关键词: 道路工程；探地雷达；介电常数；密度预测；压实度实时监测

Abstract: The compaction quality of asphalt pavement in the construction process is an important factor affecting its performance, and insufficient compaction or excessive compaction will cause premature damage to asphalt pavement. In order to promote the development of ground penetrating radar (GPR) in the field of asphalt pavement compaction detection, and more comprehensively evaluate the compaction quality of asphalt pavement, the detection principle, system composition and data processing method of GPR were systematically expounded. The research status of GPR in the field of asphalt pavement compaction detection was summarized and concluded. The research results show that the dielectric properties of asphalt mixture are affected by the factors such as the volume ratio of its components, radar frequency and pavement temperature. The compaction degree of asphalt mixture can be predicted by establishing a composite dielectric model, but its accuracy and application range still need to be improved. For the water-bearing asphalt mixture, the presence of water may cause the measured dielectric constant to be biased, thereby affecting the accuracy of density prediction. In the future, the signal processing method of GPR can be optimized to improve the detection accuracy of GPR on the dielectric constant of asphalt mixture. The composite dielectric model with a wide range of application is further established to improve the accuracy and scope of density prediction. The GPR and the road roller are combined to establish a complete real-time monitoring system for asphalt pavement compaction.

Key words: highway engineering; ground penetrating radar; dielectric constant; density prediction; real-time compaction monitoring