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INTRODUCTION
The two major components of hot-mix asphalt (HMA) are the
asphalt binder and the aggregate. Thus, accurate measurements of
the percent asphalt content (%AC) and aggregate gradation are
required for HMA quality control and assurance. The Troxler NTO
Asphalt Content Ignition Oven allows safe, quick, and reliable
measurement of the %AC of HMA samples and creates samples for
aggregate gradation measurements.
The oven employs a method developed by the National Center for
Asphalt Technology (NCAT) called pyrolysis, or ignition. In this
method, an HMA sample of known mass is prepared. The asphalt
binder in the sample is then burned. The change in sample mass
indicates the %AC. Standard sieve analysis of the remaining clean
aggregate provides the gradation.
The ignition oven test method is covered by the provisions of the
American Society of Testing and Materials (ASTM) Standard
D 6307, Standard Test Method for Asphalt Content of Hot-Mix
Asphalt by Ignition Method.
The oven can also be used in conjunction with a nuclear asphalt
content gauge, such as Troxler Models 3241–C, 3241 USS, and
3242. The nuclear gauge provides a fast method of measuring the
%AC when the aggregate gradation is not needed. The oven can be
used when a job requires aggregate gradation.
The nuclear gauge test method is covered by the provisions of the
ASTM Standard D 4125, Standard Test Method for Asphalt Content
of Bituminous Mixtures by the Nuclear Method. For more
information on Troxler's asphalt content gauges, contact your
Troxler representative.
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