A high-performance polyurethane mixture pavement structure and construction method thereof

Abstract

The present invention discloses a high-performance polyurethane mixture pavement structure and a construction method thereof, belonging to the technical field of road construction. The structure comprises, from bottom to top, a base layer, a seal layer, a cushion layer, a second bonding layer, and a polyurethane surface layer. The cushion layer comprises a modified fine-grained asphalt mixture. The second bonding layer comprises a high-viscosity modified emulsified asphalt. The polyurethane surface layer comprises a polyurethane mixture. During the demulsification process, 40% of the water in the modified emulsified asphalt in the bonding layer of the present invention evaporates into the interlayer of the polyurethane mixture, accelerating the curing reaction of the polyurethane layer. This solves the problem that when the lower portion of the polyurethane mixture layer is a highly waterproof cushion layer, the lower half of the polyurethane layer cannot receive water, resulting in an excessively long curing time. A cushion layer is provided beneath the polyurethane mixture surface layer to provide stress dispersion and buffering functions, while also providing waterproof and crack-resistant protection for the base layer, effectively solving the problem of slurry pumping.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction, and in particular relates to a high-performance polyurethane mixture pavement structure and a construction method thereof. Background Art

[0002] Against the backdrop of the current rapid development of the domestic transportation industry and the continuous development of new asphalt pavement material technologies, various materials have emerged to address the problems of asphalt pavement cracking under high temperatures, heavy loads, and low temperatures. However, these materials cannot completely resolve the problems of rutting, congestion, and low-temperature cracking caused by channeled heavy-load traffic. The durability of the pavement still cannot meet the requirements of large traffic volumes. At the same time, asphalt pavements are still mainly hot-mixed and hot-paved. In the current context of advocating low-carbon emission reduction and environmental protection, the transportation construction industry has become a major energy consumer and carbon emitter.

[0003] Polyurethane mixtures have become a new direction for road traffic applications due to their ultra-high high-temperature stability, excellent low-temperature crack resistance, and the remarkable characteristics of cold-mix and cold-laying, which requires no fuel for heating and consumes little energy. Some regions have conducted research and experiments on polyurethane pavements, but their construction techniques differ significantly from those of ordinary hot-mix asphalt mixtures. These techniques all present the following problems, hindering their large-scale application: 1. The high cost of polyurethane, which is used exclusively as the permeate, bonding, and surface layers, significantly increases the cost of raw materials. 2. The high dynamic viscosity of polyurethane prevents large-scale mechanical spraying. Multiple layers of polyurethane overlap, making uniform application difficult and affecting the smoothness of the road surface. 3. After spraying, polyurethane needs to absorb external moisture to solidify. The overlapping of multiple layers of polyurethane results in a long curing time for the road surface, impacting the construction period. Summary of the Invention

[0004] The object of the present invention is to provide a high-performance polyurethane mixture pavement structure and a construction method thereof to solve the problems in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-performance polyurethane mixture pavement structure comprises, from bottom to top, a base layer, a seal layer, a cushion layer, a second bonding layer and a polyurethane surface layer; the cushion layer comprises a modified asphalt fine-grained mixture; the second bonding layer comprises high-viscosity modified emulsified asphalt; and the polyurethane surface layer comprises a polyurethane mixture.

[0007] Furthermore, when applied to the reconstruction of old roads, the base layer is the old road base layer; the sealing layer is the old road sealing layer, and the lower layer is arranged on the top.

[0008] Furthermore, a first bonding layer is provided between the lower layer and the cushion layer, and the first bonding layer is modified emulsified asphalt bonding oil.

[0009] Furthermore, when used in new road construction, the top surface of the base layer is sprinkled with high-permeability emulsified asphalt; and the sealing layer is a modified asphalt gravel sealing layer.

