Capacitance method for measuring the asphalt content of bituminous mixtures

Based on the dielectric physics and actual field procedure, the paper proposes one specific indirect test, a new capacitive method for determining the asphalt content of bituminous mixtures. In the dielectric physics, when the matters of different permittivity are mixed according to different mass ratio, the mixture effective permittivity will change with the mass ratio. By means of the feature and variable permittivity sensor principle, the paper discusses the capacitive method principle, sensor design, and data processing and calibration key technique problem. The experimental results prove the capacitive method is feasible and of great practical value for improving bituminous pavement quality.