ASTM D490-92(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D490 – 92 (Reapproved 2005)
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 Department of Defense.
1. Scope D140 Practice for Sampling Bituminous Materials
D1665 Test Method for Engler Specific Viscosity of Tar
1.1 This specification covers 14 grades of tar as follows:
Products
RT-1, RT-2, RT-3, RT-4, RT-5, RT-6, RT-7, RT-8, RT-9, RT-10,
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:
4. Sampling
D4 Test Method for Bitumen Content
4.1 The material shall be sampled in accordance with
D20 Test Method for Distillation of Road Tars
Practice D140.
D36 Test Method for Softening Point of Bitumen (Ring-
and-Ball Apparatus)
5. Test Methods
D70 Test Method for Density of Semi-Solid Bituminous
5.1 The properties enumerated in Table 1 shall be deter-
Materials (Pycnometer Method)
mined in accordance with the following methods, with the
D95 Test Method for Water in Petroleum Products and
exception of the test specified in 5.1.3:
Bituminous Materials by Distillation
5.1.1 Water—Test Method D95.
D139 Test Method for Float Test for Bituminous Materials
5.1.2 Specific Gravity— Test Method D70.
5.1.3 Specific Viscosity—Test Method D1665. The results
This specification is under the jurisdiction of ASTM Committee D04 on Road
shall be reported as specific viscosity compared with water at
and Paving Materials and is the direct responsibility of Subcommittee D04.43 on
25°C.
Specifications and Tests for Tar and Tar Products.
5.1.4 Float Test—Test Method D139.
Current edition approved Dec. 1, 2005. Published December 2005. Originally
approved in 1938. Last previous edition approved in 2001 as D490 – 92 (2001). 5.1.5 Distillation— Test Method D20.
DOI: 10.1520/D0490-92R05.
5.1.6 Softening Point— Test Method D36.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.7 Total Bitumen— Test Method D4.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D490 – 92 (2005)
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) 5to8 8to13 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 (33
...