ASTM D6703-19
(Test Method)Standard Test Method for Automated Heithaus Titrimetry
Standard Test Method for Automated Heithaus Titrimetry
SIGNIFICANCE AND USE
5.1 This test method is intended as a laboratory diagnostic tool for estimating the colloidal stability of bitumen asphalt, asphalt cross blends, aged asphalt, and heavy oil residuum. Historically, bituminous asphalt and heavy oil residua have been modeled as colloidal suspensions in which a polar associated asphaltene moiety (the dispersed phase) is suspended in a maltene solvent moiety (the dispersing medium) (refer to Test Methods D3279 and D4124 for further definition of asphalt fraction materials). The extent to which these two moieties remain in state of peptization is a measure of the compatibility (colloidal stability) of the suspension. Compatibility may influence the physical properties of these materials, including rheological properties, for example, phase angle and viscosity. This test method and other similar test methods, along with the classical Heithaus test, may be recommended as a measure of the overall compatibility of a colloidal system by determining a parameter referred to as the state of peptization, P. The value of P commonly varies between 2.5 to 10 for unmodified or neat asphalts. Materials calculated to have low values of P are designated incompatible. Materials calculated to have high P values are designated compatible. Values in P are calculated as a function of two parameters that relate to the peptizability of the asphaltene moiety (the asphaltene peptizability parameter, pa) and the solvent power of the maltene moiety (the maltene peptizing power parameter, po). Values of pa and po are calculated as functions of the quantities Cmin and FRmax. Values of Cmin and FRmax are determined from experimental variables, the weight of asphalt (Wa), the volume of solvent (VS) to dissolve the weight of asphalt, and the volume of titrant (VT) added to initiate flocculation.
SCOPE
1.1 This test method describes a procedure for quantifying three Heithaus compatibility parameters that quantify the colloidal stability of asphalts and asphalt cross blends and aged asphalts.
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 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
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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:D6703 −19
Standard Test Method for
1
Automated Heithaus Titrimetry
This standard is issued under the fixed designation D6703; 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 D8055 Guide for Selecting an Appropriate Electronic Ther-
mometer for Replacing Mercury Thermometers in D04
1.1 This test method describes a procedure for quantifying
Road and Paving Standards
three Heithaus compatibility parameters that quantify the
E169 PracticesforGeneralTechniquesofUltraviolet-Visible
colloidalstabilityofasphaltsandasphaltcrossblendsandaged
Quantitative Analysis
asphalts.
E563 Practice for Preparation and Use of an Ice-Point Bath
1.2 Units—The values stated in SI units are to be regarded
as a Reference Temperature
as standard. No other units of measurement are included in this
E644 Test Methods for Testing Industrial Resistance Ther-
standard.
mometers
1.3 The text of this standard references notes and footnotes
3. Terminology
which provide explanatory material.These notes and footnotes
3.1 Refer to Terminology D8 for definitions of terms relat-
(excluding those in tables and figures) shall not be considered
ing to materials for roads and pavements.
as requirements of the standard.
3.2 Definitions of Terms Specific to This Standard:
1.4 This standard does not purport to address all of the
3.2.1 asphaltene peptizability, n—the tendency of as-
safety concerns, if any, associated with its use. It is the
phaltenes to exist as a stable dispersion in a maltene solvent,
responsibility of the user of this standard to establish appro-
measured by the Heithaus parameter p .
priate safety, health, and environmental practices and deter-
a
mine the applicability of regulatory limitations prior to use.
3.2.2 asphalt state of peptization, n—a measure of the
1.5 This international standard was developed in accor-
ability of the combination of a maltene solvent and dispersed
dance with internationally recognized principles on standard-
asphaltenes to form a stable dispersed system.
ization established in the Decision on Principles for the
3.2.3 colloidal suspension, n—an intimate mixture of two
Development of International Standards, Guides and Recom-
substances, one of which, called the dispersed phase (or
mendations issued by the World Trade Organization Technical
colloid), is uniformly distributed in a finely divided state
Barriers to Trade (TBT) Committee.
throughthesecondsubstance,calledthedispersionmedium(or
dispersing medium).
