ASTM D7944-15
(Practice)Standard Practice for Recovery of Emulsified Asphalt Residue Using a Vacuum Oven
Standard Practice for Recovery of Emulsified Asphalt Residue Using a Vacuum Oven
SIGNIFICANCE AND USE
4.1 This practice can be used to obtain residues of emulsified asphalts. The residue may be used for further testing.
4.2 As approximately 5 g of residue is typically obtained, limited testing is possible.
Note 1: Rheological characterization as described in Test Methods D7175 and D7405 are suitable test methods. Additional test methods are being developed suited to the small amounts of residue obtained.
SCOPE
1.1 This practice is suitable for recovery of the residue of emulsified asphalts composed principally of a semisolid or liquid asphaltic base, water and an emulsifying agent. Asphalt base may be pre-modified with polymeric modifiers or latex polymer modifiers may be incorporated into the emulsified asphalt through co-milling or post emulsified asphalt production blending.
1.2 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
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D7944 −15
Standard Practice for
Recovery of Emulsified Asphalt Residue Using a Vacuum
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Oven
This standard is issued under the fixed designation D7944; 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. Summary of Practice
3.1 Asampleofemulsifiedasphaltisspreadinathinfilmon
1.1 This practice is suitable for recovery of the residue of
a silicone rubber mat and conditioned in a vacuum oven or
emulsified asphalts composed principally of a semisolid or
other suitable vacuum chamber to remove the water.
liquid asphaltic base, water and an emulsifying agent. Asphalt
base may be pre-modified with polymeric modifiers or latex
4. Significance and Use
polymer modifiers may be incorporated into the emulsified
4.1 This practice can be used to obtain residues of emulsi-
asphalt through co-milling or post emulsified asphalt produc-
fied asphalts. The residue may be used for further testing.
tion blending.
4.2 As approximately 5 g of residue is typically obtained,
1.2 This standard does not purport to address all of the
limited testing is possible.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- NOTE 1—Rheological characterization as described in Test Methods
D7175 and D7405 are suitable test methods. Additional test methods are
priate safety and health practices and determine the applica-
being developed suited to the small amounts of residue obtained.
bility of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents
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5.1 Silicone rubber mat approximately 30 by 20 by 0.3 cm
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2.1 ASTM Standards: (approximately 12 by 9 by 0.15 in.), minimum of 40A
durometer.
D244 Test Methods and Practices for Emulsified Asphalts
D7175 Test Method for Determining the Rheological Prop-
5.2 Supports for Silicone Rubber Mat—Provide adequate
erties of Asphalt Binder Using a Dynamic Shear Rheom-
support of the silicone rubber mat during draw down of the
eter
film, while transporting to the vacuum oven or other suitable
D7405 Test Method for Multiple Stress Creep and Recovery
vacuum conditioning chamber, and while recovering the emul-
(MSCR) of Asphalt Binder Using a Dynamic Shear
sified asphalt residue. The procedure uses two separate
Rheometer
supports, one at ambient temperature for draw down and
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2.2 AASHTO Standards: transfer, and a second to support the silicone rubber mat and
emulsified asphalt during residue recovery. Adequate supports
R28 Accelerated Aging of Asphalt Binder Using a Pressur-
ized Aging Vessel (PAV) include but are not limited to a metal plate or tile with
dimensions that are larger than the silicone rubber mat.
PP 72 Standard Practice for Recovery Residue from Emul-
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sifiedAsphalt Using Low-Temperature Evaporative Tech-
5.3 Draw down applicator with the ability to draw down a
niques
wet film approximately 0.38 mm (15 mils) in thickness. (See
Fig. 1.)
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This practice is under the jurisdiction of ASTM Committee D04 on Road and
The sole source of supply of the apparatus (referred to as “Silicone Rubber
Paving Materials and is the direct responsibility of Subcommittee D04.42 on Sheeting” in catalog) known to the committee at this time is McMaster Carr, 200
Emulsified Asphalt Test. New Canton Way, Robbinsville, NJ 08691-2343, www.mcmaster.com. If you are
Current edition approved Oct. 1, 2015. Published December 2015. DOI: aware of alternative suppliers, please provide this information to ASTM Interna-
10.1520/D7944-15. tional Headquarters.Your comments will receive careful consideration at a meeting
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or of the responsible technical committee, which you may attend.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM The sole source of supply of the apparatus (8-PathWet FilmApplicator) known
Standards volume information, refer to the standard’s Document Summary page on to the committee at this time is Paul N. Gardner Company, Inc., 316 N.E. First
the ASTM website. Street,PompanoBeach,FL33060,www.gardco.com.Ifyouareawareofalternative
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Available from American Association of State Highway and Transportation suppliers, please provide this information to ASTM International Headquarters.
Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001, Your comments will receive careful consideration at a meeting of the responsible
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http://www.transportation.org. technical committee, which you may attend.
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