Community Research and Development Information Service - CORDIS

Performance characteristics of hot bituminous mixtures with a high percentage of reclaimed asphalt

Performance aspects of bituminous mixtures with a large percentage of RA is of high interest for the road authorities and contractors. There is indeed a strong demand towards the use of a higher percentage of reclaimed asphalt. Therefore there is a strong need for research in this matter and there is a need to determine the limits of the use of RA with respect to performance or to have guidelines of how performance can be improved.

Within this project BRRC concentrated mostly on the aspects of compactibility and resistance to permanent deformation (rutting). One has to keep in mind that in case of a high percentage of RA, the binder consists of very hard binder from the RA on one hand and on very soft binders on the other hand. Both new and old material are only mixed during a very short period (of the order of seconds).

It is a success of this project that new binders and mixtures could be developed that lead to a good performance on site: good compaction and a very high rutting resistance.

Some of the outcome of the Paramix project leading to improvements in the test methods or changes in the specifications of bituminous mixtures with RA could be incorporated in the future European standards.

Reported by

Belgian Road Research Centre (BRRC)
Woluwedal 42
1200 Brussels
Belgium
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