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An Examination of Property Changes of Repeatedly Recycled Asphalt Bitumen Using Rejuvenator with High Aromatic Content

  • Atsushi KawakamiEmail author
  • Yoko Kawashima
  • Hiroyuki Nitta
  • Masayuki Yabu
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 20)

Abstract

In Japan, recycling of asphalt mixtures has been practiced for more than 40 years. Since the mixing ratio of recycled aggregate is increasing every year, use of asphalt mixtures containing repeatedly recycled aggregate is expected to increase. However, sufficient knowledge regarding the repeated recycling has not been accumulated, and no clear understanding of the changes has been established. In this study, asphalt bitumen was aged in a laboratory and then applied a rejuvenator to restore its penetration in order to understand the property changes occurring in repeatedly aged and recycled asphalt bitumen and asphalt mixtures. This process was repeated multiple times and thereby an understanding of the properties of recycled asphalt materials was gained. In the results, although recycled asphalt bitumen recovered its penetration, its softening point shifted to a higher-temperature range in third recycling. Ductility only reached a level less than half of the initial ductility even after the first recycling process. Moreover, it was revealed that ductility exhibited almost no improvement in and after third recycling. In the black diagram curves from the DSR test, the phase angle transitioned to a smaller value range when asphalt bitumen progressed to recycle three times and five times.

Keywords

Asphalt bitumen Repeated recycling Rejuvenator Asphalt mixture 

References

  1. Japan Asphalt Mixture Association: Annual Report on Asphalt Mixtures (2016)Google Scholar
  2. Japan Road Association: Handbook on Pavement Survey and Test Methods, June 2007Google Scholar
  3. Kawashima, Y., Nitta, H., Kawakami, A., Nishizaki, I.: Evaluation of the chemical properties of repeatedly recycled asphalt binder. In: The 32nd Japan Road Conference, vol. 3056, October 2017Google Scholar
  4. Ministry of Land, Infrastructure, Transport and Tourism: Annual Report on Road Statistics 2016 (2016). http://www.mlit.go.jp/road/ir/ir-data/tokei-nen/index.html. Accessed 26 Apr 2018
  5. Yamaguchi, K., Sasaki, I., Meiarashi, S.: The aging of asphalt materials by ultraviolet-rays radiation and the effects of carbon black. J. Pavement Eng. 8, 251–260 (2003)CrossRefGoogle Scholar

Copyright information

© RILEM 2019

Authors and Affiliations

  • Atsushi Kawakami
    • 1
    Email author
  • Yoko Kawashima
    • 1
  • Hiroyuki Nitta
    • 1
  • Masayuki Yabu
    • 1
  1. 1.Public Works Research InstituteTsukubaJapan

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