Microwave apparatus and method for analysis of asphalt-aggregate compositions

An apparatus for analyzing the asphalt content of asphalt-aggregate compositions, said apparatus comprising:

• a source of microwave radiation;
• a cavity in communication with said microwave source;
• a sample holder in said cavity for holding a sample of an asphalt-aggregate composition during exposure to microwaves from said source;
• a susceptor within said cavity furnace for converting microwave radiation into heat;
• thermal insulation between said sample holder and the remainder of said cavity for defining a furnace within said cavity;
• means for minimizing or eliminating any undesired combustion products generated by the burning asphalt;
• a temperature sensor for determining the temperature within said thermal insulation;
• means for controlling the microwave power applied to the sample based on the temperature detected by said temperature sensor;
• and
• means for moderating the airflow through said cavity in response to the measured temperature.