[0010] A construction method for a high-performance polyurethane mixture pavement structure comprises the following steps:

[0011] S1. Construction of base layer and sealing layer;

[0012] S2. Construction of the cushion layer: First, use a paver to spread the material, then roll the cushion layer to make it smooth;

[0013] S3, construction of the second bonding layer and polyurethane surface layer;

[0014] S31, mixing and storing polyurethane mixture;

[0015] S32, transportation of polyurethane mixture;

[0016] S33: The second bonding layer and the polyurethane surface layer are paved in one piece; a synchronous integrated paver is used to spread the high-viscosity modified emulsified asphalt and polyurethane mixture;

[0017] S34, road surface rolling: After the paver has been paving continuously for minutes, the polyurethane surface layer is rolled to make the surface smooth;

[0018] S4. Road surface maintenance: After compaction is completed, traffic will be closed. When the road surface reaches the stability requirement, traffic will be opened.

[0019] Furthermore, when applied to old road reconstruction, step S1 includes:

[0020] S11. Mill the old road surface, retain the base layer, seal layer, and lower layer, and clean them. Then test the deflection value index and make reinforcement adjustments to the locations that do not meet the requirements to ensure that the bearing capacity of the base layer meets the design traffic volume requirements.

[0021] S12. Treat cracks in the lower layer. If the crack length exceeds 5 meters, mill the crack to the base layer, milling the area 25cm on both sides of the crack and clean it. Then, spread an emulsified asphalt adhesive layer along the milled surface, backfill the asphalt mixture, and compact it. Finally, lay a layer of fiberglass grid on the asphalt mixture surface as an anti-cracking layer, with the edge of the fiberglass grid extending 30cm beyond the edge of the milling position.

[0022] S13. Construction of the first bonding layer: Sprinkle emulsified asphalt bonding oil on the surface of the lower layer.

[0023] Furthermore, when applied to new road construction, step S1 includes:

[0024] S11. Construction of the base layer: After the base layer construction is completed, check whether there are cracks on the surface of the base layer. If there are cracks, blow away the dust in the cracks and inject cement slurry through 5mm micro-holes until it is full.

[0025] S12. Clean the surface of the base layer and spread high-permeability emulsified asphalt as a penetration layer;

[0026] S13. Lay fiberglass grid on high-permeability emulsified asphalt at the corresponding crack location of the base layer, with the edge of the fiberglass grid extending 25cm beyond the crack edge;

[0027] S14. Spread modified asphalt and synchronous chip seal as the sealing layer.

[0028] Furthermore, in step S33, a high-power industrial atomizing humidifier is installed on the screed plate of the paver, and the pipeline of the industrial atomizing humidifier is connected to the top of the mixing cage tank, and the industrial atomizing humidifier and the paver mixing cage work synchronously.

[0029] Furthermore, in step S34, the wheels of the rolling equipment used are all coated with a mixture of vegetable oil and diesel as an isolation agent.

[0030] Furthermore, in step S34, after the paver has been paving continuously for minutes, initial compaction is carried out. The initial compaction uses a 13-ton double-steel wheel roller to perform static compaction twice, and the compaction is carried out in sections, always maintaining a 30-minute paving length for the paver; the secondary compaction uses a double-steel wheel roller to perform vibratory compaction three times; and the final compaction uses an 18-ton light tire roller to perform finishing compaction twice.

[0031] The present invention has the following beneficial effects:

[0032] 1. The present invention provides a high-performance polyurethane mixture pavement structure and a construction method thereof. During the demulsification process of the modified emulsified asphalt in the bonding layer, 40% of the water evaporates into the interlayer of the polyurethane mixture, accelerating the curing reaction of the polyurethane layer. This solves the problem that when the lower part of the polyurethane mixture layer is a cushion layer with strong waterproof performance, the lower half of the polyurethane layer cannot obtain water supply, resulting in an excessively long hardening and curing time.

