ASTM D6928-08

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Designation:D6928–06 Designation:D6928–08
Standard Test Method for
Resistance of Coarse Aggregate to Degradation by Abrasion
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in the Micro-Deval Apparatus
This standard is issued under the fixed designation D 6928; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a procedure for testing coarse aggregate for resistance to abrasion using the Micro-Deval apparatus.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 The text of this method references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the test method.
1.4 This procedure may involve hazardous materials, operations, and equipment. 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.
2. Referenced Documents
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2.1 ASTM Standards:
C 136 Test Method for Sieve Analysis of Fine and Coarse Aggregates
C 670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
E 11 Specification for Wire Cloth and Sieves for Testing Purposes
3. Terminology
3.1 Definitions:
3.1.1 constant mass, n—the condition of a test samples dried at a temperature of 110 6 5°C to a condition such that it will not
lose more than 0.1 % moisture after2hof drying.
3.1.1.1 Discussion—Such a condition of dryness can be verified by weighingdetermining the mass of the sample before and
after successive 2-h drying periods. In lieu of such a determination, samples may be considered to have reached constant mass
when they have been dried at a temperature of 110 6 5°C for an equal or longer period than that previously found adequate for
producing the desired constant mass condition under equal or heavier loading conditions of the oven.
4. Summary of Test Method
4.1 The Micro-DevalTest is a measure of abrasion resistance and durability of mineral aggregates resulting from a combination
of actions including abrasion and grinding with steel balls in the presence of water. A sample with standard grading is initially
soaked in water for not less than one hour. The sample is then placed in a jar mill with 2.0 L of water and an abrasive charge
consisting of 5000 g of 9.5-mm diameter steel balls. The jar, aggregate, water, and charge are revolved at 100 rpm for up to 2 h,
depending on the particle size.The sample is then washed and oven dried.The loss is the amount of material passing the 1.18-mm
sieve expressed as a percent by mass of the original sample.
5. Significance and Use
5.1 The Micro-Deval abrasion test is a test of coarse aggregate to determine abrasion loss in the presence of water and an
abrasive charge. Many aggregates are more susceptible to abrasion when wet than dry, and the use of water in this test incorporates
this reduction in resistance into degradation in contrast to some other tests, which are conducted on dry aggregate. The test results
are helpful in evaluating the toughness/abrasion resistance of coarse aggregate subject to abrasion when adequate information is
not available from service records.
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This test method is under the jurisdiction ofASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate
Tests.
Current edition approved Jan.Feb. 1, 2006.2008. Published January 2006.March 2008. Originally approved in 2003. Last previous edition approved in 20032006 as
D 6928 – 036.
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volume information, refer to the standard’s Document Summary page on the ASTM website.
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D6928–08
5.2 The Micro-Deval abrasion test is useful for detecting changes in properties of aggregate produced from an aggregate source
as part of a quality control or quality assurance process.
6. Apparatus
6.1 Micro-Deval Abr
...