Guide Specifications for the Construction of Slurry Seals, Scrub Seals, and Tack Coats

Pavement preservation provides a means for maintaining and improving the functional condition of an existing highway system. Although pavement preservation is not expected to substantially increase structural capacity, it generally leads to improved pavement performance and longer service life. Slurry seals and scrub seals are frequently used as pavement preservation treatments for flexible pavements. Slurry seals are used to mitigate oxidization and scrub seals are used to seal cracks and prevent moisture intrusion. Tack coats are applied to promote bonding of the preservation treatment to the pavement. Although a great deal of information on the design, materials, and construction practices of these treatments is available, there is no nationally accepted guidance on their construction. There was a need to develop guide construction specifications to help state departments of transportation (state DOTs) apply these treatments more effectively and achieve the most benefit of their application. The objective of this research was to develop recommended guide specifications for the construction of slurry seals, scrub seals, and tack coats as used in preservation treatments. The research reviewed and evaluated the current practices for the construction of slurry seals, scrub seals, and tack coats and proposed (1) a set of proposed guide specifications for their construction and (2) a set of practices for quality assurance of their construction. The final deliverable includes 3 parts: Part !: Final Report, Part II: Proposed Guide Specifications for Construction of Slurry Seals, Scrub Seals, and Tack Coats, and Part III: Proposed Quality Assurance Guide. Parts II and III have been provided the AASHTO Committee on Materials and Pavements for consideration and possible incorporation into the AASHTO Guide Specifications for Highway Construction; they are not available. Part I is available at https://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP14-44_Part-I_FinalReport.pdf

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4756

Language

• English

Project

• Status: Completed
• Funding: $175000
• Contract Numbers:

  Project 14-44

• 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:

  Hanna, Amir

• Performing Organizations:

  University of Arkansas, Little Rock

  33rd and University Street
  Little Rock, AR  United States  72204
• Principal Investigators:

  Braham, Andrew

• Start Date: 20200902
• Expected Completion Date: 20220301
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Pavement maintenance; Paving; Slurry seals; Specifications; State of the practice; Tack coats
• Subject Areas: Construction; Highways; Maintenance and Preservation; Pavements;

Filing Info

• Accession Number: 01707718
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 14-44
• Files: TRB, RIP
• Created Date: Jun 3 2019 3:17PM