[0033] 2. If the underlying layer of the polyurethane mixture pavement is directly a semi-rigid base layer, the polyurethane mixture will only produce elastic deformation under vehicle load, and the stress will be concentratedly transferred to the base layer. Under heavy traffic, it is easy to cause a more direct impact on the base layer, and voids are easy to form. Under the action of precipitation, fatigue cracking is easy to occur, and slurry pumping disease is gradually formed, which slowly causes the polyurethane mixture layer to break and be damaged. The present invention provides a high-performance polyurethane mixture pavement structure and a construction method thereof. A mattress layer is arranged under the polyurethane mixture surface layer to play a stress dispersion and buffering function, and at the same time has a waterproof and crack-resistant base layer protection function, which serves as a necessary functional layer to match the polyurethane mixture surface layer and effectively solves the slurry pumping disease.

[0034] 3. The present invention provides a high-performance polyurethane mixture pavement structure and a construction method thereof. When the polyurethane is spread, an industrial atomizing humidifier is used in synchronous operation to disperse the atomized water in the mixture, thereby providing the mixture with the required water in a timely manner.

[0035] 4. The present invention provides a high-performance polyurethane mixture pavement structure and a construction method thereof, which adopts a synchronous integrated paver with an automatic leveling function to carry out paving operations of high-viscosity modified emulsified asphalt and polyurethane mixture. The high-viscosity modified emulsified asphalt is sprayed onto the working surface using the emulsified asphalt storage tank and spraying device provided by the synchronous integrated paver, and then the polyurethane mixture is spread and covered on the bonding layer to avoid sticking of the material truck wheels and the paver tracks, resulting in strip-shaped oil marks without bonding layer and the creation of a potential risk of falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the pavement structure of Example 1 involved in the present utility model.

[0037] Figure 2 This is a schematic diagram of the pavement structure of Example 2 involved in the present utility model.

[0038] In the figure: 1-base layer, 2-sealing layer, 3-lower layer, 4-first adhesive layer, 5-cushion layer, 6-second adhesive layer, 7-polyurethane surface layer. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] Example 1

[0041] The high-performance polyurethane mixture pavement structure provided in this embodiment is applied to the reconstruction of old roads, such as Figure 1 As shown, from bottom to top, it includes a base layer 1, a sealing layer 2, a lower layer 3, a first bonding layer 4, a cushion layer 5, a second bonding layer 6 and a polyurethane surface layer 7; the cushion layer 5 includes a modified asphalt fine-grained mixture; the second bonding layer 6 includes a high-viscosity modified emulsified asphalt; and the polyurethane surface layer 7 includes a polyurethane mixture.

[0042] If the old road base layer is intact, the base layer 1 is the old road base layer; if the old road seal layer is intact, the seal layer 2 is the old road seal layer; if the old road sublayer is intact, the sublayer 3 is the old road sublayer; when there are partial cracks in the old road sublayer, milling is carried out at the corresponding crack positions in the old road sublayer to the base layer 1, and the milling position is backfilled with dense graded modified asphalt mixture.

[0043] The first bonding layer 4 includes modified emulsified asphalt bonding oil.

[0044] The cushion layer 5 is preferably SBS modified asphalt AC-10 type fine-grained mixture with a layer thickness of 2-2.5 cm. Its raw materials and mixture indicators meet the relevant requirements of the "Technical Specifications for Asphalt Pavement Construction", among which the mixture porosity is 2.5%-4% and the asphalt content is 6.0%-7.0%.

[0045] The moisture content of the aggregate used in the cushion layer 5 and the polyurethane surface layer 7 should not exceed 0.3%. If the aggregate moisture content exceeds 0.3% during pre-construction testing, it should be dried at 120°C and cooled to ambient temperature before use. Therefore, aggregate manufacturers are required to use dry dust removal methods for aggregate production and transport them to the mixing site using fully enclosed transport vehicles. Aggregate storage at the mixing site should have a hardened concrete floor, be rainproof and moisture-proof, and be 10-15 cm above the ground outside the shed. Aggregate should be stored in separate bins according to particle size.

[0046] The technical indicators of the high-viscosity modified emulsified asphalt in the second bonding layer 6 meet the relevant indicator requirements in the "Technical Specifications for Asphalt Pavement Construction", among which the evaporation residue content should be greater than 60%.

[0047] The thickness of the polyurethane surface layer 7 is 5-7 cm. The polyurethane material used in the polyurethane surface layer 7 should be within its factory expiration date. The storage tanks at the mixing plant should be dry, clean, airtight, and free of debris. A breathing valve should be installed on the tank top to prevent the polyurethane material from coming into contact with the outside air, which could cause curing and deterioration.

[0048] This embodiment also provides a construction method for a high-performance polyurethane mixture pavement structure, which is applied to old road reconstruction and includes the following steps:

[0049] S1, construction of base layer 1, sealing layer 2 and lower layer 3;

[0050] S11. Mill the old road surface, retaining the old base layer, seal layer, and lower layers. Clean the surface thoroughly, remove the pancake-like interlayer, and then test the deflection value to ensure that the bearing capacity of the base layer 1 meets the design traffic requirements. If the deflection value does not meet the design requirements or there are local completion indicators that exceed the standards, after demarcating the scope, take measures such as excavation and replacement to rebuild the base layer 1 structure or grouting reinforcement to improve the bearing capacity of the base layer 1 until it meets the design indicators.

[0051] S12. Treat cracks in the lower layer 3. If the crack length exceeds 5 meters, mill the crack to the base layer 1, milling the area 25 cm on both sides of the crack and clean it. Then, spread an emulsified asphalt adhesive layer along the milled surface, backfill the asphalt mixture, and compact it. Finally, lay a layer of fiberglass grid on the asphalt mixture surface as an anti-cracking layer, with the edge of the fiberglass grid extending 30 cm beyond the edge of the milling position.

[0052] S2, construction of the first bonding layer 4: Sprinkle emulsified asphalt bonding oil on the surface of the lower layer 3 to form the first bonding layer 4;

[0053] S3. Construction of cushion layer 5: First, a paver with an automatic leveling function is used for paving. When paving the cushion layer 5 mixture, the automatic leveling function of the paver is used to achieve a smooth and even paving surface. After paving, a double steel wheel roller is used for initial compaction once, followed by two secondary compaction passes, and then an 18-ton light tire roller is used for finishing twice to increase the surface roughness, improve the pavement density and waterproof performance.

[0054] S4, construction of the second bonding layer 6 and the polyurethane surface layer 7;

[0055] S41. Mixing and storage of polyurethane mixture: Use a batch mixer and mix at room temperature. All aggregates do not need to be heated. During the storage of polyurethane, temperature-controlled electric heaters are installed in the storage tanks and delivery pipelines. During low-temperature construction, they are heated to ensure that the temperature of the polyurethane material entering the mixing tank is not lower than 25°C.

[0056] S42. Transportation of polyurethane mixture: The polyurethane mixture should not be left for too long after leaving the machine. Minimize contact with the outside air. Use a closed transport vehicle for transportation, preferably a bulk grain transport vehicle. The transport vehicle should be equipped with an integrated closed steel roof and a bottom-mounted screw feeder. The interior of the vehicle should be evenly coated with an oil-based release agent to effectively prevent rain and avoid contact with air.

[0057] S43: The second bonding layer 6 and the polyurethane surface layer 7 are paved integrally. A synchronous integrated paver with an automatic leveling function is used to pave the high-viscosity modified emulsified asphalt and polyurethane mixture. The synchronous integrated paver uses its own emulsified asphalt storage tank and spraying device to spray the high-viscosity modified emulsified asphalt onto the working surface. The polyurethane mixture is then spread over the second bonding layer 6 to prevent the wheels of the material truck and the paver tracks from sticking to each other, resulting in strip-shaped traces of no bonding layer oil and a potential risk of shedding.

[0058] S44, road surface rolling: After the paver has been paving continuously for 30 minutes, initial compaction is carried out. The initial compaction uses a 13-ton double-steel-wheel roller with two static pressing passes, and the rolling is carried out in sections. The paver is always kept at a 30-minute paving length to allow time for the initial reaction of the paved surface mixture and the discharge of the carbon dioxide generated by the reaction. The secondary compaction uses a double-steel-wheel roller with three vibratory rolling passes, and it is appropriate to achieve the optimal density by on-site testing with a non-nuclear density meter. The final compaction uses an 18-ton light tire roller with two smoothing passes to eliminate wheel marks.

