Technological Study On Asphalt Cold-Regeneration For Technological Reconstruction Of Jiujiang To Jingdezhen Expressway

The asphalt pavement built in 1990 s in Jiangxi Province has come into the stage of the major & medium repair in succession, subsequently a large amount of waste asphalt mixture is occurred during the cold planing of the damaged pavement. The asphalt cold-regeneration technology can reuse the waste asphalt mixture from the damaged pavement in order to enhance the utilization rate of the resource and protect the environment, and it also adheres to the national strategic policy of recycling and sustainable economic development. Therefore, the study on the asphalt cold-regeneration technology is of significance.The study is based on the technological reconstruction of Jiujiang to Jingdezhen Expessway(the Expressway) in Jiangxi Province. Firstly, the existing problems have been pointed out according to the design status of the existing pavement, the pavement structural strengthen and its performance have been analyzed as a whole, and from the result of the analysis, the representative pavement deflection value is generally large, and the most sections of the Expressway has inadequate bearing capacity, the Expressway is comparatively poor in quality as a whole, it is urgent to strengthen the pavement of the Expressway in order to increase the bearing capacity of the pavement. Three remedial schemes for the strengthening of the corresponding damaged pavement have been figured out based on the deflection value, the analysis of the traffic load and the calculation of the structural mechanics.Secondly, the category of the asphalt cold-regeneration and its application are stated in the Study, it is determined that the plant-mixed asphalt cold-regeneration technology is adopted to reconstruct the pavement of the Expressway. The principle of asphalt pavement cold-regeneration is analyzed chemically, the strength formation mechanism for the mixture of the asphalt cold-regeneration and the mixture of asphalt cold-regeneration with cement are analyzed respectively, meanwhile, the impact factors on the strength of the mixture of emulsified asphalt cold-regeneration is also analyzed; the mixing ratio for the mixture of the cold-regeneration with the different consumption of the cement is experimented to determine the content of the emulsified asphalt and the cement in the mixture,and the mixing ratio of the emulsified asphalt cold-regeneration mixture is figured out for the reconstruction of the Expressway, and the indoor experimental standard of the emulsified asphalt cold-regeneration is prepared. The performance of the plant-mixed asphalt cold-regeneration mixture with different content of the cement and the emulsified asphalt is studied through the indoor experiment, such as the stability property of the mixture in the circumstance of water, high temperature, resistance to the crack in the low temperature, resistance to the fatigue and the strength and etc. The experimental results show that the property of the plant-mixed cold-regeneration mixture comforts to the requirements of the Technical Specifications.Finally, the thesis summarizes the construction workmanship of the plant-mixed emulsified asphalt mixture, points out the controlling requirements during the courses of the construction, concludes the content of the construction quality control and acceptance standard. And the temperature of the asphalt cold-regeneration mixture suitable for the road section is summarized through the observation on the temperature in the different layers of the testing road section in order to provide the reference for the further application of the plant-mixed asphalt cold-regeneration mixture.