A self-cleaning durable drainage pavement structure and its laying method

Abstract

The present invention belongs to the technical field of road engineering, and specifically discloses a self-cleaning durable drainage pavement structure and a laying method thereof, including a pavement unit and a drainage unit, wherein the pavement unit includes an upper layer, a bonding layer, a middle layer, a waterproof bonding layer, a lower layer, a stress absorbing layer and a base layer arranged in sequence from top to bottom; the upper layer adopts a superelastic porous mixture, the bonding layer adopts a polyurethane modified emulsified asphalt, the middle layer adopts a porous asphalt mixture, the waterproof bonding layer adopts hot-sprayed modified asphalt, the lower layer adopts a high modulus asphalt mixture, the stress absorbing layer adopts a rubber asphalt mortar, and the base layer adopts cement stabilized gravel; the height of the drainage unit is lower than the height of the waterproof bonding layer. The drainage pavement structure of this technical solution has the ability of self-cleaning holes, strong anti-blocking and anti-heavy load capabilities, and can achieve dual durability of structure and function.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering, and in particular relates to a self-cleaning durable drainage pavement structure and a paving method thereof. Background Art

[0002] At present, the construction of transportation infrastructure has shifted from "high-speed development" to "high-quality development". Higher requirements are placed on the service comfort, safety and durability of highways. Insufficient anti-skid performance of the road surface is a major cause of traffic accidents. From the perspective of traffic safety, rainy days can easily form water films or even water accumulation on the road, reducing the adhesion between vehicle tires and the road surface and thus affecting road driving safety. According to statistics, 40% of traffic accidents in the country are related to rain every year, and the accident rate on rainy days is 9 times that on sunny days. How to improve the anti-skid performance of the road surface on rainy days is a hot issue that many researchers are concerned about.

[0003] Drainage pavement can quickly drain surface water from the road surface through its well-developed interconnected gaps, thereby reducing the thickness of the water film and driving water mist on the road surface, improving the road surface's anti-skid performance and reducing the incidence of driving accidents in rainy days. However, during the use of drainage asphalt pavement, the asphalt mixture will show a trend of compaction under the effect of vehicle load, resulting in a gradual decrease in the void ratio. In addition, the dust on the road surface and environmental garbage enter the pavement void structure and cause blockage, which reduces the drainage function of the drainage asphalt pavement and the safety of driving in rainy days. At the same time, with the development of transportation, the proportion of heavy-load traffic has increased, causing the early damage of drainage asphalt pavement, such as loosening, peeling, and rutting, to become more serious. Summary of the invention

[0004] In response to the above problems, the present invention focuses on both traffic safety and structural safety, and aims to provide a drainage pavement structure with self-cleaning capability, excellent anti-clogging and anti-heavy load performance, and dual long-term and durable drainage function and structural performance.

[0005] In order to achieve the above-mentioned purpose, a technical solution of the present invention is: a self-cleaning durable drainage pavement structure, including a pavement unit and a drainage unit, the pavement unit includes an upper layer, a bonding layer, a middle layer, a waterproof bonding layer, a lower layer, a stress absorption layer and a base layer arranged in sequence from top to bottom; the upper layer adopts a super-elastic porous mixture, the bonding layer adopts polyurethane-modified emulsified asphalt, the middle layer adopts a porous asphalt mixture, the waterproof bonding layer adopts hot-sprayed modified asphalt, the lower layer adopts a high modulus asphalt mixture, the stress absorption layer adopts rubber asphalt mortar, and the base layer adopts cement-stabilized gravel; the height of the drainage unit is lower than the height of the waterproof bonding layer, the drainage unit includes a drainage ditch, a cover plate and a filter screen, the cover plate is arranged at the water inlet position of the drainage ditch, and the cover plate is provided with a drainage hole; the filter screen is arranged on the cover plate.

[0006] Furthermore, the thickness of the upper layer is 25-40 mm, and the amount of the adhesive layer is 0.3-0.6 L / m 2 The thickness of the middle surface layer is 40-60 mm, and the dosage of the waterproof adhesive layer is 1.5-1.8 L / m 2 , the thickness of the lower layer is 50-70mm.

