Microwave crack healing on conventional and modified asphalt mixtures with different additives: an experimental approach

Self-healing asphalt by increasing bitumen temperature using microwave radiation is an effective technique for crack-healing on asphalt mixtures. Normally, these types of asphalt mixtures contain metal additives that promote microwave heating. However, results from the literature suggest that crack-heling would be possible without additives. If this is possible, existing asphalt pavements could be healed by microwave heating. The objective of this research is to evaluate the crack-healing capabilities of conventional asphalt mixtures without metal additives. With this purpose, the authors studied and compared the crack-healing capabilities of conventional asphalt mixtures without metal additives with modified mixtures containing steel fibre, metal shavings, and Silicon Carbide, the last being a novel ceramic material for the crack-healing of asphalt mixtures by microwaves. The authors conducted three-point bending tests on semi-circular asphalt samples to calculate the flexural strength of asphalt. Results of the research showed that the effect of additives that promote microwave heating on the crack-healing of mixtures was a small reduction of the average healing ratio. Additionally, it was found that the effect of additives that promote microwave heating on the surface temperature of samples was either a small increase or small decrease, similar to the effect observed in the healing of mixtures. X-Ray computed tomography results showed that the virgin aggregates used contained metals, which explains the heating and good crack-healing of the reference mixtures. Overall, results of crack-healing tests indicate that asphalt mixtures with aggregates that naturally heat with microwave radiation could be crack-healed without the addition of additives to promote microwave heating.

• Record URL:
  • https://doi.org/10.1080/14680629.2019.1587493
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/14680629
• Supplemental Notes:
  • © 2019 Informa UK Limited, trading as Taylor & Francis Group. Abstract reprinted with permission of Taylor & Francis.
• Authors:
  • González, Alvaro
  • Valderrama, Jonathan
  • Norambuena-Contreras, Jose
• Publication Date: 2019-4

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp S149-S162
• Serial:
  • Road Materials and Pavement Design
  • Volume: 20
  • Issue Number: sup1
  • Publisher: Taylor & Francis
  • ISSN: 1468-0629
  • EISSN: 2164-7402
  • Serial URL: http://www.tandfonline.com/loi/trmp20

Subject/Index Terms

• TRT Terms: Additives; Asphalt mixtures; Asphalt pavements; Cracking of asphalt concrete pavements; Experiments; Heat radiation; Microwaves; Silicon carbide
• Uncontrolled Terms: Healing (Materials); Microwave heating
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01705940
• Record Type: Publication
• Files: TRIS
• Created Date: May 28 2019 9:43AM