Category of Asphalt Pavement
| wangkiky 2019 | ||
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According to different asphalt material type can be divided into: petroleum asphalt pavement,coal asphalt pavement, natural asphalt and residual-oil pavement . But the common classification is according to their construction methods, technical quality and the use features: asphalt concrete pavement, gravel plant asphalt pavement, asphalt penetration pavement ,crushed stone mixture (gravel) road mix asphalt pavement and asphalt surface treatment pavement.
Asphalt concrete pavement It is the pavement compacted from the surface which the aggregate, slag and asphalt appropriate proportion of various particle size, after heated to a certain temperature and mixed Plant mixed asphalt pavement,said the black gravel pavement or open-graded asphalt concrete pavement. Processing technology and paving asphalt concrete pavement close to the process, but its larger pores (the dividing line is not critical and China to the porosity of 10% cut-off). Asphalt Macadam with hot mix hot shop can also be mixed with cold hot shop; good quality hot shop, with a little bit more common. Aggregate particles have the same particle gradation and have the points, the use of those who have graded. Compared to concrete and asphalt, less fine aggregate and asphalt content of slag gravel, a large proportion of coarse aggregate, asphalt content is correspondingly less. Asphalt macadam mixture mainly depends on the thermal stability of the lock knot strength of aggregate particles, so mix and aggregate gradation range of fluctuation of the asphalt content, consistency, mix asphalt concrete is comparable width, while still holding its thermal stability. But because it is porous, the surface is easy to water seepage and aging, it is commonly used in the lower surface of the asphalt gravel layer, link layer, leveling layer and the substrate. If the upper layer of the road surface shall be added to asphalt seal coat or embedded sprinkle fine asphalt. But there are also spread it over a dense asphalt surface, as water-permeable layer of slip. Life tarmac generally shorter than the asphalt concrete pavement, but the project cost is often more inexpensive. asphalt penetration pavement,it is poured forming a class of asphalt pavement. The asphalt poured on the paved main layer aggregate, then layered spreading stone chips and poured asphalt caulking, hierarchical compaction, forming a dense layer of asphalt structure. Advantages poured construction equipment is simple, easy to transport materials; the drawback is the large impact of the construction climate, and the final shape will take some time, the road is not as good as plant mixed asphalt pavement Asphalt pavement smooth and beautiful, the addition of floating ash molding sand, and possibly weeping. To overcome this, we can put the last layer of poured asphalt and stone chips spreading to ready-mix paving asphalt fines to reduce the floating dust forming and accelerate and facilitate surface drainage. Thermal stability penetration pavement mainly rely on rough sets lock junction between the material forces, so the amount of asphalt and asphalt are not as sensitive consistency of asphalt concrete pavement, the road close to the nature of the position and application layer of asphalt and gravel road surface. Asphalt pavement heat penetration method of construction, construction method can also be cold. Construction thermal heating viscous asphalt poured on cold aggregate, forming the road faster for urban roads and heavy traffic roads; emulsified asphalt poured cold cold construction method, but need to be emulsified asphalt splitting water after evaporation of water to the initial shape for the conservation and minor repairs and a heating device difficult long-distance roads. Penetration style with aggregate particles should be close to the same particle size aggregate to asphalt to fully penetrate the main floor, and caulking uniform thickness; the maximum particle size of aggregate main layer thickness should be close to the surface or surface layer 0.7 to 0.8 times the thickness; the aggregate should be clean and free of dust, dry surface. Crushed stone mixture (gravel) road mix asphalt pavement, road mixing method is a stoker in the road bed, poured the right amount of asphalt, and then use mechanical or artificial mix, paving and compacting. Unable heated roadbed aggregate and therefore require consistency dilute bitumen emulsion or as a liquid asphalt binder, when emulsified asphalt mixing infrequently heated liquid asphalt can be heated by a high flash point. When humid climate, also need to add an anti-stripping agent or cationic emulsion asphalt in the asphalt, or incorporated in a mix of cement, lime, etc., in order to increase the wet aggregate and asphalt adhesion. Mix asphalt road due to various conditions, the nature of which road is better mix asphalt plant, but can save energy and transportation costs to and from place of sand stone, commonly used for secondary roads or rural roads. Related Sites: [url=http://roadroutercrack.com/blog-new/324.html]Bitumen Sprayer Operating Skills[/url] [url=http://roadcuttingmachine.com/blog/2896.html]Refractory Concrete Pavement Trowel[/url] [url=http://roadcuttingmachine.com/blog/3287.html]Rain Asphalt Sprayer Manufacturer[/url] [url=http://roadroutercrack.com/blog-new/559.html]high tech asphalt sealer calculator[/url] |
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