| Autor: |
Anne Dony, Layella Ziyani, Fayçal Lahjiri, Virginie Mouillet, François Henn, Sabine Gazeau, Frédéric Delfosse |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Lecture Notes in Civil Engineering ISBN: 9783030297787 |
| DOI: |
10.1007/978-3-030-29779-4_4 |
| Popis: |
The current challenge is to produce asphalt mixtures incorporating higher rates (>50%) of Reclaimed Asphalt (RA) while controlling the quality of the final mix. During the service life of a pavement properties change, mainly due to oxidation and need to be restored. The resulting mix must exhibit at least equivalent performances regarding the mechanical and durability properties compared to that from a mix without RA. Hence, recycling agents are sometimes employed to “rejuvenate” aged bitumen. In this study, three recycling agents were used on both RA and neat bitumens, displaying different compositions. The effects on unaged and aged blends were assessed through rheology tests using Dynamic Shear (DSR) and Bending Beam (BBR) Rheometers. Data from DSR obtained with 4 mm and 8 mm parallel plates allowed to calculate the Glover-Rowe criteria and to determine the crossover parameters whilst BBR measurements yield Tm, Ts and ΔTc parameters. The blends resulting from the two bitumens displayed a similar evolution of behavior. This outcome suggests that these tests cannot discriminate the origin of the rejuvenation phenomenon since they only highlight the softening effect of the recycling agent and not its impact at the molecular level, i.e. on asphaltene and maltene compounds. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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