A new combined steel bridge deck pavement structure

Abstract

The utility model discloses a novel combined steel bridge deck pavement structure relates to highway engineering technical field, including steel bridge deck, epoxy macadam asphalt connecting layer, dense asphalt mixture structural layer, dense polyurethane mixture structural layer, keep wearing layer and waterproof adhesive layer. Dense asphalt mixture structural layer is laid in the position of the upper side of epoxy macadam asphalt connecting layer, dense polyurethane mixture structural layer is laid in the position of the upper side of dense asphalt mixture structural layer, keep wearing layer is set in the position of the upper side of dense polyurethane mixture structural layer, waterproof adhesive layer is set between dense asphalt mixture structural layer and dense polyurethane mixture structural layer and between dense polyurethane mixture structural layer and keep wearing layer, and the overall strength and waterproof capacity of steel bridge deck pavement can be promoted through the structure of each layer.

Description

Technical Field

[0001] This utility model relates to the field of highway engineering technology, and in particular to a novel composite steel bridge deck pavement structure. Background Technology

[0002] As a crucial component of bridge structures, steel bridge deck pavement directly withstands the repeated effects of vehicle loads and the erosion caused by environmental factors (such as temperature changes, precipitation, and ultraviolet radiation). Its performance not only impacts driving safety and comfort but also significantly affects the bridge's service life and operating costs. With the rapid development of transportation infrastructure in my country, the scale of long-span steel bridge construction is continuously expanding, leading to increasingly stringent technical requirements for steel bridge deck pavement.

[0003] However, traditional steel bridge deck pavement structures have revealed many problems in practical applications. Although early asphalt-based pavement materials have good flexibility and ease of construction, they are prone to rutting, shoving, and bulging under heavy traffic and high-temperature environments. Furthermore, they lack low-temperature crack resistance and cannot adapt to the deformation characteristics of steel bridge decks. While cement concrete pavement has high strength, its excessive rigidity results in poor coordination with the deformation of steel bridge decks, making it prone to reflective cracking and causing premature damage to the pavement layer.

[0004] To address these issues, the industry has successively developed various improved pavement structures, such as epoxy asphalt pavement and cast-in-place asphalt pavement. Epoxy asphalt pavement, with its high strength, high adhesion, and good fatigue resistance, has been used in some bridges, but it suffers from drawbacks such as high material costs, complex construction processes, and significant low-temperature brittleness. Cast-in-place asphalt pavement offers good fluidity and sealing, but its high-temperature stability is insufficient, making it prone to softening under sustained high temperatures, and its maintenance is also quite difficult.

[0005] Meanwhile, the bonding performance between the steel bridge deck pavement and the steel bridge panel is crucial to ensuring the overall structural integrity. Traditional bonding layer materials are prone to interfacial delamination under long-term loads and environmental conditions, leading to a decline in the collaborative working ability between the pavement layer and the steel bridge panel, and consequently causing serious defects such as cracking and detachment of the pavement layer. Furthermore, the waterproofing performance of existing pavement structures needs improvement; moisture infiltration not only exacerbates internal damage to the pavement layer but also corrodes the steel bridge panel, affecting the safety of the bridge structure.

[0006] With the continuous growth of traffic flow and the increasing vehicle load, existing steel bridge deck pavement structures can no longer meet the needs of modern transportation development in terms of durability, stability, and economy. Therefore, developing a new type of steel bridge deck pavement structure that combines good mechanical properties, deformation coordination, waterproof adhesion, and durability, as well as convenient construction and reasonable cost, has become an important issue that urgently needs to be addressed in the field of bridge engineering. Utility Model Content

[0007] This utility model provides a novel composite steel bridge deck pavement structure, comprising:

[0008] A steel bridge deck, on which an epoxy crushed stone asphalt bonding layer is laid, the epoxy crushed stone asphalt bonding layer being connected to the steel bridge deck;

[0009] A dense asphalt mixture structural layer is laid above the epoxy crushed stone asphalt bonding layer;

[0010] A dense polyurethane mixture structural layer is laid on top of the dense asphalt mixture structural layer;

[0011] A wear-resistant layer is disposed above the dense polyurethane compound structural layer;

[0012] A waterproof adhesive layer is disposed between the dense asphalt mixture structural layer and the dense polyurethane mixture structural layer, and between the dense polyurethane mixture structural layer and the wear-resistant layer.

[0013] Preferably, in this embodiment of the application, the epoxy crushed stone asphalt bonding layer includes:

[0014] An epoxy resin layer is disposed above the steel bridge deck.

[0015] A polyurethane resin bitumen layer is disposed above the epoxy resin layer;

[0016] An epoxy asphalt layer is disposed above the polyurethane resin asphalt layer, and the dense asphalt mixture structural layer is disposed above the epoxy asphalt layer.

[0017] Preferably, in this embodiment of the application, a type I crushed stone layer is provided between the epoxy resin layer and the polyurethane resin asphalt layer;

[0018] A type II crushed stone layer is provided between the polyurethane resin asphalt layer and the epoxy asphalt layer.

[0019] Preferably, in this embodiment of the application, the thickness of the Type I crushed stone layer is maintained at 3mm to 5mm; and the thickness of the Type II crushed stone layer is maintained at 5mm to 8mm.

[0020] Preferably, in this embodiment of the application, a high tensile strength fiber strip is laid between the Type I crushed stone layer and the Type II crushed stone layer, and the polyurethane resin asphalt layer is sprayed on the surface of the Type I crushed stone layer and the high tensile strength fiber strip.

[0021] The high tensile strength fiber tape includes one of polyester fiberglass tape, polypropylene fiber tape, and basalt fiber tape.

[0022] Preferably, in this embodiment of the application, the width of the high tensile strength fiber strip is 60mm to 120mm, the length is the same as the size of the steel bridge deck pavement, and the high tensile strength fiber strip is evenly distributed along the bridge deck with a transverse spacing of 300mm to 500mm and a longitudinal spacing of 500mm to 1000mm.

[0023] Preferably, in this embodiment of the application, the waterproof adhesive layer comprises:

[0024] A Type I waterproof adhesive layer is disposed between the dense asphalt mixture structural layer and the dense polyurethane mixture structural layer;

[0025] A type II waterproof adhesive layer is disposed between the dense polyurethane mixture structural layer and the wear-resistant layer.

[0026] Preferably, in this embodiment of the application, the Type I waterproof adhesive layer is epoxy asphalt, which is composed of toughened epoxy resin adhesive and asphalt;

[0027] The Type II waterproof adhesive layer is a water-based polyurethane modified emulsified asphalt, which is composed of asphalt, water-based polyurethane emulsion, and emulsifier.

[0028] Preferably, in this embodiment of the application, the thickness of the dense polyurethane mixture structural layer is 20mm to 25mm;

[0029] The thickness of the dense asphalt mixture structural layer is 20mm to 25mm.

[0030] Preferably, in this embodiment of the application, the thickness of the wear-resistant layer is 15mm to 20mm.

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] The epoxy-coated crushed stone asphalt bonding layer, through its gradient design consisting of an epoxy resin layer, a Type I crushed stone layer, a polyurethane resin asphalt layer, a Type II crushed stone layer, and an epoxy asphalt layer, significantly improves the bond strength with the steel bridge deck. The inclusion of high-tensile-strength fiber strips further enhances the shear resistance within the bonding layer, reducing interlayer slippage and absorbing tensile stress. Simultaneously, the waterproof bonding layers (Type I epoxy asphalt and Type II waterborne polyurethane-modified emulsified asphalt) between the dense asphalt mixture and the polyurethane mixture, and between the polyurethane mixture and the wear-resistant layer, not only achieve a tight bond between the layers but also ensure synergistic operation between different functional layers through targeted material selection (such as the high adhesion of epoxy asphalt and the flexibility of waterborne polyurethane-modified emulsified asphalt), effectively preventing the risks of interface delamination and water seepage. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the overall structure of a novel combined steel bridge deck pavement structure provided by this utility model;

[0035] Figure 2 A schematic diagram of the overall structure of the epoxy crushed stone asphalt bonding layer provided by this utility model;

[0036] Figure 3 A top-view structural diagram of the Type I crushed stone layer provided by this utility model;

