| ChangPing expressway in the three northeast provinces of jilin province, the central province highway, 1, dalian, shenyang and Harbin guannei, north road, is the main system layout of the "two longitudinal two horizontal" with the important to sanya river highway, jilin province road network planning for 30 years of three "highway" has been an important part of the skeleton. ChangPing expressway is 133 kilometers, 1992, construction, 1996, has opened for 13 years of transportation service. In recent years, with the traffic load ChongXingHua, traffic flow channel, traffic density increases trends, such ChangPing many highway performance has been gradually began to decay, such as road, carrying capacity of breakage, worsen sharply, make ChangPing highway has not provided for vehicles, safe, comfortable, a fast, but also the operation environment of vehicles increases the operating expenses, and increase the risk of traffic, reduce the path of service ability and transportation efficiency. Therefore, timely to ChangPing highway maintenance and repair, make its use to recover and improve the performance, extend the use fixed number of year, this way not only for highway management department provides the huge economic efficiency, more important is for the convenience of travel, highway users to promote social material circulation is ensured.Combined with the actual ChangPing highway maintenance engineering, this paper firstly ChangPing highway typical types of diseases and disease causes are analyzed, and the type of disease ChangPing expressway complicated, causes are also different. For example, cracks appear primarily by the changes in temperature, But the overload vehicles, overrun, aggregate, construction of pavement compaction degree is not the rut. Also, this paper expounds the existing asphalt pavement repairing technology for mild disease, daily maintenance and small through improved maintenance, maintenance, and can improve minor through the way of service level, reduce the operating cost, prolong service life, maintain the safety of expressway and smooth, improve the comprehensive highway operation benefit and social benefit. With the increase of time, highway of defects and problems and erosion of diseases, but also exposed gradually out of these lesions are daily maintenance and repair is small, can be solved through special maintenance or overhaul perfected.In the deep analysis of the asphalt mixture composition and distribution, based on the theory of ChangPing expressway asphalt pavement.this damaged the major forms of water damage and high-temperature rutting, early damage, according to the principle of skeleton - close-grained type special maintenance engineering ChangPing expressway asphalt mixture ratio design of the target, the top layer using AC - 16K and AC - 16I median two gradation, and below the floor adopts the CY - 20 and AC - 25I median two gradation asphalt by north, AH - 90 and XiTai modified asphalt two kinds. Through the experiment results, though various types of asphalt mixture in the dynamic stability, freeze-thaw splitting residual strength and low temperature performance indicators can meet the requirement of the specifications, but in the surface layer of asphalt mixture, the XiTai modified asphalt AC - 16K type of asphalt mixture water stable performance is good, but XiTai using modified asphalt AC - 16I type of asphalt mixture water stable performance is good, In the asphalt mixture, the XiTai modified asphalt CY - 20 type high temperature stability of asphalt mixture, and good performance of modified asphalt by XiTai AC - 25I type of asphalt mixture water stable performance is good, Using XiTai modified asphalt AC - 16K type of asphalt mixture temperature anti-cracking performance is better. According to the analysis, from the high temperature stability, water damage and low-temperature cracking-resistance, see, ChangPing highway maintenance engineering asphalt mixture ratio by using as follows: 5% SBS modified asphalt surface of AC - 16K type of asphalt mixture, And the modified asphalt by 3% SBS asphalt mixture CY - 20.Finally, the technology is introduced in ChangPing micro-surfacing construction of expressway curing and entity. Practice shows that the micro-surfacing construction technology and other than the pavement maintenance, construction speed is quick, greatly shorten the time of traffic opening, low cost, energy saving etc. Advantages, after construction waterproof and surface sliding resistance performance greatly improved, especially in the rut to fill, thoroughly changed the rutting memory water to skip the situation as safe hidden trouble, the effect is very good. The micro-surfacing pavement maintenance measures suited to a lesser degree, also did not appear serious damage of asphalt pavement.this micro-surfacing preventive maintenance, posterior surface sliding resistance, flatness, etc have different degrees of improvement, and to reduce the surface cracks, waterproof coefficient, crack, such as well. Due to the micro table place from the of all kinds of materials measurement technique and the mixture mixing, paving process is completed in construction field, thus the construction operation except to grasp the modification emulsified asphalt selection and dose control, the selection and aggregate gradation, control key dosage of packing, but also focus on construction quality control links, through the construction, constantly sum up experience, and improving the micro-surfacing technology level. The micro-surfacing technique to improve the function of the road, reduce table damage rate, meet the highway asphalt pavement preventive maintenance requirements, has the remarkable economic and social benefits and broad application prospect. |
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