ABSTRACT
Mastic asphalt (MA) mixes are produced at high temperatures (230°C to 250°C) to decrease the viscosity of the bitumen. High production temperatures lead to an increased energy demand and higher emissions of greenhouse gases. This paper presents the results for mechanical performance of temperature reduced MA. A reference MA is compared to temperature reduced MAs: a currently used reduction by modification with wax and an alternative new method by substituting crushed by round aggregates. Both methods realize a maximum temperature drop by 30°C. In addition, a combination of wax modification and round aggregates is investigated, which may achieve a reduction of 50°C. The results show that the resistance to permanent deformation is not decreased by using round aggregates and that it can be doubled by employing wax regardless of the aggregate shape. Resistance to low-temperature cracking is affected by neither of the employed methods for temperature reduction.
