Evaluation of Enhanced-Friction Asphalt Overlays and Surface Treatments

This project will evaluate alternative asphalt-based solutions, both thicker asphalt mixtures and thinner asphalt-based surface treatments, that may provide similar frictional benefits to HFSTs, but with reduced cost and/or increased durability. Specifically, this project will explore potential high friction aggregate options that could be used in Florida and can be incorporated into asphalt mixtures and/or surface treatments. The project will explore and optimize the type(s) and amount of high friction aggregate(s) needed in existing Florida Department of Transportation (FDOT) friction courses (FC-4.75, FC-9.5, and FC-5) containing other aggregates commonly used in Florida for surface mixtures (south Florida limestone and Georgia granite) to significantly improve the frictional characteristics of these mixtures. Note 1: FC-4.75 has been used on occasion by FDOT. It is governed by a developmental specification located on the Department’s website. FC-4.75 can be placed thinner than traditional dense graded friction courses commonly used by the Department and may provide a more cost-effective option than FC-9.5. The project will also determine the most cost-effective measure for improving friction characteristics to multiple prescribed levels.

Language

• English

Project

• Status: Completed
• Funding: $240000
• Contract Numbers:

  BED59

• Sponsor Organizations:

  Florida Department of Transportation

  Research Center
  605 Suwannee Street MS-30
  Tallahassee, FL  United States  32399-0450
• Project Managers:

  Chami, Ahmad

• Performing Organizations:

  Auburn University

  Department of Civil Engineering
  238 Harbert Engineering Center
  Auburn, AL  United States  36849
• Principal Investigators:

  Moore, Nathan

• Start Date: 20220422
• Expected Completion Date: 20240630
• Actual Completion Date: 20240718

Subject/Index Terms

• TRT Terms: Aggregates; Friction; Overlays (Pavements); Surface treating
• Geographic Terms: Florida
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01895144
• Record Type: Research project
• Source Agency: Florida Department of Transportation
• Contract Numbers: BED59
• Files: RIP, STATEDOT
• Created Date: Oct 3 2023 8:50AM