Incorporating naturally occurring bituminous products from the Democratic Republic of the Congo into hot mix asphalt

Natural bitumen normally occurs in small quantities as deposits on the earth’s surface and its properties are usually significantly different from refined bitumen. This paper reports on the investigation of surface deposits of natural bitumen at several locations in the Democratic Republic of the Congo. The surface deposits were shown to be bituminous in nature, but also containing low boiling point compounds, fine aggregate, filler, vegetable matter and waste materials. Refined bituminous products were successfully manufactured, characterised and incorporated into a Hot Mix Asphalt (HMA) design. The resulting asphalt mixes were comparatively investigated against a standard binder in an identical asphalt mix design containing the same aggregate, grading and binder content. The asphalt mixes compared favourably against the reference mix in terms of rutting resistance and stiffness properties from performance-related laboratory tests.


  • English

Media Info

  • Pagination: 9p
  • Monograph Title: 11th Conference on Asphalt Pavements for Southern Africa: CAPSA15, 16-19 August 2015, Sun City, South Africa

Subject/Index Terms

Filing Info

  • Accession Number: 01597108
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:14AM