Abstract
A rolling device was developed in order to obtain plastic limits in a more expeditious and uniform fashion. The device enables the operator to perform the test on four to five specimens simultaneously. It also dictates that the very strict specification for rolling the soil threads into diameters of 3.2 ± 0.5 mm (0.125 ± 0.020 in.) is met. It removes all subjectivity from the plastic limit determination by governing the diameter of the threads as well as removing any error that may be introduced due to the uniqueness of the human hand. The design and operation of the device are detailed in this paper.
Issue Section:
Technical Notes
References
1.
AASHTO
1990
, “Determining the Plastic Limit and Plasticity Index of Soils
,” Standard Specifications for Transportation Materials and Methods of Sampling and Testing
, Part II, American Association of State Highway and Transportation Officials
, pp. 208
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.2.
ASTM
, 1991
, Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils, (D 4318-84)
, Annual Book of ASTM Standards
, Vol. 04.08
, American Society for Testing and Materials
, Philadelphia
, pp. 608
-618
.3.
Dunn
, I. S.
, et al 1980
, “Fundamentals of Geotechnical Analysis
,” John Wiley & Sons
, New York
.
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