[0007] Furthermore, the porosity of the super-elastic porous mixture is 18-22%, and the super-elastic porous mixture includes graded stone, rubber particles, polyurethane or high-viscosity and high-elastic composite modified asphalt; the amount of polyurethane or high-viscosity and high-elastic composite modified asphalt added is 4-6% of the amount of graded stone added, the polyurethane uses a slow-reacting single-component polyurethane adhesive, and the amount of rubber particles added is 6%-12% of the amount of graded stone added.

[0008] Furthermore, the amount of polyurethane added in the polyurethane-modified emulsified asphalt: the amount of emulsified asphalt added = 5:95, and the polyurethane is a slow-reacting single-component polyurethane adhesive.

[0009] Furthermore, the porosity of the porous asphalt mixture is 20%-25%, and the porous asphalt mixture includes graded stone, high-viscosity and high-elasticity composite modified asphalt and basalt fiber. The amount of high-viscosity and high-elasticity composite modified asphalt added is 3%-5% of the amount of graded stone added, and the amount of basalt fiber added is 0.1%-0.5% of the amount of graded stone added.

[0010] Furthermore, the dynamic modulus of the high modulus asphalt mixture at 15°C is not less than 14000 MPa, the high modulus asphalt mixture comprises graded stone and low-grade asphalt, and the amount of the low-grade asphalt added is 3%-5% of the amount of the graded stone added.

[0011] Furthermore, the preparation method of the rubber asphalt mortar is: firstly spread the rubber asphalt, the spreading amount is 2-3kg / m 2 , and then spread the gravel while it is still hot. The maximum particle size of the gravel is 9.5mm, and the proportion of gravel with a particle size of 9.5mm is greater than 85%. The spreading amount is 17-20kg / m 2 .

[0012] Furthermore, the high-viscosity and high-elasticity composite modified asphalt includes a high viscosity agent and an SBS modified asphalt, and the added amount of the high viscosity agent: the added amount of the SBS modified asphalt = 10:90.

[0013] Furthermore, the drainage ditch is a mortar-laid flagstone rectangular drainage ditch, and the depth and width of the drainage ditch are both 0.4-0.6m; the cover plate is a reinforced concrete cover plate with drainage holes; the filter screen is a stainless steel filter screen, and the wire diameter of the filter screen is 0.12-0.19mm and the pore size is 0.38-1.08mm.

[0014] In order to achieve the above object, another technical solution of the present invention is: a method for laying a self-cleaning durable drainage pavement structure, which is used to lay the aforementioned self-cleaning durable drainage pavement structure, comprising the following steps:

[0015] Build the base, and after completion, spread the stress absorbing layer on the base;

[0016] The lower layer is laid on the stress absorbing layer, and after the paving is completed, a waterproof bonding layer is spread on the lower layer;

[0017] The middle surface layer and the upper surface layer are laid on the waterproof bonding layer, and the middle surface layer and the upper surface layer are bonded with an adhesive layer;

[0018] Construct the drainage unit, the height of which is lower than the height of the waterproof bonding layer.

[0019] The beneficial effects of this technical solution are:

[0020] The self-cleaning durable drainage pavement structure of this technical solution has strong anti-blocking and anti-heavy load capabilities, and is safe and durable. In terms of traffic safety, the double-layer drainage layer (upper layer and middle layer) is designed to quickly drain the surface water out of the road through the well-developed interconnected gaps inside, thereby reducing the water film thickness and driving water mist on the road surface, improving the anti-skid performance of the road surface and reducing the incidence of driving accidents on rainy days. The wear resistance of the super-elastic porous mixture of the upper layer is better than that of ordinary drainage pavement, making the anti-skid ability of the surface layer more durable. At the same time, from the perspective of the overall structure, the double-layer drainage pavement with super-elastic porous mixture as the upper layer has three advantages. First, the upper layer super-elastic porous mixture can increase the dynamic water pressure inside the double-layer drainage pavement under the load of vehicles on rainy days by relying on its ultra-high elasticity, and then produce a "siphon" effect that can effectively remove the dust inside the blocked channel, making it have good anti-blocking ability and "self-cleaning" effect. Second, the low porosity of the upper layer of the double-layer drainage structure will cause the blocked area to shift upward, making it easier for maintenance personnel to use vacuum and flushing methods to remove blockages. Third, the finer gaps in the upper layer can filter large particles of debris and prevent the lower layer from being blocked. Therefore, the drainage and anti-skid functions of the drainage pavement structure designed by the present invention are more durable. At the same time, the lower layer adopts a high-modulus asphalt mixture to significantly enhance the overall shear resistance and fatigue resistance of the pavement. The upper layer adopts a super-elastic porous mixture with excellent anti-rutting performance. Rubber asphalt mortar is used as a stress absorption layer to alleviate the occurrence of reflective cracks, thereby comprehensively improving the pavement's resistance to heavy loads and fatigue, and extending the overall durability of the pavement. The pavement's auxiliary drainage system is designed as a filtering drainage ditch, and the filter can filter accumulated water and debris in the environment, further enhancing the drainage effect of the drainage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a self-cleaning durable drainage pavement structure of the present invention;

