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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 and 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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D8 Terminology Relating to Materials for Roads and Pavements
D3279 Test Method for n-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
D8055 Guide for Selecting an Appropriate Electronic Thermometer for Replacing Mercury Thermometers in D04 Road and Paving Standards
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
ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D6703-19, Standard Test Method for Automated Heithaus Titrimetry, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top