| Title |
Investigating aged binder mobilization and performance of RAP mixtures for surface courses |
| ID_Doc |
27227 |
| Authors |
Antunes, V; Freire, AC; Neves, J |
| Title |
Investigating aged binder mobilization and performance of RAP mixtures for surface courses |
| Year |
2021 |
| Published |
|
| DOI |
10.1016/j.conbuildmat.2020.121511 |
| Abstract |
Pavement engineering practice still deals with a set of restraints regarding the use of RAP, mainly in the case of bituminous surface courses. The main objectives of this paper are to assess: (a) the influence of the rejuvenator and the degree of aged binder mobilization on the homogeneity of bituminous mixtures; and (b) the performance and durability of bituminous mixtures for surface courses with 25% RAP. The laboratory investigation studied an AC 14 surf 35/50 considering two mixture compositions: a reference mixture with virgin constituents; and a mixture containing RAP and a rejuvenator agent. The study was focused on the mechanical and functional behaviours, as well as on the short- and long-term ageing performance of mixtures. An experimental protocol for RAP fractioning and rejuvenator addition was established to achieve a better control of the final mixture quality. The aged binder mobilization was more efficient when RAP was heated. The RAP mixture revealed a good performance in terms of permanent deformation, water sensitivity, stiffness, and fatigue. The incorporation of fractionated RAP allowed to have a mixture with good surface characteristics. Aged RAP mixture performance envisioning good long-term behaviour. Regarding the promotion of the circular economy, this investigation clearly demonstrated that mixtures with a 25% RAP incorporation can be currently used in surface courses. (C) 2020 Elsevier Ltd. All rights reserved. |
| Author Keywords |
RAP; Recycling; Binder mobilization; Performance; Surface courses; Circular economy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000608038400013 |
| WoS Category |
Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary |
| Research Area |
Construction & Building Technology; Engineering; Materials Science |
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