Abstract
A modeling approach is presented for the mixture viscosity of dileunt-bitumen blends as a function of temperature and composition. The proposed model is based on the Walther (or ASTM) two-parameter viscosity-temperature correlation and a simple (additive) viscocity mixing rule. Four sets of published viscosity-temperature-composition data are represented well by the viscosity correlation. The liquid-mixture viscosity predictions, from the simple viscosity mixing rule, are well within an order-of-magnitude of the data. The blend viscosity predictions are improved substantially by introducing a temperature-dependent viscous interaction parameter. The results show that the viscosity mixing rule can be used for calculating the viscosity of bitumen-diluent blends over a wide range of temperatures.
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