On the degree of binder activity of reclaimed asphalt and degree of blending with recycling agents
Authors
Lo Presti, DavideVasconcelos, Kamilla
Orešković, Marko
Menegusso Pires, Gustavo
Bressi, Sara
Article (Accepted Version)
Metadata
Show full item recordAbstract
It is common practice to assume full blending of the aged binder of reclaimed asphalt (RA) within the design of new asphalt mixtures. Although being practical, this assumption has often led designers to asphalt mixtures lacking binder. Hence, going towards recycled asphalt mixtures (RAM) there is a need to have a better understanding of the blending phenomena, to have a general agreement on terminology and finally adapting RA classification and mix design procedures accordingly. This manuscript aims at being both a reference and stimulus for the scientific community to work in this direction and on this basis provides a nomenclature and a theoretical framework of the blending phenomena. The study is built upon a literature review on definitions, methods and influencing factors related with the blending phenomena and as a result, an intrinsic property of RA, the Degree of binder Activity (DoA), is introduced for the sake of improving RA classification. Furthermore, the two well-known co...ncepts of the Degree of Blending (DoB) and the Degree of binder Availability (DoAv) are redefined, within the proposed framework, together with practical suggestions to introduce them in mix design procedures.
Keywords:
degree of activity / degree of blending / degree of availability / recycled asphalt / recycling agent / blending phenomenaSource:
Road Materials and Pavement Design, 2019Publisher:
- Taylor&Francis
Funding / projects:
DOI: 10.1080/14680629.2019.1607537
ISSN: 1468-0629
WoS: 000619925100001
Scopus: 2-s2.0-85065087825
Institution/Community
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