Large-stone hot mix asphalt (HMA) pavements have been promoted by various associations including the National Asphalt Pavement Association (NAPA) as an answer to rutting problems which exist with current pavement design. Until 1988 the Colorado Department of Transportation (CDOT) had little or no experience with the advantages or disadvantages of large-stone HMA pavements. This report investigates problems encountered in the construction of three large-stone HMA construction projects. Problems encountered with large-stone HMA include segregation of the mix and the validity of mix designs produced with standard test equipment. The study examined the following: the lab tests in use by the CDOT for large-stone pavements, constructability, field performance, and cost required to produce the mix. The study found that grading G should be allowed on projects when practical; grading G should be used as a base course; segregation and smoothness should be addressed before paving; if used as a wearing surface, large-stone HMA should be for experimental projects where pavement smoothness and segregation of the mix are addressed extensively before paving; and grading G should be placed in a minimum lift of 75 mm (3 in.).

  • Corporate Authors:

    Colorado Department of Transportation

    4201 E Arkansas Avenue
    Denver, CO  United States  80222

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Price, D A
    • Aschenbrener, T
  • Publication Date: 1994-4


  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 50 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00664351
  • Record Type: Publication
  • Report/Paper Numbers: CDOT-DTD-R-94-5
  • Created Date: Aug 19 1994 12:00AM