In order to accurately evaluate the inner pavement condition of the highway asphalt pavement, the ground penetrating radar and high-speed laser deflectometer were used for joint detection. The structural inner condition evaluation method, evaluation index and evaluation criteria were proposed from the aspects of structural integrity and structural strength. The corresponding case studies were performed. In terms of structural integrity, the ground penetrating radar shows that there are three kinds of hidden diseases such as insufficient compaction, poor interlayer contact, and looseness, which can be evaluated by the inner pavement condition index (IPCI). In terms of structural strength, the high-speed laser deflection test results can be linearly converted into Beckman beam values, and the pavement structure strength index(PSSI) can be used for evaluation. Based on IPCI and PSSI, the internal state of the road can be divided into four categories: I, II, III, and IV. Research results can provide decision support for pavement maintenance.

CICTP