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Determination of the plasticity index from flow index

Sridharan, A and Nagaraj, HB and Prakash, K (1999) Determination of the plasticity index from flow index. In: Geotechnical Testing Journal, 22 (2). pp. 175-181.

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Abstract

The flow index (I-f), which is the slope of the water content versus log(10) (number of blows) plot in the percussion cup method or the slope of the water content versus log(10) (depth of penetration) plot of the cone penetration method of determining the liquid limit of soils is a measure of soil plasticity. Hence, the plasticity index of a soil that represents the soil plasticity can be correlated with the now index. Analysis of test data pertaining to soils of widely varying plasticity characteristics and geological origin indicates that there is an excellent correlation between the plasticity index and the flow index, particularly in the cone penetration method. In this paper, a simple equation has been suggested to obtain the plasticity index of a soil from the flow index, thereby eliminating the dependence of the plasticity index determination on the time-consuming and unrefined plastic limit test.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Society of Testing Materials.
Keywords: Atterberg limits;Clays;Plasticity;Laboratory tests;Soil classification.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 06 Mar 2009 09:17
Last Modified: 06 Mar 2009 09:17
URI: http://eprints.iisc.ernet.in/id/eprint/18389

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