Asphalt concrete panel anti-seepage structure and construction method

Abstract

The application provides an asphalt concrete panel anti-seepage structure and a construction method, and relates to the technical field of hydraulic engineering.The asphalt concrete panel anti-seepage structure comprises a leveling cementation layer, which is used for being paved on the top of a cushion layer; and an asphalt concrete anti-seepage layer, which is used for being paved on the top of the leveling cementation layer, and comprises an asphalt-rich anti-seepage layer located at the upper part and having an asphalt content greater than an aggregate content, and an aggregate-rich anti-seepage layer located at the bottom and having an aggregate content greater than an asphalt content.Compared with the prior art, the traditional structure relies on an independent sealing layer to realize surface anti-seepage, while the application forms a double anti-seepage mechanism through the differentiation of a single layer of material, the asphalt-rich anti-seepage layer directly undertakes the sealing function, thereby avoiding an additional construction process, the aggregate-rich anti-seepage layer improves the anti-deformation capacity of the structure, and reduces the risk of anti-seepage layer cracking caused by the deformation of the base layer.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, and more specifically, to an asphalt concrete panel seepage prevention structure and construction method. Background Technology

[0002] Asphalt concrete panels are widely used in the surface seepage prevention structures of hydraulic structures such as earth-rock dams, reservoirs, and canals to prevent liquid penetration, thereby maintaining the safety and functionality of the overall project.

[0003] Traditional hydraulic asphalt concrete panel waterproofing structures consist of three layers, from the inside out: a leveling and bonding layer (e.g., 10cm thick), an asphalt concrete waterproofing layer (e.g., 10cm thick), and a sealing layer (e.g., 2mm thick). During construction, each layer must be applied sequentially from the inside out. Before brushing or spraying the sealing layer, the surface of the asphalt concrete waterproofing layer must first be washed with water. After the surface dries, a layer of emulsified asphalt is sprayed. For contaminated areas of the asphalt concrete waterproofing layer, a thin layer of emulsified or diluted asphalt must be sprayed and applied. The sealing layer can only be applied after the emulsified asphalt has fully demulsified and dried. This construction process is very cumbersome and time-consuming. Although sealing layer pavers are now available, there may still be areas missed, requiring manual touch-ups when the sealing layer becomes less tacky, which is time-consuming and labor-intensive. Furthermore, the sealing layer is susceptible to wrinkling, blistering, or peeling due to changes in atmospheric temperature, humidity, and UV intensity, which in turn affects the overall waterproofing function of the asphalt panel. Summary of the Invention

[0004] The purpose of this invention is to provide an asphalt concrete panel seepage prevention structure, which has the advantages of good seepage prevention effect, simplified structure, convenient construction and shortened construction period.

[0005] This invention provides an asphalt concrete panel seepage prevention structure, comprising:

[0006] A leveling adhesive layer, which is used to spread on top of the subbase;

[0007] An asphalt concrete anti-seepage layer is used to be laid on top of the leveling cementitious layer. The asphalt concrete anti-seepage layer includes an upper asphalt-rich anti-seepage layer with an asphalt content greater than the aggregate content and a bottom aggregate-rich anti-seepage layer with an aggregate content greater than the asphalt content.

[0008] Optionally, the thickness 'a' of the asphalt concrete impermeable layer is 12cm to 15cm.

[0009] Optionally, the thickness b of the asphalt-rich impermeable layer is 1 cm to 2 cm.

[0010] Optionally, the asphalt concrete anti-seepage layer is dense-graded asphalt concrete, wherein the asphalt content c in the dense-graded asphalt concrete is calculated according to a first formula, which is expressed as:

[0011] .

[0012] Optionally, the filler in the dense-graded asphalt concrete accounts for 12% to 15% of the total weight of the aggregate, the maximum particle size of the aggregate is 16 mm, and the gradation index is 0.2 to 0.5.

[0013] Optionally, the asphalt-rich impermeable layer has an aggregate content of 20% to 30%, a porosity of ≤2%, and a permeability coefficient of ≤1×10⁻⁶. - 9 Asphalt concrete with a speed of cm / s.

