THE PLASTIC LIMIT AS A BINARY PACKING PHENOMENON

The plastic limit data used in this report are the result of determinations on artificial soils which had been hydrated above the plastic limit for at least 24 hr. Four theoretical zones of behavior are defined from a two-component particle packing theory to account for variations in Atterberg's plastic limit of the artificial clay-silt-water systems as the weight fraction dry clay content (X) varies from 0 to 1. From X = 0 to X = 1 the experimental plastic limit successively approaches binary packing behaviors defined by 'zones' A, B, C, and D. Three constants, K the packing constant, Ka the angularity constant, and Kg the grading constant, of zone behavior are defined to account for the experimental deviation from the theoretical behavior. For the illite- and kaolin-silt-water systems, K = Ka + Kg. In zone A the clay is pictured as filling the voids formed by the silt fraction. In zone B a gradual expansion of the silt matrix takes place with increasing clay content. Zone C is defined for that range of X in which the experimental data are independent of X and approach a given relationship. Zone D represents the higher clay content portion of the system when the silt grains do not form a continuous matrix and the experimental data approach a given binary packing relationship.

Media Info

  • Pagination: 27 p.

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Filing Info

  • Accession Number: 00264426
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: RR-152 Intrm Rpt.
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM