1.This method is applicable to the asphalt pavement construction of asphalt dosage testing use to assess the construction quality, but also applicable to the old road survey to detect the asphalt dosage of asphalt pavement. But for coal asphalt pavement, need to have coal asphalt free carbon content of the original measurement data.

2.instrumentation and materials: reflux type asphalt extraction instrument by the water condenser, extraction cylinder, copper mesh sieve bucket, outer sleeve and heat source and other parts of the components