Significance and Use

This test method is intended primarily as a laboratory diagnostic tool for estimating the colloidal stability of asphalt, asphalt cross blends, aged asphalt, pyrolyzed asphalt, and heavy oil residuum. Historically, asphalt and heavy oil residua have been modeled as colloidal suspensions (8,9) in which a polar, associated asphaltene moiety (the dispersed phase) is suspended in a maltene solvent moiety (the dispersing medium) (refer to test methods D 3279 , D 4124 , and D 5546 for further definition of asphalt fraction materials). The extent to which these two moieties remain in a given state of peptization is a measure of the compatibility of the suspension. Compatibility influences important physical properties of these materials, including rheological properties, for example, phase angle and viscosity (10,11) . Compatibility also influences coke formation in refining processes (4) . This test method and other similar test methods (7, 12-15) , along with the classical Heithaus test (1,2) , measures the overall compatibility of a colloidal system by determining a designated parameter referred to as the state of peptization, P . The value of P commonly varies between 2.5 and 10 for unmodified or neat asphalts. Materials calculated to have low values of P are designated as incompatible, where as materials calculated to have high P values are designated as compatible. Values of P may be calculated as a function of two other designated parameters that relate to the peptizability of the asphaltene moiety (the asphaltene peptizability parameter, p _a ) and the solvent power of the maltene moiety (the maltene peptizing power parameter, p _o ). Values of p _a and p _o are calculated as functions of the quantities C _min and FR _max , the values of which are obtained from three experimental variables, the weight of residuum or asphalt ( W _a ), the volume of solvent ( V _S ), and the volume of titrant added up to the flocculation point ( V _T ).

1. Scope

1.1 This test method describes a procedure for quantifying three Heithaus compatibility parameters (1,2) that estimate the colloidal stability of asphalts and asphalt cross blends (1,2) , aged asphalts (3) , and pyrolyzed heavy oil residua and asphalt (4) using automated Heithaus titrimetry as a stability diagnostic tool.

1.2 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 and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D3279 Test Method for n-Heptane Insolubles

D4124 Test Method for Separation of Asphalt into Four Fractions

D5546 Test Method for Solubility of Asphalt Binders in Toluene by Centrifuge

E169 Practices for General Techniques of Ultraviolet-Visible Quantitative Analysis

Keywords

sphalt; bitumen; coke; colloidal stability; compatibility; heavy oil residua; Asphalts; Colloidal stability; Compatibility; Heavy oil residua; Heithaus titrimetry;

ICS Code

ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)

DOI: 10.1520/D6703-07

ASTM International is a member of CrossRef.

ASTM D6703