ASTM D71-94(2004)
(Test Method)Standard Test Method for Relative Density of Solid Pitch and Asphalt (Displacement Method)
Standard Test Method for Relative Density of Solid Pitch and Asphalt (Displacement Method)
SIGNIFICANCE AND USE
This test method is useful in characterizing pitches and asphalts as one element in establishing uniformity of shipments and sources of supply.
SCOPE
1.1 This test method covers the determination of relative density by water displacement of hard pitches and asphalts with softening points above 70°C.
1.2 The relative density of hard pitch and asphalt shall be determined, whenever possible, on homogeneous natural fragments free of cracks. The use of cast cubes is not recommended due to the difficulty of avoiding incorporation of air bubbles.
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:D71–94 (Reapproved 2004)
Standard Test Method for
Relative Density of Solid Pitch and Asphalt (Displacement
Method)
This standard is issued under the fixed designation D71; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
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 5. Significance and Use
1.1 This test method covers the determination of relative 5.1 This test method is useful in characterizing pitches and
density by water displacement of hard pitches and asphalts asphaltsasoneelementinestablishinguniformityofshipments
with softening points above 70°C. and sources of supply.
1.2 The relative density of hard pitch and asphalt shall be
6. Apparatus
determined, whenever possible, on homogeneous natural frag-
6.1 Pan Straddle, suitable for use with an analytical bal-
mentsfreeofcracks.Theuseofcastcubesisnotrecommended
due to the difficulty of avoiding incorporation of air bubbles. ance.
6.2 Analytical Balance, equipped with a hook above the pan
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the and capable of weighing a 20-g specimen to 1 mg.
6.3 Water Bath, maintained at 25.0 6 0.2°C and provided
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- with mechanical stirring/circulation.
6.4 Thermometer, capable of measuring water temperature
bility of regulatory limitations prior to use.
of 25.0 6 0.2°C (or other suitable temperature measuring
2. Referenced Documents
instrument).
2.1 ASTM Standards: 6.5 Nichrome Wire, 0.127-mm (5-mL) diameter or
D61 Test Method for Softening Point of Pitches (Cube-in- monofilament nylon fishing line of about the same diameter for
Water Method) attaching specimen to the balance pan hook.
D140 Practice for Sampling Bituminous Materials
7. Bulk Sampling
D4296 Practice for Sampling Pitch
7.1 Samples from shipments shall be taken in accordance
3. Terminology
with Practice D140 or D4296, and shall be free of foreign
3.1 Definition: substances. Thoroughly mix the sample before removing a
3.1.1 relative density—the ratio of a given volume of representative portion for the determination.
material at 25°C to the weight of an equal volume of water at
8. Test Specimens
the same temperature (specific gravity).
8.1 Select two fragments of the bulk sample weighing
4. Summary of Test Method
between 5 and 20 g each. Inspect the fragments carefully to
4.1 The sample is suspended from a thin wire and weighed, ensure the use of specimens free of cracks and other surface
first in air, then submerged in water at 25.0°C. The relative defects.
density is calculated from these weights. 8.2 If the nature of the material is such that specimens can
be cast without incorporation of air bubbles, follow the
preparation and casting directions in Test Method D61. Cube
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee molds measuring a minimum of 12.7 mm ( ⁄2 in.) per side or
D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.
largercanbeused.Assemblethecubemoldssothatsolidcubes
Current edition approved Nov. 1, 2004. Published November 2004. Originally
with no perforations can be cast. A softening point cube mold
approved in 1920. Last previous edition approved in 1999 as D71 – 94 (1999). DOI:
base plate can be inverted to provide the required flat surface
10.1520/D0071-94R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
on which to assemble the cube mold before pouring.
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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