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Mechanical and leaching characterisation of impact-absorbing rubberised asphalts for urban pavements
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. University of Bologna, Italy.ORCID iD: 0000-0003-1565-1554
Coventry University, UK; University of Strathclyde, UK.
KTH Royal Institute of Technology, Sweden.
Coventry University, UK.
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2023 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 56, no 3, article id 55Article in journal (Refereed) Published
Abstract [en]

A new impact-absorbing material is being developed to protect vulnerable road users in urban areas and has been produced and tested, mechanically and environmentally in the laboratory. The main constituent of this innovative material is the rubber recycled from end-of-life tyres to foster a circular use of resources and exploit rubber’s elastic properties. The study aims to provide a complete Uniaxial Compression Test (UCT) and leaching analysis of the material to propose and optimise a mix that is mechanically sound, durable, and respectful of the environment, in view of in-situ applications. Therefore, the UCT and Dynamic Surface Leaching Test (DSLT) were carried out on rubberised asphalt specimens with different mix designs. The 64 days cumulative concentrations of leached heavy metals and trace elements from unit surface of specimens were calculated and quantified, according to the CEN/TS 16637 standard. In parallel, thanks to a specific mechanical characterisation, compressive stress–strain curves were obtained, and the relaxation and elastic modulus were evaluated. The results from the compression tests showed that the A-mixes have the best elastic and absorbing behaviour, especially those made with an SBS-modified bituminous emulsion (A4). The results from DSLT showed that the cumulative concentration of released elements, per unit surface of specimens were lower than the Dutch Soil Quality Decree (SQD) thresholds, taken as a reference. The low and early release of leachant observed for the mixtures, especially A4 as the most promising one, leave the possibility to handle the leaching with several solutions, including rubber coating treatment or water washing before their incorporation into the mix to limit and prevent their leaching while permitting very high injury reduction performances. © 2023, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2023. Vol. 56, no 3, article id 55
Keywords [en]
Cold and warm mixtures, Crumb rubber, Dynamic surface leaching, Impact-absorbing pavement, Rubberised asphalt mixtures, Uniaxial compression tests, Asphalt mixtures, Compaction, Compression testing, Dynamics, Emulsification, Heavy metals, Leaching, Rubber, Rubber coatings, Soil testing, Trace elements, Cold and warm mixture, Dynamic surface, Impact-absorbing, Rubberized asphalt, Rubberized asphalt mixture, Uni-axial compression tests, Warm mixtures, Pavements
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:ri:diva-64321DOI: 10.1617/s11527-022-02078-5Scopus ID: 2-s2.0-85150932407OAI: oai:DiVA.org:ri-64321DiVA, id: diva2:1755312
Note

Funding details: Horizon 2020 Framework Programme, H2020; Funding details: H2020 Marie Skłodowska-Curie Actions, MSCA, 765057; Funding details: Università di Bologna, UNIBO; Funding text 1: The authors are grateful to the crumb rubber (through the participation of Svensk Däckåtervinning AB) and bituminous binders’ suppliers used during this study and to Ing. Filippo Venturucci for his contribution to the testing phase.; Funding text 2: Open access funding provided by Alma Mater Studiorum - Università di Bologna within the CRUI-CARE Agreement. This research was funded by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No 765057 through SAFERUP! Project.

Available from: 2023-05-08 Created: 2023-05-08 Last updated: 2023-11-01Bibliographically approved

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