ASTM D4644-16

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.
Designation: D4644 − 16
Standard Test Method for
1
Slake Durability of Shales and Other Similar Weak Rocks
This standard is issued under the fixed designation D4644; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* D2113 Practice for Rock Core Drilling and Sampling of
Rock for Site Exploration
1.1 This test method covers the determination of the slake
D2216 Test Methods for Laboratory Determination of Water
durabilityindexofashaleorotherweakrockafterthreedrying
(Moisture) Content of Soil and Rock by Mass
and two wetting cycles with abrasion effects.
D3740 Practice for Minimum Requirements for Agencies
1.2 Units—The values stated in SI units are to be regarded
Engaged in Testing and/or Inspection of Soil and Rock as
as standard. The values given in parentheses are mathematical
Used in Engineering Design and Construction
conversions to inch-pound units, which are provided for
D4753 Guide for Evaluating, Selecting, and Specifying Bal-
information only and are not considered standard. Reporting of
ances and Standard Masses for Use in Soil, Rock, and
test results in units other than SI shall not be regarded as
Construction Materials Testing
nonconformance with this test method.
D5079 Practices for Preserving and Transporting Rock Core
1.3 All observed and calculated values shall conform to the
Samples
guidelines for significant digits and rounding established in
D6026 Practice for Using Significant Digits in Geotechnical
Practice D6026.
Data
1.3.1 Theproceduresusedtospecifyhowdataarecollected/
E11 Specification for Woven Wire Test Sieve Cloth and Test
recorded or calculated in this standard are regarded as the
Sieves
industry standard. In addition, they are representative of the
significant digits that generally should be retained. The proce-
3. Terminology
dures used do not consider material variation, purpose for
3.1 Definitions:
obtaining the data, special purpose studies, or any consider-
ations for the user’s objectives; and it is common practice to 3.1.1 For terminology used in this test method, refer to
increase or reduce significant digits of reported data to be Terminology D653.
commensuratewiththeseconsiderations.Itisbeyondthescope
3.2 Definitions of Terms Specific to This Standard:
of this standard to consider significant digits used in analysis
3.2.1 slake durability index—the percentage by dry mass of
methods for engineering design.
a collection of shale or similar rock pieces retained on a 2.00
1.4 This standard does not purport to address all of the
mm (No. 10) sieve after three cycles of oven drying and two
safety concerns, if any, associated with its use. It is the
cycles of each 10 min of soaking in distilled water within a
responsibility of the user of this standard to establish appro-
standard tumbling and abrasion action.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
4.1 This test method consists of placing ten pieces of
2
specimens each with mass of 40-60 g in a wire mesh drum
2.1 ASTM Standards:
mountedinanapparatuswherethedrumispartiallysubmerged
D653 Terminology Relating to Soil, Rock, and Contained
in a trough filled with distilled water. The specimens in the
Fluids
drum are rotated in the water for two cycles. Each cycle
includes rotation with speed of 20 rpm for 10 minutes. At the
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
end of first cycle the specimen is oven dried and the total mass
Rock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.
of specimen retained in the drum is recorded. Then, a second
Current edition approved Nov. 1, 2016. Published November 2016. Originally
cycle with the same speed and time period as the first one is
approved in 1987. Last previous edition approved in 2008 as D4644 – 08. DOI:
10.1520/D4644-16.
performed. The retained total mass of specimen from the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
second cycle is recorded. The slake durability index is calcu-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
lated based on both recorded total masses of test specimen
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. retained in the drum per each cycle.
*A Summary of Changes section appears at the end of this standard
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