Synthesis of Information Related to Highway Practices. Topic 48-10. Survey of State Practices on Aggregate Quality Requirements for Pavements

Constructing and maintaining highway systems requires a dependable and abundant supply of relatively high quality aggregates, borrow and select material, quarried rock, sand and gravel, and other materials such as reclaimed asphalt pavement (RAP) or recycled concrete aggregate (RCA). Finding and qualifying such sources is important in terms of material availability and costs related to production, performance testing, and hauling distance to paving projects, as suitable materials may be limited by specifications and/or land development/permitting issues affecting the development of new sources or recycling facilities. Moreover, the availability of high quality aggregate material is decreasing in many parts of the country as sand and gravel mines and rock quarries are depleted or lost to other land uses. Opportunities exist to provide adequately performing roads and achieve better value by blending materials from various sources of different quality or grading. Generally, aggregate type and quality are important factors for determining its use and placement within the different layers of the pavement structure depending on the design traffic level, subgrade soil, and the environment. Nonetheless, what some states consider a "good or high quality” aggregate suitable as base course material, for example, other states may not consider suitable for similar pavement applications. Under certain conditions, various states have used marginal quality aggregate which performed adequately under similar loading conditions where slight modifications in the design and construction procedures have been carried out. This approach of optimizing the use of local materials with design and construction methods has the possibility of significantly reducing the overall construction cost and energy expenditure. The objective of this synthesis is to document and summarize state department of transportation (DOT) requirements for aggregate quality for pavements, both natural (quarried) and recycled. The study will cover the use of locally available aggregate sources, current production experiences and selection practices, typical value ranges for aggregate tests related to their performance (e.g., LA abrasion, strength), as well as design procedures aimed at comparing performance results in various types of construction and sustainable field applications. Differences across states requirements for aggregate quality related to various road applications will be captured. The report will be useful to DOTs in their effort to identify, appraise and use available aggregate sources in the most economical ways for the sustainability of intended roadway applications.


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  • Status: Proposed
  • Funding: $45000
  • Contract Numbers:

    Project 20-05, Topic 48-10

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Gause, Jo

  • Start Date: 20160509
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 40819

Subject/Index Terms

Filing Info

  • Accession Number: 01598987
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic 48-10
  • Files: TRB, RiP
  • Created Date: May 11 2016 1:00AM