A road pavement structure and its paving method

Abstract

This invention relates to a pavement structure and its installation method. The pavement structure includes a main body, which comprises a base layer, a concrete layer, and a first bonding layer. The first bonding layer is disposed between the base layer and the concrete layer to bond the base layer and the concrete layer. A storage tank is fixedly disposed on the side of the main body. The storage tank is used to store an aqueous solution of light stabilizer, and the top of the storage tank is provided with a feeding port, in which a plug is detachably installed. The main body also includes a hydrophilic polymer fiber mesh, which is laid on the concrete layer and extends into the storage tank from the side. The polymer fiber mesh can adsorb and disperse the aqueous solution of light stabilizer on it. The surface tension of the fibers promotes the flow of liquid, and the aqueous solution of light stabilizer in the storage tank is uniformly absorbed and dispersed throughout the pavement structure, extending the UV resistance of the pavement structure and ensuring the full service life performance of the concrete.

Description

Technical Field

[0001] This invention relates to the field of road, stadium or similar engineering construction or paving technology, specifically to a road paving structure and paving method. Background Technology

[0002] In the construction or paving of roads, stadiums, or similar projects, the durability design of pavement structures is one of the key challenges. Currently, mainstream pavement materials include epoxy asphalt concrete, cast-in-place asphalt concrete, asphalt mastic aggregate concrete, and UHPC ultra-high performance concrete, each with different characteristics and significant drawbacks during use. Epoxy asphalt concrete has excellent overall performance, but it is expensive, has poor low-temperature crack resistance, weak ability to coordinate deformation with the road base, and is prone to delamination. Cast-in-place asphalt concrete has poor high-temperature stability and skid resistance, making it prone to rutting and shoving. Asphalt mastic aggregate concrete has coarse aggregate particle size, poor adhesion to the road base, and is prone to peeling and delamination, making it unsuitable for use as a sub-layer. UHPC ultra-high performance concrete has a complex construction process, is prone to construction defects, and is difficult to maintain later.

[0003] Polyurethane concrete possesses advantages such as high strength, strong adhesion, impermeability, crack resistance, and ease of construction, effectively addressing the shortcomings of mainstream paving materials. However, like asphalt, polyurethane materials undergo aging and degradation under ultraviolet (UV) radiation, leading to discoloration, brittleness, and reduced mechanical properties, making it difficult to meet the 15-year design service life requirement. In high-altitude regions of my country, such as Yunnan, Tibet, and Qinghai, the thin atmosphere reduces UV filtration, causing rapid asphalt aging and polymer modifier degradation. Sunlight significantly impacts the performance of pavement materials, compromising the durability of polyurethane concrete in these areas. UV absorbers (UVA) absorb harmful UV radiation and disperse it as harmless heat, exhibiting high light resistance and effectively preventing and delaying UV degradation. Hindered amine light stabilizers (HALS), a type of amine compound, possess excellent photodegradation inhibition due to their steric hindrance. By capturing free radicals generated during substrate degradation, they effectively delay fading and yellowing of outdoor materials. Adding light stabilizers such as UV absorbers (UVA) and hindered amine light stabilizers (HALS) to polyurethane concrete helps improve its resistance to UV aging. However, these light stabilizers are highly dependent on chemical stability and can undergo structural damage and depletion under long-term UV exposure, leading to functional degradation or failure. To ensure the 15-year design service life of polyurethane concrete pavement structures, it is crucial to improve the long-term effectiveness of polyurethane concrete's UV resistance.

[0004] To address the aforementioned issues, Chinese invention patent application CN202210132290.X (publication number CN114277636A) discloses "A Road Pavement Structure and Its Manufacturing Method," which employs the method of adding a light stabilizer to resin concrete to improve its UV resistance. The light stabilizer is added primarily through two methods: mixing and surface application. After ten years, the flexural strength of the resin concrete with the added light stabilizer is approximately 80% of its pre-aging strength, indicating good overall UV resistance. However, data on its anti-aging performance after the design life of 15 years is lacking, suggesting room for improvement.

