ASTM D6928-06

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Designation:D6928–06
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 successive 2-h drying periods. In lieu of such a determination,
samples may be considered to have reached constant mass
1.1 This method covers a procedure for testing coarse
when they have been dried at a temperature of 110 6 5°C for
aggregate for resistance to abrasion using the Micro-Deval
an equal or longer period than that previously found adequate
apparatus.
for producing the desired constant mass condition under equal
1.2 The values stated in SI units are to be regarded as the
or heavier loading conditions of the oven.
standard.
1.3 The text of this method references notes and footnotes
4. Summary of Test Method
which provide explanatory material. These notes and footnotes
4.1 The Micro-Deval Test is a measure of abrasion resis-
(excluding those in tables and figures) shall not be considered
tance and durability of mineral aggregates resulting from a
as requirements of the test method.
combination of actions including abrasion and grinding with
1.4 This procedure may involve hazardous materials, opera-
steel balls in the presence of water. A sample with standard
tions, and equipment. This standard does not purport to
grading is initially soaked in water for not less than one hour.
address all of the safety concerns, if any, associated with its
The sample is then placed in a jar mill with 2.0 L of water and
use. It is the responsibility of the user of this standard to
an abrasive charge consisting of 5000 g of 9.5-mm diameter
establish appropriate safety and health practices and deter-
steelballs.Thejar,aggregate,water,andchargearerevolvedat
mine the applicability of regulatory limitations prior to use.
100 rpm for up to 2 h, depending on the particle size. The
2. Referenced Documents sample is then washed and oven dried. The loss is the amount
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of material passing the 1.18-mm sieve expressed as a percent
2.1 ASTM Standards:
by mass of the original sample.
C 136 Test Method for Sieve Analysis of Fine and Coarse
Aggregates
5. Significance and Use
C 670 Practice for Preparing Precision and Bias Statements
5.1 The Micro-Deval abrasion test is a test of coarse
for Test Methods for Construction Materials
aggregate to determine abrasion loss in the presence of water
E11 Specification for Wire Cloth and Sieves for Testing
and an abrasive charge. Many aggregates are more susceptible
Purposes
whenwetthandry,andtheuseofwaterinthistestincorporates
3. Terminology this reduction in resistance in degradation in contrast to some
other tests, which are conducted on dry aggregate. The test
3.1 Definitions:
results are helpful in evaluating the toughness/abrasion resis-
3.1.1 constant mass, n—test samples dried at a temperature
tance of coarse aggregate subject to abrasion when adequate
of 110 6 5°C to a condition such that it will not lose more than
information is not available from service records.
0.1 % moisture after2hof drying. Such a condition of dryness
5.2 The Micro-Deval abrasion test is useful for detecting
can be verified by weighing the sample before and after
changes in properties of aggregate produced from an aggregate
source as part of a quality control or quality assurance process.
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This test method is under the jurisdiction of ASTM Committee D04 on Road
6. Apparatus
and Paving Materials and is the direct responsibility of Subcommittee D04.51 on
Aggregate Tests.
6.1 Micro-Deval Abrasion Machine, a jar rolling mill ca-
Current edition approved Jan. 1, 2006. Published January 2006. Originally
pable of running at 100 6 5 rpm (Fig. 1).
approved in 2003. Last previous edition approved in 2003 as D 6928 – 03.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Containers, stainless steel Micro-Deval abrasion jars
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
having a 5-L capacity with a rubber ring in the rotary locking
Standards volume information, refer to the standard’s Document Summary page on
cover. External diameter of 194-mm to 202-mm. Internal
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6928–06
FIG. 1 Micro-Deval Abrasion Machine and Container
height of 170-mm to 177-mm. The inside and outside surfaces 6.6 Balance, or scale accurate to 1.0 g.
of
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