Pavement Recycling in REAAA and Proposal of New Aging Evaluation Method

A questionnaire on pavement recycling status in Road Engineering Association of Asia and Australaysia (REAAA) member countries revealed that plant recycling and in-situ recycling methods are widely used in the region. Most nations use reclaimed asphalt pavement (RAP) materials, while some apply unrecyclable concrete debris into base layering projects. In-situ recycling is found to be user-friendly, as it is mainly used on base layers, which do not require shipping out existing materials from the field. Technical problems for plant recycling include difficulty in quality control for RAP materials, extraction of bitumen from modified AC materials and others. These issues are summarized to how to assess the level of aging of existing AC materials. If this can be conducted at plant directly from sampled cores, RAP recycling is expected for further promotion. In anticipation of this need, Japan had successfully developed a new aging evaluation method; AC field cores being mounted on a Marshall apparatus can be directly tested for its tensile-based strength. Penetration-based aging level can be switched by developing a confirmed relation between the strength and the extracted bitumen’s penetration. Since this new method can do without bitumen’s extraction and does not need an expensive device, it is expected to help promote RAP recycling in the member countries. The simple, easy, not time-consuming and environmentally friendly method may be widely welcomed in wider regions. This paper presents a series of the questionnaires on recycling in the Asian region, the concept and theory of the new alternative aging evaluation method, and laboratory data to validate the effectiveness.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 9p
  • Monograph Title: Proceedings of the 25th World Road Congress - Seoul 2015: Roads and Mobility - Creating New Value from Transport

Subject/Index Terms

Filing Info

  • Accession Number: 01689018
  • Record Type: Publication
  • ISBN: 9782840604235
  • Files: TRIS
  • Created Date: Dec 12 2018 10:27AM