Development of a self-healing asphalt road via induction heating

In asphalt roads, cracking damage can lead to failure. This effect is increased by numerous defects in pavements structures as a result of either construction or a combination of aging and traffic- and thermal-induced distresses. It is around, these imperfections that stress concentrates allowing micro-cracks initiation and propagation. Under repetitive loading, these micro-cracks can grow and eventually, combine to large cracks transverse or perpendicular to the driving direction. Nevertheless, it is known that asphalt materials show natural or self-healing characteristics. This effect is very slow at ambient temperature thus, it should be necessary to stop the traffic circulation in order to give the road time to heal. Likewise, it is reported that the rate of natural healing increases with an increase in temperature. In this context, the use of induction heating may be considered as a healing technique to increase the life of an asphalt concrete pavement. This experimental concept involves the addition of electrically conductive and/or magnetic materials (metallic particles or fibers) as additives into the asphalt mixture. Then, an alternating electromagnetic field can be generated by using an induction heating device for heating the particles. Afterwards, through heat conduction, the bitumen around these conductive additives will be heated decreasing its viscosity, eventually flowing and closing cracks nearby as well as recovering the adhesive bonds with the mineral aggregates. The aim of this research project was to develop a self-healing asphalt road via induction heating. For that purpose, the influence of different conductive additives on the properties of the modified asphalt mixtures was analysed in order to know the advantages and/or limits of this innovative approach. Moreover, the healing performance was evaluated obtaining significant conclusions related to the importance of thermal, rheological and chemical properties of the bitumen. Finally, the feasibility of the healing concept for asphalt roads was analysed at large scale by simulating the effect of real traffic on the deterioration of a pavement

  • Corporate Authors:

    BUNDESAMT FUER STRASSENBAU (ASTRA) / OFFICE FEDERAL DES ROUTES (OFROU)

    MUEHLESTRASSE 2, ITTIGEN
    BERN,   Switzerland  CH-3003
  • Authors:
    • PARTL, M
    • BUENO, M
  • Publication Date: 2015-12

Language

  • English

Media Info

  • Pagination: 96P
  • Serial:
    • Issue Number: 1547

Subject/Index Terms

Filing Info

  • Accession Number: 01595898
  • Record Type: Publication
  • Source Agency: Ecole Polytechnique Fédérale de Lausanne (EPFL)
  • Files: ITRD
  • Created Date: Apr 11 2016 4:55PM