United States Department of Transportation
i
Balanced Asphalt Concrete Mix Performance in Utah, Phase VI: Multi-Laboratory Testing of Ideal-CT
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2022-07-01
[PDF-1.79 MB]
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Edition:March 2021 to July 2022
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Abstract:This report describes the research efforts aimed at determining the repeatability of the IDEAL-CT test for asphalt concrete mixtures. It follows a series of studies investigating different cracking tests. 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 series of studies.
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