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Rubber- and emulsion-based impact-absorbing paving material produced with cold and dry processes: Laboratory and in-situ study
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. 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.
2023 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 408, article id 133496Article in journal (Refereed) Published
Abstract [en]

Impact-absorbing pavements (IAPs) may be used as novel sidewalks and bike lanes surface layers to decrease fall-related injuries among vulnerable road users (VRUs). Therefore, a cold-made, highly rubberised asphalt mixture (56% recycled rubber in the total volume of the mix) was developed in the laboratory, and the process was then upscaled, permitting its construction on a trial site. Both laboratory and on-site tests facilitated the evaluation of the material’s mechanical properties, impact-absorption capabilities, and frictional behaviour. The field trial enabled a comprehensive assessment of the material’s performance after six months of usage by pedestrians and cyclists on a hybrid segment. Additionally, evaluations were conducted after six, fifteen, and twenty months. The results confirmed the possibility to produce and lay a cold, highly rubberised paving material with valuable impact-attenuation performances. The mechanical analysis has shown the material’s elastic behaviour and its capability to carry uniaxial compression stress leading to a 5% strain of the total height without losing its properties. Furthermore, the critical fall height (CFH) values exhibited a sixfold increase compared to conventional asphalt, thereby reducing the severity of potential injuries. In terms of durability, the pavement’s overall effectiveness remained significant even after six, fifteen, and twenty months of use. The study demonstrated the capability to cover and fill holes and damaged portions using the same rubberised and cold mixture, a crucial aspect concerning the material’s future and maintenance considerations. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 408, article id 133496
Keywords [en]
Asphalt mixtures; Emulsification; Rubber; Cold process; Crumb rubber; Dry process; Fall-related injury; Impact-absorbing; Impact-absorbing pavement; In-Situ Study; Road users; Surface layers; Vulnerable road user; Pavements
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:ri:diva-67678DOI: 10.1016/j.conbuildmat.2023.133496Scopus ID: 2-s2.0-85173287049OAI: oai:DiVA.org:ri-67678DiVA, id: diva2:1811919
Note

The acknowledgements are gratefully given to: Ing. Filippo Venturucci, Prof. Svein Kleiven and the Neuronic KTH group in Sweden who helped to conduct a part of this study, the crumb rubber supplier through the participation of Svensk Däckåtervinning AB and the binders’ suppliers Valli Zabban and Iterchimica whose products were used during this project. The acknowledgement also goes to the city of Imola, Area Blu and C.T.I. for their contribution to the trial site. This research was funded by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement N° 765057 through the SAFERUP! Project.

Available from: 2023-11-14 Created: 2023-11-14 Last updated: 2023-11-14Bibliographically approved

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Makoundou, ChristinaJohansson, KenthWallqvist, Viveca

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