[0005] For example, Chinese invention patent application CN201911277303.7 (publication number CN112961308A) discloses a method for preparing titanium dioxide nanoparticle-doped polymeric polyurethane materials. However, because titanium dioxide is directly incorporated into polyurethane, its dispersion within the polyurethane is poor. While this method can improve the UV aging resistance of polyurethane materials, the aggregation of titanium dioxide particles during the polyurethane curing process can affect the mechanical properties of the polyurethane material itself.

[0006] In summary, existing UV-resistant technologies for polyurethane materials suffer from several problems: the light stabilizer is depleted under UV radiation, resulting in poor UV resistance durability; the light stabilizer is not uniformly distributed in the polyurethane material, affecting the mechanical properties of the polyurethane material itself; and the production process is complex, costly, and difficult to apply on a large scale. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a road paving structure with strong and durable resistance to ultraviolet aging, in light of the current state of the prior art.

[0008] The second technical problem to be solved by the present invention is to provide a paving method that applies the above-mentioned road paving structure, in view of the current state of the prior art.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a road pavement structure, including a main body, the main body including a base layer, a concrete layer and a first bonding layer, the first bonding layer being disposed between the base layer and the concrete layer for bonding the base layer and the concrete layer, characterized in that a storage tank is fixedly provided on the side of the main body, the storage tank being used to store an aqueous solution of light stabilizer, and the top of the storage tank being provided with a feeding port, the feeding port being detachably installed with a plug;

[0010] The main body also includes a hydrophilic polymer fiber mesh, which is laid on the concrete layer and extends into the storage tank from the side. The polymer fiber mesh can adsorb and disperse the light stabilizer aqueous solution on it.

[0011] Preferably, the storage tank is equipped with a water-absorbing element, in which the light stabilizer aqueous solution is adsorbed. This prevents the light stabilizer from settling in the water.

[0012] Preferably, the ends of the polymer fiber web are filled into the storage tank to form the absorbent element. This not only simplifies the structure, eliminating the need for an additional absorbent element, but also avoids concerns that the absorbent element might have excessive adsorption force on the light stabilizer aqueous solution, preventing the polymer fiber web from adsorbing the light stabilizer aqueous solution.

[0013] Preferably, the mesh density of the polymer fiber web is 100-400 g / m². 2 The spacing between the light stabilizer aqueous solution and the polymer fiber web ensures uniform dispersion of the light stabilizer solution on the polymer fiber web. This not only prevents the light stabilizer from agglomerating and affecting the mechanical properties of the main body, but also gives all parts of the main body resistance to ultraviolet aging. At the same time, the mesh density of the polymer fiber web also ensures its tensile strength, thereby improving the tensile strength of the main body.

[0014] Preferably, the polymer fiber mesh is a polyvinyl alcohol fiber mesh or a nanocellulose mesh, which has good water absorption; the concrete layer is a polyurethane concrete layer. Polyurethane polymer materials have good compressive strength, wear resistance, aging resistance, waterproof and corrosion resistance, high temperature resistance, elasticity, and toughness.

[0015] Preferably, the aqueous solution of the light stabilizer is formed by dispersing the light stabilizer in water, and the light stabilizer includes at least one of the following: ultraviolet absorber, ultraviolet shielder, quencher, free radical scavenger, and hydroperoxide decomposer.

[0016] To further enhance the strength of the main body, the surface of the polymer fiber web is coated with a second adhesive layer, and the surface of the second adhesive layer is covered with an asphalt layer.

[0017] To further enhance the adsorption capacity of the polymer fiber web to the light stabilizer aqueous solution, a hydrophilic coating is also provided between the polymer fiber web and the second adhesive layer.

[0018] Preferably, the hydrophilic coating is a PEG-modified silane coating.

