Sustainability assessment of roads containing reclaimed asphalt pavement - Decision support based on life cycle assessment & life cycle cost analysis during road design.

Recycling reclaimed asphalt pavement (RAP) in new roads ensures a circular approach and increases the sustainability. In general, there are three applications for RAP: asphalt mixtures, cement bound base layer mix and unbound material. However, the selection process for any application is currently not optimized. Recent laboratory research also shows that the addition of RAP in new structures does not negatively affect the mechanical properties if the mixture and/or the structural design is optimized. However, it is important to note that these optimizations can have a major impact on the economic and environmental impact of our roads. Therefore, it is important to assess these effects at an early stage so that the most sustainable solution can be chosen. This research will implement life cycle assessment (LCA) and life cycle cost analysis (LCCA) in road design to analyse the environmental and economic impact of the use of RAP in new roads. The first part will focus on the recycling potential of RAP. It will optimize the recycling process and determines the salvage value of RAP as a resource. Next, RAP will be used in a new cycle and the impact on the whole life cycle of roads will be examined. Finally, the LCA and LCCA will be combined and an optimization process will be designed which can be implemented in road design so the most sustainable material flow for RAP can be determined.

Keywords:LIFE CYCLE ASSESSMENT, RECYCLING, ROAD CONSTRUCTION SECTOR, SUSTAINABILITY

Disciplines:Construction materials, Infrastructure engineering and asset management, Life cycle analysis of construction materials, Environmental and sustainable planning, Life cycle engineering, Recycling, Materials recycling and valorisation