[0059] S5. Pavement curing: After compaction is completed, traffic is strictly closed and all vehicles are prohibited from entering the working surface. When the climate is dry and the air humidity is lower than 60%, an atomizing water truck is used to evenly spray water mist on the polyurethane pavement on the roadside. After curing for 24 hours, a pavement coring machine is used to take cores to test the stability. When the stability reaches more than 85% of the indoor proportion design standard parts, traffic is opened.

[0060] In step S41, the mixing equipment mixes and mixes the ingredients according to the designed mix ratio in each plate. The mixing time is based on whether the discharged material is evenly coated. The criterion for judging whether the coated material is evenly coated is: after the discharge, ten particles are randomly selected and visually observed to have no more than one pinhole-sized uncoated area on the surface of the particles.

[0061] In step S41, the mixing equipment should measure accurately, with a measurement error of no more than 0.5%.

[0062] In step S43, a high-power industrial atomizing humidifier is installed on the screed of the paver. The industrial atomizing humidifier uses the generator of the paver as its power source and is powered by an inverter. The slot on the paver's mixing cage is covered with a layer of transparent organic glass plate, and the pipeline of the industrial atomizing humidifier is connected to the top of the mixing cage slot. During the paving operation, as the paver's mixing cage spirally operates, the industrial atomizing humidifier operates synchronously to spread the polyurethane mixture to the working surface, and the atomized water is synchronously dispersed in the polyurethane mixture to provide the polyurethane mixture with the moisture required for paving. The rammer of the paver's screed adopts a low-speed vibration frequency, and the screed vibrating leveler adopts a 60% vibration frequency, so that the density of the pavement is slightly lower and the gap is slightly larger, which is conducive to further uniform absorption of moisture by the polyurethane mixture.

[0063] In step S44, all roller wheels are coated with a mixture of vegetable oil and diesel in a ratio of 1:1 as an isolation agent, and a special roller brush is installed on the rolling wheel to apply the oil evenly.

[0064] The old road base, recording permeable layer and seal layer, and the old road sub-layer are used as the base layer 1, seal layer 2, and sub-layer 3, SBS modified asphalt AC-10 type fine-grained mixture is used as the cushion layer 5, high-viscosity modified emulsified asphalt is used as the second bonding layer 6, and polyurethane mixture is used as the polyurethane surface layer 7, with a thickness of 6 cm. The construction is carried out according to the above construction steps, and the performance test is carried out according to the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011). The performance results are shown in Table 1:

[0065] Table 1 Performance results of Example 1

[0066] Test items unit Test results Remark Freeze-thaw splitting strength ％ 85 / 60℃ dynamic stability times / mm 76000 / Stability kN 77 87% of indoor standard parts Time required for health preservation h 24 / Water consumption L / ㎡ 0.5-0.8 Emulsification and demulsification evaporation 40% + on-site spraying

[0067] Example 2

[0068] This embodiment provides a high-performance polyurethane mixture pavement structure, which is applied to new road construction, such as Figure 1 As shown, from bottom to top, it includes a base layer 1, a sealing layer 2, a cushion layer 5, a second bonding layer 6 and a polyurethane surface layer 7; the cushion layer 5 includes a modified asphalt fine-grained mixture; the second bonding layer 6 includes a high-viscosity modified emulsified asphalt; and the polyurethane surface layer 7 includes a polyurethane mixture.

[0069] High-permeability emulsified asphalt is spread on the top surface of base 1 as a permeable layer. Base 1 adopts cement-stabilized crushed stone base with a strength of not less than 4.5MPa.

[0070] The seal layer 2 is a modified asphalt chip seal layer. Preferably, the chip specifications of the modified asphalt synchronous chip seal layer are 3-5 mm; the full paving rate is 70%-80%; and the modified asphalt spreading amount is 0.8-1.0 kg per square meter.

