Proceeding from the production practice, the article gives the cause of expressway rut and points out the function of pr asphalt modifying technology in the testing repair of highway rut section.

The preventive maintenance sections are divided by using dynamic cluster method and three indexes including rutting depth, transverse crack length and skidding resistance.

The results showe that Anti-Rut Agent PR PLASTS could be used in expressway with heavy truck traffic or in high temperature areas.