This paper describes the importance of the particle shape of aggregates in road structures, and their determination, especially using the flakiness index test. For crushed aggregate, the particle shape and surface texture depend on the nature of the parent material and on the type of crusher and its reduction ratio. The flakiness index is the weight of flaky particles as a % of the sample weight. Elongation index is defined similarly. The paper discusses: (1) particle shape and its numerical determination; (2) the physical requirements of coarse aggregates, including an illustrative example; (3) the aggregate manufacturing process, including the use of an impactor; (4) the field tests; and (5) the analysis of the field tests, especially the flakiness test and the compactor test. Several tables of results are included. One purpose of the paper is to open a discussion of whether flakiness index values could be raised at par to concrete, without disturbing other physical requirements of aggregate against wet mix macadam construction.

  • Availability:
  • Corporate Authors:

    Indian Roads Congress

    Jamnagar House, Shahjahan Road
    New Delhi,   India  110 011
  • Authors:
    • MOHANTY, K P
  • Publication Date: 1995-2


  • English

Media Info

  • Features: References;
  • Pagination: p. 11-21
  • Serial:
    • Indian Highways
    • Volume: 23
    • Issue Number: 2
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 00720022
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, ATRI
  • Created Date: Apr 26 1996 12:00AM