ABSTRACT
The results of determination of the bitumen beams deflection using the bending beam rheometer (BBR) were used to calculate the deformation caused by static loading (the creep phenomenon) and after unloading (the recovery phenomenon). The Burgers and Burgers-Kelvin (Burgers model connected with the Kelvin element in series) rheological models were applied for mathematical description of the creep and recovery phenomena. The test results of the Gilsonite and Trinidad Epuré modified asphalt binders both investigated before and after the short-term and long-term aging processes have been subjected to modeling. In order to check the quality of approximation by using rheological models, the following statistical parameters were calculated: coefficient of determination R 2, root mean square deviation and sum of squares of deviations. The results of modeling indicate a very good approximation obtained by using the applied models in reference to the values gained in the laboratory experiment (R 2 > 0.99).