[0022] Figure 2 The plot of the variation of the depth with wear time for PERS-13 and PAC-13 structures;

[0023] Figure 3 The graphs of the pendulum values ​​of PERS-13 and PAC-13 changing with wear time;

[0024] Figure 4 Dynamic stability diagram of PERS-13 and PAC-13. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The figure marks in the drawings of the specification include: upper layer 1, adhesive layer 2, middle layer 3, waterproof bonding layer 4, lower layer 5, stress absorption layer 6, base layer 7, drainage pipe 8, cover plate 9, filter screen 10.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe 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 creative work are within the scope of protection of the present invention.

[0028] Basically as attached Figure 1 As shown: a self-cleaning durable drainage pavement structure includes a pavement unit and a drainage unit. The pavement unit includes an upper layer 1, an adhesive layer 2, a middle layer 3, a waterproof bonding layer 4, a lower layer 5, a stress absorption layer 6 and a base layer 7 which are arranged in sequence from top to bottom.

[0029] The upper layer 1 adopts the super elastic porous mixture PERS-13, and the thickness of the upper layer 1 is 25-40mm; the porosity of the super elastic porous mixture is 18-22%, and the super elastic porous mixture includes graded stone, rubber particles, polyurethane or high viscosity and high elastic composite modified asphalt; the amount (mass) of polyurethane or high viscosity and high elastic composite modified asphalt added is 4-6% of the amount (mass) of graded stone added, and the amount (mass) of rubber particles added is 6%-12% of the amount (mass) of graded stone added. The high viscosity and high elastic composite modified asphalt includes high viscosity and SBS modified asphalt, and the amount of high viscosity added: the amount of SBS modified asphalt added = 10:90. Polyurethane is a slow-reacting single-component polyurethane adhesive.

[0030] Adhesive layer 2 uses polyurethane modified emulsified asphalt. The amount of polyurethane added in the polyurethane modified emulsified asphalt: the amount of emulsified asphalt added = 5:95. The polyurethane uses a slow-reacting single-component polyurethane adhesive. The amount of adhesive layer 2 is 0.3-0.6L / m 2 .

[0031] The middle surface layer 3 adopts porous asphalt mixture PAC-16, and the thickness of the middle surface layer 3 is 40-60mm; the porosity of the porous asphalt mixture is 20%-25%, and the porous asphalt mixture includes graded stone, high-viscosity and high-elastic composite modified asphalt and basalt fiber, and the addition amount (mass) of high-viscosity and high-elastic composite modified asphalt is 3%-5% of the addition amount (mass) of graded stone, and the addition amount (mass) of basalt fiber is 0.1%-0.5% of the addition amount (mass) of graded stone. The high-viscosity and high-elastic composite modified asphalt includes high viscosity and SBS modified asphalt, and the addition amount of high viscosity: the addition amount of SBS modified asphalt = 10:90.

[0032] The waterproof bonding layer 4 is made of hot-sprayed modified asphalt, and the dosage of the waterproof bonding layer 4 is 1.5-1.8L / m 2 .

[0033] The lower layer 5 uses high modulus asphalt mixture HMAC-20, and the thickness of the lower layer 5 is 50-70mm. The dynamic modulus of the high modulus asphalt mixture at 15°C is ≥14000MPa. The high modulus asphalt mixture includes graded stone and low-grade asphalt. The addition amount (mass) of the low-grade asphalt is 3%-5% of the addition amount (mass) of the graded stone, and the low-grade asphalt is 15-30# base asphalt.

