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Title: The plastic limit as a binary packing phenomenon
Authors: Washington University (Saint Louis, Mo.). Dept. of Earth Sciences.
Ballard, Geoffrey E. H. (Geoffrey Edwin Hall), 1932-2008
Keywords: Soils
Soil plasticity
Plastic properties
Soil mechanics
Soil properties
Mathematical analysis
Mathematical models
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 152.
Description: Research Report
Summary: 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 constant, 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.
Appears in Collections:CRREL Research Report

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