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Evaluation of Asphalt Mixtures Containing Metallic Fibers from Recycled Tires to Promote Crack-Healing
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Jose Norambuena-Contreras ,
Lily Poulikakos,
María José Varela,
Jonathan Valderrama,
Alexander Flisch ,
Martín Arraigada
Materials, Volume: 13, Issue: 24, Start page: 5731
Swansea University Author:
Jose Norambuena-Contreras
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DOI (Published version): 10.3390/ma13245731
Abstract
AbstractThis paper reports part of an international research project with the long-term aim of developing more sustainable asphalt mixture with crack-healing properties by the addition of recycled metallic waste from industrial sources. Specifically, this article presents an evaluation of the physic...
| Published in: | Materials |
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| ISSN: | 1996-1944 |
| Published: |
MDPI AG
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66782 |
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| Abstract: |
AbstractThis paper reports part of an international research project with the long-term aim of developing more sustainable asphalt mixture with crack-healing properties by the addition of recycled metallic waste from industrial sources. Specifically, this article presents an evaluation of the physical, thermophysical, and mechanical properties of asphalt mixtures with metallic fiber obtained from recycled tires for crack-healing purposes. Detailed results on the crack-healing of asphalt mixtures will be reported in a second article. Results showed a small reduction on the bulk density and increase in the air voids content was quantified with increasing fiber contents. The experimental results showed that mixing and compaction was more difficult for higher fiber contents due to less space for the bitumen to freely flow and fill the voids of the mixtures. Computed tomography (CT) results allowed to identify clustering and orientation of the fibers. The samples were electrically conductive, and the electrical resistivity decreased with the increase of the fiber content. Fiber content had a direct effect on the indirect tensile stiffness modulus (ITSM) and strength (ITS) that decreased with increasing temperature for mixtures and with increase in fiber content. However, the indirect tensile strength ratio (ITSR) was within acceptable limits. In short, results indicate that fibers from recycled tires have a potential for use within asphalt mixtures to promote crack-healing. |
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| Keywords: |
asphalt mixture; metallic fibers; waste tires; crack-healing; computed tomography |
| College: |
Faculty of Science and Engineering |
| Funders: |
Authors acknowledge the financial support given by the Leading House for the Latin American Region, Universität St. Gallen, Switzerland through the Seed Money Grant (SMG) project 1801. |
| Issue: |
24 |
| Start Page: |
5731 |