[0034] The stress absorption layer 6 is made of rubber asphalt mortar, and the preparation method is as follows: first spread the rubber asphalt, and the spreading amount is 2-3kg / m 2 , and then spread the gravel while it is still hot. The maximum particle size of the gravel is 9.5mm, and the proportion of gravel with a particle size of 9.5mm is greater than 85%. The spreading amount is 17-20kg / m 2 .

[0035] The base layer 7 adopts cement stabilized crushed stone base layer 7. The working principle of cement stabilized crushed stone: cement stabilized crushed stone uses graded crushed stone as aggregate, uses a certain amount of cementitious materials and sufficient mortar volume to fill the gaps between aggregates, and spreads and compacts according to the interlocking principle. Its compaction degree is close to density, and its strength mainly depends on the interlocking principle between crushed stones, and at the same time, there is enough mortar volume to fill the gaps between aggregates.

[0036] The height of the drainage unit is lower than the height of the waterproof bonding layer 4. The drainage unit includes a drainage ditch, a cover plate 9 and a filter screen 10. The cover plate 9 is arranged at the water inlet position of the drainage ditch, and a drainage hole is arranged on the cover plate 9; the filter screen 10 is arranged on the cover plate 9. The drainage ditch is a mortar-laid slab rectangular drainage ditch, and the depth and width of the drainage ditch are both 0.4-0.6m; the cover plate 9 is a reinforced concrete cover plate 9 with drainage holes; the filter screen 10 is a stainless steel filter screen 10, and the wire diameter of the filter screen 10 is 0.12-0.19mm and the aperture is 0.38-1.08mm.

[0037] The method for laying a self-cleaning durable drainage pavement structure comprises the following steps:

[0038] S1: constructing a base layer 7, and spreading a stress absorbing layer 6 on the base layer 7 after the construction is completed;

[0039] S2: Laying the lower layer 5 on the stress absorbing layer 6, and spreading the waterproof adhesive layer 4 on the lower layer 5 after the paving is completed;

[0040] S3: laying the middle surface layer 3 and the upper surface layer 1 on the waterproof adhesive layer 4, and bonding the middle surface layer 3 and the upper surface layer 1 with the adhesive layer 2;

[0041] S4: construct a drainage unit, the height of which is lower than the height of the waterproof bonding layer 4.

[0042] 1. The following is a comparison of the anti-clogging capabilities of different drainage pavement structures to verify the durability of the drainage function of the double-layer drainage pavement of the present invention:

[0043] The scheme of Example 1 is (double-layer drainage pavement): the upper layer uses 4 cm of super elastic porous mixture PERS-13, the middle layer uses 4 cm of porous asphalt mixture PAC-16, and the tack layer uses polyurethane modified emulsified asphalt, with a dosage of 0.5 L / m 2 .

[0044] The scheme of comparative example 1 is (double-layer drainage pavement): the upper layer uses 4 cm porous asphalt mixture PAC-13, the middle layer uses 4 cm porous asphalt mixture PAC-16, and the tack layer uses emulsified asphalt with a dosage of 0.5 L / m 2 .

[0045] The scheme of comparative example 2 (single-layer drainage pavement) is: 4 cm porous asphalt mixture PAC-13 and 4 cm medium-grained asphalt concrete AC-16 are used, and the interlayers are bonded with emulsified asphalt at a dosage of 0.5 L / m 2 .

[0046] The gradation of PERS-13 is shown in Table 1. When designing the gradation, rubber particles are added by replacing the same-size stone with equal volume. The amount of rubber particles is 8% of the graded stone, the amount of polyurethane is 4.9% of the graded stone, and the void ratio is 19%. The gradation of PAC-13 is shown in Table 2, the oil-stone ratio is 4.9, the void ratio is 20%, and the basalt fiber content is 0.1% of the graded stone. The gradation of PAC-16 is shown in Table 3, the oil-stone ratio is 5.0, the void ratio is 21%, and the basalt fiber content is 0.1% of the graded stone.

[0047] The indoor test simulates the anti-clogging ability of drainage pavement under realistic conditions, specifically: a. Determine the initial water permeability coefficient of the specimen; b. Load the specimen with a plugging agent; c. Repeat the test specimen with a tire with a certain load while spraying water on it to simulate the effect of vehicle load on the pavement on rainy days; d. Determine the water permeability coefficient after the test is completed. Repeat b, c, d until the water permeability coefficient is less than 120mL / min, and evaluate the anti-clogging ability by the number of cycles. The experimental results are shown in Table 4.

[0048] Table 1 PERS-13

[0049]

[0050] Table 2 PAC-13

[0051]

[0052] Table 3 PAC-16

[0053]

[0054] Table 4 Anti-blocking performance test

[0055]

[0056]

[0057] It can be seen from the table that the anti-blocking ability of the double-layer drainage pavement structure of the present invention is much greater than that of conventional double-layer drainage pavements and single-layer drainage pavements. This is because the elastic modulus of the super-elastic porous mixture is only 1 / 10 of that of conventional asphalt mixtures. Under the load of vehicle tires on rainy days, dynamic water pressure will appear inside the double-layer drainage asphalt pavement of the present invention, which will then produce a "siphon" effect, bringing out the dust inside the blocked pores, and has a self-cleaning function. Compared with conventional drainage pavements, the drainage capacity is more durable and can effectively maintain the safety of vehicle driving on rainy days.

[0058] 2. The following is a comparison of the anti-wear and anti-rutting performance of the super-elastic porous mixture PERS-13 and the commonly used porous asphalt mixture PAC-13:

[0059] The mixture gradation is the same as Table 1 and Table 2. The anti-wear performance of the super elastic porous mixture PERS-13 and the common porous asphalt mixture PAC-13 was tested by the mixture dispersion instrument. The load applied was 2000N, the tire pressure was set at 200kpa, the speed was set at 40km / h, and the total running time was 8h. The specimens were taken out after 4h and 8h of the test, and the structural depth and pendulum value before and after wear were tested by the sand spreading method and the pendulum friction instrument. The test results Figure 2 and Figure 3 .

[0060] Depend on Figure 2and Figure 3 It is known that with the increase of wear time, the pavement structure depth and swing value gradually decrease, and the anti-skid performance decreases to varying degrees. At different stages, the structure depth and swing value of PERS-13 are greater than those of PAC-13, indicating that the anti-skid performance of PERS-13 is better than that of PAC-13. After wear, the anti-skid performance of PERS-13 decreases slightly, but the decrease of PAC-13 is larger, and the difference between the two gradually increases, which fully demonstrates that the patent uses PERS-13 as the upper layer of the drainage pavement, which has better anti-skid ability and wear resistance than the traditional drainage asphalt pavement, and can effectively maintain the safety of vehicle driving in rainy days.

[0061] The dynamic stability of the two mixtures was tested by a 60°C rutting test. The test results are shown in Table 4. The dynamic stability of PERS-13 is much better than that of PAC-13, indicating that the use of super-elastic porous mixture as the upper layer can significantly improve the rutting resistance of the pavement structure and improve the stability of the pavement under high temperature and heavy load conditions.

[0062] 3. Let’s compare the rutting resistance of the lower layer of a self-cleaning durable drainage pavement structure with that of an ordinary pavement. A self-cleaning durable drainage pavement structure uses a high modulus mixture HMAC-20, and the low-grade asphalt uses 30# base asphalt, with an oil-stone ratio of 4.5; the lower layer of the ordinary drainage asphalt pavement uses AC-20, and the asphalt uses 70# base asphalt, with an oil-stone ratio of 4.5. The gradations of the two are the same, see Table 5 for the gradation, and the experimental data are shown in Table 6.

[0063] Table 5 The lower layer gradation

[0064]

[0065] Table 6 High temperature rutting test data

[0066]

