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The Influence Factors of the Broken Asphalt Pavement

The Influence Factors of the Broken Asphalt Pavement
1.External factors 
 
(1)With the rapid development of China's economy, the freeway trucks can grow rapidly today. Heavy overloading is one of the main causes of early damage. This issue, the efforts of the transport sector alone is not enough. 
(2)Climate factors.This is caused by rutches and the reasons for the passage of the highway. 
(3)Human factors.Traffic accidents and vehicle oil spills Traffic accidents and vehicle oil spills, jacks caused by road damage. 
 
2.Construction and conservation factors 
(1)Material selection: At present, China's provincial highway construction sector attaches great importance to the choice of asphalt, most of the selection of high-quality imported asphalt, the upper layer of modified asphalt. 
In order to ensure the quality of the asphalt, the expressway construction department of some provinces set the index value too high in the bidding process so that some asphalt suppliers will add some ingredients to the asphalt to increase the index value in order to meet the needs of the competent authorities. Seriously affecting the life of asphalt pavement. 
In addition, gravel quality of the uneven quality of the highway construction has also led to decline. In this regard, the construction sector on the supply of sand and gravel material should be unified specifications, unified tender, in the appropriate conditions of self-built materials plant, in strict accordance with standard specifications and quality of materials, not only to meet the needs of the progress of the project, but also to ensure the quality of the project . 
 
 
(2)In the actual production, in many places over the years formed a habit, that is strictly in accordance with the laboratory mix in the amount of aggregate used in the actual production. But this method of production of the mixture is often less than the design requirements, and some even greater deviation, there is a "target mix design" and "production mix design" does not match the situation, the reason is that aggregate water . 
In China, asphalt concrete pavement design method, the density is used as the density, and in the actual production process, because of natural conditions, environmental factors, so that the production mix with the laboratory mix out a lot. In the construction of expressway, the only way to solve this problem is to increase the sampling strength, through the test sections to determine the production mix to strengthen on-site supervision, the implementation of tracking operations, fixed-point, quantitative sampling, to obtain test data to guide production, Quality standards into the construction process. 

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