[0019] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a method for paving the above-mentioned road pavement structure, characterized by comprising the following steps:

[0020] (1) Shot blasting treatment of the base layer:

[0021] (2) Apply the first adhesive to the surface of the base layer and lay the concrete on the first adhesive before the first adhesive gels;

[0022] (3) Fix the storage tank to the side of the base layer;

[0023] (4) The polymer fiber mesh is fully soaked in the light stabilizer aqueous solution, then laid on the surface of the concrete layer, and the ends of the polymer fiber mesh are inserted into the storage tank to form water-absorbing parts;

[0024] (5) Coat the surface of the polymer fiber mesh with a second adhesive, and before the second adhesive gels, spread the asphalt mixture on the second adhesive;

[0025] (6) Curing: the first adhesive forms the first bonding layer, the concrete forms the concrete layer, the second adhesive forms the second bonding layer, and the asphalt mixture forms the asphalt layer.

[0026] In order to further enhance the adsorption of the polymer fiber mesh to the light stabilizer aqueous solution, a hydrophilic coating is provided between the polymer fiber mesh and the second adhesive layer. In step (4), the surface of the polymer fiber mesh is first coated with a hydrophilic coating and then fully immersed in the light stabilizer aqueous solution.

[0027] Compared with the prior art, the advantages of this invention are as follows: By setting up a hydrophilic polymer fiber mesh and a storage tank for storing light stabilizer aqueous solution, the surface tension of the fibers promotes the flow of liquid, and the light stabilizer aqueous solution in the storage tank is uniformly absorbed and dispersed throughout the entire pavement structure, extending the UV resistance of the pavement structure and ensuring the full service life of the concrete; because the storage tank has a feeding port, the light stabilizer aqueous solution can be continuously or intermittently added to the storage tank, further extending the service life of the pavement structure;

[0028] Therefore, compared with the conventional one-time addition method of directly adding light stabilizer to the concrete or brushing light stabilizer onto the concrete surface, the present invention uses a pre-set storage tank and a hydrophilic polymer fiber network to absorb and disperse the light stabilizer aqueous solution, thereby adding light stabilizer to the concrete in a subsequent manner and enhancing the long-term UV resistance of the pavement structure.

[0029] Meanwhile, because the polymer fiber mesh has good tensile strength and is evenly distributed between concrete layers, it can further enhance the tensile properties of concrete, making it especially suitable for high-altitude areas. In other words, the polymer fiber mesh also plays a reinforcing role. Because the polymer fiber mesh itself has high tensile strength, the installation of the polymer fiber mesh is equivalent to reinforcing the main body, which can improve the tensile strength of the main body.

[0030] This invention employs a layered paving method, which is simple in process and suitable for large-scale applications. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of multiple entities cooperating;

[0033] Figure 3 for Figure 1 A schematic diagram showing the combination of the storage tank and the polymer fiber mesh. Detailed Implementation

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be understood that, unless otherwise stated, in the description of this invention patent, "multiple" means two or more, and the terms "upper," "lower," "left," "right," "top," "bottom," "front," "rear," etc., indicate the orientation or positional relationship based on the direction or positional relationship shown in the drawings. They are only for the convenience of describing this invention patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention patent.

[0036] In the description of this invention patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an adhesive connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention patent based on the specific circumstances. Example 1

[0037] like Figures 1-3 As shown, the road paving structure of this embodiment includes a main body and a storage tank 7, with the storage tank 7 fixedly disposed on the side of the main body.

[0038] The main body includes a base layer 1, a concrete layer 2, a first bonding layer 3, a polymer fiber mesh 4, a second bonding layer 5, and an asphalt layer 6. The first bonding layer 3 is disposed between the base layer 1 and the concrete layer 2 to bond the base layer 1 and the concrete layer 2. The storage tank 7 is welded to the side of the base layer 1. In this embodiment, the concrete layer 2 can be a polyurethane concrete layer, and the base layer 1 in this embodiment is a steel plate. Of course, the base layer can also be made of other materials, and the storage tank 7 can be a metal tank.

