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Article

Performance Assessment of Reclaimed Asphalt Pavement (RAP) in Road Surface Mixtures

1
CERIS, Department of Civil Engineering, Architecture and Geo-Resources, Instituto Superior Técnico Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
2
LNEC, National Laboratory of Civil Engineering, Av. Do Brasil 101, 1700-066 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Michele John
Received: 14 April 2021 / Revised: 10 May 2021 / Accepted: 10 May 2021 / Published: 13 May 2021
Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road network requires maintenance to ensure the safety and comfort of its users. RAP is a 100% recyclable material and a useful fit to be re-introduced into another cycle without downgrading its functionality. Despite the current knowledge about the benefits associated with RAP use, it is not yet largely applied in several countries. This paper aims to validate, on the basis of both short- and long-term mechanical behaviours, the application of a bituminous mixture with a high RAP incorporation rate (75%) in road pavement wearing courses. A crude tall oil rejuvenator was used. Both short- and long-term oven ageing procedures were employed to simulate the ageing that occurs during mixture production and in-service life, respectively. The tests for validating the RAP mixture as an alternative solution comprised stiffness, resistance to fatigue, permanent deformation, and determination of the water sensitivity. Furthermore, the RAP bitumen mobilisation degree was evaluated and a mixing protocol was established. In comparison with virgin bituminous mixtures, it was found that, in general, the high RAP mixtures presented similar or better behaviour. The ageing process had a hardening effect namely in terms of stiffness and resistance to permanent deformation, without significant effects on the resistance to fatigue and water damage. View Full-Text
Keywords: ageing; bituminous mixture; mechanical behaviour; RAP; rejuvenator ageing; bituminous mixture; mechanical behaviour; RAP; rejuvenator
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MDPI and ACS Style

Antunes, V.; Neves, J.; Freire, A.C. Performance Assessment of Reclaimed Asphalt Pavement (RAP) in Road Surface Mixtures. Recycling 2021, 6, 32. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020032

AMA Style

Antunes V, Neves J, Freire AC. Performance Assessment of Reclaimed Asphalt Pavement (RAP) in Road Surface Mixtures. Recycling. 2021; 6(2):32. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020032

Chicago/Turabian Style

Antunes, Vítor, José Neves, and Ana C. Freire 2021. "Performance Assessment of Reclaimed Asphalt Pavement (RAP) in Road Surface Mixtures" Recycling 6, no. 2: 32. https://0-doi-org.brum.beds.ac.uk/10.3390/recycling6020032

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