[0037] Figure 4 A construction flowchart for a novel combined steel bridge deck pavement structure provided by this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Steel bridge deck; 200. Epoxy crushed stone asphalt bonding layer; 210. Epoxy resin layer; 220. Polyurethane resin asphalt layer; 230. Epoxy asphalt layer; 240. Type I crushed stone layer; 250. Type II crushed stone layer; 260. High tensile strength fiber strip; 300. Dense asphalt mixture structural layer; 400. Dense polyurethane mixture structural layer; 500. Wear-resistant layer; 600. Waterproof bonding layer; 610. Type I waterproof bonding layer; 620. Type II waterproof bonding layer. Detailed Implementation

[0040] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0041] like Figures 1 to 4As shown in the figure, this utility model provides a novel composite steel bridge deck pavement structure, including a steel bridge deck 100 and various layers laid on top of the steel bridge deck 100. The first layer on the steel bridge deck 100 is an epoxy-coated crushed stone asphalt bonding layer 200, which mainly consists of an epoxy resin layer 210, a type I crushed stone layer 240, a polyurethane resin asphalt layer 220, a type II crushed stone layer 250, and an epoxy asphalt layer 230. These five layers are laid sequentially from bottom to top, forming a bonding layer that is tightly connected to the steel bridge deck 100 and possesses excellent adhesion and durability. The epoxy resin layer 210, as the bottom layer, is laid directly on top of the steel bridge deck 100, and its high strength and good adhesion provide a solid foundation for the entire pavement structure.

[0042] A Type I crushed stone layer 240 is laid on top of the epoxy resin layer 210, and a polyurethane resin asphalt layer 220 is placed on top of the Type I crushed stone layer 240, further enhancing the flexibility and weather resistance of the bonding layer. The epoxy asphalt layer 230 serves as the top layer of the bonding layer, positioned above the Type II crushed stone layer 250. It not only bonds tightly with the Type II crushed stone layer 250 and the polyurethane resin asphalt layer 220 below, but also provides stable support for the dense asphalt mixture structural layer 300 above.

[0043] The epoxy resin layer 210 is composed of a toughened epoxy resin adhesive, which can be applied and cured at room temperature. The toughened epoxy resin adhesive consists of component A and component B in a ratio of 1.2:1. Component A comprises: 100 parts bisphenol A epoxy resin, 10-15 parts reactive diluent, 25-35 parts toughening agent, 20-30 parts silica powder, and 5-8 parts fumed silica. CTBN nitrile rubber, DTDM vulcanizing agent, RD antioxidant, and N774 carbon black are used as toughening agents to ensure that the epoxy resin possesses excellent mechanical strength, toughness, and high-temperature stability. Component B comprises: 40-50 parts polyetheramine or modified amine curing agent, 3-5 parts DMP-30 accelerator, 5-10 parts diluent, and 0.5-1 part silicone defoamer. The three-dimensional network structure formed after the toughened epoxy resin adhesive cures forms a good bond with the steel bridge deck 100 and the pavement layer, exhibiting good flexibility and fatigue resistance. The application rate is 1.2–1.5 kg / m². 2 .

[0044] The polyurethane resin asphalt layer 220 is composed of 25%–35% asphalt, 20%–30% polyurethane resin, 20%–30% chloroprene latex, 10%–15% liquid polysiloxane resin, and 8%–10% zirconium silicate powder, among other materials. It exhibits excellent adhesion, waterproofing, high-temperature stability, and fatigue resistance. The polyurethane resin asphalt application rate is 2.5–3.0 kg / m³. 2 .

[0045] The epoxy asphalt layer 230 is composed of toughened epoxy resin binder and asphalt in a certain proportion. The asphalt has a dynamic viscosity ≥ 500,000 Pa·s at 60℃ and a softening point ≥ 92℃. The epoxy asphalt application rate is 4.5–5.5 kg / m³. 2 Epoxy bitumen layer 230 has excellent waterproof, adhesive and high-temperature stability properties.

[0046] Above the epoxy-coated crushed stone asphalt bonding layer 200, a dense asphalt mixture structural layer 300 and a dense polyurethane mixture structural layer 400 are laid sequentially, with the dense polyurethane mixture structural layer 400 positioned above the dense asphalt mixture structural layer 300. Both layers employ a dense mixture design to ensure the pavement structure possesses sufficient impermeability, strength, and stability to withstand repeated vehicle loads. Simultaneously, the dense polyurethane mixture structural layer 400 also exhibits excellent elasticity and fatigue resistance, further enhancing the durability and comfort of the pavement structure.

