ASTM D6928-03
(Test Method)Standard Test Method for Resistance of Coarse Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus
Standard Test Method for Resistance of Coarse Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus
SCOPE
1.1 This 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.
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Designation:D6928–03
Standard Test Method for
Resistance of Coarse Aggregate to Degradation by Abrasion
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 an equal or longer period than that previously found adequate
for producing the desired constant mass condition under equal
1.1 This method covers a procedure for testing coarse
or heavier loading conditions of the oven.
aggregate for resistance to abrasion using the Micro-Deval
apparatus.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the
4.1 The Micro-Deval Test is a measure of abrasion resis-
standard.
tance and durability of mineral aggregates resulting from a
1.3 The text of this method references notes and footnotes
combination of actions including abrasion and grinding with
which provide explanatory material. These notes and footnotes
steel balls in the presence of water. A sample with standard
(excluding those in tables and figures) shall not be considered
grading is initially soaked in water for not less than one hour.
as requirements of the test method.
The sample is then placed in a jar mill with 2.0 L of water and
1.4 This procedure may involve hazardous materials, opera-
an abrasive charge consisting of 5000 g of 9.5-mm diameter
tions, and equipment. This standard does not purport to
steelballs.Thejar,aggregate,water,andchargearerevolvedat
address all of the safety concerns, if any, associated with its
100 rpm for up to 2 h, depending on the particle size. The
use. It is the responsibility of the user of this standard to
sample is then washed and oven dried. The loss is the amount
establish appropriate safety and health practices and deter-
of material passing the 1.18-mm sieve expressed as a percent
mine the applicability of regulatory limitations prior to use.
by mass of the original sample.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
5.1 The Micro-Deval abrasion test is a test of coarse
C 136 Test Method for Sieve Analysis of Fine and Coarse
2 aggregate to determine abrasion loss in the presence of water
Aggregates
and an abrasive charge. Many aggregates are more susceptible
C 670 Practice for Preparing Precision and Bias Statements
2 whenwetthandry,andtheuseofwaterinthistestincorporates
for Test Methods for Construction Materials
this reduction in resistance in degradation in contrast to some
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
3 other tests, which are conducted on dry aggregate. The test
poses
results are helpful in evaluating the toughness/abrasion resis-
3. Terminology tance of coarse aggregate subject to abrasion when adequate
information is not available from service records.
3.1 Definitions:
5.2 The Micro-Deval abrasion test is useful for detecting
3.1.1 constant mass, n—test samples dried at a temperature
changes in properties of aggregate produced from an aggregate
of 110 6 5°C to a condition such that it will not lose more than
source as part of a quality control or quality assurance process.
0.1 % moisture after2hof drying. Such a condition of dryness
can be verified by weighing the sample before and after
6. Apparatus
successive 2-h drying periods. In lieu of such a determination,
6.1 Micro-Deval Abrasion Machine, a jar rolling mill ca-
samples may be considered to have reached constant mass
pable of running at 100 6 5 rpm (Fig. 1).
when they have been dried at a temperature of 110 6 5°C for
6.2 Containers, stainless steel Micro-Deval abrasion jars
having a 5-L capacity with a rubber ring in the rotary locking
This test method is under the jurisdiction of ASTM Committee D04 on Road cover. External diameter of 194-mm to 202-mm. Internal
and Paving Materials and is the direct responsibility of Subcommittee D04.51 on
height of 170-mm to 177-mm. The inside and outside surfaces
Aggregate Tests.
of the jars shall be smooth and have no observable ridges or
Current edition approved Aug. 10, 2003. Published October 2003.
indentations (Fig. 1).
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6928–03
FIG. 1 Micro-Deval Abrasion Machine and Container
6.3 Abrasive Charge—Magnetic stainless steel balls are Ministry of Transportation, 1201 Wilson Avenue, Downsview,
required. These shall have a diameter of 9.5 6 0.5 mm. Each Ontario, Canada M3M1J8. Fax: 1-416-235-4101.
jar requires a charge of 5000 6 5 g of balls. 7.2 Calibration Aggregate—An adequate supply of aggre-
6.4 Sieves, with square openings, and of the following sizes gate, established by the Laboratory to use for calibration of the
conforming to Specification E 11 specifications: 19.0 mm, 16.0 test method (see 11.1).
mm, 12.5 mm, 9.5 mm, 6.3 mm, 4.75 mm, 1.18 mm. (Note )
8. Test Sample
6.5 Oven, capable of maintaining a temperature of 110 6
5°C.
8.1 The test sample shall be washed and oven-dried at 110
6.6 Balance, or scale accurate to 1.0 g.
65°Ctoconstantmass,separatedintoindividualsizefractions
in accordance with Test Method C 136, and recombined to
7. Supplies
meet the grading as shown in 8.2.
7.1 Laboratory Reference Aggregate—Asupply of standard 8.2 Aggregate for the test shall consist of material passing
“Brechin Quarry No. 2” coarse aggregate available from the the 19.0-mm sieve, retained on the 9.5-mm sieve. An oven
Soils and Aggregates Section, Engineering Materials Office, dried sample of 1500 6 5 g shall be prepared as follows:
D6928–03
Brechin Quarry No. 2 aggregate is within allowed tolerance of
Passing Retained Mass
19.0-mm 16.0-mm 375 g
11.1.1,themeanvalueobtainedwiththesupplyofthein-house
16.0-mm 12.5-mm 375 g
calibration aggregate shall be used thereafter. At any time a
12.5-mm 9.5-mm 750 g
new supply is required, the calibration procedure shall be
8.3 Inacasewherethemaximumnominalsizeofthecoarse
conducted.
aggregate is 12.5 mm, a sample of 1500 6 5 g shall be
11.1.1 The mean loss of the Brechin Quarry No. 2 reference
prepared as follows:
aggregate (see 7.1) in multi-laboratory study of the Micro-
Passing Retained Mass
Deval test is 19.1 %. For continued acceptance of data,
12.5-mm 9.5-mm 750 g
individual reference material test data must fall within the
9.5-mm 6.3-mm 375 g
6.3-mm 4.75-mm 375 g range 17.5 to 20.7 % loss for 95 % of the time.
11.2 Every 10 samples, but at leas
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