ASTM D7428-08e1
(Test Method)Standard Test Method for Resistance of Fine Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus
Standard Test Method for Resistance of Fine Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus
SIGNIFICANCE AND USE
The Micro-Deval abrasion test is a test of fine 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 to degradation. The test results are helpful in evaluating the toughness/abrasion resistance of fine aggregate subject to abrasion when adequate information is not available from service records. This test is suitable for measuring the amount of weak, soft material such as shale or shaley carbonate in fine aggregate. Materials that give a low loss in this test are unlikely to exhibit significant degradation during handling, mixing or placing. There is a relationship between drying shrinkage of cement mortar and Micro-Deval abrasion loss of fine aggregate, with higher loss materials resulting in higher drying shrinkage. Descriptions of the development of the test and the relationship with other properties have been published. , ,
The Micro-Deval abrasion test on fine aggregate is useful for detecting changes in properties of aggregate produced from an aggregate source as part of a quality control or quality assurance process.
The Micro-Deval abrasion test on fine aggregate, in contrast to the version on coarse aggregate, has a significant correlation with the Magnesium Sulfate soundness loss of fine aggregate. The Micro-Deval test on fine aggregate has better precision than the sulfate soundness test, is quicker, and may be used in place of that test. Advice on specific values for selection of aggregate will be found in the appendix.
SCOPE
1.1 This test method covers a procedure for testing fine 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 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.
General Information
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Standards Content (Sample)
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Designation: D7428 − 08
StandardTest Method for
Resistance of Fine Aggregate to Degradation by Abrasion in
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the Micro-Deval Apparatus
This standard is issued under the fixed designation D7428; 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.
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ε NOTE—Research report footnote was added editorially to Section 13 in March 2009.
1. Scope 3. Terminology
1.1 This test method covers a procedure for testing fine 3.1 Definitions:
aggregate for resistance to abrasion using the Micro-Deval 3.1.1 constant mass, n—the condition of a test sample dried
apparatus. at a temperature of 110 6 5°C such that it will not lose more
than 0.1 % moisture after2hof drying.
1.2 The values stated in SI units are to be regarded as the
3.1.1.1 Discussion—Such a condition of dryness can be
standard.
verifiedbydeterminingthemassofthesamplebeforeandafter
1.3 The text of this method references notes and footnotes
successive 2-h drying periods. In lieu of such a determination,
which provide explanatory material. These notes and footnotes
samples may be considered to have reached constant mass
(excluding those in tables and figures) shall not be considered
when they have been dried at a temperature of 110 6 5°C for
as requirements of the test method.
an equal or longer period than that previously found adequate
1.4 This standard does not purport to address all of the for producing the desired constant mass condition under equal
safety concerns, if any, associated with its use. It is the
or heavier loading conditions of the oven.
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety and health practices and determine the applica-
4.1 The Micro-Deval Test is a measure of abrasion resis-
bility of regulatory limitations prior to use.
tance and durability of mineral aggregates resulting from a
combination of actions including abrasion and grinding with
2. Referenced Documents
2 steel balls in the presence of water. A 500-g sample with
2.1 ASTM Standards:
standard grading is initially soaked in water for not less than
C88 Test Method for Soundness of Aggregates by Use of
one hour.The sample is then placed in a jar mill with 0.75 Lof
Sodium Sulfate or Magnesium Sulfate
water and an abrasive charge consisting of 1250 g of 9.5-mm
C117 Test Method for Materials Finer than 75-µm (No. 200)
diameter steel balls. The jar, aggregate, water, and charge are
Sieve in Mineral Aggregates by Washing
revolvedat100rpmfor15minutes.Thesampleisthenwashed
C136 Test Method for Sieve Analysis of Fine and Coarse
and oven dried. The loss is the amount of material passing the
Aggregates
75 µm sieve expressed as a percent by mass of the original
C670 Practice for Preparing Precision and Bias Statements
sample.
for Test Methods for Construction Materials
D6928 Test Method for Resistance of Coarse Aggregate to
5. Significance and Use
Degradation by Abrasion in the Micro-Deval Apparatus
5.1 The Micro-Deval abrasion test is a test of fine aggregate
E11 Specification for Woven Wire Test Sieve Cloth and Test
to determine abrasion loss in the presence of water and an
Sieves
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 to degradation. The
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This test method is under the jurisdiction of ASTM Committee D04 on Road
test results are helpful in evaluating the toughness/abrasion
and Paving Materials and is the direct responsibility of Subcommittee D04.51 on
resistance of fine aggregate subject to abrasion when adequate
Aggregate Tests.
information is not available from service records. This test is
Current edition approved Feb. 1, 2008. Published March 2008. DOI: 10.1520/
D7428-08E01.
suitable for measuring the amount of weak, soft material such
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
as shale or shaley carbonate in fine aggregate. Materials that
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
give a low loss in this test are unlikely to exhibit significant
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. degradation during handling, mixing or placing. There is a
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D7428 − 08
relationship between drying shrinkage of cement mortar and 7. Supplies
Micro-Deval abrasion loss of fine aggregate, with higher loss
7.1 Laboratory Reference Aggregate—Asu
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