[0047] The dense asphalt mixture structural layer 300 is composed of ultra-high viscosity modified asphalt, 0-3mm fine aggregate, 3-5mm, 5-10mm, and 10-15mm coarse aggregate, and mineral powder in a specific gradation. The asphalt-aggregate ratio is 6.0%-6.5%, the porosity is <2.7%, and 3‰-6‰ basalt short-cut fibers are incorporated to improve its crack resistance. The ultra-high viscosity modified asphalt has a dynamic stability of over 6000 cycles / mm at 70℃. The thickness of the dense asphalt mixture structural layer 300 is 20-25mm.

[0048] The dense polyurethane mixture structural layer 400 is composed of polyurethane binder, 0-3mm fine aggregate, 3-5mm, 5-10mm and mineral powder in a certain gradation, with a binder-to-aggregate ratio of 12%-18% and almost zero porosity, effectively reducing water vapor diffusion. The thickness of the dense polyurethane mixture structural layer 400 is 20-25mm.

[0049] Above the dense polyurethane compound structural layer 400, a wear-resistant layer 500 is also installed. As the outermost layer of the pavement structure, the wear-resistant layer 500 directly bears the wear of vehicles and environmental erosion. Therefore, the wear-resistant layer 500 is made of high-quality wear-resistant and anti-slip materials to ensure that the pavement structure has good anti-slip and wear resistance, thereby improving driving safety and comfort.

[0050] The Baoku Wear Layer 500 is composed of ultra-high viscosity modified asphalt, 0-3mm fine aggregate, 3-5mm and 5-10mm coarse aggregate, and mineral powder in a specific gradation. The asphalt-aggregate ratio is 5.5%-5.8%, the porosity is 12%-18%, and 2‰-3‰ lignocellulose is incorporated to improve its Marshall stability and dynamic stability in the 60℃ rutting test, while reducing runoff loss. The Baoku Wear Layer 500 features drainage, anti-skid properties, noise reduction, and durability, providing long-term driving safety and comfort. Its thickness is 15-20mm.

[0051] Furthermore, this invention also provides waterproof adhesive layers 600 between the dense asphalt mixture structural layer 300 and the dense polyurethane mixture structural layer 400, and between the dense polyurethane mixture structural layer 400 and the wear-resistant layer 500. The waterproof adhesive layer 600 mainly consists of a Type I waterproof adhesive layer 610 and a Type II waterproof adhesive layer 620. The Type I waterproof adhesive layer 610 is disposed between the dense asphalt mixture structural layer 300 and the dense polyurethane mixture structural layer 400; the Type II waterproof adhesive layer 620 is disposed between the dense polyurethane mixture structural layer 400 and the wear-resistant layer 500. Specifically, the Type I waterproof adhesive layer 610 uses epoxy asphalt, composed of toughened epoxy resin binder and asphalt, with a spraying rate of 1.5–2.5 kg / m³ regardless of thickness. 2 Type II waterproof adhesive layer 620 uses water-based polyurethane modified emulsified asphalt, composed of asphalt, water-based polyurethane emulsion, and emulsifier. Regardless of thickness, the application rate is 1.0–2.0 kg / m². 2 The 600 waterproof adhesive layer not only effectively prevents moisture from seeping into the pavement structure and causing damage, but also enhances the bonding performance between the various layers, ensuring the integrity and stability of the pavement structure.

[0052] In the above, the thickness of the dense polyurethane mixture structural layer 400 is 20mm to 25mm; the thickness of the dense asphalt mixture structural layer 300 is 20mm to 25mm; and the thickness of the protective wear layer 500 set above the type II waterproof adhesive layer 620 is 15mm to 20mm.

[0053] In this embodiment of the application, a crushed stone layer is also provided, which includes a type I crushed stone layer 240 and a type II crushed stone layer 250. The type I crushed stone layer 240 is disposed between the epoxy resin layer 210 and the polyurethane resin asphalt layer 220; the type II crushed stone layer 250 is disposed between the polyurethane resin asphalt layer 220 and the epoxy asphalt layer 230.

