Laboratory assessment of new technical solutions for mastic asphalt with reduced mixing temperature
Digital Object Identifier (DOI): dx.doi.org/10.14311/EE.2016.350
Mastic asphalt is still an important type of asphalt mix used in several European countries especially for applications on bridge pavement structures as a waterproofing layer or even binder/wearing course. Similarly it is used for tram tracks to fix the structure in the existing road. Last but not least it is used for trafficked areas with heavy loading or very low traffic speed (parking garages, storage areas etc.). Since REACH was introduced to European legislation and bitumen including its applications was registered there is an ongoing effort to reach mastic asphalt variants where the processing temperature would be at maximum 200°C. Within the research activities of Centre for Effective and Sustainable Traffic Infrastructure, which is the only R&D centre of competence financed in this area by the Czech government a subtask was done with focus on different possibilities to design and assess mastic asphalt with reduced processing temperature. Besides the known waxes which are used since many years, some new alternatives were tested. Additionally also a surfactant and additives based on sugar cane extracts were included as well as some less known wax based additives. Firstly bitumen (20/30) treated by these additives was analysed by standard empirical tests and mainly performance based test focusing on dynamic viscosity, MSCR test and frequency sweep test on DSR. For some additives different ratios were applied to discuss the impact of such additive. In the second stage mastic asphalt MA11 (eventually MA8) was produced in the laboratory with assessment of workability given in Czech technical standards and the stiffness test according to the EN standard. Especially because of the bridge deck applications also the rip-off test was done. The mixes were produced by different temperatures to analyse the effect of the used additives in the binder.
Additives, Asphalt, Low-Temperature, Mastic Asphalt, Workability