Durable wearing course for bituminous pavements

A good wearing course is necessary for the protection of flexible pavement to make it durable. While a wearing course of surface dressing has been known for its durability all over the world on low volume roads, the wearing course of premix carpet and seal coat is very common in India through frequent pothole repair, and patching well within five years of construction are not uncommon. Conventional bituminous concrete wearing course in the hot climate of India has not been performing well on heavy volume highways with life not extending three years, due to the brittleness caused by faster oxidation of the binder. Bituminous concrete with crumb rubber modified bitumen (CRMB) also has a success rate of less than 50%, as per the survey by the senior author. Polymer modified bitumen (PMB) is less common because of higher cost, but it was reported to last longer, though isolated cases of failure within five years have also been reported. The paper presents an investigation on different types of wearing course of bituminous mixes to examine their likely field performance and suggest wearing courses which may last longer. Binders, such as VG30, VG40 and CRMB and PMB with dense and gap gradations were used in the investigations. It was found that high binder gap gradation bituminous mixes even with CRMB binder have a good chance to provide a long lasting low maintenance crack and rut free wearing surface on high volume highways, rather than dense graded bituminous concrete with conventional binder. Cost implication and environmental issues are also discussed.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Saboo, Nikhil
    • Reddy, M A
    • Pandey, B B
  • Publication Date: 2014-5


  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 19-28
  • Serial:
    • Indian Highways
    • Volume: 42
    • Issue Number: 5
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01528588
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 9 2014 11:35AM