Performance of asphalt mixes with high recycling rates for wearing layers
- Autori: Anita Blasl; Juliane Kraft; Davide Lo Presti; Gaetano Di Mino; Frohmut Wellner
- Anno di pubblicazione: 2016
- Tipologia: Contributo in atti di convegno pubblicato in volume
- OA Link: http://hdl.handle.net/10447/427571
The corresponding paper presents selected results of a research on the feasibility of going toward 100% recycling of asphalt pavements into surface courses through an increasing percentage of RA within the mixes. The research is carried out within a two-year CEDR Transnational Road Research project, AllBack2Pave, led by the Technische Universitaet Dresden (Germany), together with the University of Nottingham (UK) and the University of Palermo (Italy), and finalised in January 2016. The main objectives of the project are - to establish, through laboratory tests on binders and asphalt mixes, whether the use of high rates of RA is feasible in developing mixes with high level of durability, and - to develop a "AllBack2Pave end-user manual” on how to best produce cost-effective and high-quality asphalt mixes with high RA content followed by a sustainability assessment of the practice of using asphalt surface mixes with high recycling rates based on chosen European case studies to identify the most cost-effective solutions, together with their environmental impact over the whole lifecycle of selected road pavements. The paper focus on selected results of laboratory tests conducted for different types of representative asphalt surface mixes with different amounts of reclaimed asphalt as well as for the bitumen extracted from the investigated asphalt mixes. In detail, the thermal cracking resistance of the used bitumen will be analysed and critical temperatures will be given. Regarding the asphalt mixes, the stiffness behaviour and the rutting resistance of all materials will be discussed.