[0067] The mechanical properties and high temperature performance of the high modulus mixture HMAC-20 are much greater than those of the ordinary asphalt mixture AC-20. The high modulus mixture can improve the heavy load resistance of the drainage pavement, enhance the overall shear resistance of the pavement, and extend the durability of the drainage pavement.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A self-cleaning durable drainage pavement structure, characterized in that: The invention comprises a pavement unit and a drainage unit, wherein the pavement unit comprises an upper layer (1), an adhesive layer (2), a middle layer (3), a waterproof adhesive layer (4), a lower layer (5), a stress absorbing layer (6) and a base layer (7) arranged in order from top to bottom; the upper layer (1) adopts a super-elastic porous mixture, the porosity of the super-elastic porous mixture is 18-22%, the super-elastic porous mixture comprises graded stone, rubber particles and high-viscosity and high-elastic composite modified asphalt, or the super-elastic porous mixture comprises graded stone, rubber particles and high-viscosity and high-elastic composite modified asphalt. The invention relates to a composite material comprising graded stone, rubber particles and polyurethane; the addition amount of polyurethane and high-viscosity and high-elastic composite modified asphalt is 4-6% of the addition amount of graded stone respectively; the polyurethane uses a slow-reacting single-component polyurethane adhesive; the addition amount of rubber particles is 6%-12% of the addition amount of graded stone; the adhesive layer (2) uses polyurethane modified emulsified asphalt; the middle surface layer (3) uses porous asphalt mixture; the porosity of the porous asphalt mixture is 20%-25%; the porous asphalt mixture includes graded stone, High-viscosity and high-elasticity composite modified asphalt and basalt fiber, the addition amount of the high-viscosity and high-elasticity composite modified asphalt is 3%-5% of the addition amount of graded stone, and the addition amount of basalt fiber is 0.1%-0.5% of the addition amount of graded stone; the waterproof bonding layer (4) adopts hot-sprayed modified asphalt, and the lower layer (5) adopts high-modulus asphalt mixture, the dynamic modulus of the high-modulus asphalt mixture at 15°C is not less than 14000MPa, and the high-modulus asphalt mixture includes graded stone and low-grade asphalt. The amount of low-grade asphalt added is 3%-5% of the amount of graded stone added; the stress absorption layer (6) uses rubber asphalt mortar, and the base layer (7) uses cement-stabilized crushed stone; the height of the drainage unit is lower than the height of the waterproof bonding layer (4), and the drainage unit includes a drainage ditch, a cover plate (9) and a filter screen (10); the cover plate (9) is arranged at the water inlet position of the drainage ditch, and the cover plate (9) is provided with a drainage hole; the filter screen (10) is arranged on the cover plate (9).

2. A self-cleaning durable drainage pavement structure according to claim 1, characterized in that: The thickness of the upper layer (1) is 25-40 mm, and the amount of the adhesive layer (2) is 0.3-0.6 L / m 2 The thickness of the middle surface layer (3) is 40-60 mm, and the amount of the waterproof adhesive layer (4) is 1.5-1.8 L / m 2 , the thickness of the lower layer (5) is 50-70mm.

3. The self-cleaning durable drainage pavement structure according to claim 1, characterized in that: The amount of polyurethane added in the polyurethane modified emulsified asphalt is 5:95, and the polyurethane is a slow-reacting single-component polyurethane adhesive.

4. The self-cleaning durable drainage pavement structure according to claim 1, characterized in that: The preparation method of the rubber asphalt mortar is as follows: firstly spread the rubber asphalt in an amount of 2-3 kg / m 2 , and then spread the gravel while it is still hot. The maximum particle size of the gravel is 9.5mm, and the proportion of gravel with a particle size of 9.5mm is greater than 85%. The spreading amount is 17-20kg / m 2 .

5. The self-cleaning durable drainage pavement structure according to claim 1, characterized in that: The high-viscosity and high-elasticity composite modified asphalt includes a high viscosity agent and an SBS modified asphalt, and the added amount of the high viscosity agent: the added amount of the SBS modified asphalt = 10:

90.

6. The self-cleaning durable drainage pavement structure according to claim 1, characterized in that: The drainage ditch is a mortar-laid flagstone rectangular drainage ditch, the depth and width of which are both 0.4-0.6 m; the cover plate (9) is a reinforced concrete cover plate (9) with drainage holes; the filter screen (10) is a stainless steel filter screen (10), the wire diameter of the filter screen (10) is 0.12-0.19 mm, and the pore diameter is 0.38-1.08 mm.

7. A method for laying a self-cleaning durable drainage pavement structure, used for laying the self-cleaning durable drainage pavement structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: Building a base layer (7), and after the building is completed, spreading a stress absorbing layer (6) on the base layer (7); Laying the lower layer (5) on the stress absorbing layer (6), and after the paving is completed, spreading the waterproof adhesive layer (4) on the lower layer (5); Laying a middle surface layer (3) and an upper surface layer (1) on the waterproof adhesive layer (4), and bonding the middle surface layer (3) and the upper surface layer (1) with an adhesive layer (2); A drainage unit is constructed, wherein the height of the drainage unit is lower than the height of the waterproof bonding layer (4).

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