Testing of Field Cores to Determine Performance of Asphalt Mixtures

A study was conducted in which cores were taken from pavements three years after construction. The flexibility index (FI) of the cores, a parameter that relates to intermediate temperature cracking, was measured in the lab and compared to the known values of the same material obtained during constructions. The results indicate that after three years of field aging, the FI of the mixtures can decrease by as much as 50% or more. The change was affected by the temperature where the pavement was located. A comparison was done between two tests that are designed to predict asphalt mixture performance at intermediate temperatures. It was found that both tests can predict the mixtures with the worst performance, but there was little agreement in other mixtures. Furthermore, high variability was observed on both tests evaluated. It was concluded that the effects of aging should be considered during the mix design process when selecting a possible threshold value to prevent intermediate temperature cracking.

• Record URL:
  • https://www.ugpti.org/resources/reports/details.php?id=1092
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/64103
• Summary URL:
  • https://rosap.ntl.bts.gov/view/dot/67535
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  University of Utah, Salt Lake City

  Department of Civil and Environmental Engineering
  Salt Lake City, UT  United States 

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Romero, Pedro
• Publication Date: 2022-7

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Maps; Photos; References; Tables;
• Pagination: 19p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Core samples; Cracking; Field tests; Flexibility; Pavement performance
• Subject Areas: Highways; Maintenance and Preservation; Pavements;

Filing Info

• Accession Number: 01857403
• Record Type: Publication
• Report/Paper Numbers: MPC-22-467
• Contract Numbers: MPC-640
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Sep 12 2022 10:18AM