Title | Pyrolytic oil from waste tyres as a promising encapsulated rejuvenator for the extrinsic self-healing of bituminous materials |
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ID_Doc | 7864 |
Authors | Norambuena-Contreras, J; Arteaga-Pérez, LE; Concha, JL; Gonzalez-Torre, I |
Title | Pyrolytic oil from waste tyres as a promising encapsulated rejuvenator for the extrinsic self-healing of bituminous materials |
Year | 2021 |
Published | |
Abstract | Extrinsic self-healing of bituminous materials using encapsulated rejuvenators is a hot topic within road materials. Based on a circular economy vision for more sustainable and resilient asphalt pavements, this study explores for the first time the use of pyrolytic oil from waste tyres as a promising encapsulated rejuvenator to promote the extrinsic self-healing in bituminous materials. Pyrolytic oil-in-water emulsions, and capsules and their components were produced and characterised through gas chromatography-mass spectrometry (GC/MS) and SARA fractions analysis, fluorescence microscopy methods, creaming index, thermogravimetric analysis (TGA-DGT), optical and scanning electron microscopy (SEM), encapsulation efficiency and mechanical properties. Main results showed that the pyrolytic oil capsules presented an adequate morphology for the self-healing asphalt, with a good thermal stability, physical-chemical and mechanical properties. Overall, it was also proven that the pyrolytic oil is a rejuvenator that can diffuse in the aged bitumen reducing its viscosity to promote the self-healing of the microcracks. |