Functionalization of Crumb Rubber Surface for the Incorporation into Asphalt Layers of Reduced Stiffness: An Overview of Existing Treatment Approaches
| Autor: | Cesare Sangiorgi, Christina Makoundou, Viveca Wallqvist, Kenth Johansson |
|---|---|
| Přispěvatelé: | Makoundou C., Johansson K., Wallqvist V., Sangiorgi C. |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Asphalt binder Low‐stiffness asphalt concrete Plastic recycling Surface treatment 0211 other engineering and technologies 02 engineering and technology Surface finish Management Monitoring Policy and Law Pavement 12. Responsible consumption Natural rubber 021105 building & construction General Materials Science Crumb rubber Composite material Functionalization Waste Management and Disposal lcsh:Environmental sciences lcsh:GE1-350 chemistry.chemical_classification Dry proce end-of-life tires End‐of‐life tire Polymer 021001 nanoscience & nanotechnology Durability chemistry Asphalt visual_art visual_art.visual_art_medium Surface modification low-stiffness asphalt concretes 0210 nano-technology |
| Zdroj: | Recycling, Vol 6, Iss 19, p 19 (2021) |
| ISSN: | 2313-4321 |
| DOI: | 10.3390/recycling6010019 |
| Popis: | 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 considerable 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, microwaves, 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-linking 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|