2. Referenced Documents
3.2.4 compatibility, n—the state of peptization of an asphalt,
2
2.1 ASTM Standards:
which is measured quantitatively by the Heithaus parameter P.
D8 Terminology Relating to Materials for Roads and Pave-
3.2.5 dispersed phase, n—one phase of a dispersion consist-
ments
ingofparticlesordropletsofonesubstancedistributedthrough
D3279 Test Method forn-Heptane Insolubles
a second phase.
D3666 Specification for Minimum Requirements for Agen-
cies Testing and Inspecting Road and Paving Materials
3.2.6 dispersing medium, n—one phase of a dispersion that
D4124 Test Method for Separation of Asphalt into Four
distributes particles or droplets of another substance, the
Fractions
disperse phase.
3.2.7 flocculation, n—theprocessofaggregationandcoales-
cence into a flocculent mass. See Test Method D3279.
1
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.47 on 3.2.8 Heithaus compatibility parameters, n—three param-
Miscellaneous Asphalt Tests.
eters: asphaltene peptizability (p ), maltene peptizing power
a
Current edition approved Dec. 15, 2019. Published January 2020. Originally
(p ), and asphalt state of peptization (P), measured using
o
approved in 2001. Last previous edition approved in 2014 as D6703 – 14. DOI:
Heithaus titration methods.
10.1520/D6703-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.9 maltene peptizing power, n—the ability of a maltene
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
solvent to disperse asphaltenes, measured by the Heithaus
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. parameter p .
o
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6703−19
4. Summary
...
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: D6703 − 14 D6703 − 19
Standard Test Method for
1
Automated Heithaus Titrimetry
This standard is issued under the fixed designation D6703; 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 describes a procedure for quantifying three Heithaus compatibility parameters that quantify the colloidal
stability of asphalts and asphalt cross blends and aged asphalts.
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 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 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:
D8 Terminology Relating to Materials for Roads and Pavements
D3279 Test Method forn-Heptane Insolubles
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D4124 Test Method for Separation of Asphalt into Four Fractions
D5546D8055 Test Method for Solubility of Asphalt Binders in Toluene by CentrifugeGuide for Selecting an Appropriate
Electronic Thermometer for Replacing Mercury Thermometers in D04 Road and Paving Standards (Withdrawn 2017)
E169 Practices for General Techniques of Ultraviolet-Visible Quantitative Analysis
E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
E644 Test Methods for Testing Industrial Resistance Thermometers
3. Terminology
3.1 Refer to Terminology D8 for definitions of terms relating to materials for roads and pavements.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 asphaltene peptizability, n—the tendency of asphaltenes to exist as a stable dispersion in a maltene solvent, measured by
the Heithaus parameter p .
a
3.2.2 asphalt state of peptization, n—a measure of the ability of the combination of a maltene solvent and dispersed asphaltenes
to form a stable dispersed system.
3.2.3 colloidal suspension, n—an intimate mixture of two substances, one of which, called the dispersed phase (or colloid), is
uniformly distributed in a finely divided state through the second substance, called the dispersion medium (or dispersing medium).
3.2.4 compatibility, n—the state of peptization of an asphalt, which is measured quantitatively by the Heithaus parameter P.
1
This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.47 on
Miscellaneous Asphalt Tests.
Current edition approved June 1, 2014Dec. 15, 2019. Published July 2014January 2020. Originally approved in 2001. Last previous edition approved in 20132014 as
D6703 – 13.D6703 – 14. DOI: 10.1520/D6703-14.10.1520/D6703-19.
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
---------------------- Page: 1 ----------------------
D6703 − 19
3.2.5 dispersed phase, n—one phase of a dispersion consisting of particles or droplets of one substance distributed through a
second phase.
3.2.6 dispersing medium, n—one phase of a dispersion that distributes particles or droplets of another substance, the disperse
phase.
3.2.7 flocculation, n—the process of aggregation and coalescence into a flocculent mass. See Test Method D3279.
3.2.8 Heithaus compatibility parameters, n—th
...
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