[0039] The storage tank 7 is used to store the aqueous solution of light stabilizer, and the top of the storage tank 7 is provided with a feeding port 71. A plug 72 is detachably installed in the feeding port 71, and the feeding port 71 can be opened or closed by inserting or removing the plug 72.

[0040] The polymer fiber mesh 4 is hydrophilic. It is laid on the concrete layer 2 and extends into the storage tank 7 from its side. The polymer fiber mesh 4 can adsorb and disperse the light stabilizer on it. In this embodiment, the polymer fiber mesh 4 is a polyvinyl alcohol fiber mesh, purchased from Changzhou Tianyi Engineering Fiber Co., Ltd., but it can also be a nanocellulose mesh.

[0041] Preferably, the mesh density of the polymer fiber web 4 is 100-400 g / m². 2 The light stabilizer aqueous solution is uniformly dispersed on the polymer fiber mesh 4, which not only prevents the light stabilizer from agglomerating and affecting the mechanical properties of the main body, but also makes all parts of the main body have the ability to resist ultraviolet aging; at the same time, the mesh density of the polymer fiber mesh 4 also ensures its tensile strength, thereby improving the tensile strength of the main body.

[0042] The light stabilizer aqueous solution is formed by dispersing a light stabilizer in water. The light stabilizer includes at least one of the following: ultraviolet absorber, ultraviolet shielder, quencher, free radical scavenger, and hydroperoxide decomposer. In this embodiment, the light stabilizer is titanium dioxide; however, other substances may also be used.

[0043] Better, such as Figure 3 As shown, the storage tank 7 is also equipped with a water-absorbing element 8, in which the light stabilizer aqueous solution is adsorbed. This prevents the light stabilizer from settling in the water. In this embodiment, the end of the polymer fiber mesh 4 is filled into the storage tank 7 to form the water-absorbing element 8. The end of the polymer fiber mesh 4 can be folded into a block or a ball to form the water-absorbing element 8. This not only simplifies the structure and eliminates the need for an additional water-absorbing element 8, but also eliminates concerns that the water-absorbing element 8 may have excessive adsorption force on the light stabilizer aqueous solution, preventing the polymer fiber mesh 4 from adsorbing the light stabilizer aqueous solution. Because the side of the storage tank 7 needs to be provided with an opening 73 for the polymer fiber mesh 4 to pass through, this opening 73 needs to be sealed to prevent leakage. For example, a sealing ring can be embedded in the opening 73, through which the polymer fiber mesh 4 passes.

[0044] The second adhesive layer 5 is coated on the polymer fiber mesh 4, and an asphalt layer 6 is also provided on the surface of the second adhesive layer 5.

[0045] The paving method for the road surface structure in this embodiment includes the following steps:

[0046] (1) The base layer 1 is shot blasted, specifically: the base layer 1 is shot blasted to remove rust until the cleanliness of the base layer 1 reaches Sa2.5 level and the roughness reaches 60 micrometers to 100 micrometers;

[0047] (2) Apply the first adhesive to the surface of the base layer 1 at a dosage of 0.15 kg / m² to 0.3 kg / m², and spread the concrete on the first adhesive before the first adhesive gels;

[0048] (3) Fix the storage tank 7 to the side of the base layer 1;

[0049] (4) The polymer fiber mesh 4 is fully soaked in the light stabilizer aqueous solution to prevent the subsequent concrete from clogging the mesh of the polymer fiber mesh 4. Then the soaked polymer fiber mesh 4 is laid on the concrete surface, and the end of the polymer fiber mesh 4 is inserted into the storage tank 7. The end of the polymer fiber mesh 4 is inserted into the storage tank 7 a little more to form the water-absorbing part 8.

[0050] (5) Coat the surface of the polymer fiber mesh 4 with a second adhesive, and before the second adhesive gels, spread the asphalt mixture on the second adhesive;

[0051] (6) Curing, the first adhesive forms the first bonding layer 3, the concrete forms the concrete layer 2, the second adhesive forms the second bonding layer 5, and the asphalt mixture forms the asphalt layer 6.