[0054] In this embodiment, the Type I crushed stone layer 240 consists of two grades of hard crushed stone, such as diabase or basalt, with a thickness of 0-3mm and 3-5mm, and a spreading rate of 5.5-8.0 kg / m³. 2The 0-3mm and 3-5mm grade crushed stone exhibits superior fatigue resistance compared to the traditional single-grade crushed stone. The Type II crushed stone layer 250, composed of 5-8mm hard crushed stone such as diabase or basalt, possesses greater roughness, allowing for better interlocking and bonding with the epoxy asphalt layer 230 and the asphalt mixture structural layer 300. This effectively avoids or significantly mitigates interlayer shear slippage. The crushed stone application rate is 3.0-4.0 kg / m². 2 .

[0055] In this embodiment, a high tensile strength fiber strip 260 is also provided. The high tensile strength fiber strips 260 are arranged in a triangular pattern, and multiple high tensile strength fiber strips 260 are disposed between the type I crushed stone layer 240 and the type II crushed stone layer 250, specifically:

[0056] Multiple high tensile strength fiber strips 260 are disposed between the type I crushed stone layer 240 and the type II crushed stone layer 250, and all the high tensile strength fiber strips 260 pass through the interior of the polyurethane resin asphalt layer 220.

[0057] Multiple high tensile strength fiber tapes 260 include one of polyester fiberglass tape, polypropylene fiber tape, and basalt fiber tape.

[0058] In this embodiment, the high tensile strength fiber strip 260 has a strip-like structure and is evenly distributed along the bridge deck with a transverse spacing of 300mm to 500mm and a longitudinal spacing of 500mm to 1000mm.

[0059] Based on the above structure, the construction method of the novel composite steel bridge deck pavement structure in this embodiment is as follows:

[0060] Step S1: Shot blasting process for steel bridge deck. The steel bridge deck 100 is shot blasted to Sa2.5 grade using a dedicated shot blasting machine, achieving a roughness of 80-120μm, and dust and impurities on the steel plate surface are cleaned.

[0061] Step S2: Construction of the 200mm epoxy crushed stone asphalt bonding layer;

[0062] S21: Apply toughening epoxy resin adhesive to the shot-blasted steel plate at a rate of 1.2–1.5 kg / m². 2 ;

[0063] S22: No waiting is required. Next, use a self-propelled stone spreader to spread basalt gravel in two grades: 0-3mm and 3-5mm. The amount of 3-5mm gravel is 7.5-8.0 kg / m², and the amount of 0-3mm gravel is 3.0-4.0 kg / m². After curing for no less than 6 hours, sweep up the loose gravel and use a vacuum cleaner to remove the unbonded gravel to form a Type I gravel layer.

[0064] S23: Lay a high tensile strength fiber strip 260 above the Type I crushed stone layer;

[0065] S24: A polyurethane resin asphalt layer 220 is applied using an asphalt distributor, laid on top of a Type I crushed stone layer 240, and then filled with high-tensile-strength fiber tape 260. The polyurethane resin asphalt application rate is 2.5–3.0 kg / m³. 2 ;

[0066] S25: A Type II crushed stone layer of 250mm is formed by spreading 5-8mm basalt crushed stone using a self-propelled crushing stone spreader, with a crushed stone spreading rate of 3.0-4.0 kg / m³. 2 ;

[0067] S26: Epoxy asphalt is applied using an asphalt distributor truck at a rate of 4.5–5.5 kg / m³. 2 ;

[0068] Step S3: Laying of the 300mm dense asphalt mixture structural layer. The 300mm dense asphalt mixture structural layer is laid using an asphalt paver, with the paving temperature controlled at approximately 175℃. A combination roller is then used for initial and final compaction.

[0069] Step S4: Application of Type I waterproof adhesive layer 600. Apply using an asphalt distributor, at a rate of 1.5–2.5 kg / m². 2 ;

[0070] Step S5: Two hours after the completion of the Type I waterproof adhesive layer 600, proceed with the construction of the dense polyurethane mixture structural layer 400. Use a non-rolling mechanical paving device with leveling, spreading, vibration, and smoothing functions to pave at room temperature. No roller compaction is required.

[0071] Step S6: Three hours after the dense polyurethane mixture structural layer 400 is completed, roughen the surface.

