Ground tire rubber (GTR) with particles size below 0.8 mm was received from Orzeł S.A. (Poland). GTR was obtained during ambient grinding of the used tires (mix of passenger car tires and truck tires). Road bitumen 160/220 and polymer modified bitumen Modbit 25/55-60 were received from Lotos Asfalt Sp. z o.o. (Poland). Characteristics of the used bitumen is presented in Table 1.