ASTM D4221-17
Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer

Standard No.

ASTM D4221-17

Release Date

2017

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D4221-18

Latest

ASTM D4221-18

Scope

1.1 This test method provides an indication of the natural dispersive characteristics of clay soils by comparing the amount of particles finer than 2-µm as determined by this method compared to the amount of particles finer than 2-µm as determined by Test Method D7928(1).2 In order to do this comparison, two similar specimens must be obtained from the sample. 1.2 This test method follows the procedure given in Test Method D7928 with the exception that the soil slurry is not mechanically dispersed and no dispersing agent is added. 1.3 This test method is applicable only to soils where the position of the plasticity index versus liquid limit plots (Test Methods D4318) falls on or above the “A” line (Practice D2487) and more than 12 % of the soil fraction is finer than 2-µm as determined in accordance with Test Method D7928(2). 1.4 Since this test method may not identify all dispersive clay soils, other tests such as, pinhole dispersion (Test Methods D4647/D4647M), crumb (Test Methods D6572) (3-5) and the analysis of pore water extraction (Test Methods D4542) (4-7) may be performed individually or used together to help verify dispersion. 1.5 Units—The values stated in SI units are to be regarded as the standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.6.1 The procedures used to specify how data are collected/ recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. 1.7 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, health and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D4221-17 Referenced Document

• ASTM D2216 Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
• ASTM D2487 Standard Test Method for Classification Of Soils For Engineering Purposes
• ASTM D2488 Recommended Practice for Description Of Soils (Visual-Manual Procedure)
• ASTM D3740 Standard Practice for Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
• ASTM D4220/D4220M Standard Practices for Preserving and Transporting Soil Samples*， 2024-04-22 Update
• ASTM D4318 Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils
• ASTM D4542 Standard Test Method for Pore Water Extraction and Determination of the Soluble Salt Content of Soils by Refractometer
• ASTM D4647/D4647M Standard Test Methods for Identification and Classification of Dispersive Clay Soils by the Pinhole Test*， 2020-02-01 Update
• ASTM D6026 Standard Practice for Using Significant Digits in Geotechnical Data
• ASTM D653 Standard Terminology Relating to Soil, Rock, and Contained Fluids
• ASTM D6572 Standard Test Methods for Determining Dispersive Characteristics of Clayey Soils by the Crumb Test*， 2021-05-01 Update
• ASTM D6913 Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis
• ASTM D7928 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis*， 2021-05-01 Update

ASTM D4221-17 history

• 2018 ASTM D4221-18 Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
• 2017 ASTM D4221-17 Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
• 2011 ASTM D4221-11 Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
• 1999 ASTM D4221-99(2005) Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer
• 1999 ASTM D4221-99 Standard Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer