Preventive maintenance method for asphalt pavement of highway in mountainous area

Abstract

The invention provides a preventive maintenance method for an asphalt pavement of an expressway in a mountainous area, aims to improve the durability, safety and economical efficiency of a road, and is particularly suitable for the expressway in the mountainous area under the conditions of complex terrains and changeable climates. According to the method, various advanced technologies are combined, including pavement moisturizing maintenance, maintenance material spraying, temperature control construction and base layer treatment, preventive maintenance construction and later detection and maintenance, and early cracking, abrasion and aging of the asphalt pavement can be effectively prevented. Besides, specific technical measures adapting to high and cold areas, high rainfall areas, high altitude areas, earthquake-prone areas and the like are further provided according to the characteristics of different mountainous area environments, and it is guaranteed that the good performance and the service life of the road surface can be maintained under different climate and geological conditions. According to the method, by optimizing the maintenance technology, the construction quality and efficiency are improved, the later maintenance frequency and maintenance cost are reduced, and the method is an effective solution for long-term maintenance of the highway asphalt pavement in the mountainous area.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering, and in particular to a preventive maintenance method for asphalt pavement suitable for mountain highways. Background Art

[0002] With the rapid development of my country's transportation infrastructure, the construction scale of mountain highways has been expanding. However, due to the complex terrain, changeable climate conditions and increased traffic volume in mountainous areas, the asphalt pavement of mountain highways is prone to early defects such as cracks, potholes, and surface wear during long-term use. This will not only reduce the service life and driving comfort of the pavement, but may also increase the subsequent maintenance costs due to the aggravation of the disease.

[0003] Traditional asphalt pavement maintenance methods mainly focus on repairing and remediating diseases, and measures are often taken only when the disease is serious. This passive maintenance method easily leads to the expansion of pavement diseases and high maintenance costs. In modern road engineering, preventive maintenance methods have gradually become a hot spot for research and application due to their characteristics of "early detection and early treatment". Through early intervention in pavement diseases, pavement deterioration can be effectively delayed, maintenance costs throughout the life cycle can be reduced, and pavement performance can be improved.

[0004] Especially in mountainous highway environments, climate conditions (such as frequent rainfall and large temperature differences) and geological characteristics (such as karst landforms and landslide hazards) have a significant impact on the pavement structure. For example, long-term erosion by rainwater will accelerate the expansion of cracks in asphalt pavements, while freeze-thaw cycles in winter are more likely to cause pavement delamination and potholes. In addition, mountainous highways have a high proportion of bridges and tunnels, and the requirements for water resistance and flame retardancy of bridge decks and tunnel sections are more stringent. Traditional maintenance materials and construction technologies are difficult to meet the needs of these special environments.

[0005] In view of the above problems, it is urgent to develop a preventive maintenance method for asphalt pavement specifically for mountain highways to adapt to the complex climate and terrain characteristics of mountainous areas and improve the waterproofness, skid resistance and durability of the pavement. Through the combined application of intelligent construction equipment, environmentally friendly materials and a variety of preventive maintenance technologies, the service life of the pavement can be extended while reducing the impact of construction on the environment and ensuring the safe operation of mountain highways. Summary of the invention

[0006] Based on one main aspect of the present invention, a preventive maintenance method for asphalt pavement of a mountain highway is provided, including but not limited to the following steps:

[0007] Pavement moisturizing maintenance: After the asphalt surface layer is paved, cover it with non-woven fabric or plastic film and keep the road moist by regularly sprinkling or spraying water. During the maintenance period, control the surface temperature and humidity to prevent water evaporation and cracks. The maintenance time is 7 to 10 days;

[0008] After the asphalt surface layer is paved, it is immediately covered with non-woven fabric or plastic film to reduce water evaporation and keep the surface moist. The goal of this process is to avoid early cracks on the road surface caused by water loss. The curing time is appropriately adjusted according to local climatic conditions. In hot and dry areas, it can be extended to 12 days to ensure the moisturizing effect.

[0009] Intelligent maintenance material spraying, using intelligent asphalt spreaders to spray modified asphalt and emulsified asphalt, with the spraying thickness controlled at 0.3mm to 0.5mm, and protective baffles to prevent material splashing. At the same time, the automatic adjustment system ensures the uniformity of spraying and the adhesion of materials;

[0010] The spreader is equipped with a high-precision nozzle that can dynamically adjust the spraying angle and pressure according to road conditions to ensure uniform coverage.

[0011] Temperature-controlled construction and base treatment: clean the base before construction to ensure it is dust-free and dry, and adjust the construction temperature of the asphalt mixture to between 155°C and 165°C according to the ambient temperature. For tunnel or bridge deck construction areas, add flame retardants and take local ventilation and temperature control measures to ensure construction safety and quality;

[0012] During the construction process, it is necessary to configure a mobile heat radiation device to maintain the fluidity and plasticity of the asphalt mixture, especially in low temperature or high wind speed environments.

[0013] Preventive maintenance construction adopts one or more of the following methods to implement preventive maintenance:

[0014] a) Anti-crack sealing treatment: use hot melt caulking adhesive or modified cold caulking adhesive to fill the cracks, and apply an anti-crack sealing layer to prevent moisture penetration and crack expansion; preheat the area around the crack to 60℃ to 80℃ to improve the material's wetting ability.

[0015] b) Micro-surfacing construction, by spreading micro-surfacing materials to form a thin waterproof layer to improve the anti-skid and anti-aging properties of the road surface;

[0016] c) Thin-layer overlay construction: on severely worn pavement, a thin-layer overlay is constructed with a thickness of 15mm to 20mm to enhance the pavement's wear resistance and service life;

[0017] Post-testing and maintenance: After the construction is completed, the road surface flatness, skid resistance and water seepage performance will be tested, and a regular inspection mechanism will be established to promptly carry out local repairs and re-maintenance for possible wear, cracks or water seepage problems. A regional inspection mechanism will be established to conduct high-frequency inspections of key sections. For cracks and local wear problems found, local repairs and re-maintenance will be immediately carried out to prevent the problem from further expanding.

[0018] In some embodiments, as a further preferred scheme, the non-woven fabric or plastic film used for road surface moisturizing and maintenance is made of degradable materials. In the construction of mountain highways, the use of environmentally friendly materials can reduce the interference of the project on the natural environment. After maintenance, it can be directly recycled or naturally degraded, reducing the impact on the environment and achieving green construction.

[0019] In some embodiments, as a further preferred solution, when the protective layer is sprayed intelligently, the modified asphalt contains an anti-aging agent and a UV absorber to improve the durability and UV resistance of the protective film. In mountain highways that are exposed to high-intensity UV rays and complex climatic conditions for a long time, the road performance is more stable.

[0020] In some embodiments, as a further preferred solution, the spreader adopts a zone automatic adjustment technology when spraying, and adjusts the spraying thickness and coverage range in real time according to the road surface width, crack distribution and temperature.

[0021] In some embodiments, as a further preferred solution, the surface material of the thin layer surface repair is a fiber-reinforced asphalt mixture to further improve the crack resistance and fatigue resistance of the road surface. It is suitable for mountain highways with heavy traffic loads and significantly reduces the maintenance frequency caused by road fatigue damage.

[0022] In some embodiments, as a further preferred solution, the crack sealing process uses preheating technology to preheat the area around the crack to 60°C to 80°C through a dedicated heating device to enhance the bonding performance between the sealing material and the road surface, reduce the possibility of secondary crack expansion, enhance the bonding strength between the sealing material and the road surface, and improve the repair quality.

[0023] In some embodiments, as a further preferred solution, the paving thickness of the micro-surfacing construction is 8 mm to 10 mm, and the micro-surfacing material contains modified asphalt emulsifier and high-strength fiber to enhance the overall performance of the road surface, improve the anti-skid performance, waterproof performance and anti-aging performance of the micro-surfacing material, and form a high-performance thin waterproof protective layer.

[0024] In some embodiments, as a further preferred scheme, for tunnel or bridge deck construction, the addition ratio of flame retardant is 3% to 5% of the total weight of the asphalt material, which improves the safety performance of tunnels or bridge deck areas of mountain highways, reduces fire hazards, and meets fire safety requirements.

[0025] In some embodiments, as a further preferred solution, after the construction is completed, a high-precision laser device is used to detect the flatness of the road surface, and the flatness error is controlled within ±3mm to ensure the quality of road construction and the stability and comfort of highway driving.

[0026] In some embodiments, as a further preferred scheme, during the post-inspection and maintenance process, high-precision testing equipment is regularly used to conduct a comprehensive assessment of the road surface flatness, anti-skid performance and water permeability, and combined with the results of on-site inspections, local repairs and re-maintenance are carried out in a timely manner for wear, cracks and local damage problems.

[0027] According to different mountain highway environments, this method can flexibly adjust the maintenance process to meet diverse needs:

[0028] Alpine mountainous areas:

[0029] Add antifreeze agents (such as antifreeze modifiers) to asphalt mixtures to enhance the material's ability to resist freezing and thawing. Use low-temperature-resistant high-viscosity modified asphalt to improve the material's flexibility and crack resistance under low-temperature conditions.

[0030] During the maintenance process, the moisturizing maintenance time should be appropriately extended to prevent the base layer from losing water quickly in a low temperature environment. High-strength polymers should be added to the thin layer of covering material to further enhance the crack resistance.

[0031] Increase the construction thickness of the micro-surfacing (10mm to 12mm) to provide an additional layer of protection against erosion by snow-melting agents.

[0032] High rainfall areas:

[0033] High-density waterproof micro-surfacing materials are used, and water-repellent agents and hydrophobic modifiers are added to the materials to enhance water resistance. Nano-silicon compounds are added to modified emulsified asphalt to improve the impermeability of the waterproof layer.

[0034] When sealing cracks, hot melt grouting technology is used to ensure closure and prevent moisture penetration; during the spraying of maintenance materials, zoning adjustment technology is used to ensure a higher spraying thickness in areas prone to water accumulation such as ramps and bends.

[0035] Before construction, optimize the road drainage system, add side ditches and lateral drainage facilities to prevent long-term stagnation of water.

[0036] Heavy traffic roads:

[0037] Fiber-reinforced asphalt mixture is used in thin-layer overlay to enhance the material's fatigue resistance; ultra-high modulus asphalt is used to improve pavement durability.

[0038] Increase the construction thickness of the thin layer cover to 20mm to 25mm to enhance the surface bearing capacity; add high-strength reinforcing fibers in micro-surface construction to resist the long-term impact of heavy loads.

[0039] Shorten regular inspection cycles and promptly repair road cracks and local wear areas.

[0040] Earthquake-prone areas:

[0041] High-elastic asphalt mixture is used to improve the deformation adaptability and seismic resistance of the road surface; enhanced binders are used in the anti-cracking sealing layer to improve the tensile resistance.

[0042] Add a flexible protective layer (such as geogrid) to the base layer to disperse stress concentration and reduce the direct impact of vibration on the road surface; carry out special treatment on tunnels and bridge deck areas and use low-density, high-elasticity flame-retardant modified asphalt.

[0043] Regularly use high-precision laser equipment to detect road deformation and prevent the spread of hidden dangers.

[0044] High Altitude Areas:

[0045] Add UV absorbers and anti-aging agents to modified asphalt to slow down the aging of the material; select high-viscosity waterproof sealing materials to enhance the anti-aging performance of the protective layer.

[0046] Optimize the pressure and thickness control of the spraying equipment to ensure uniformity of spraying in high-altitude environments; during the moisturizing maintenance process, use environmentally friendly films with better covering performance to prevent rapid water loss due to temperature differences between day and night.

[0047] Increase inspection frequency in areas with high UV exposure, focusing on signs of aging.

[0048] Long tunnel and bridge deck areas:

[0049] The tunnel area uses high-durability, low-volatility flame-retardant asphalt, with a proportion of 3%-5% of the total weight. The bridge deck area is preferably made of fiber-reinforced materials to increase tensile strength and fatigue resistance.

