A Two Parameter Correlation for Petroleum Bitumens

The viscosity data for a number of bitumen samples obtained from Russian crudes have been correlated. The model equation of viscosity with softening point contains two empirical parameters which were determined by linear regression method by the use of a computer. The viscosity of the 71 samples at 140°C varied from 37.6 to 80,000 mPa.s for the softening point range of 36 to 90°C respectively. The empirical equation gave a very good representation of the softening point -viscosity relationship for the range of bitumens of 40-60°C softening point. The average absolute deviation and the standard error were less than 8% over a wide softening point range.