ASTM D6703-07

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).