Optimal content of recycling asphalt pavement RAP (VSS2005/452)
Overview
Background & policy context:
Recycling of asphalt pavements started more than 20 ago. Actual pavements could have been recycled twice or even more times. On one hand long life time is required for pavements and on the other hand maximum quantity of recycled asphalt pavement (RAP) should be used.
Therefore, the following subjects will be investigated:
- Change of binder properties after several recycling steps
- Change of aggregate shape through mechanical processing (milling).
- Assessment of actual recycling practice, regarding different types of mix plants
- Influence of binder type and rejuvenating agents.
The purpose of this research project lies in the ecological and social need for sustainable pavements and closed cycles of matter.
Objectives:
The goal of the research project is to evaluate a base for the determination of an optimum percentage of RAP in the production of different asphalt mix types making sure that high pavement quality and long term performance is still guaranteed. The reservation against the use of asphalt mixes containing RAP will be reduced by demonstrating that such mixes are still standard conform and well performing.
Methodology:
Testing Methods
- Heat behaviour, resistance to deformation
- Stiffness attempt / module
- Rut test
- Pressure threshold attempt
- Fatigue behaviour
- 4-point bending (SN)
- Low-temperature behaviour
- Train-swell trial
- Aging
- Marshall sample, 120 h / 85 ° C
- Water sensitivity
- Indirect tensile test before / after immersion in water
- Inhomogeneity of the binder
- Thin section examination
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