1、英文文献 Highway asphalt pavement Preventive Maintenance Abstract: The high-grade highway asphalt pavement and damaged the various early stage disease, the type of damage and its causes, and made a crack repair, slurry seal asphalt pavement, such as preventive conservation technology. Key words: asphalt
2、 pavement； conservation asphalt pavement and the type of damage causes type of damage The asphalt pavement damage can be divided into: crack category, loose category, class and other types of deformation of the four major categories Causes (1) horizontal cracks in this relatively common disease, mai
3、nly due to contraction of asphalt surface temperature and semi-rigid or temperature shrinkage of the shrinkage caused. Roadbed degree of compaction less than this will lead to disease (2) vertical cracks in most cases took place in a half filled or half-dug embankment road widening, mainly from the
4、roadbed caused by uneven settlement. (3) cracking along its initial shape is round with a single trace or more of parallel vertical joints, gradually appeared in the horizontal or vertical Feng Jian oblique connection joints cracking form. Mainly due to lack of structural strength from the road (4)
5、along the road to track performance with a horizontal height difference, mainly because of foot-graded asphalt mixture design unreasonable. Poor or because of the stability of the grass-roots level and degree of compaction of the lack of construction so that the wheel tracks with the material and la
6、yer and grass-roots role in the traffic load has repeatedly appeared in the consolidation of lateral shear deformation and displacement caused. In addition, the overloading of heavy vehicles and also produce too many of the important reasons for rutting (5) is the main reason for the wave of road co
7、nstruction material design unreasonable or of poor quality, the road leading to insufficient material level of resistance Mou round of the role: Zongpo paragraph, because the high temperature will cause such diseases (6) loose water damage occurred mainly in the section on the serious. (7) pits is c
8、racked and loose, and other damage to the further development of the results. (8) embankment subsidence is mainly caused by insufficient degree of compaction, especially in some high-filling and compaction difficult to fill a half-dug sections and structures at both ends of a (9) If the spalling asp
9、halt Mixture using neutral or acid stone, will cause aggregate and asphalt adhesion b s (10) Fan You asphalt Mixture too much asphalt content, porosity smaller, high temperature stability poor, is the main reason for a Fanyou asphalt pavement Preventive Maintenance Technology Asphalt Pavement Preven
10、tive Maintenance Technology: repair cracks, slurry seal, the closure of the Stone Chip, the closure of the table and micro-thin heat Overlay (including open-graded, Miji and with intermittent grading). Here focus of slurry seal and repair cracks in technology. repair cracks in technology and methods
11、 slotted repair method Slotted repair method for small and medium-sized cracks. Crack is a better approach. The equipment used slot machines and irrigation sewing machine to make up for joint use of materials designed specifically for repairing cracks in the sealed plastic (polymer modified asphalt)
12、, slotting size of at least l cm wide, l 3 cm deep. Slotted than the depth should not exceed 2: l, greater depth than the smaller the better. Slotted repair of the construction process are as follows: preparations for the inspection slot machines and irrigation sewing machine to ensure that its tech
13、nical condition: Pavement cracks under the specific circumstances to determine fill slit design: sewing machine and start filling the tank sealant heating add sealant, sealant heating , Stirring to l90 , can not exceed 200 ； heating during the sewing machine Tuogua irrigation in the truck behind, an
14、d the sealant, Geli Dun, the umbrella label instructions, and Shoulder-style slot machines, such as hair dryer mounted on trucks, Shi T locations scheduled to drag on a safe highway maintenance of order (JTG H30-2004) as the provisions of the construction area operations. slotted in accordance with
15、the design of the slot size, good pre-conditioning F-slot machine slot depth, and then slotted operations, operations, according to crack width type of situation, timely adjustment slotted sizes to meet the minimum design requirements. Shoulder-to-trough hair dryer to bed and cracks on both sides of
16、 the ejecta l0 till at least within the scope of cleaning dust thoroughly clean. irrigation in the seam if the temperature below the 4:00-slit. Irrigation with a sewing machine to be slotted parts of the preheating equipment for preheating, if not at this temperature preheat to fill the joints, seal
17、ants would reduce the cohesive force: if the temperature higher than the 4 at the joint meeting, From time to preheat, the general meeting of the joint after preheating better results, in sealed plastic heating temperature reached about 190 , with irrigation with a sewing machine for pressure nozzle
