Three Wheel Polishing Device and Dynamic Friction Tester Accelerated Laboratory Friction Testing Repeatability and Reproducibility Study

Florida, Maryland, and Tennessee State highway agencies along with the National Center for Asphalt Technology (NCAT) are in a task group to develop an American Association of State Highway and Transportation Officials (AASHTO) standard for preparing and conditioning laboratory samples for dynamic friction tester (DFT) testing. The DFT is a proven friction measurement device that tests a circular path of approximately 37 inches. Maryland State Highway Administration (MDOT SHA) uses the DFT in their standard specifications for qualifying aggregate for friction purposes. The proposed AASHTO standard will assist in implementing accelerated laboratory friction testing. This supports Strategic Objective #1 of the FHWA 2018 Strategic Plan which states “Save lives by expanding the use of data-driven, systemic safety management approaches and by increasing the adoption of proven safety solutions by all road owners.” The laboratory slab conditioning (surface polishing) is performed by the Three Wheel Polishing Device (TWPD) developed by NCAT. The amount of conditioning is measured by number of cycles of the three-wheel carriage along the same path that the DFT uses to measure friction. Accelerated friction testing is intended to identify “long-term” terminal friction properties and is not tied to traffic passes. This study compared 100,000 and 150,000 cycles as sufficient polishing to achieve terminal friction of the surface. There is very limited data on multi-laboratory repeatability/reproducibility of a TWPD/DFT testing protocol. Both MDOT SHA and NCAT have test protocols, but they are different. The proposed protocol follows the MDOT SHA procedure with some modifications. This study examined the multi-laboratory repeatability/reproducibility of a TWPD/DFT testing protocol. The scope of the study included the evaluation of the laboratories’ slab compaction, polishing with the TWPD, and friction measurement with the DFT.

• Record URL:
  http://eng.auburn.edu/research/centers/ncat/files/technical-reports/rep19-05.pdf
• 
• Corporate Authors:

  National Center for Asphalt Technology

  Auburn University
  277 Technology Parkway
  Auburn, AL  United States  36830

  Maryland Department of Transportation

  Baltimore, MD  United States 

  Federal Highway Administration

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

  National Asphalt Pavement Association

  ,    
• Authors:
  • Heitzman, Michael
  • Gu, Fan
  • Welderufael, Amanuel
• Publication Date: 2019-8

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; Tables;
• Pagination: 30p

Subject/Index Terms

• TRT Terms: Compaction; Friction tests; Laboratory tests; Polished aggregates; Samples; Slabs; Standards; Test procedures; Testing equipment
• Identifier Terms: American Association of State Highway and Transportation Officials; Maryland State Highway Administration
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 01719117
• Record Type: Publication
• Report/Paper Numbers: 19-05
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Oct 7 2019 9:17AM