Research On Disease Types And Treatment Technology For Asophalt Pavement Of Ji-Qing Highway

Disease treatment is a long-term daily work, it can get the twice result with half effort that completes the daily small repairs and maintenance. Strengthen the daily patrol work on pavement and take timely measures of the newly discovered various slight diseases including slight crack, mild subsidence and nets crack, local small hole etc. At the same time, according to the operation condition, road traffic flow situation and traffic conditions, to carry out comprehensive investigation of diseases and road conditions, and according to damaged condition and pavement road driving quality, targeted launch maintenance projects, such as small-scale, medium-scale and large-scale repairs.Therefore in this paper we carry out investigation study and theoretical analysis on the typical disease types and causes of Ji-Qing highway, and then put forward the corresponding countermeasures and diseases maintenance. Meanwhile combining with engineering example, discuss and analyze the frontier technologies of asphalt pavement maintenance and argument its application in the next project.The mainly contents and conclusions in this paper are:1. According to the field investigation and analysis, road surface in Qingdao section of Ji-Qing expressway has happened serious aging and degradation, brings the serious influence on highway safety and need pertinently scientific maintenance and undertake segmented, classification treatment. Especially the proportion of pavement transverse and longitudinal cracks is more about 78%, and pavement emerges subsidence, cracks, rutting and pit slot in local sections.2. Mainly aimed at disease situation of Ji-Qing expressway survey section, for different diseases adopted different processing measures respectively. Firstly, to primarily conduct small area for dig local pit slot and rutting serious disease mainly. Secondly, to conduct milling planer micro-surfacing post-processing for local mildly cracks without seam warts. Finally, to conduct large milling planer for very serious net cracks and longitudinal cracks. For semi-rigid base of Overhaul sections, to adopt the cement stable macadam base of skeleton close-grained type. The aggregate mixture is:1-2cm gravel:0.5-1cm gravel:stone crumbs=38:27:35; Best moisture content:5.2%; Maximum dry density:2.357 g/cm3. The delay time in construction should be controlled within 3 hours. Moreover construction process control of semi-rigid base has done a detailed explanation.3. This paper mainly expounds frontier technology of several diseases treatment for the asphalt pavement, including the production design and construction process during asphalt concrete pavement maintenance, and the application and technical measures of asphalt concrete. Using the flexible grassroots LSM-30, for semi-rigid base which is very easy to cause crack reflection. Separately detailed introduces mix-proportion technique index, transportation, paving and compaction method of several maintenance measurements. In addition, the construction technology of transverse toping PVC pipes was introduced in road shoulder to drain; it drained effectively the accumulation water in pavement structure layer and achieved good effect.