18、 Guaping sealant will be evenly Guanru bed and Crack drag on both sides of a certain width and thickness of the closure. conservation irrigation joint sealant, sealed in plastic and the full cooling ejecta on the roads after sweeping clean, open to traffic. As cooling time for about 15 min, the spec
19、ific time and opening up under the traffic situation in temperature flexibility non-slotted repair (the traditional repair method) Non-slotted for the repair of micro-cracks to repair, according to the use of different materials, such repair method can be divided into hot-and cold-two kinds. AU-l lO
20、 # heavy oil traffic hot asphalt-hot-melt asphalt construction machinery and equipment spraying equipment (installed in the car project). The rotation of the preparatory work preparation heating melt -down AH-l l0 # heavy oil traffic around the asphalt cracks remove dust straddle spraying hot melt a
21、sphalt oil hand-Moping natural cooling open traffic . modified emulsified asphalt cold-construction Modification of emulsified asphalt is a mixture of liquid-cold materials, machinery equipment without special request, after the stirring scene of artificial joints Guatu letters (at least three times
22、) preparations for the construction technology-artificial joints Banliao people on the Guatu curing secondary Guatu curing three Guatu Kang opening of traffic (curing time l5 20 min). traditional repair method for repairing and slotted the comparison to the traditional repair method, whether it is r
23、e-used to transport oil or pieces of asphalt emulsion asphalt irrigation joints, although Oxfam j equipment almost no input costs, lower cost of the initial application T, but with the surface temperature of contraction and the grassroots up to 1 year, after the repair of cracks and joints location
24、of the original irrigation re-cracking, fire accounted for more than 80 percent efficiency, so the second year of re-repair This regular maintenance, not only increased the cost of conservation and conservation of the frequent traffic of the operation will cause inconvenience and anxiety umbrella fa
25、ctors. Every five years Yanmi r-total cost of about l5 yuan. the slotted-repair, although the initial investment cost of higher construction equipment. Higher initial construction cost, but greatly extend its service life, sealing cracks in the effective and efficient artificial increase, the use of
26、 5 years later, slotting-repair cracks in the efficient handling of 85% in five years for each of the Yanmi Cost is about ll yuan traditional repair method for dealing with micro-cracks and small and medium-sized cracks in the temporary emergency treatment: barrel-repair cracks in the small and medi
27、um-sized carry out a repair can be maintained for more than five years, benefited from a repair for many years. slurry seal Slurry seal technology for the new and old road of aging, cracking, smooth, loose, pits and other diseases can play a role in the prevention and maintenance, so that the road w
28、aterproof, anti-slide, formation, the rapid increase wear resistance. In recent years. Because slurry seal of the standardization, standardization, improve construction quality and reduced costs, slurry seal has been widely used in the Highway Maintenance early on. modified emulsified asphalt slurry
29、 seal Modification of emulsified asphalt is a high-temperature flow, low temperature brittle fracture resistance, weatherability, abrasion resistance, ageing resistance excellent road paving material, the lower coefficient of the road flooding, road management of the disease early, increasing the ro
30、ad And the formation of friction coefficient, a very good role. Modification of emulsified asphalt slurry seal from the water quality is a polymer modified asphalt emulsion and rolling broken-intensive materials, mineral fillers, additives and water treatment consisting of surface layer, can be char
31、acterized by a thin layer Paver, solidified quickly, the main Construction for the road was repaired, cracking, rutting, and other diseases of treatment, can also be used for sealing and enhance the anti-sliding surface treatment. However, modified emulsified asphalt slurries and other TLC treatment
32、, apply only to sections of the existing structure and stability, not enough deflection value to be reinforced after construction. and other road compared to the conservation methods with hot asphalt mixture of paved compared to hot asphalt mixture paving thickness of 2.5 cm, cost per square metre l
33、8 20 yuan modified emulsified asphalt paving slurry seal thickness of 1 cm, cost per square metre l3 Around yuan, the average service life of six to eight years, uh, saving 15 percent of asphalt to 20 percent, according to the road 1 1 m wide of shells savings of 8.8 per km to 110,000 yuan. Because
34、the modified emulsified asphalt slurry seal in more than 5 to the construction, extension of time can be 1 to 2 months, and reduce environmental pollution, the construction is simple, reduce labor intensity, energy saving equipment. Construction of improved conditions. general emulsified asphalt slurry seal open when asked transport needs of 4 h, emulsified asphalt modified slurry seal when asked open as long as 0.5 1 h, traffic disruption or
