mathematical equations for the E-R and MDD curves are developed enabling the peak condition of strength to be obtained from only one M/D test if the soil’s particle relative density is known. Compression strength (resistance to further densification) and CBR strength (resistance to particle dislocation) are related and the insitu and soaked CBR for a compacted soil layer can be assessed by graphical or mathematical means.
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This paper was transferred from the original CD ROM created for this conference. The material was published using Adobe Acrobat 10.1.0 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: nigel@doctech URL: http://www.doctech.co.za
Keywords
Moisture-density (MDD) graph, Voids ratio-water ratio graph (ER graph), Soil strength