Xinjiang Highway Asphalt Pavement Diseases And Long-term Maintenance Measure Research

Asphalt concrete pavement has good mechanical properties, good road property, good durability, so it has been widely used in highway pavement. But with the development of economic level, the continuous improvement of the design of the logistics, the asphalt pavement of the expressway appeared different degree of damage, detection, repair of the asphalt concrete pavement has been put on the agenda, how to carry out real-time detection, the maintenance of asphalt concrete pavement by means of modern effective maintenance, has become the common problems encountered in highway management department.This paper takes Xinjiang expressway as the project background, the cause of the disease of asphalt concrete pavement of expressway are analyzed, evaluated the conservation measures and effect, long-term maintenance suggestions put forward on the basis of the expressway. Firstly, typical disease of the expressway are analyzed, the analysis found the causes of transverse cracks is mainly temperature cracks or reflection crack, longitudinal crack for subgrade uneven settlement and the bearing capacity of pavement caused by insufficient. crack,subsidence more grassroots, local subsidence caused by insufficient strength of pavement, and rutting include compaction rut, instability rutting, wear type track three forms. Pavement strength deficiency is mainly due to the roadbed compaction degree is insufficient, the water content is too large, the surface layer thinner, grass-roots broken into a whole other causes. Maintenance measures and then the prophase has taken such as micro table place, SMA cover, wear thin layer cover, hot mix asphalt modification AC the implementation of covering the implementation effect were evaluated and analyzed. Then the traffic volume on the three segment of the expressway are analyzed, the analysis in the whole sections of various models, 3 cars and 5 the growth rate of the smallest, the largest increase in the car. On the highway pavement condition, such as the status of the existing pavement damage strength of pavement structure, pavement riding quality, pavement anti slide performance, rutting is evaluated, and then according to the evaluation result, the highways need maintenance sections separated corrective maintenance section and pre maintenance section. Finally put forward the suggestion of the highway maintenance, the need for local sections of corrective maintenance for processing, to ensure the overall pavement performance, to improve the safety of the pavement durability, stability and driving, and gives the different correction processing scheme of maintenance sections with body and suggestions. The remaining sections of the local disease treatment and preventive maintenance are combined, the combination of short-term and long-term. According to the statistics of the pavement disease and decay, the expressway procuring is divided into three stages to complete, and lists the various pre maintenance section processing scheme and suggestion.Summarized through analysis of typical disease of the expressway, and put forward the concrete has for long-term maintenance project, but also provide certain reference for other highway maintenance and repair.