United States Department of Transportation
i
Evaluation of flow number (Fn) as a discriminating HMA mixture property.
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2012-06-01
[PDF-3.78 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
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Abstract:This research investigated the use of the flow number in asphalt concrete mixture design and acceptance. It included: (1)
a review of completed research concerning the flow number and the effect of mixture composition on rutting resistance, (2)
an evaluation of Wisconsin Department of Transportation (WisDOT) criteria for mixture design and acceptance based on
relationships between mixture composition and rutting resistance developed in National Cooperative Highway Research
Program (NCHRP) Projects 9-25, 9-31, and 9-33, (3) a laboratory experiment to evaluate the effect of changes in asphalt
content and filler content on rutting resistance as measured by the flow number, and (4) a laboratory experiment to develop
flow number criteria for intersection mixtures. Recommendations and criteria for using the flow number test in mixture
design and acceptance were developed.
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