ASTM D2728-98(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D2728–98 (Reapproved 2003)
Standard Practice for
Paving Uses and Application Temperatures for Road Tars
This standard is issued under the fixed designation D2728; 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.
1. Scope 3.1.3 patch mix—a mixture of bituminous material and
mineral aggregate for patching holes, depressions, and dis-
1.1 This practice covers the selection and application tem-
tressed areas in existing pavements. These mixes are suitable
peratures of road tar grades in the construction and mainte-
for use in relatively small areas, applied at ambient tempera-
nance of pavements.
ture, using hand-laying and hand-compaction techniques.
2. Referenced Documents
These mixes may be designed for immediate use or for
stock-piling prior to use.
2.1 ASTM Standards:
3.1.4 sand aggregate—non-plastic mineral aggregate, es-
D8 Terminology Relating to Materials for Roads and Pave-
sentially all passing the 4.75-mm sieve, and containing no
ments
more than a minor percentage passing the 75-µm sieve.
3. Terminology
4. Significance and Use
3.1 The definitions of terms not included inTerminology D8
4.1 This practice provides information on the recommended
are listed below.
uses and application temperatures for the various grades of
3.1.1 dust palliative—a light application of a low-viscosity
road tar used in the construction and maintenance of pave-
bituminous material for the express purpose of laying and
ments.
bonding dust or preventing a dust nuisance.
3.1.2 plant mix—a mixture of bituminous material and
5. Recommended Uses
mineral aggregate prepared in a central bituminous mixing
5.1 The recommendations shown in Table 1 are for use only
plant, then spread and compacted at the job site. Plant mixes
as a guide when using tar for pavement construction and
include:
maintenance.Severalgradesoftarmaybelistedinthetablefor
3.1.2.1 cold lay tar concrete—a plant mix containing a
the same general construction procedure. Selection of a par-
medium viscosity grade of tar and a less densely graded
ticular grade will depend upon local practice, equipment
aggregate designed to be laid either shortly after mixing or
availability, traffic, and environmental conditions applicable to
when the mixture is at or near ambient temperature.
the specific project being considered.
3.1.2.2 hot lay tar concrete—a plant mix containing a high
viscosity grade of tar and a densely graded mineral aggregate,
6. Recommended Application Temperatures
designed to be laid at or near the elevated temperature of
6.1 The temperature ranges listed in Table 1 for the several
mixing.
road tar grades show the minimum and maximum temperatures
3.1.2.3 sand mix—a plant mix containing sand aggregate
that will provide proper viscosity for application. In general,
and a high-viscosity grade of tar designed to be laid immedi-
the lower application temperatures may be used when higher
ately.
temperatures of aggregate and pavement surfaces prevail.
3.1.2.4 soil mix—a p
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