Laboratory Evaluation of Hot-applied Sealant for Asphalt Pavement

摘要

Crack sealing and filling is one of the most successful treatments for asphalt pavement preventive maintenance. In order to evaluate the performance of hot-applied crack sealants for asphalt pavement, five test methods including cone penetration, softening point, flow, resilience and bond were proposed respectively by the reference of ASTM D5329, then, fifteen samples of hot-applied sealants which was generally used in China were tested. Based on the test results, five evaluation indices and their physical requirements were presented. The results showed the softening points of fourteen sealants are higher than 80 °C, and the flow values of thirteen sealants are lower than 5 mm, however, only four sealants passed three cycles at 50% extension in the bond tests. It indicated that the sealants used in China have good high temperature performance, but most of them have poor performance at low temperature.