[0072] Step S7: Simultaneously apply the Type II waterproof adhesive layer 620 and the wear-resistant layer 500. Use a synchronous paver to pave the Type II waterproof adhesive layer 620 and the wear-resistant layer 500 in one piece. Control the paving temperature of the wear-resistant layer 500 at approximately 175℃, and control the spraying temperature of the water-based polyurethane modified emulsified asphalt at approximately 70℃, with a spraying rate of 1.0–2.0 kg / m³. 2 Waterborne polyurethane-modified emulsified asphalt rapidly demulsifies upon contact with the hot protective wear course 500 asphalt mixture, forming a Type II waterproof bonding layer 620. A combined roller is used to perform initial and final compaction of the protective wear course 500. Traffic is opened after the road surface temperature drops to 50°C.

[0073] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A novel composite steel bridge deck pavement structure, characterized in that, include: A steel bridge deck, on which an epoxy crushed stone asphalt bonding layer is laid, the epoxy crushed stone asphalt bonding layer being connected to the steel bridge deck; A dense asphalt mixture structural layer is laid above the epoxy crushed stone asphalt bonding layer; A dense polyurethane mixture structural layer is laid on top of the dense asphalt mixture structural layer; A wear-resistant layer is disposed above the dense polyurethane compound structural layer; A waterproof adhesive layer is disposed between the dense asphalt mixture structural layer and the dense polyurethane mixture structural layer, and between the dense polyurethane mixture structural layer and the wear-resistant layer.

2. The novel composite steel bridge deck pavement structure according to claim 1, characterized in that, The epoxy crushed stone asphalt bonding layer includes: An epoxy resin layer is disposed above the steel bridge deck. A polyurethane resin bitumen layer is disposed above the epoxy resin layer; An epoxy asphalt layer is disposed above the polyurethane resin asphalt layer, and the dense asphalt mixture structural layer is disposed above the epoxy asphalt layer.

3. The novel composite steel bridge deck pavement structure according to claim 2, characterized in that, A type I crushed stone layer is provided between the epoxy resin layer and the polyurethane resin asphalt layer. A type II crushed stone layer is provided between the polyurethane resin asphalt layer and the epoxy asphalt layer.

4. The novel composite steel bridge deck pavement structure according to claim 3, characterized in that, The thickness of the Type I crushed stone layer is maintained at 3mm to 5mm; the thickness of the Type II crushed stone layer is maintained at 5mm to 8mm.

5. A novel composite steel bridge deck pavement structure according to claim 4, characterized in that, A high tensile strength fiber strip is laid between the Type I crushed stone layer and the Type II crushed stone layer, and the polyurethane resin asphalt layer is sprayed on the surface of the Type I crushed stone layer and the high tensile strength fiber strip. The high tensile strength fiber tape includes one of polyester fiberglass tape, polypropylene fiber tape, and basalt fiber tape.

6. A novel composite steel bridge deck pavement structure according to claim 5, characterized in that, The high tensile strength fiber strip has a width of 60mm to 120mm and a length equal to the size of the steel bridge deck pavement. The high tensile strength fiber strip is evenly distributed along the bridge deck with a transverse spacing of 300mm to 500mm and a longitudinal spacing of 500mm to 1000mm.

7. A novel composite steel bridge deck pavement structure according to claim 1, characterized in that, The waterproof adhesive layer includes: A Type I waterproof adhesive layer is disposed between the dense asphalt mixture structural layer and the dense polyurethane mixture structural layer; A type II waterproof adhesive layer is disposed between the dense polyurethane mixture structural layer and the wear-resistant layer.

8. A novel composite steel bridge deck pavement structure according to claim 7, characterized in that, The Type I waterproof adhesive layer is epoxy asphalt, which is composed of toughened epoxy resin adhesive and asphalt. The Type II waterproof adhesive layer is a water-based polyurethane modified emulsified asphalt, which is composed of asphalt, water-based polyurethane emulsion, and emulsifier.

9. A novel composite steel bridge deck pavement structure according to claim 1, characterized in that, The thickness of the dense polyurethane compound structural layer is 20mm to 25mm; The thickness of the dense asphalt mixture structural layer is 20mm to 25mm.

10. A novel composite steel bridge deck pavement structure according to claim 1, characterized in that, The thickness of the wear-resistant layer is 15mm to 20mm.

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