Network-level Evaluation Method of the Overall-Intralayer-Interlayer Interface Structural States of Semi-rigid Asphalt Pavement

The pavement structure strength index (PSSI) indicator in the Chinese standard and the structural number (SN) indicator proposed by AASHTO are widely used to evaluate the structural states of semi-rigid asphalt pavement. However, PSSI and SN indicators do not involve the intra- and interlayer interface structural state, and the indicators are disconnected from the pavement design indicators. In this study, the intralayer remaining life and structural attenuation state were considered comprehensively to propose the indicators of the surface/base/subgrade structural state index (SSSI/BSSI/GSSI). The interlayer interface structural state index (ISSI) was proposed based on the friction coefficient between the surface and base layers. The pavement structural state index (PaSSI) was proposed by assigning the weightings to SSSI, BSSI, GSSI, and ISSI indicators. Compared with the PSSI or SN indicators, the proposed indicators realize the intralayer–interlayer–overall structural evaluation of the pavement, and the indicators were based on the pavement design indicators.