Effect of Anti-Stripping Agent with Bipolarity to Strip-Ravelling Damage Caused by Surface Shear Stress

The stripping is one of serious distresses because it causes the decline in the bearing capacity of the asphalt pavement. As the result of evaluation of the bearing capacity of the pavement by FWD, the dissipation amount of work becomes larger at the stripping area in comparison with non-stripping area. An anti-stripping agent is effective for preventing such stripping in advance. The new anti-stripping agent which used in this research forms the strong electrochemical bonding between the asphalt and the aggregate by giving bipolarity to the asphalt. Furthermore, it is clarified that the new anti-stripping agent can give improve and enhance the shear strength of the asphalt as well. The shear strength is closely related to the rutting and the fretting of the asphalt pavement in accordance with past research. Therefore, enhancing the shear strength should contribute to not only the improvement in the rutting and the fretting but also the prevention of the strip-ravelling that the fine aggregates and the asphalt mortar are washed out from the pavement surface and it often takes place in Malaysia and Asian countries. In this research, we will focus on the strip-ravelling of the asphalt pavement, and simulate the strip-ravelling by using an immersed-wearing tester. As a result, this research clarifies the relationship between the shear strength of the asphalt and the strip-ravelling of the asphalt mixture.