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Influence of the Microwave Heating Time on the Self-Healing Properties of Asphalt Mixtures
,
Irene Gonzalez-Torre
Applied Sciences, Volume: 7, Issue: 10, Start page: 1076
Swansea University Author:
Jose Norambuena-Contreras
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DOI (Published version): 10.3390/app7101076
Abstract
This paper aims to evaluate the influence of the microwave heating time on the self-healing properties of fibre-reinforced asphalt mixtures. To this purpose, self-healing properties of dense asphalt mixtures with four different percentages of steel wool fibres were evaluated as the three-point bendi...
| Published in: | Applied Sciences |
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| ISSN: | 2076-3417 |
| Published: |
MDPI AG
2017
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66809 |
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| Abstract: |
This paper aims to evaluate the influence of the microwave heating time on the self-healing properties of fibre-reinforced asphalt mixtures. To this purpose, self-healing properties of dense asphalt mixtures with four different percentages of steel wool fibres were evaluated as the three-point bending strength before and after healing via microwave heating at four different heating times. Furthermore, the thermal behaviour of asphalt mixtures during microwave heating was also evaluated. With the aim of quantifying the efficiency of the repair process, ten damage-healing cycles were done in the test samples. In addition, self-healing results were compared with the fibre spatial distribution inside asphalt samples evaluated by CT-scans. Crack-size change on asphalt samples during healing cycles was also evaluated through optical microscopy. It was found that the heating time is the most influential variable on the healing level reached by the asphalt mixtures tested by microwave radiation. CT-Scans results proved that fibre spatial distribution into the asphalt mixtures play an important role in the asphalt healing level. Finally, it was concluded that 40 s was the optimum heating time to reach the highest healing levels with the lowest damage on the asphalt samples, and that heating times over 30 s can seal the cracks, thus achieving the self-healing of asphalt mixtures via microwave heating. |
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| Keywords: |
self-healing; asphalt mixture; metallic fibres; microwave heating; heating time |
| College: |
Faculty of Science and Engineering |
| Funders: |
The authors want to thank the financial support given by the National Commission for Scientific & Technological Research (CONICYT) from the Government of Chile, through the Research Project FONDECYT Initiation 2014 No. 11140103. In addition, the authors would also like to acknowledge the experimental help provided by Eng. José L. Concha from LabMAT and the bachelor student Manuel Riffo, from the Department of Civil and Environmental Engineering, both from the University of Bío-Bío. Finally, the authors also want to thank Ricardo Serpell from PUC-Chile for his help with the CT-Scan tests. |
| Issue: |
10 |
| Start Page: |
1076 |