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EFFECTS OF THE BITUMEN POLAR FRACTIONS ON THE STABILITY OF BITUMEN AQUEOUS DISPERSIONS

The flocculation of aqueous bitumen emulsion during transportation and processing depends mostly on the electrical properties of bitumen-water interface. The aim of this study is to show how such interface is affected by the resins/asphaltenes ratio (r/a) of the bitumen. Our results indicate that the r/a controls the interfacial composition and the stability of the bitumen droplets in a water-continuous medium. Moreover, it is shown that the r/a is primarily responsible for maintaining diffusion of polar components inside the bitumen droplet. Such non-equilibrium behavior of various bitumen polar components takes place during the dispersion manufacturing and/or maturation phase. In this work, the asphaltenes and resins contents of a bitumen series were determined. In addition, the acid-base properties of the same bitumen series were studied by non-aqueous potentiometric titration method. The nature and the amount of acidic and basic functionaliti present in the bitumen were evaluated by comparison with the acid-base model compounds such as carboxylic acid, benzoic acid and pyridine. Furthermore, the interfacial properties of the acidic aqueous bitumen dispersions were studied by contact-angle and zeta potential measurements. The overall results indicate that stable bitumens dispersions are obtained with bitumens having high values of the resins/asphaltenes ratios.