The Influence Of The High Temperature On The Accumulative Deformation Of Asphalt Pavement

With the rapid development of highway in our country, the rutting of asphalt pavement has become the most common damage among the highway road. The formation of the rut not only related to the load conditions, traffic channelizing, material quality, construction level and the environment temperature, but also brings very big effect on the formation of the rut. In fact,lacking of testing technology, the feature of internal accumulated deformation has not yet been fully cognitive. Therefore, it has a great significance to study the internal accumulated deformation of asphalt pavement under the condition of high temperature, which can help to understand the formation process of the rut and to prevent and control the rut.Asphalt pavement as the research object in the paper, which made the embedded FBG(Fiber Bragg Grating) sensors for monitoring the internal accumulated deformation of asphalt pavement.The research put the sensor into asphalt specimen. Firstly, through analyzing the wheel tracking apparatus simulated the action of the stress under the different temperature conditions. Secondly,using FBG sensor to monitor the internal accumulated deformation of pavement. Finally,according to the results of the monitoring test, the research on the change rule of the internal accumulated deformation under different high temperature conditions.The test results show that the accumulated deformation of asphalt upper layer and under layer are greatly influenced by temperature.While applying the same wheel load, accumulated deformation increases with the rising of temperature. And the accumulated deformation of mid-layer under different temperature had a great deformation, but did not change significantly with temperature rising. Meanwhile, as the temperature rises, the main contribution of the accumulated deformation of the layers transfer came from mid-layer to under layer gradually.Finally, the paper puts forward the CT(dynamic temperature correction coefficient) on the forecast model of internal accumulated deformation of asphalt pavement. The revised forecast model is more accurate than other methods, which has a better performer to response the changing rule of the internal accumulated deformation of asphalt pavement. The method of correcting is suitable for different materials, structure of asphalt pavement, which also provides references for the study of the asphalt pavement rutting.