Evaluation of recycled asphalt mixtures with different RAP contents and the effect of recycling agent

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Author(s):	Suzuki, Karina ; Vasconcelos, Kamilla ; Klinsky, Luis Miguel ; Bessa, Iuri Total Authors: 4
Document type:	Journal article
Source:	Road Materials and Pavement Design; v. N/A, p. 13-pg., 2023-03-25.
Abstract
This research evaluated recycled asphalt mixtures (RAMs) for application as wearing course in heavy traffic highways. The main objectives were to investigate the effect of different RAP contents and the effect of a recycling agent (RA) on the mechanical properties of RAMs. Recycled asphalt mixtures with low (10, 20 and 25%) and high (35, 50 and 65%) RAP contents were evaluated. Two of these mixtures (25 and 50% RAP content) were also evaluated after the addition of the RA. The results indicate that conditioning the RAP during the production of RAMs influences the RAP binder activation and the mechanical behaviour of the mixtures. RAMs with high RAP contents presented better resistance to permanent deformation and resulted in satisfactory resistance to fatigue cracking due to the activation of the RAP asphalt binder. Finally, the addition of the RA improved fatigue resistance for higher amounts of RAP without reducing rutting resistance. (AU)

FAPESP's process:	17/25708-7 - Rheology and chemistry of asphalt binders and biobinders: tools to the comprehension of mechanical behavior, aging and deterioration of pavements
Grantee:	Kamilla Vasconcelos Savasini
Support Opportunities:	Research Grants - Young Investigators Grants