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Test Method Title

Standard Test Method for Identification and Classification of Dispersive Clay Soils by the Pinhole Test

Reference Number

ASTM D4647

Material

Soil

Test Property

Dispersive classification

Description of Test

This test method presents a direct, qualitative measurement of the dispersibility and consequent colloidal erodibility of clay soils by causing water to flow through a small hole punched in a specimen. This test method is complemented by Test Method D4221. This test method and the criteria for evaluating test data are based upon results of several hundred tests on samples collected from embankments, channels, and other areas where clay soils have eroded or resisted erosion in nature. This test method is not applicable to soils with less than 12% fraction finer than 5mm and with a plasticity index less than or equal to 4.

Preferred Test Sample Size

1 drillers jar

Number of Test Specimens

1

Test Specimen Size

2.87 in diameter x 1.5 in height

Keywords

Clay, colloidal erodibility, dispersibility, dispersion, dispersive clays, erosion, pinhole

For more information, contact GeoTesting Express:



Atlanta

770.645.6575


Boston

978.635.0424


Chicago

224.676.1371


New York

212.566.6630



info@geotesting.com

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