[0052] The first adhesive is the same as the adhesive layer in the Chinese invention patent application "Road Pavement Structure and Manufacturing Method Thereof" with patent application number CN202210132290.X (publication number CN114277636A); the second adhesive is HYE (second-stage epoxy resin adhesive type II) adhesive; the asphalt mixture is asphalt mastic; and the concrete can be existing polyurethane concrete.

[0053] like Figure 2 As shown, a storage tank 7 can be set between two adjacent main bodies. The ends of the polymer fiber webs 4 of the two main bodies extend into the storage tank 7, reducing the number of storage tanks 7 that need to be set. The feeding port 71 of the storage tank 7 needs to be exposed to facilitate feeding.

[0054] This embodiment utilizes a hydrophilic polymer fiber mesh 4 and a storage tank 7 for storing a light stabilizer aqueous solution. By using the surface tension of the fibers to promote liquid flow, the light stabilizer aqueous solution in the storage tank 7 is uniformly absorbed and dispersed throughout the entire pavement structure, extending the pavement structure's UV resistance and ensuring the full lifespan performance of the concrete. Because the storage tank 7 has a feeding port, the light stabilizer aqueous solution can be continuously or intermittently added to the storage tank 7, further extending the lifespan of the pavement structure.

[0055] Therefore, compared with the conventional one-time addition method of directly adding light stabilizer to the concrete or brushing light stabilizer onto the concrete surface, the present invention uses a pre-set storage tank 7 and a hydrophilic polymer fiber mesh 4 to absorb and disperse the light stabilizer aqueous solution, thereby adding light stabilizer to the concrete in a subsequent manner and enhancing the long-term UV resistance of the pavement structure.

[0056] Meanwhile, because the polymer fiber mesh 4 has good tensile strength and is evenly distributed between concrete layers, it can further enhance the tensile properties of concrete, making it especially suitable for high-altitude areas. In other words, the polymer fiber mesh 4 also plays a reinforcing role. Because the polymer fiber mesh 4 itself has high tensile strength, the installation of the polymer fiber mesh 4 is equivalent to reinforcing the main body, which can improve the tensile strength of the main body.

[0057] The paving structure of this embodiment was subjected to an accelerated UV aging test to simulate 15 years of outdoor UV radiation. Various indicators were measured before and after the aging test. The aging performance of specimens with 0, 1, and 2 additions of light stabilizer aqueous solution during the 15-year life cycle was compared. The interval between additions of light stabilizer aqueous solution was calculated according to the actual 5-year usage period. The test data are shown in the table below.

[0058]

[0059] The aging test method in this embodiment is as follows: a 1000W high-pressure mercury lamp is used, which mainly radiates 365nm long-wave ultraviolet light. Under the condition that the surface temperature of the road pavement structure is 70±3℃, an accelerated ultraviolet aging test is carried out. Since the ultraviolet lamp will reduce its lifespan if it works for a long time, it is stopped every 8 hours, cooled for 20 minutes, and then used again.

[0060] Methods for converting UV aging test time to natural aging time: 12 months of outdoor UV irradiation in low-altitude areas (East China and South China) can be converted to 4.25 days of indoor UV irradiation; 12 months of outdoor UV irradiation in high-altitude areas (Tibet) can be converted to 12.17 days of indoor UV irradiation.

[0061] The bonding strength test was conducted according to Appendix B of the Technical Specification for Design and Construction of Steel Bridge Deck for Highways: Bonding Strength Test Method.

[0062] The flexural tensile strength test is conducted according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" T0715, Asphalt Mixture Bending Test Method.

