ASTM D1856-21

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Designation: D1856 − 09 (Reapproved 2015) D1856 − 21
Standard Test Method for
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Recovery of Asphalt Fromfrom Solution by Abson Method
This standard is issued under the fixed designation D1856; 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
1.1 This test method covers the recovery by the Abson method of asphalt from a solution from a previously conducted extraction.
The asphalt is recovered with properties substantially the same as those it possessed in the bituminous mixture and in quantities
sufficient for further testing.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information
only.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
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2.1 ASTM Standards:
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D2172D2172/D2172M Test Methods for Quantitative Extraction of Asphalt Binder from Asphalt Mixtures
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D2939 Test Methods for Emulsified Bitumens Used as Protective Coatings (Withdrawn 2012)
D4080 Specification for Trichloroethylene, Technical and Vapor-Degreasing Grade
D6368 Specification for Vapor-Degreasing Solvents Based on normal-Propyl Bromide and Technical Grade normal-Propyl
Bromide
D8159 Test Method for Automated Extraction of Asphalt Binder from Asphalt Mixtures
E1 Specification for ASTM Liquid-in-Glass Thermometers
3. Summary of Test Method
3.1 The solution of solvent and asphalt from an asphalt mix extraction is distilled under prescribed conditions to a point where
most of the solvent has been distilled, at which time carbon dioxide gas is introduced into the distillation process to remove all
traces of the extraction solvent. The recovered asphalt (distillation residue) can then be subjected to further testing as required.
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This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.25 on Analysis
of Asphalt Mixtures.
Current edition approved Jan. 1, 2015May 1, 2021. Published February 2015June 2021. Originally approved in 1961. Last previous edition approved in 20092015 as
D1856 – 09.D1856 – 09 (2015). DOI: 10.1520/D1856-09R15.10.1520/D1856-21.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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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The last approved version of this historical standard is referenced on www.astm.org.
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D1856 − 21
4. Significance and Use
4.1 The asphalt should be extracted from the aggregate-asphalt mixture in accordance with Method A of Test Methods
D2172D2172/D2172M (centrifuge method) or D8159 as there is some experimental evidence that the recovered asphalt may have
slightly lower penetration values when recovered from solutions obtained from hot extraction methods.
5. Apparatus
5.1 Centrifuge, batch unit capable of exerting a minimum centrifugal force of 770 times gravity or continuous unit capable of
exerting a minimum force of 3000 times gravity.
5.2 Centrifuge Tubes—A supply of wide-mouth bottles or centrifuge tubes may be used for the batch unit. A tube as illustrated
in Fig. 1 has been found satisfactory for the continuous unit.
5.3 Distillation Assembly, as shown in Fig. 2, and consisting of the following items:
5.3.1 Extraction Flasks—Two 250-ml,250-mL, wide-mouth, heat-resistant flasks, one for distillation and the other for the receiver.
5.3.2
...