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1、1附录Asphalt Concrete Pavement Construction Quality ControlLi Gang, low IncomeAbstractThis paper is the combination of highway pavement maintenance based on the work, by analyzing the formation mechanism of asphalt concrete pavement, asphalt pavement during the construction period on how the construct
2、ion quality control issues to present their views and experiences, to prevent the development of Pavement Distress on the current asphalt concrete pavement by the phenomenon of high incidence of disease has a certain reference.Keywords: Highway; asphalt concrete pavement; Construction Quality Contro
3、l1 A road surface disease and major hazards1.1 surface pitsHighway pavement surface pits is the earliest of the disease, especially in the rainy season. Likely to cause road bumps, the high speed of the car and the large tonnage of the vehicles, the larger the depth of deep trenches and even endange
4、r traffic safety. In addition there are destructive pit road development, the so-called do not fill a hole, big hole to suffer.1.2 Pavement Rutting and own packagePavement rutting season usually occurs in high temperature, especially after the hot season will still be within one month of development
5、.Owned by packages in two situations: First, and pavement rutting the same time and place; Second, in the individual sections of a small area (area 6m2) occurred.Pavement rut and own package is mainly caused by car bumps; rain will cause water 2in the street, reducing pavement skid resistance, there
6、by endangering traffic safety.1.3 Pavement CracksPavement cracks occurred mainly in winter, with transverse cracking. Performance in the rain season, the most obvious, or even jack pulp phenomenon. Crack key hazards are as follows: First, the formation of surface pits is easy; Second, surface water
7、would seep into the surface layer of the internal and road base, pavement damage.1.4 pavement cracks and loosePavement cracks and loose most evident in the winter. In the rainy season, especially in cold weather, rain season, the road tends to form cracks and loose a large area (area 1m2) of trenche
8、s and pump slurry, together with infiltration of surface water within the surface layer and the road base, threatening the entire pavement structure . 1.5 Pavement BleedingBleeding caused by road pavement skid resistance is mainly down, for a motor vehicle traveling on the highway, down the road ski
9、d resistance led directly to the brake and steering performance degradation, endangering traffic safety.2 Formation Mechanism of Pavement Distress2.1 surface pitsThe formation of surface pits is because of water damage. In a lot of fast traffic load, tire position and the hydrodynamic pressure gener
10、ated by vacuum suction from the surface will result in gravel asphalt concrete flaking out, or cause weathered stone, gravel and so crushing strength difference. Through the cycles, the formation of pits.A lot of impurities in the aggregate, gravel aggregate pro-poor quality and poor 3sections of th
11、is oil is most obvious. Also, if road loose, cracked, old and new pavement cracks and joints, poor road handling, pit has also greatly increased the likelihood.2.2 Pavement Rutting and own packagePavement rutting and the formation of complicated ownership package, mainly the following aspects: First
12、, the destructive effects of overloaded vehicles; second, high temperature stability of asphalt concrete road surface worse.The former is caused by a key factor in pavement rutting. In accordance with the Ministry of Transportation design and technical specifications related to testing standards, th
13、e pavement load for the rear axle load 100kN, tire pressure is 0.75MPa. But this year, nationwide auto gauge control work, before driving on the highway most of the large trucks for more than 30% overrun, and some even as high as 180KN, tire pressure up to 1.1MPa.High temperature stability of asphal
14、t concrete road surface is poor, particularly in like 2003 and this continued under the influence of high temperature, surface temperature is often above 70 , then the internal, such as road surface temperatures in the surface layer of a higher and longer duration . The main role of the middle layer
15、 is a permanent deformation and rutting resistance, according to Chinese and U.S. scientists study shows that: Rut is the main part of the road surface 5cm-10cm.For semi-rigid pavement, if the primary does not damaged, then the rutting in asphalt concrete pavement is to generate the. The road surfac
16、e temperature stability are the main reasons are the following aspects: high oil content of asphalt concrete, asphalt sensitive to temperature, too few or broken coarse aggregate caused by lack of interlocking forces face down, Fine Aggregate excessive amount of river sand, asphalt concrete compaction can not meet the requirements and so on.The reasons for the formation of road owned package addition to the above aspects, there are two reasons: First, the heterogeneity of road c