[0050] During tunnel construction, ventilation and temperature control measures are taken to ensure the stability of asphalt material performance. When laying the bridge deck, a high-density waterproof isolation layer is set on the base to prevent water seepage.

[0051] Tunnel areas are cleaned of pollutants and tested for flame retardant material performance every quarter. Bridge deck areas are regularly inspected for sealing of joints and guardrail connections.

[0052] The above adaptation measures combine environmental characteristics and engineering requirements, and provide a comprehensive solution for the special environment of mountain highways from material selection, construction technology to post-testing. These measures not only optimize the performance of the road surface, but also improve the economy and sustainability of maintenance. The present invention can be applied efficiently under various complex conditions.

[0053] Advantages and beneficial effects of the present invention:

[0054] (1) Improve the service life of the road surface. By using high-performance materials such as modified asphalt and fiber-reinforced mixtures, the road surface's crack resistance, fatigue resistance, and aging resistance are greatly improved. Before serious road damage occurs, preventive treatments such as micro-surfacing and thin-layer overlays are carried out to delay the aging process of the road surface and reduce the frequency of damage. The overall service life of the road surface is significantly extended, and traffic interruptions caused by road damage are reduced.

[0055] (2) Improve road driving safety. Add modified emulsifiers and high-strength fibers to micro-surfacing materials and thin-layer overlays to improve the road's anti-skid performance and reduce the risk of slipping in rainy and snowy weather. Use high-precision laser equipment to detect construction flatness to ensure that the error is controlled within ±3mm, providing more stable road conditions for driving. Enhance vehicle driving safety and comfort, especially in complex road conditions in mountainous areas.

[0056] Through the comprehensive application of intelligent, environmentally friendly and high-performance materials, the present invention not only improves the durability and driving safety of the road surface, but also realizes the organic unity of construction efficiency, resource utilization and environmental protection. Its wide applicability and technical advantages in mountain highways provide a systematic solution for the field of road construction and maintenance, and have significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0058] Figure 1 It is a schematic diagram of the method steps of an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present invention will be described in detail below so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the following embodiments are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0060] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0061] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0062] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0063] like Figure 1 FIG. 1 is a schematic diagram of a preventive maintenance method for asphalt pavement of a mountain highway provided by an embodiment of the present invention. The specific implementation steps of an embodiment of the present invention are as follows:

[0064] 1. Pavement moisturizing maintenance

[0065] Film covering: Degradable polylactic acid film (PLA), thickness 0.025mm to 0.05mm, with air permeability and high-strength tensile properties. Completely decomposes within 6 months to 1 year under natural conditions. UV transmittance ≤5%, tensile strength ≥15MPa, thermal shrinkage ≤3%.

[0066] The road surface humidity is maintained at 50%-70%, and the ambient temperature is between 20℃ and 35℃. The frequency of watering is 4 to 5 times a day, and can be increased to 6 times in high-temperature areas. Atomized spraying is used, and the water pressure is ≤0.4MPa. The sprinkler truck is equipped with a humidity sensor and a quantitative spraying system.

[0067] In the high-cold mountainous areas, double-layer PLA film is used to enhance thermal insulation, and a hot air blower is used to maintain the temperature under the film at 20°C to 25°C at night. The frequency of spraying water is adjusted to once every 4 hours, and the humidity is always maintained at around 60%, and the crack rate of the asphalt surface has been reduced by 30%.

[0068] Adjust the curing time according to different climatic conditions. In hot and dry areas, the curing period is 10 to 12 days; in high-cold areas, use multi-layer film covering and equip with hot air equipment to maintain appropriate temperature and humidity.

[0069] 2. Intelligent maintenance material spraying

[0070] The modified asphalt contains 5%-7% anti-aging agent, 1%-3% ultraviolet absorber, and 2%-3% water repellent (nano silicon powder) to enhance the anti-water seepage performance.

[0071] The spraying thickness is controlled at 0.3mm to 0.5mm, and the thickness in heavy traffic areas is increased to 0.5mm to 0.7mm to ensure uniform coverage of the material without waste. The spraying temperature is maintained at 80℃ to 100℃ to prevent condensation and loss of the material. The spraying speed is 3km / h to 5km / h.