[0014] The asphalt concrete panel seepage prevention structure provided by this invention has, but is not limited to, the following beneficial effects compared to related technologies:

[0015] The asphalt concrete panel anti-seepage structure of this invention is set on a subbase. The subbase is a layer of riprap material laid on the foundation surface (e.g., a dam / bedrock) to provide a stable foundation and improve the connection between the upper material and the foundation. It helps to distribute loads, reduce uneven settlement, and provide a certain degree of waterproofing. A leveling and bonding layer is located above the subbase. It is used for foundation leveling and improving the bonding effect between the asphalt concrete anti-seepage layer and the subbase. It has a certain degree of permeability to prevent air bubbles from forming due to water retention, thus preventing bulging problems in the asphalt concrete anti-seepage layer. This creates conditions for laying the asphalt concrete anti-seepage layer and ensures the stability and integrity of the upper structure. The asphalt concrete anti-seepage layer refers to a composite structural layer with self-sealing function. It includes an upper asphalt-rich anti-seepage layer with an asphalt content greater than the aggregate content and a bottom aggregate-rich anti-seepage layer with an aggregate content greater than the asphalt content. The asphalt-rich anti-seepage layer achieves pore filling through a high asphalt ratio, while the aggregate-rich anti-seepage layer forms a mechanically stable layer through aggregate accumulation. The leveling and bonding layer and the asphalt concrete anti-seepage layer can be formed by paving asphalt concrete with different proportions. During paving, the asphalt concrete anti-seepage layer can use asphalt mixtures with specific proportions. During compaction, vibration causes the aggregate to settle, forming an asphalt-rich anti-seepage layer at the top with a higher asphalt content than aggregate content, and an aggregate-rich anti-seepage layer at the bottom with a higher aggregate content than asphalt content. This process replaces traditional sealing layer construction, forming a continuous anti-seepage interface through material self-organization. Compared with related technologies, traditional structures rely on independent sealing layers to achieve surface anti-seepage, while this invention forms a dual anti-seepage mechanism through the differentiation of a single layer of material. The asphalt-rich anti-seepage layer directly undertakes the sealing function, avoiding additional construction procedures; the aggregate-rich anti-seepage layer improves the structure's resistance to deformation, reducing the risk of cracking in the anti-seepage layer due to base layer deformation.

[0016] In addition, the present invention also provides a construction method for an asphalt concrete panel seepage prevention structure, comprising:

[0017] Paving and compaction tests were conducted to determine the first construction mix proportion and first compaction parameters corresponding to the leveling cementitious layer, as well as the second construction mix proportion and second compaction parameters corresponding to the asphalt concrete anti-seepage layer.

[0018] The first asphalt mixture corresponding to the leveling and bonding layer and the second asphalt mixture corresponding to the asphalt concrete impermeable layer are prepared according to the first construction mix ratio and the second construction mix ratio, respectively.

[0019] The first asphalt mixture is spread on the surface of the subbase to form the leveling cement layer, and the leveling cement layer is compacted according to the first compaction parameters;

[0020] The second asphalt mixture is spread on the surface of the leveled cementitious layer to form the asphalt concrete anti-seepage layer, and the asphalt concrete anti-seepage layer is compacted according to the second compaction parameters, so that the aggregate in the asphalt concrete anti-seepage layer is vibrated to the bottom of the asphalt concrete anti-seepage layer during the compaction process, thereby differentiating the asphalt concrete anti-seepage layer into an asphalt-rich anti-seepage layer located at the top with an asphalt content greater than the aggregate content and an aggregate-rich anti-seepage layer located at the bottom with an aggregate content greater than the asphalt content.

[0021] Optionally, the first compaction parameters and the second compaction parameters are determined by compaction tests based on on-site raw materials and actual construction equipment. The aggregate content, porosity, and permeability coefficient of the asphalt-rich anti-seepage layer, the aggregate-rich anti-seepage layer, and the leveling cementitious layer are tested by core drilling to ensure that the design requirements are met.

[0022] Optionally, the step of compacting the asphalt concrete impermeable layer according to the second compaction parameters includes:

[0023] By controlling the second compaction parameters, the asphalt concrete anti-seepage layer is compacted and vibrated, so that the aggregate located on the surface of the asphalt concrete anti-seepage layer is compacted and vibrated to the bottom layer of the asphalt concrete anti-seepage layer. The second compaction parameters include the number of compaction passes and the impact force of the roller.

