1、Designation:D670319Standard Test Method forAutomated Heithaus Titrimetry1This standard is issued under the fixed designation D6703;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indi
2、cates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes a procedure for quantifyingthree Heithaus compatibility parameters that quantify thecolloidal stability of asphalts and asphalt cross blen
3、ds and agedasphalts.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and f
4、igures)shall not be consideredas requirements of the standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine
5、 the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations is
6、sued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-mentsD3279 Test Method forn-Heptane InsolublesD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspect
7、ing Road and Paving MaterialsD4124 Test Method for Separation of Asphalt into FourFractionsD8055 Guide for Selecting an Appropriate Electronic Ther-mometer for Replacing Mercury Thermometers in D04Road and Paving StandardsE169 Practices for General Techniques of Ultraviolet-VisibleQuantitative Analy
8、sisE563 Practice for Preparation and Use of an Ice-Point Bathas a Reference TemperatureE644 Test Methods for Testing Industrial Resistance Ther-mometers3.Terminology3.1 Refer to Terminology D8 for definitions of terms relat-ing to materials for roads and pavements.3.2 Definitions of Terms Specific t
9、o This Standard:3.2.1 asphaltene peptizability,nthe tendency of as-phaltenes to exist as a stable dispersion in a maltene solvent,measured by the Heithaus parameter pa.3.2.2 asphalt state of peptization,na measure of theability of the combination of a maltene solvent and dispersedasphaltenes to form
10、 a stable dispersed system.3.2.3 colloidal suspension,nan intimate mixture of twosubstances,one of which,called the dispersed phase(orcolloid),is uniformly distributed in a finely divided statethrough the second substance,called the dispersion medium(ordispersing medium).3.2.4 compatibility,nthe sta
11、te of peptization of an asphalt,which is measured quantitatively by the Heithaus parameter P.3.2.5 dispersed phase,none phase of a dispersion consist-ing of particles or droplets of one substance distributed througha second phase.3.2.6 dispersing medium,none phase of a dispersion thatdistributes par
12、ticles or droplets of another substance,thedisperse phase.3.2.7 flocculation,nthe process of aggregation and coales-cence into a flocculent mass.See Test Method D3279.3.2.8 Heithaus compatibility parameters,nthree param-eters:asphaltene peptizability(pa),maltene peptizing power(po),and asphalt state
13、 of peptization(P),measured usingHeithaus titration methods.3.2.9 maltene peptizing power,nthe ability of a maltenesolvent to disperse asphaltenes,measured by the Heithausparameter po.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct resp
14、onsibility of Subcommittee D04.47 onMiscellaneous Asphalt Tests.Current edition approved Dec.15,2019.Published January 2020.Originallyapproved in 2001.Last previous edition approved in 2014 as D6703 14.DOI:10.1520/D6703-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
15、ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was dev
16、eloped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.4.Summary of Test Method4.1 Three 40-mL reaction vials shall be tared(Fig.1).Threesamples of asphalt of weights 0.400 g,0.600 g,and 0.800 gshall be transferred to each of three reaction vials.Toluene(3.000 mL)shall be add
