Influence of Base Course Moisture Content on Asphalt Pavement Performance in Cold Regions Based on Grey Relational Analysis

To explore the influence of base course moisture content (BCMC) on asphalt pavement performance in cold regions, the correlation between measured pavement performance indexes and BCMC was explored by using grey relational analysis (GRA). First of all, the test section BCMC and service performance indicators were detected and collected by embedded data detection equipment and field investigation methods. Secondly, the evolution relationship of BCMC and service performance indexes (transverse crack index, rutting index, resilient deflection index, and base compressive stress index) for asphalt pavement was analyzed. Finally, the GRA was applied to study the correlation between BCMC and service performance indexes in a cold region, and the influence of BCMC on asphalt pavement performance was revealed. It was found that different asphalt pavement types have different BCMC and service performance indexes. The correlation between transverse crack index and BCMC is higher, the relationship of stress diffusion angle, rutting index, and BCMC is second, and the correlation between deflection index and BCMC is poor. The results reveal the influence of BCMC on service performance indexes and provide a certain engineering basis for improving asphalt pavement performance in cold regions.