[0024] Optionally, after the asphalt-rich anti-seepage layer has completely aged, the aged asphalt-rich anti-seepage layer is scraped off, and asphalt mastic is applied to the surface of the aggregate-rich anti-seepage layer for repair. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the asphalt concrete panel seepage prevention structure according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Leveling cementitious layer; 2. Asphalt concrete anti-seepage layer; 21. Asphalt-rich anti-seepage layer; 22. Aggregate-rich anti-seepage layer; 3. Subbase; 4. Dam / bedrock. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] In the description of this invention, the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "top," "bottom," "front," "back," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this invention. They are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0032] like Figure 1 As shown, the asphalt concrete panel seepage prevention structure of this invention includes:

[0033] Leveling adhesive layer 1, which is used to be spread on top of the padding layer 3;

[0034] The asphalt concrete anti-seepage layer 2 is used to be laid on top of the leveling cementitious layer 1. The asphalt concrete anti-seepage layer 2 includes an asphalt-rich anti-seepage layer 21 located at the top with an asphalt content greater than the aggregate content and an aggregate-rich anti-seepage layer 22 located at the bottom with an aggregate content greater than the asphalt content.

[0035] In this embodiment, in conjunction with the appendix Figure 1 As shown, the asphalt concrete panel waterproofing structure of the present invention is disposed on the subbase 3, which is laid on the foundation surface (e.g., attached). Figure 1 The first layer of rockfill material on the dam / bedrock (4) provides a stable foundation and improves the connection between the upper material and the foundation. It helps to distribute the load, reduce uneven settlement, and provide some water-proofing. The leveling and bonding layer 1 is located above the subbase 3. It is used for foundation leveling and improving the bonding effect between the asphalt concrete anti-seepage layer 2 and the subbase 3. It has a certain degree of permeability to prevent air bubbles from forming due to water retention, which could cause bulging problems in the asphalt concrete anti-seepage layer 2. It creates conditions for laying the asphalt concrete anti-seepage layer 2 and ensures the stability and integrity of the upper structure. The asphalt concrete anti-seepage layer 2 is a composite structural layer with self-sealing function. It includes an asphalt-rich anti-seepage layer 21 located at the top with an asphalt content greater than the aggregate content, and an aggregate-rich anti-seepage layer 22 located at the bottom with an aggregate content greater than the asphalt content. The asphalt-rich anti-seepage layer 21 achieves pore filling through a high asphalt ratio, while the aggregate-rich anti-seepage layer 22 forms a mechanically stable layer through aggregate accumulation. The leveling and bonding layer 1 and the asphalt concrete anti-seepage layer 2 can be formed by paving asphalt concrete with different proportions.

[0036] During paving, the asphalt concrete anti-seepage layer 2 can use asphalt mixtures with specific proportions. During compaction, vibration causes the aggregates to settle, forming an asphalt-rich anti-seepage layer 21 at the top with an asphalt content greater than the aggregate content, and an aggregate-rich anti-seepage layer 22 at the bottom with an aggregate content greater than the asphalt content. This process replaces traditional sealing layer construction, forming a continuous anti-seepage interface through material self-organization.

[0037] Compared with related technologies, traditional structures rely on independent sealing layers to achieve surface seepage prevention, while this invention forms a dual seepage prevention mechanism through the differentiation of a single layer of material. The asphalt-rich seepage prevention layer 21 directly undertakes the sealing function, avoiding additional construction procedures; the aggregate-rich seepage prevention layer 22 improves the structure's resistance to deformation and reduces the risk of seepage prevention layer cracking caused by base layer deformation.

[0038] Furthermore, traditional asphalt concrete panels, after aging and peeling, require complete removal and repaving of the damaged areas. In this invention, the asphalt concrete waterproofing layer 2 includes an upper asphalt-rich waterproofing layer 21, which resists minor damage, spalling, and peeling of the panel surface. Even if the asphalt-rich waterproofing layer 21 completely ages and peels off, it can be repaired simply by scraping it off and applying an asphalt mastic sealant layer. Therefore, compared to traditional asphalt concrete panel structures, this invention extends the lifespan of asphalt concrete panels, improves the waterproofing capacity of the asphalt concrete waterproofing layer, allows for simple secondary repairs, improves the quality of the asphalt concrete waterproofing panel, reduces repair costs, and saves investment.

[0039] Optionally, the thickness a of the asphalt concrete impermeable layer 2 is 12cm to 15cm.

[0040] In this embodiment, in conjunction with the appendix Figure 1 As shown, the thickness of the asphalt concrete anti-seepage layer 2 refers to the vertical distance from the surface of the leveled cementitious layer 1 to the top surface of the asphalt concrete anti-seepage layer 2. The thickness 'a' of the asphalt concrete anti-seepage layer 2 is preferably 12cm to 15cm, and this thickness range is determined based on a balance between anti-seepage performance and construction efficiency. The lower limit of the thickness ensures that the anti-seepage layer has sufficient anti-seepage capacity, while the upper limit avoids material waste and excessively long construction periods.

