ASTM D2489-02
(Practice)Standard Practice for Estimating Degree of Particle Coating of Bituminous-Aggregate Mixtures
Standard Practice for Estimating Degree of Particle Coating of Bituminous-Aggregate Mixtures
SIGNIFICANCE AND USE
The procedure in this practice for estimating the percentage of coated particles after varying mixing times is used to establish the least mixing time required to produce satisfactory coating for a given set of conditions. This procedure can also be used to sample cold mixtures from stockpiles to determine that satisfactory coating has been retained in the stockpile.
This procedure is used with hot-mixed, hot-laid bituminous paving mixtures such as specified in Specification D 3515 or with cold-mixed, cold-laid bituminous paving mixtures such as specified in Specification D 4215.
Note 1—Even when a paving mixture complies with the “percent of coated particles” that may be specified, there is no assurance that the asphalt cement is uniformly distributed throughout the mixture.
SCOPE
1.1 This practice provides an estimate of the degree of particle coating in a bituminous-aggregate mixture on the basis of the percentage of coarse particles classified as being completely coated.
1.2 The values stated in SI units are regarded as being standard.
1.3 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:D2489–02
Standard Practice for
Estimating Degree of Particle Coating of Bituminous-
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Aggregate Mixtures
This standard is issued under the fixed designation D2489; 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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.2 For descriptions of mixing plant terms, see Mixing
Plants, Specification D995.
1.1 This practice provides an estimate of the degree of
particle coating in a bituminous-aggregate mixture on the basis
4. Significance and Use
of the percentage of coarse particles classified as being
4.1 The procedure in this practice for estimating the per-
completely coated.
centage of coated particles after varying mixing times is used
1.2 The values stated in SI units are regarded as being
to establish the least mixing time required to produce satisfac-
standard.
tory coating for a given set of conditions. This procedure can
1.3 This standard does not purport to address all of the
also be used to sample cold mixtures from stockpiles to
safety concerns, if any, associated with its use. It is the
determine that satisfactory coating has been retained in the
responsibility of the user of this standard to establish appro-
stockpile.
priate safety and health practices and determine the applica-
4.2 This procedure is used with hot-mixed, hot-laid bitumi-
bility of regulatory limitations prior to use.
nous paving mixtures such as specified in Specification D3515
2. Referenced Documents or with cold-mixed, cold-laid bituminous paving mixtures such
2
as specified in Specification D4215.
2.1 ASTM Standards:
D8 Terminology Relating to Materials for Roads and Pave-
NOTE 1—Even when a paving mixture complies with the “percent of
ments
coated particles” that may be specified, there is no assurance that the
asphalt cement is uniformly distributed throughout the mixture.
D979 Practice for Sampling Bituminous Paving Mixtures
D995 Specification for Mixing Plants for Hot-Mixed, Hot-
5. Apparatus
3
Laid Bituminous Paving Mixtures
3
5.1 Sieves, 9.5 mm ( ⁄8 in.) and 4.75 mm (No. 4). The sieves
D3515 Specification for Hot-Mixed, Hot-Laid Bituminous
3
shall conform to Specification E11.
Paving Mixtures
5.2 Stopwatch, for checking actual mixing time of batch
D3665 Practice for Random Sampling of Construction Ma-
plants.
terials
5.3 Thermometer, range at least from 10°C (50°F) to 204°C
D4215 Specification for Cold-Mixed, Cold-Laid Bitumi-
(400°F).
nous Paving Mixtures
5.4 Sample Shovel.
E11 SpecificationforWovenWireTestSieveClothandTest
5.5 Sample Trays.
Sieves
6. Sampling
3. Terminology
6.1 Batch Plant—Permit the plant to operate at an estab-
3.1 For definitions of terms, see Terminology D8.
lished mixing time per batch (timed by a stopwatch).
6.2 Continuous Mix Plant—Establish a mixing time by use
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
of the following formula:
Paving Materials and is the direct responsibility of Subcommittee D04.23 on
mixing time 5 pug mill contents, kg ~lb!/pug mill output, kg/s ~lb/s!
Plant-Mixed Bituminous Surfaces and Bases.
(1)
Current edition approved July 10, 2002. Published October 2002. Originally
published as D2489 – 66 T. Last previous edition D2489 – 00. DOI: 10.1520/
6.3 Drum Mix Plant—Operate the plant at a steady state
D2489-02.
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condition for a period of time long enough to complete the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
sampling.
Standards volume information, refer to the standard’s Document Summary page on
6.4 Samples should be taken at the site of the bituminous
the ASTM website.
3
mixing plant immediately after discharge from the plant from
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org. three truck loads selected at random in accordance with
*A Summary of Changes section appears at the end of this standard.
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D2489–02
Practice D3665 and sampled in accordance with Practice three operations. Reduce shaking to a minimum to prevent
D979. Approximately 2.5 to 4.0 kg (5 to 8 lb) is required to recoating of uncoated particles.
perform the procedure. 7.2 Place particles on a clean surface in a one-particle layer
and start count immediately.
6.5 If sampling truck loads is impractical, sample from the
7.3 Very carefully examine each particle under direct sun-
roadway before compaction starts at three locations selected at
lig
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