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INTRODUCTION
The two major components of 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 ICO 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
ASTM D6307 (Standard Test Method for Asphalt Content of
Asphalt Mixture by Ignition Method) and AASHTO T 308
(Determining the Asphalt Binder Content of Hot Mix Asphalt
(HMA) by the Ignition Method).
The oven can also be used in conjunction with a nuclear asphalt
content gauge, such as Troxler Models 3241–D, 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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