[0072] The spreader has built-in GPS positioning, thickness adjustment and zone spraying functions, which can dynamically adjust the spraying thickness and speed according to the road conditions to ensure uniform spraying. Real-time thickness monitoring equipment dynamically monitors the asphalt spraying thickness.

[0073] For ramp areas with a greater risk of water accumulation, modified emulsified asphalt is sprayed with a thickness of 0.5mm. A spray truck equipped with a GPS positioning system ensures that the spraying uniformity on the ramp edge reaches more than 95%.

[0074] 3. Temperature control construction and base treatment

[0075] Use high-pressure air flow equipment to clean the base to ensure that it is dust-free and free of debris. The temperature of the cleaned base must reach the minimum temperature required for construction, above 10°C. The construction temperature of the asphalt mixture is maintained at 155°C to 165°C to ensure good fluidity and plasticity. During the construction process, use a heat radiation device to maintain the temperature difference between the base and the asphalt within 5°C.

[0076] The flame retardant is added in a proportion of 3%-5% of the total weight of asphalt. The oxygen index of asphalt treated with flame retardant reached 33% in the test, meeting the fire safety requirements of the tunnel. During construction, the thermal radiation equipment stabilized the asphalt temperature at 160°C, ensuring a uniform paving effect.

[0077] 4. Preventive maintenance construction

[0078] Preheat the cracks to 60℃ to 80℃, and fill the cracks with hot melt caulking glue or modified cold caulking glue. The filling depth of the sealing layer should reach 80%-90% of the crack depth.

[0079] The paving thickness is 8mm to 10mm, and modified emulsifiers and high-strength fiber materials are used to improve the road surface's anti-skid, waterproof and anti-aging properties. The thin-layer overlay material uses fiber-reinforced asphalt mixture with a thickness of 15mm to 20mm, which is particularly suitable for heavy-load sections and severely worn roads.

[0080] 5. Post-testing and maintenance

[0081] Carry out regular inspections on the road surface after construction to ensure stable road performance, and perform local repairs in a timely manner based on the inspection results.

[0082] After the construction is completed, the road surface flatness is tested using a laser flatness tester to ensure that the error does not exceed ±3mm. For areas that need repair, timely remedial treatment is carried out, and all data are recorded by high-precision instruments. The friction coefficient tester is used to ensure that the friction coefficient is ≥0.4, which is suitable for mountain road conditions and high rain conditions. A regular inspection mechanism is established to conduct high-frequency inspections on key sections (such as ramps and curves) and repair local wear and cracks in a timely manner. High traffic areas: once a quarter. General areas: once every six months.

[0083] According to the test results, timely carry out local repairs for serious wear, cracks or water seepage problems. The repair process can be combined with local maintenance measures to ensure that local damage does not spread to a wider area. Establish a regular inspection mechanism to regularly check and record the performance of the road surface, especially in high-risk areas such as mountain tunnels and bridge decks.

[0084] The maintenance method of the present invention is slightly different due to different regional environments:

[0085] For high-cold areas: add antifreeze (lignin 5%-8%) to enhance the ability to resist freezing and thawing, and use hot sheds and hot air equipment to maintain the temperature of the construction area during nighttime construction. Since the low temperature causes the water to evaporate slowly, the moisturizing maintenance time is appropriately extended to 10 to 14 days to ensure that the asphalt surface is moist and avoid cracks.

[0086] For high rainfall areas: use high-density waterproof micro-surfacing materials, add water repellent and hydrophobic modifiers to enhance surface waterproofing performance, prevent crack expansion caused by water seepage, and drainage facility design must meet the needs of high rainfall areas.

[0087] For heavy traffic roads: use high modulus asphalt and fiber-reinforced overlay to improve the road bearing capacity, and increase the thickness of the thin layer overlay to 20mm to 25mm to ensure sufficient compressive resistance.

