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ASTM D4647

2006 Edition, November 1, 2006

Complete Document

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

Includes all amendments and changes through Editorial Change 1, September 2009

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Superseded By: ASTM D4647/D4647M

Additional Comments:
W/D S/S BY ASTM D4647/D4647M
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Product Details:

  • Revision: 2006 Edition, November 1, 2006
  • Published Date: September 2009
  • Status: Superseded By:
  • Superseded By: ASTM D4647/D4647M
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 11
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

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 D 4221.

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 (1).2

Three alternative procedures for classifying the dispersibility of clay soils are provided as follows:

Method A and Method C, adapted from Ref (1), classify soils into six categories of dispersiveness as: dispersibility (D1, D2), slight to moderately dispersive (ND4, ND3), and nondispersive (ND2, ND1).

Method B classifies soils into three categories of dispersiveness as: dispersibility (D), slightly dispersive (SD), and nondispersive (ND). 

The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only. 

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

*A Summary of Changes section appears at the end of this standard.

2 The boldface numbers in parentheses refer to the list of references at the end of this test method.