Synthesis of Information Related to Highway Problems. Topic 45-12. Methods and Practice on Reduction and Elimination of Asphalt Mix Segregation

Segregation in asphalt paving mixtures includes both physical and thermal segregation. It is one of the contributors to reduced pavement life of asphalt pavements because it triggers pavement distresses such as raveling, stripping, rutting, and cracking. There has been much research focused on segregation measurement, factors influencing segregation, and methods to reduce or eliminate segregation. Due to the different causes and time stages of segregation, there are a large number of techniques and methods to identify and measure segregation. For example, National Cooperative Highway Research Program (NCHRP) Report 441 and other recent research discusses lab and field test results in measurement of gradation segregation and temperature induced segregation using visual identification, sand patch testing, nuclear density gauges, thermal bar, etc. The scope of this synthesis study will cover practices on reduction and elimination of asphalt segregation. Results will benefit government agencies, research, and the asphalt industry in providing guidance on successful practices for identifying and eliminating segregation during aggregate production, stock piling, as well as plant, transportation, and paving operations. It is hoped that these practices can be incorporated into highway specifications for measuring and accepting quality asphalt pavements. The synthesis will survey state and local departments of transportation (DOTs), Canadian ministries of transportation and other public agencies. International agencies' experience will be reviewed as available. From the results of the survey, 3 to 5 agencies from varying climatic regions will be selected and case examples of their practices will be developed. Lessons learned and gaps in information will also be covered.


  • English


  • Status: Active
  • Funding: $40000.00
  • Contract Numbers:

    Project 20-05, Topic

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program (NCHRP) Synthesis

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001
  • Project Managers:

    Vlasak, Donna

  • Performing Organizations:

    Gardiner Technical Service LLC

  • Principal Investigators:

    Stroup-Gardiner, Mary

  • Start Date: 20131122
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 37745

Subject/Index Terms

Filing Info

  • Accession Number: 01543928
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic
  • Files: TRB, RiP
  • Created Date: Nov 23 2014 1:01AM