[0088] For earthquake-prone areas: Add highly elastic polymers to asphalt to enhance the road's adaptability to earthquake vibrations and reduce cracks and damage caused by vibrations. Add an elastic material layer between the road surface and the base layer to effectively disperse vibration stress and reduce road deformation. Perform high-frequency road surface inspections after an earthquake, especially on key sections such as bridge decks and tunnels, to ensure that no serious structural damage has occurred.

[0089] For high altitude areas: UV absorbers and anti-aging agents are added to modified asphalt to slow down the aging process of the material, especially in high UV environments, to ensure that the asphalt maintains good physical properties for a long time. Due to the large temperature difference between day and night in high altitude areas, insulation layer and covering film technology are used during construction to keep the road surface temperature and humidity stable.

[0090] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0091] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A preventive maintenance method for asphalt pavement of mountain highway, characterized in that: Including but not limited to the following steps: Pavement moisturizing maintenance: After the asphalt surface layer is paved, cover it with non-woven fabric or plastic film and keep the road moist by regularly sprinkling or spraying water. During the maintenance period, control the surface temperature and humidity to prevent water evaporation and cracks. The maintenance time is 7 to 10 days; Spraying of maintenance materials: using asphalt spreaders to spray modified asphalt and emulsified asphalt, the spraying thickness is controlled at 0.3mm to 0.5mm, and protective baffles are set to prevent material splashing. At the same time, the automatic adjustment system is used to ensure the uniformity of spraying and the adhesion performance of materials; Temperature-controlled construction and base treatment: clean the base before construction to ensure it is dust-free and dry, and adjust the construction temperature of the asphalt mixture to between 155°C and 165°C according to the ambient temperature. For tunnel or bridge deck construction areas, add flame retardants and take local ventilation and temperature control measures to ensure construction safety and quality; Preventive maintenance construction adopts one or more of the following methods to implement preventive maintenance: a) Anti-crack sealing treatment: use hot melt caulking glue or modified cold caulking glue to fill the cracks and apply an anti-crack sealing layer to prevent moisture penetration and crack expansion; b) Micro-surfacing construction, by spreading micro-surfacing materials to form a thin waterproof layer to improve the anti-skid and anti-aging properties of the road surface; c) Thin-layer overlay construction: on severely worn pavement, a thin-layer overlay is constructed with a thickness of 15mm to 20mm to enhance the pavement's wear resistance and service life; Post-inspection and maintenance: After the construction is completed, the road surface flatness, skid resistance and water permeability performance will be tested, and a regular inspection mechanism will be established to carry out local repairs and re-maintenance in a timely manner for possible wear, cracks or water seepage problems.

2. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: The non-woven fabric or plastic film for road surface moisture retention and maintenance is made of degradable material.

3. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: When the protective layer is sprayed intelligently, the modified asphalt contains an anti-aging agent and an ultraviolet absorber to improve the durability and anti-ultraviolet ability of the protective film.

4. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: The spreader adopts the zone automatic adjustment technology when spraying, and adjusts the spraying thickness and coverage range in real time according to the road surface width, crack distribution and temperature.

5. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: The surface material of the thin layer surface repair is a fiber-reinforced asphalt mixture to further improve the crack resistance and fatigue resistance of the road surface.

6. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: The crack sealing process uses a preheating technology to preheat the area around the crack to 60° C. to 80° C. using a dedicated heating device to enhance the bonding performance between the sealing material and the road surface.

7. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: The paving thickness of the micro-surfacing construction is 8 mm to 10 mm, and the micro-surfacing material contains modified asphalt emulsifier and high-strength fiber.

8. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1 is characterized in that: For tunnel or bridge deck construction, the flame retardant is added in a proportion of 3% to 5% of the total weight of the asphalt material.

9. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1, characterized in that: After the construction is completed, high-precision laser equipment is used to detect the flatness of the road surface, and the flatness error is controlled within ±3mm.

10. The preventive maintenance method for asphalt pavement of mountain highway according to claim 1, characterized in that: During the post-inspection and maintenance process, high-precision testing equipment is regularly used to conduct a comprehensive assessment of the road surface flatness, anti-skid performance and water permeability performance, and combined with the results of on-site inspections, local repairs and re-maintenance are carried out in a timely manner for wear, cracks and local damage problems.

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