沥青路面新泛油病害及其机理分析

New Bleeding and its Mechanism on Asphalt Pavement

近年来 ,随着交通量、车辆轴载的日益增大以及平均行车速度的提高 ,沥青路面的损坏出现了一些新的病害形式。本文通过路面调查发现了一种新泛油现象 ,它表现为沿轮迹带分布的路表油斑或带状泛油 ,明显不同于传统的泛油病害。试验分析在破坏处提取的芯样揭示了这种新泛油现象的产生机理 ,即高速行车引起的动水压力和荷载的综合作用使沥青面层内部的沥青发生剥落并上迁移。

In recent years, along with the increasing of traffic volume, vehicle's traveling speed and axial loads, a lot of new types of distress occurred on the heavy duty asphalt pavements. A new type of bleeding was addressed herein through a systematic field investigations and lab test analysis. Different from the traditional bleeding, the new bleeding exhibits as asphalt spots on the pavement surface or belt bleeding along wheel tracks. Test and analysis on the cores drilled at the bleeding area discovered the mechanism of the new bleeding, namely the asphalt inside the asphalt lift immigrate upward under the danymic hydraulic pressure induced by the moving vehicle and repeat loads lead to the new bleeding damage.