Guide Construction Specifications for Pavement Preservation Treatments: Chip Seal and Microsurfacing

Pavement preservation is becoming an important activity for departments of transportation (DOTs) in maintaining and enhancing the conditions of their highways. With the enactment of Moving Ahead for Progress in the 21st Century Act (MAP-21) wherein DOTs have to show improved performance in the conditions of their highways, the use of pavement preservation treatments will be crucial to meet the performance goals. Pavement preservation treatments are treatments that do not improve the structural capacity of a pavement, but delay pavement deterioration by sealing cracks, preventing pavement oxidation, or rejuvenating the existing pavement surface layers. Preservation treatments that utilize asphalt emulsions as the binder have almost always been considered secondary to the hot mix asphalt (HMA) technologies and as such are not well understood. Furthermore, these technologies have not been upgraded or researched as much as HMA. However, over the last 5 years the Federal Highway Administration (FHWA) Pavement Preservation Expert Task Group has made a concerted effort to (1) improve the state of the science in emulsion technology and (2) create consistent performance-based standards (specifications, test methods, design practices, etc.) that are sponsored by FHWA and/or American Association of State Highway and Transportation Officials (AASHTO) and not vendor specific. The Emulsion Task Force has also drafted several standards for consideration by the AASHTO Highway Subcommittee on Materials. The rationale for creating AASHTO standards for the pavement preservation treatments was to provide credence and more importantly buy-in by the DOTs. In order to implement any of these treatments, material and construction standards have to be created. Material standards (design specs and design practices) have already been created for chip seals and microsurfacing. However, construction specifications (or a guide) for these treatments are not available and need to be developed. The objective of this project is to produce a recommended AASHTO Construction Guide Specifications for the application of chip seals and microsurfacing to assist highway agencies in tailoring their own specifications to the local conditions and environments and implement these treatments for their pavement preservation programs. The research to produce the recommended guide specifications should include a review of previous work in this area.


  • English


  • Status: Proposed
  • Contract Numbers:

    Project 14-37

  • Sponsor Organizations:

    Federal Highway Administration

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

    American Association of State Highway & Transportation Officials

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

    National Cooperative Highway Research Program

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

    Hanna, Amir

  • Start Date: 20150806
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 40208

Subject/Index Terms

Filing Info

  • Accession Number: 01572391
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 14-37
  • Files: TRB, RiP
  • Created Date: Aug 7 2015 1:01AM