Variability of the IDEAL-CT Test for Pavement Cracking to Achieve a Balanced Asphalt Mix Design

This report describes the research efforts aimed at determining the repeatability of the Indirect Tensile Asphalt Cracking Test (IDEAL-CT) for use as part of the balanced asphalt mix design process. Three mixes in common production in the Northern part of Utah were investigated by three different labs experienced in performance testing. Within lab and between lab variability were studied as well as a number of factors likely to cause variability. Recommendations were developed for specimen preparation, minimum number of replicates, and how to discard outliers. It was found that the test could be repeated within laboratory within a coefficient of variation, CV, of 15% and between laboratories within a CV value of 20% using properly trimmed results. Four replicates are recommended with the result farthest from the mean discarded. No correlation between higher CT index and greater durability was identified in this study.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=1117
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/66633
• 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
  110 South Central Campus Drive, Room 2115
  Salt Lake City, UT  United States  84112

  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

  Utah Department of Transportation

  Salt Lake City, UT  United States 
• Authors:
  • Romero-Zambrana, Pedro
• Publication Date: 2023-2

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 35p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Laboratory tests; Pavement cracking; Tension tests; Test procedures
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 01875825
• Record Type: Publication
• Report/Paper Numbers: MPC 23-492
• Files: UTC, NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Mar 20 2023 9:35AM