ASTM D7906-22
(Practice)Standard Practice for Recovery of Asphalt Binder from Solution Using Toluene and the Rotary Evaporator
Standard Practice for Recovery of Asphalt Binder from Solution Using Toluene and the Rotary Evaporator
SIGNIFICANCE AND USE
4.1 To determine the characteristics of the asphalt in an asphalt paving mixture, it is necessary to extract the asphalt from the aggregate by means of a suitable solvent and then to recover the asphalt from the solvent without significantly changing the asphalt’s properties. The asphalt recovered from the solvent by this practice can be tested using the same methods as for the original asphalt cement, and comparisons between the properties of the original and recovered asphalt can be made.
4.2 Users are cautioned that the recovered binder properties from an asphalt mixture sample may not exactly represent the properties of the original asphalt binder due to factors outside of laboratory control such as aging, contamination, and molecular changes caused by exposure to heat and solvents. Consequently, recovered asphalt binder properties should not be used as a basis for acceptance.
Note 1: The quality of the results produced by this is dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, and so forth. Users of this practice are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.
SCOPE
1.1 This practice is intended to be used to recover asphalt from a solvent using the rotary evaporator to ensure that changes in the asphalt properties during the recovery process are minimized.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental 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.
General Information
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Standards Content (Sample)
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.
Designation: D7906 − 22
Standard Practice for
Recovery of Asphalt Binder from Solution Using Toluene
1
and the Rotary Evaporator
This standard is issued under the fixed designation D7906; 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 The solution of solvent and asphalt from a prior extrac-
1.1 This practice is intended to be used to recover asphalt
tion is first distilled by partially immersing the rotating
from a solvent using the rotary evaporator to ensure that
distillation flask of the rotary evaporator in a heated oil bath
changes in the asphalt properties during the recovery process
while the solution is subjected to a partial vacuum. During the
are minimized.
final stage of the process, vacuum is increased and nitrogen or
1.2 Units—The values stated in SI units are to be regarded
carbon dioxide gas is introduced to the solution to remove
as standard. No other units of measurement are included in this
remaining toluene and prevent further aging of the asphalt.The
standard.
recovered asphalt can then be tested as required.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 4.1 To determine the characteristics of the asphalt in an
asphalt paving mixture, it is necessary to extract the asphalt
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. from the aggregate by means of a suitable solvent and then to
recover the asphalt from the solvent without significantly
1.4 This international standard was developed in accor-
changing the asphalt’s properties. The asphalt recovered from
dance with internationally recognized principles on standard-
the solvent by this practice can be tested using the same
ization established in the Decision on Principles for the
methods as for the original asphalt cement, and comparisons
Development of International Standards, Guides and Recom-
between the properties of the original and recovered asphalt
mendations issued by the World Trade Organization Technical
can be made.
Barriers to Trade (TBT) Committee.
4.2 Users are cautioned that the recovered binder properties
2. Referenced Documents
from an asphalt mixture sample may not exactly represent the
properties of the original asphalt binder due to factors outside
2
2.1 ASTM Standards:
of laboratory control such as aging, contamination, and mo-
D92 Test Method for Flash and Fire Points by Cleveland
lecular changes caused by exposure to heat and solvents.
Open Cup Tester
Consequently, recovered asphalt binder properties should not
D2172/D2172M TestMethodsforQuantitativeExtractionof
be used as a basis for acceptance.
Asphalt Binder from Asphalt Mixtures
NOTE 1—The quality of the results produced by this is dependent on the
D3666 Specification for Minimum Requirements for Agen-
competence of the personnel performing the procedure and the capability,
cies Testing and Inspecting Road and Paving Materials
calibration, and maintenance of the equipment used. Agencies that meet
E1137/E1137M Specification for Industrial Platinum Resis-
the criteria of Specification D3666 are generally considered capable of
tance Thermometers
competent and objective testing, sampling, inspection, and so forth. Users
of this practice are cautioned that compliance with Specification D3666
alone does not completely ensure reliable results. Reliable results depend
on many factors; following the suggestions of Specification D3666 or
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
some similar acceptable guideline provides a means of evaluating and
Paving Materials and is the direct responsibility of Subcommittee D04.25 on
controlling some of those factors.
Analysis of Asphalt Mixtures.
Current edition approved May 1, 2022. Published June 2022. Originally
5. Apparatus
approved in 2014. Last previous edition approved in 2014 as D7906 – 14. DOI:
10.1520/D7906-22.
5.1 Rotary Evaporator (see Fig. 1), equipped with distilla-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tion flask, variable speed motor capable of rotating the distil-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
lation flask at a rate of at least 40 rpm, condenser (Note 2),
Standards volume information,
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7906 − 14 D7906 − 22
Standard Practice for
Recovery of Asphalt Binder from Solution Using Toluene
1
and the Rotary Evaporator
This standard is issued under the fixed designation D7906; 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 practice is intended to be used to recover asphalt from a solvent using the rotary evaporator to ensure that changes in the
asphalt properties during the recovery process are minimized.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
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
2
2.1 ASTM Standards:
D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester
D2172/D2172M Test Methods for Quantitative Extraction of Asphalt Binder from Asphalt Mixtures
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
E1137/E1137M Specification for Industrial Platinum Resistance Thermometers
3. Summary of Practice
3.1 The solution of solvent and asphalt from a prior extraction is first distilled by partially immersing the rotating distillation flask
of the rotary evaporator in a heated oil bath while the solution is subjected to a partial vacuum. During the final stage of the process,
vacuum is increased and nitrogen or carbon dioxide gas is introduced to the solution to remove remaining toluene and prevent
further aging of the asphalt. The recovered asphalt can then be tested as required.
4. Significance and Use
4.1 To determine the characteristics of the asphalt in an asphalt paving mixture, it is necessary to extract the asphalt from the
1
This practice 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
BituminousAsphalt Mixtures.
Current edition approved Jan. 1, 2014May 1, 2022. Published February 2014June 2022. Originally approved in 2014. Last previous edition approved in 2014 as
D7906 – 14. DOI: 10.1520/D7906-14.10.1520/D7906-22.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7906 − 22
aggregate by means of a suitable solvent and then to recover the asphalt from the solvent without significantly changing the
asphalt’s properties. The asphalt recovered from the solvent by this practice can be tested using the same methods as for the original
asphalt cement, and comparisons between the properties of the original and recovered asphalt can be made.
4.2 Users are cautioned that the recovered binder properties from an asphalt mixture sample may not exactly represent the
properties of the original asphalt binder due to factors outside of laboratory control such as aging, contamination, and molecular
changes caused by exposure to heat and solvents. Consequently, recovered asphalt binder properties should not be used as a basis
for acceptance.
NOTE 1—The quality of the results produced by this is dependent on the competence of the personnel performing the procedure and the capability,
calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent
and objective testing, sampling, inspection, and so forth. Users of this practice are cautioned that compliance with Specification D3666 alone
...
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