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Abstract
Considering asphalt as a mixed system composed of multiple solid and liquid phases based on the principle of phase equilibrium and regular solution theory, in this paper, the activity coefficient was used to describe the non-ideality of solid and liquid phases. According to the phase equilibrium equation, mass equilibrium equation, and normalization equation, the solid–liquid fraction under the equilibrium condition was calculated, and then the precipitation temperature of paraffin wax in asphalt and the precipitation amount at each temperature were determined. The gas chromatography-mass spectrometry experiment was conducted to measure the paraffinic, naphthenic and aromatic distribution of the asphalt as the input parameter of the prediction model. After the calculation results of the wax precipitation temperature (WPT) and wax precipitation curve (WPC) were compared with measured values acquired from experimental methods (viscosity method, Fourier-transform infrared spectroscopy (FTIR) method), it was found that the trend of WPC is approximately similar, but the WPT of the theoretical model was significantly higher than that of FTIR. The authors believe that this was caused by the overestimation of the thermodynamic properties of the aromatic components. After reducing the melting point and enthalpy of the aromatic components to a certain extent, satisfactory results were obtained.
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