Asphalt materials used in treatment of pavement distresses at the BRT bus station

ABSTRACT Due to the limited influence on traffic, orthotropic steel deck has been more and more widely used. However, the durability of steel deck asphalt pavement is a critical technical issue in the construction of bridges. At the Bus Rapid Transit (BRT) bus station, rutting, swelling and several other distresses were observed shortly after opening to traffic. In order to deal with these distresses, both an emergency repairing method and a long-term rehabilitation approach are proposed and analysed in this technical note. For the emergency measure, a newly-developed polymer material, which has both high-temperature stability and low-temperature flexibility, was applied and no distresses occurred for a long time when the modified self-compacting elastic concrete was used. For the long-term approach, an advanced modified asphalt binder and an improved cost-effective stone matrix asphalt (SMA) mixture with both high-temperature stability and low-temperature flexibility are developed by conducting a series of orthogonal tests in the lab. The findings of this technical note can be used as a reference to deal with similar distresses.