Synchronous crushed stone seal is the use of special equipment to synchronize the gravel seal car gravel and asphalt cementing materials simultaneously sprinkled on the road surface to form the protection of the original road asphalt gravel wear layer. The seal layer has high strength, rough surface, non-slip, impermeable, good durability,Road Router Crack to prevent rain water mist and so on.
According to statistics, more than 95% of the roads in Europe are using this technology for conservation, in the country is still a new type of conservation technology.Stone crushed stone seal construction technology:
1. Requirement: From the point of view of preventive maintenance of asphalt pavement, the synchronous crushed stone sealing technology does not put forward higher requirements for construction conditions compared with other technologies. However,Road Cutting Machine in order to improve the maintenance performance, The advantages of new technology, or need to have certain conditions. First of all, the road surface damage should be diagnosed, to clear the key issues to be repaired; full consideration of asphalt binder and aggregate quality standards, such as its wettability, adhesion, abrasion resistance,Good quality manufacturer of leaf blowers compression resistance; Technical specifications to allow the scope of the paving operation; the right and rational choice of materials to determine the level, the correct operation of paving equipment.
2, synchronous gravel seal construction process: (1) commonly used structure: the general use of intermittent gradation structure, crushed stone sealing layer of stone particle size range with strict requirements, that is the best size stone. Taking into account the difficulty of stone processing and anti-skid performance requirements of the road can be 2 ~ 4mm, 4 ~ 6mm, 6 ~ 10mm, 8 ~ 12mm, 10 ~ 14mm 5 files, the more commonly used particle size range of 4 ~ 6mm , 6 ~ 10mm these two, and 8 ~ 12mm and 10 ~ 14mm two stalls are mainly used for low-grade road transition in the lower layer or the middle layer.
(2) According to the road surface smoothness and anti-skid performance requirements to determine the stone particle size range. General road cover can be a gravel seal layer, poor in road surface roughness can be said to use the appropriate size of the stone as the lower sealing layer leveling,Saving gasoline slot machines and then do the sealing layer. Gravel seal as a low-grade highway pavement to be 2 or 3 layers, each layer of stone particle size should be matched with each other to produce embedded crowded role, generally follow the principle of coarse under the fine;
(3) before the sealing layer of the original road surface should be carefully cleaned, the operation process should ensure that a sufficient number of rubber roller in order to reduce the temperature of asphalt or emulsified asphalt demulsification before rolling to complete the positioning process in time. In addition, after the closure layer can be opened to traffic, but in the early should limit the speed, to be completely open after 2h traffic, so as to prevent rapid traffic caused by stone splash;
(4) When using the modified asphalt as the binder, in order to ensure uniform spray, uniform thickness of the asphalt film, we must ensure that the temperature of asphalt in the 160 ℃ ~ 170 ℃ range;
(5) The thickness of the asphalt film is different because of the different injector height of the synchronous gravel vehicle (because the overlap of the fan-shaped fog asphalt sprayed by each nozzle is different), the thickness of the asphalt film is adjusted by adjusting the nozzle height Claim;
(6) synchronous gravel seal car should be the appropriate speed of uniform driving, in which the premise of stone and binder material must be the spread of the two match rate;
(7) as a surface layer or wear layer of gravel seal layer, the use of the conditions of the original road surface roughness and strength to meet the requirements.
Material of the synchronous gravel seal:
1, binder. Synchronous gravel sealing technology leading performance is high, but the application of asphalt is not particularly stringent requirements. Different bituminous binders such as softened asphalt, polymer modified asphalt, emulsified asphalt, polymer modified emulsified asphalt, diluted bitumen and the like can be used. Hot asphalt is mainly due to large-scale sealing.
2, stone. The crushed stone requires crushing (or hammer crushing) to obtain the crushed stone, needle-like stone strictly controlled within 15%, geometric size is better, free of impurities and stone powder, crushing value of less than 14% No special requirements, and strictly after washing dry.
