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Functionalization of crumb rubber surface for the incorporation into asphalt layers of reduced stiffness: An overview of existing treatment approaches
University of Bologna, Italy.ORCID iD: 0000-0003-1565-1554
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0003-2008-1832
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0003-1634-6789
University of Bologna, Italy.
2021 (English)In: Recycling, E-ISSN 2313-4321, Vol. 6, no 1, article id 19Article in journal (Refereed) Published
Abstract [en]

The substitution of mineral aggregates with crumb rubber (CR) from waste end‐of‐life tires (ELTs) in the asphalt concretes, has been considered a sustainable paving industry approach. The rubber has been used to construct pavements with proven enhanced resilience and improved durability. However, some issues related to the rubber’s surface adhesion or swelling may arise with these practices and generate complications (binder consumption, temperatures, mixing times). One possible solution to overcome the materials’ compatibility problems is to pre‐treat the CR’s surface before its incorporation into the asphalt mixes to allow a surface functionalization that can enhance coverage and cohesion inside the mixes. The physical treatments using radiations‐based beam are already exploited in the plastic recycling industries avoiding the use of chemicals in con-siderable amounts. Such treatments permit the recovering of large quantities of polymer‐based materials and the enhancement of interfacial properties. This article provides an overview of existing surface treatments of polymers and especially rubber, including gamma ray, UV‐ozone, micro-waves, and plasma. Several studies have shown an overall improvement of the rubber surface’s reactive properties due to contaminant removal or roughness enhancement attributed to cross‐link-ing or scission reactions occurring on the rubber’s surface layer. With those properties, the asphalt mixes’ phase stability properties are increased when the pre‐treated rubber is incorporated. The treatments would permit to increase the CR quantities, yet reduce the layer stiffness, and improve the durability and the sustainability of future advanced road pavements. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Place, publisher, year, edition, pages
MDPI AG , 2021. Vol. 6, no 1, article id 19
Keywords [en]
Asphalt binder, Crumb rubber, Dry process, End‐of‐life tires, Functionalization, Low‐stiffness asphalt concretes, Pavements, Surface treatment
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:ri:diva-52638DOI: 10.3390/recycling6010019Scopus ID: 2-s2.0-85102892311OAI: oai:DiVA.org:ri-52638DiVA, id: diva2:1540712
Note

Funding details: Horizon 2020 Framework Programme, H2020, 765057; Funding text 1: This research was funded by the European Union?s Horizon 2020 research and innova-tion program under the Marie Sk?odowska?Curie grant agreement N? 765057 through SAFERUP! Project.

Available from: 2021-03-30 Created: 2021-03-30 Last updated: 2024-01-19Bibliographically approved

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Makoundou, ChristinaJohansson, KenthWallqvist, Viveca

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