[0071] The moisture content of the aggregate used in the base layer 1, the cushion layer 5 and the polyurethane surface layer 7 is not greater than 0.3%.

[0072] This embodiment also provides a construction method of a high-performance polyurethane mixture pavement structure, comprising the following steps: S1, construction of a base layer 1 and a sealing layer 2;

[0073] S11, construction of base layer 1; after completion of construction, check whether there are cracks on the surface of base layer 1. If there are cracks, blow away the dust in the cracks and inject cement slurry through 5mm micro-holes until they are full;

[0074] S12. Clean the surface of base layer 1 and spread high-permeability emulsified asphalt as a permeable layer at a rate of 0.7-1.2 kg per square meter. S13. Lay fiberglass grating on the high-permeability emulsified asphalt at the crack location of base layer 1, with the edge of the fiberglass grating extending 25 cm beyond the crack edge.

[0075] S14. Spread 5mm modified asphalt and simultaneous chip seal as seal layer 2; the modified asphalt spreading amount is 0.8-1.0kg per square meter.

[0076] S2, construction of mattress layer 5;

[0077] S3, construction of the second bonding layer 6 and the polyurethane surface layer 7;

[0078] S4. Road surface health care.

[0079] The rest is the same as that of the first embodiment.

[0080] The cement-stabilized crushed stone structure is used as the base layer 1, the modified asphalt synchronous crushed stone seal is used as the seal layer 2, the SBS modified asphalt AC-10 type fine-grained mixture is used as the cushion layer 5, and the paving thickness is 2 cm. The high-viscosity modified emulsified asphalt is used as the bonding layer 6, and the polyurethane mixture is used as the polyurethane surface layer 7, and the thickness is 6 cm. The construction is carried out according to the above construction steps, and the performance test is carried out according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011). The performance results are shown in Table 2:

[0081] Table 2 Performance results of Example 2

[0082] Test items unit Test results Remark Freeze-thaw splitting strength ％ 85 / 60℃ dynamic stability times / mm 75000 / Stability kN 75 / Time required for health preservation h 24 / Water consumption L / ㎡ 0.5-0.8 Emulsified asphalt 40% + on-site spraying water

[0083] Comparative Example 3

[0084] A cement-stabilized macadam structure served as base layer 1, a modified asphalt synchronous macadam seal served as seal layer 2, an SBS modified asphalt AC-10 fine-grained mixture served as cushion layer 5, laid to a thickness of 2 cm, a single-component polyurethane served as second bonding layer 6, and a polyurethane mixture served as polyurethane surface layer 7, laid to a thickness of 6 cm. Construction was carried out using the construction method used in Example 2, except that polyurethane surface layer 7 was laid after second bonding layer 6 was laid in step S3. Performance testing was then conducted according to the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011). The performance results are shown in Table 3:

[0085] Table 3 Performance results of comparative example 3

[0086]

[0087]

[0088] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a high-performance polyurethane mixture pavement structure, characterized in that: The method comprises, from bottom to top, a base layer (1), a sealing layer (2), a cushion layer (5), a second adhesive layer (6) and a polyurethane surface layer (7), and specifically comprises the following steps: S1, construction of base layer (1) and sealing layer (2); S2, construction of the cushion layer (5); first, using a paver to perform paving construction, and then rolling the cushion layer (5) to make its surface smooth; the cushion layer (5) includes a modified asphalt fine-grained mixture; the cushion layer (5) is waterproof; S3, construction of the second bonding layer (6) and the polyurethane surface layer (7); the second bonding layer (6) comprises high-viscosity modified emulsified asphalt; the polyurethane surface layer (7) comprises a polyurethane mixture; during the demulsification process of the high-viscosity modified emulsified asphalt of the second bonding layer (6), the water therein evaporates into the interlayer of the polyurethane mixture, thereby accelerating the curing reaction of the polyurethane layer; S31, mixing and storing polyurethane mixture; S32, transportation of polyurethane mixture; S33, the second bonding layer (6) and the polyurethane surface layer (7) are paved in an integrated manner; a synchronous integrated paver is used to perform paving operations on a mixture of high-viscosity modified emulsified asphalt and polyurethane; a high-power industrial atomizing humidifier is installed on the screed of the paver, and the pipeline of the industrial atomizing humidifier is connected to the top of the mixing cage tank, and the industrial atomizing humidifier and the paver mixing cage work synchronously; S34, road surface rolling; after the paver has been paving continuously for 30 minutes, the polyurethane surface layer (7) is rolled to make the surface smooth; S4. Road surface maintenance: After compaction is completed, traffic will be closed. When the road surface reaches the stability requirement, traffic will be opened.

2. The construction method of a high-performance polyurethane mixture pavement structure according to claim 1, characterized in that: When used in old road reconstruction, the base layer (1) is the old road base layer; the sealing layer (2) is the old road sealing layer, and a lower layer (3) is arranged on top of the sealing layer.

3. The construction method of a high-performance polyurethane mixture pavement structure according to claim 2, characterized in that: A first bonding layer (4) is provided between the lower layer (3) and the cushion layer (5), and the first bonding layer (4) is a modified emulsified asphalt bonding oil.

4. The construction method of a high-performance polyurethane mixture pavement structure according to claim 1, characterized in that: When used in new road construction, the top surface of the base layer (1) is sprinkled with high-permeability emulsified asphalt; and the sealing layer (2) is a modified asphalt gravel sealing layer.

5. The construction method of a high-performance polyurethane mixture pavement structure according to claim 3, characterized in that: When applied to old road reconstruction, step S1 includes: S11. Mill the old road surface, retain the base layer, seal layer and lower layer of the old road, and clean them. Then test the deflection value index and make reinforcement adjustments to the positions that do not meet the requirements to ensure that the base layer (1) bearing capacity meets the design traffic volume requirements; S12, crack treatment of the lower layer (3); if the crack length exceeds 5 meters, the corresponding crack is milled to the base layer (1), the milling range is 25cm on both sides of the crack, and it is cleaned; then, an emulsified asphalt adhesive layer is spread along the milling surface, the asphalt mixture is backfilled, and compacted; then, a layer of fiberglass grid is laid on the surface of the asphalt mixture as an anti-cracking layer, and the edge of the fiberglass grid extends 30cm beyond the edge of the milling position; S13, construction of the first bonding layer (4); spreading emulsified asphalt bonding oil on the surface of the lower layer (3).

6. The construction method of a high-performance polyurethane mixture pavement structure according to claim 1, characterized in that: When applied to new road construction, step S1 includes: S11, construction of base layer (1); after the construction of base layer (1) is completed, check whether there are cracks on the surface of base layer (1). If there are cracks, blow away the dust in the cracks and inject cement slurry through 5mm micro-holes until it is full; S12, clean the surface of the base layer (1) and spread high-permeability emulsified asphalt as a penetration layer; S13. Lay fiberglass grid on the high-permeability emulsified asphalt at the crack location of the base layer (1), with the edge of the fiberglass grid extending 25 cm beyond the crack edge; S14, spreading modified asphalt synchronous chip seal as seal layer (2).

7. The construction method of a high-performance polyurethane mixture pavement structure according to claim 1, characterized in that: In step S34, the wheels of the rolling equipment used are all coated with a mixture of vegetable oil and diesel as an isolation agent.

8. The construction method of a high-performance polyurethane mixture pavement structure according to claim 1, characterized in that: In step S34, after the paver has been paving continuously for 30 minutes, initial compaction is carried out. The initial compaction uses a 13-ton double-steel wheel roller for static compaction twice, and the compaction is carried out in sections, always maintaining a 30-minute paving length for the paver; the secondary compaction uses a double-steel wheel roller for vibration compaction three times; and the final compaction uses an 18-ton light tire roller for finishing twice.

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