ASTM D490-92(2016)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D490 − 92 (Reapproved 2016)
Standard Specification for
Road Tar
This standard is issued under the fixed designation D490; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope D139 Test Method for Float Test for Bituminous Materials
D140 Practice for Sampling Bituminous Materials
1.1 This specification covers 14 grades of tar as follows:
D1665 Test Method for Engler Specific Viscosity of Tar
RT-1, RT-2, RT-3, RT-4, RT-5, RT-6, RT-7, RT-8, RT-9, RT-10,
Products
RT-11, RT-12, RT.C.B.-5, and RT.C.B.-6.
3. Physical Requirements
2. Referenced Documents
3.1 The tar shall conform to the requirements in Table 1.
2.1 ASTM Standards:
D4 Test Method for Bitumen Content
4. Sampling
D20 Test Method for Distillation of Road Tars
4.1 The material shall be sampled in accordance with
D36 Test Method for Softening Point of Bitumen (Ring-and-
Practice D140.
Ball Apparatus)
D70 Test Method for Density of Semi-Solid Bituminous
5. Test Methods
Materials (Pycnometer Method)
5.1 The properties enumerated in Table 1 shall be deter-
D95 Test Method for Water in Petroleum Products and
mined in accordance with the following methods, with the
Bituminous Materials by Distillation
exception of the test specified in 5.1.3:
5.1.1 Water—Test Method D95.
This specification is under the jurisdiction of ASTM Committee D04 on Road 5.1.2 Specific Gravity—Test Method D70.
and Paving Materials and is the direct responsibility of Subcommittee D04.43 on
5.1.3 Specific Viscosity—Test Method D1665. The results
Specifications and Test for Tar and Tar Products.
shall be reported as specific viscosity compared with water at
Current edition approved July 1, 2016. Published August 2016. Originally
25°C.
approved in 1938. Last previous edition approved in 2011 as D490 – 92 (2011).
DOI: 10.1520/D0490-92R16.
5.1.4 Float Test—Test Method D139.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.5 Distillation—Test Method D20.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.6 Softening Point—Test Method D36.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.1.7 Total Bitumen—Test Method D4.
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D490 − 92 (2016)
TABLE 1 Requirements for Tar
Grade Grade Grade Grade Grade Grade Grade
RT-1 RT-2 RT-3 RT-4 RT-5 RT-6 RT-7
Water by volume %, max 2.00 2.00 2.00 2.00 1.5 1.5 1.0
Specific gravity at 25/25°C 1.08 1.08 1.09 1.09 1.10 1.10 1.12
(77/77°F), min
A
Specific viscosity:
Engler, 50 mL:
at 40°C (104°F) 5 to 8 8 to 13 13 to 22 22 to 35 . . .
at 50°C (122°F) . . . . 17 to 26 26 to 40 .
A
Float test, s:
at 32°C (89.6°F) . . . . . . 50 to 80
at 50°C (122°F) . . . . . . .
Distillation test on water-free
material
Total distillate, mass %:
to 170°C (338°F) 7.0 max 7.0 max 7.0 max 5.0 max 5.0 max 5.0 max 3.0 max
to 200°C (392°F) . . . . . .
...