I. Overview of asphalt pavement
It refers to the incorporation of asphalt road paving material asphalt pavement in various types of mineral material. Asphalt binder to improve the ability to resist road paving aggregates and natural factors on the road damage, so that the pavement less dust, waterproof, durable. Thus, the asphalt pavement is advanced road construction of one of the most widely used. Asphalt pavement asphalt class structure layer itself, belong to the category of flexible pavement, but in addition to its grassroots flexible material, may also be rigid concrete or semi-rigid hydraulic material.
Second, the asphalt pavement construction materials
Asphalt pavement is asphalt to paving, asphalt pavement rolling forming various types of pavement formed. Asphalt is a bituminous material has a certain viscosity and an appropriate amount of certain mineral aggregate gradation, after full mixing mixture formation. Asphalt concrete pavement materials as asphalt, to bear in the course of the exercise of the role of repeated vehicle loads, and long-term environmental factors. So asphalt concrete have a certain affordability must also have good resistance to natural factors durability. That is, to be able to exhibit sufficient stability under high temperature, crack resistance under low-temperature conditions, good water stability, long-lasting aging resistance and slip resistance in favor of security features to ensure that the asphalt pavement good service functions.
  Asphalt concrete pavement for the construction of bituminous material mainly asphalt and coal tar pitch, in addition, there are natural asphalt. Some countries or regions are also using or mixing of asphalt mixed with natural. Press aggregates used different varieties can be divided into gravel, gravel, sandy, several types of slag, crushed stone using the most common. The nature and grade requirements asphalt with asphalt pavement type, traffic conditions and regional climate sections vary; hot mix or thermal and poured in hot areas and heavy traffic roads should use thicker asphalt; or cold mix France poured cold and in cold regions and light traffic roads should use more dilute bitumen.
Third, the method of asphalt pavement construction
Spraying method pavement surface
Asphalt pavement construction method by spraying the asphalt surface and asphalt Treatment penetration two, Treatment asphalt surface with asphalt and mineral aggregate fines layered paving a thickness of no more than 3cm thin pavement, usually using layup method of construction, according to the number of spraying spreading asphalt and mineral aggregate level can be divided into single-level, two-tier and three-tier three kinds of single-layer and double layer of three-tier part . Colored asphalt pavement
The third layer Surface Treatment Construction
Clean up the grass, the front surface of Treatment of construction, road base should be cleaned so that the grassroots mine material most exposed and kept dry; if the overall lack of grass-roots strength, it should first be reinforced.
   Sprinkled through the layer (or adhesive layer) asphalt, spraying the first layer of asphalt to spraying uniform, when found after spraying asphalt blank, when the lack of edge, sprinkle immediately fill with the work, there is accumulation should be scraped immediately. Construction should use asphalt distributor asphalt spraying, spraying its length should be coordinated with the mineral aggregate spreading capability. Asphalt cloth construction should be based on the temperature and the temperature of the asphalt label to determine, under normal circumstances, petroleum pitch is preferably 130 ℃ ~ 170 ℃, coal tar pitch is preferably 80 ℃ ~ 120 ℃, emulsified asphalt should be dispersed at room temperature.
   Spreading the first layer of mineral aggregate: After spraying the main layer of asphalt, mineral aggregate immediately with the spreader or workers spreading the first layer of mineral aggregate. Mineral aggregate spreading evenly to achieve full coverage layer, uniform thickness, mineral aggregate do not overlap, do not reveal the asphalt, when there is a local shortage of material or excessive, it shall be appropriate Zhaobu or sweeping.
   RCC: After spreading some mineral aggregate, with 60 ~ 80kN Tandem roller compacted. When rolling, should be pressed against the side of the curb of the road, rolling should be 3 to 4 times the speed began to not more than 2km / h, may be increased later.
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