Some data from an asphaltic concrete construction were collated and the overall variabilities for some 22 variables have been estimated for each of four different mix designs. The variables studied included aggregate grading, bitumen content, Marshall properties (stability, flow, etc), theoretical maximum density and field density. Based on results achieved on this construction, the need for routine testing for Marshall properties is discussed and, as a result, does not seem to be warranted for the one type of material if the appropriate control of mix composition is maintained. The need to perform daily Marshall density testing for acceptance purposes of field density is also considered and does not seem necessary provided that certain conditions are met regarding the number of initial laboratory tests and the accuracy to which their mean and the daily field mean density are recorded. On the other hand, it is suggested that acceptance testing of field density be carried out at random over the full design width of the pavement, without exclusion of joints or edges, where thickness requirements should be achieved. Different approaches to statistically-based specifications are suggested for control of mix composition variables employing known variability schemes with lower and upper specification limits on the mean relative to design requirements and a target standard deviation, and, for control of relative compaction using unknown variability schemes relative to a nominated minimum value. The number of the covering abstract for the conference is TRIS No. 393385. (Author/TRRL)

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  • Supplemental Notes:
    • The Proceedings of the 12th Australian Road Research Board Conference, Hobart, Tasmania, 27-31 August 1984.
  • Corporate Authors:


    Melbourne, Victoria  Australia 
  • Authors:
    • AUFF, A A
  • Publication Date: 1984

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 146-158
  • Serial:

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Filing Info

  • Accession Number: 00393425
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jul 31 1985 12:00AM