[0063] The fatigue performance test was conducted according to Appendix E of the Technical Specification for Design and Construction of Highway Steel Bridge Deck Pavement: Three-point Loading Composite Beam Fatigue Test Method. Example 2

[0064] The difference between Example 2 and Example 1 is that a hydrophilic coating is further provided between the polymer fiber web 4 and the second adhesive layer 5, which further enhances the adsorption capacity of the polymer fiber web 4 for the light stabilizer aqueous solution. In this example, the hydrophilic coating is a PEG-modified silane coating, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0065] The paving method in this embodiment differs from that in Embodiment 1 only in step (4):

[0066] In step (4), the surface of the polymer fiber mesh 4 is first coated with a hydrophilic coating and then immersed in an aqueous solution of light stabilizer.

[0067] The pavement structures of the two embodiments described above are applicable to the construction or paving of roads, stadiums, or similar projects (such as airports).

Claims

1. A pavement structure comprising a main body including a base layer (1), a concrete layer (2), and a first bonding layer (3) provided between the base layer (1) and the concrete layer (2) for bonding the base layer (1) and the concrete layer (2), characterized in that, The main body is provided with a storage tank (7) on the side, which is used to store light stabilizer aqueous solution, and the top of the storage tank (7) is provided with a filling port (71), in which a plug (72) is detachably installed. The main body further comprises a hydrophilic polymer fiber web (4) which is paved on the concrete layer (2), and the polymer fiber web (4) extends into the storage tank (7) from the side of the storage tank (7), which can adsorb and disperse the light stabilizer.

2. The pavement paving structure according to claim 1, characterized in that: The storage tank (7) is provided with a water absorbing element (8), and the light stabilizer aqueous solution is adsorbed in the water absorbing element (8).

3. The pavement paving structure of claim 2, wherein: The end of the polymer fiber web (4) is filled in the storage tank (7) to form the water absorbing element (8).

4. The pavement paving structure of claim 1, wherein: The mesh density of the polymer fiber web (4) is between 100-400 g / m 2 .

5. The pavement paving structure of claim 1, wherein: The polymer fiber web (4) is a polyvinyl alcohol fiber web or a nanocellulose web; the concrete layer (2) is a polyurethane concrete layer; the light stabilizer aqueous solution is formed by dispersing a light stabilizer in water, and the light stabilizer includes at least one of the following: ultraviolet absorber, ultraviolet shielding agent, quencher, free radical trapping agent, hydroperoxide decomposer.

6. Pavement construction according to any one of claims 1 to 5, characterized in that: The surface of the polymer fiber web (4) is coated with a second adhesive layer (5), and the surface of the second adhesive layer (5) is paved with an asphalt layer (6).

7. The pavement paving structure of claim 6, wherein: A hydrophilic coating is further provided between the polymer fiber web (4) and the second adhesive layer (5).

8. The pavement paving structure of claim 7, wherein: The hydrophilic coating is a PEG modified silane coating.

9. A method of laying a pavement structure as claimed in any one of claims 1 to 5, characterised in that, The method comprises the following steps: (1) performing shot blasting treatment on the base layer (1); (2) applying a first adhesive on the surface of the base layer (1), and before the first adhesive is cured, paving concrete on the first adhesive; (3) fixedly installing the storage tank (7) on the side of the base layer (1); (4) fully soaking the polymer fiber web (4) in the light stabilizer aqueous solution, then paving the polymer fiber web (4) on the concrete surface, and extending the end of the polymer fiber web (4) into the storage tank (7); (5) coating a second adhesive on the surface of the polymer fiber web (4), and before the second adhesive is cured, paving asphalt mixture on the second adhesive; (6) curing, and finally forming a first adhesive layer (3) by the first adhesive, a concrete layer (2) by the concrete, a second adhesive layer (5) by the second adhesive, and an asphalt layer (6) by the asphalt mixture.

10. The paving method of a pavement paving structure according to claim 9, characterized by: The surface of the polymer fiber web (4) is further coated with a hydrophilic coating, and in the step (4), the surface of the polymer fiber web (4) is coated with the hydrophilic coating first, and then soaked in the light stabilizer aqueous solution.

Images