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TRIS Online Accession Number:00724572
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:The National Center for Asphalt Technology (NCAT) has developed a test method to
determine the asphalt content of hot mix asphalt (HMA) mixtures by ignition. In
the ignition method, a HMA sample is subjected to 5380C (lOOO0F) in a furnace to
ignite and burn the asphalt cement from the aggregate. The difference in weight
of the sample before and after ignition is used to determine the asphalt content
of the mixture. The aggregate recovered after ignition testing may then be used
for gradation analysis.
A round robin study was completed by NCAT to determine the accuracy and
precision of the ignition method. This paper discusses the round robin test
program and the accuracy and precision values determined for the measured
asphalt content and gradation by the ignition method. Equipment developed for
the procedure was purchased by NCAT with funds provided by the Federal Highway
Administration (FHWA), National Asphalt Pavement Association (NAPA), NAPA
Research and Education Foundation, and the Alabama Department of Transportation
(ADOT). The equipment was provided along with laboratory prepared HMA samples
to 12 participating laboratories throughout the U. S. Four replicates of four
HMA mixtures containing different aggregates types, gradations and asphalt
contents were provided for testing.
The results of the round robin study show that the ignition method can
accurately measure the AC content of HMA mixtures with greater precision than
solvent extraction methods without significantly affecting the gradation of the
aggregate. This test method has shown excellent potential for replacing
existing test methods for measuring asphalt content.
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