ASTM D71-94(2009)
(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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D71 − 94(Reapproved 2009)
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 4. Summary of Test Method
4.1 The sample is suspended from a thin wire and weighed,
1.1 This test method covers the determination of relative
density by water displacement of hard pitches and asphalts first in air, then submerged in water at 25.0°C. The relative
density is calculated from these weights.
with softening points above 70°C.
1.2 The relative density of hard pitch and asphalt shall be
5. Significance and Use
determined, whenever possible, on homogeneous natural frag-
5.1 This test method is useful in characterizing pitches and
mentsfreeofcracks.Theuseofcastcubesisnotrecommended
asphaltsasoneelementinestablishinguniformityofshipments
due to the difficulty of avoiding incorporation of air bubbles.
and sources of supply.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
6. Apparatus
standard.
6.1 Pan Straddle, suitable for use with an analytical bal-
1.4 This standard does not purport to address all of the
ance.
safety concerns, if any, associated with its use. It is the
6.2 Analytical Balance, equipped with a hook above the pan
responsibility of the user of this standard to establish appro-
and capable of weighing a 20-g specimen to 1 mg.
priate safety and health practices and determine the applica-
6.3 Water Bath, maintained at 25.0 6 0.2°C and provided
bility of regulatory limitations prior to use.
with mechanical stirring/circulation.
2. Referenced Documents
6.4 Thermometer, capable of measuring water temperature
of 25.0 6 0.2°C (or other suitable temperature measuring
2.1 ASTM Standards:
instrument).
D61 Test Method for Softening Point of Pitches (Cube-in-
Water Method)
6.5 Nichrome Wire, 0.127-mm (5-mL) diameter or mono-
D140 Practice for Sampling Bituminous Materials
filament nylon fishing line of about the same diameter for
D4296 Practice for Sampling Pitch
attaching specimen to the balance pan hook.
3. Terminology 7. Bulk Sampling
7.1 Samples from shipments shall be taken in accordance
3.1 Definitions:
with Practice D140 or Practice D4296, and shall be free of
3.1.1 relative density—the ratio of a given volume of
foreign substances. Thoroughly mix the sample before remov-
material at 25°C to the weight of an equal volume of water at
the same temperature (specific gravity). ing a representative portion for the determination.
8. Test Specimens
8.1 Select two fragments of the bulk sample weighing
This test method is under the jurisdiction of ASTM Committee D02 on
between 5 and 20 g each. Inspect the fragments carefully to
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.
ensure the use of specimens free of cracks and other surface
Current edition approved Oct. 1, 2009. Published November 2009. Originally
defects.
approved in 1920. Last previous edition approved in 2004 as D71–94(2004). DOI:
10.1520/D0071-94R09.
8.2 If the nature of the material is such that specimens can
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
be cast without incorporation of air bubbles, follow the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
preparation and casting directions in Test Method D61. Cube
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. molds measuring a minimum of 12.7 mm ( ⁄2 in.) per side or
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D71 − 94 (2009)
largercanbeused.A
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