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1、Asphalt roadbed disease types and the analysis of the causes In order to effectively deal with diseases of the asphalt pavement, asphalt pavement of the preventive conservation techniques. According to different classification methods, the road surface disease can be divided into different types of
2、diseases caused by the road for many reasons. For road type of disease that may arise in the disease before the appearance of the right time, using reasonable preventive conservation measures are delaying the deterioration rate of pavement performance, extend the life cycle cost savings and an effec
3、tive way. The rapid development of highway construction in China has become the worlds second largest State owned highways. With the rapid development of highway construction, road maintenance technology is widespread public concern, the Preventive Maintenance of Asphalt Pavement become a new topic.
4、 Preventive Maintenance refers to the road or the road before the disease occurred in the early disease in a targeted manner to address the conservation of the road in advance to prevent the further expansion of the disease in order to reduce the deterioration of pavement performance rate, the exten
5、sion of pavement service life. Pavement is divided into 2 categories. One is functional damage to asphalt pavement surface that small micro-cracks, Ma face, peeling,泛油, asphalt aging, diseases of the road a little water and so on, resulting in formation of non-road performance and a decline in anti-
6、slide. So that it no longer has the desired function. The other is structural damage, that is, the surface of asphalt pavement serious cracks, pits, settlement, it is the overall pavement structure or a component of one or more of the damage can be achieved can not be serious when the load bearing v
7、ehicles . This type of damage is not necessarily the same time 2, is generally functional damage occurs first, followed by structural damage. Structural damage to the general need for a thorough renovation, but for functional damage, can be repaired, to restore the conservation of the entire road su
8、rface and anti-slide, that is through preventive conservation measures, to improve and enhance the use of good asphalt pavement performance and extending its life to meet the traffic requirements. By the disease occurred at a time can be divided into three stages. The first phase (early deformation,
9、 damage phase) for the road was opened to traffic after the l 3, the stage of the deformation of asphalt concrete pavement, disease mainly for road vertical and horizontal cracks, surface subsidence caused by subgrade settlement, as well as emerging local potholes. The first stage of deformation sub
10、grade stabilized with asphalt concrete pavement of early deformation, disease management, as well as asphalt condensate through the soil surface in the vehicle under repeated loads and constantly re-compacted to achieve the basic stability. Stage of the deformation of the road, the main table for th
11、e disease as a vehicle tire of the constant wear and tear on the road, the track increased, and will appear during the rainy season a small number of holes. The third phase of 8-10 years for road use, the stage of the deformation of asphalt concrete pavement, disease is mainly expressed in the road
12、network cracking until extensive damage, the road gradually lost the use of functions. Deformation of Asphalt Pavement, disease will not only affect the road traffic quality and traffic safety, as well as the life of the road, but also bring about certain social implications. Asphalt pavement caused
13、 by the deformation, diseases are many reasons, there are reasons for the design and construction reasons, the material conditions of the quality of the causes and the reasons for the outside world. Therefore, effective conservation, particularly in preventive conservation to maintain good function
14、of the road, and the extension of the service road. 2 Preventive Maintenance Technology Preventive Maintenance is usually used for no damage or only slight signs of defects and diseases of the road. Currently used techniques of preventive conservation, including surface layer, and sealing cracks, su
15、ch as thin-layer Overlay.2.1 surface layerContinuous manner with the laying of a layer of the entire road surface, the conservation level, closure layer material can be a separate layer of asphalt or other sealing agent may also be composed of asphalt and the aggregate mixture. The purpose of the su
16、rface sealing layer is water-sealing closure, anti-slide, to improve the smoothness, the restoration of surface features. Currently used technology of surface fog layer closure layer, reducing sealing layer, stone sealing layer, such as slurry seal. Application of slurry seal is a wide range of pre-conservation technologies. Slurry seal technology for the new and old pavement aging, cracking, smooth, loose, pit, such as disease prevention and maintenance can play a role