[0041] Optionally, the thickness b of the asphalt-rich impermeable layer 21 is 1 cm to 2 cm.

[0042] In this embodiment, the thickness b of the asphalt-rich geomembrane 21, ranging from 1 cm to 2 cm, refers to the vertical dimension range of the layer. This range ensures sufficient asphalt content on the surface to resist penetration while avoiding a decrease in material stability due to excessive thickness. The asphalt-rich geomembrane 21 has less aggregate and more asphalt, making it dense, viscous, and with a low permeability coefficient. Compared to the sealing layer of traditional structures (typically 2 mm thick), the asphalt-rich geomembrane 21 is thicker and provides better seepage prevention.

[0043] Optionally, the asphalt concrete impermeable layer 2 is dense-graded asphalt concrete, wherein the asphalt content c in the dense-graded asphalt concrete is calculated according to a first formula, which is expressed as:

[0044] .

[0045] In this embodiment, in conjunction with the appendix Figure 1 As shown, dense-graded asphalt concrete refers to an asphalt mixture with continuous aggregate gradation and a void ratio below a set threshold. This can be achieved by adjusting the proportion of aggregates of different particle sizes. Its continuous gradation characteristic is beneficial for forming a uniform and dense structural layer. The asphalt content of dense-graded asphalt concrete can be calculated using the first formula mentioned above, thus precisely controlling the ratio of asphalt to aggregates during the mixture preparation stage. This calculation method avoids the deviation in asphalt content caused by raw material fluctuations in traditional empirical methods, thereby preventing aggregate stripping due to insufficient asphalt or structural deformation caused by excessive asphalt.

[0046] Optionally, the filler in the dense-graded asphalt concrete accounts for 12% to 15% of the total weight of the aggregate, the maximum particle size of the aggregate is 16 mm, and the gradation index is 0.2 to 0.5.

[0047] In this embodiment, the filler content of 12% to 15% of the total aggregate weight refers to the range of fine particulate matter proportions in the aggregate, which can be achieved by adding limestone powder or mineral powder. This proportion optimizes the adhesion between asphalt and aggregate and reduces porosity in the mixture. The maximum aggregate size of 16mm refers to the upper limit of aggregate particle size in the mixture, which can be controlled by screening. This size balances the density of the aggregate skeleton with workability. The gradation index of 0.2 to 0.5 refers to the slope parameter of the aggregate particle size distribution curve, which can be achieved by adjusting the proportion of aggregates with different particle sizes. This range ensures that the mixture forms a continuous gradation structure to improve impermeability.

[0048] Specifically, dense-graded asphalt concrete achieves a tight bond between asphalt and aggregates by controlling the filler ratio, aggregate size, and gradation index. Increasing the filler ratio enhances the adhesion of the asphalt binder, while fine particles fill the gaps between aggregates to reduce porosity. Limiting the maximum aggregate size to 16mm avoids seepage channels caused by coarse particle accumulation. When the gradation index is between 0.2 and 0.5, the aggregate size distribution tends to be continuous, further reducing the probability of interconnected pores within the mixture, thus forming a uniform and dense impermeable layer structure.

[0049] Optionally, the asphalt-rich impermeable layer 21 has an aggregate content of 20% to 30%, a porosity of ≤2%, and a permeability coefficient of ≤1×10⁻⁶. -9 Asphalt concrete with a speed of cm / s.

[0050] In this embodiment, an aggregate content of 20% to 30% refers to the percentage range of mineral aggregates in the total mass of the asphalt concrete mixture. This can be achieved by adjusting the ratio of aggregate gradation to asphalt admixture. This range balances impermeability and structural stability. A porosity of ≤2% refers to the upper limit of the proportion of internal void volume to the total volume of the asphalt concrete mixture. This can be achieved by optimizing the compaction process and material proportions. Low porosity helps to block seepage paths. A permeability coefficient of ≤1×10⁻⁶ is also included. -9 cm / s refers to the seepage velocity limit of a material under a unit hydraulic gradient, which can be achieved by controlling the asphalt content and density. This indicator directly reflects the impermeability of the anti-seepage layer.

[0051] In addition, the present invention also provides a construction method for an asphalt concrete panel seepage prevention structure, comprising:

[0052] Paving and compaction tests were conducted to determine the first construction mix ratio and first compaction parameters corresponding to the leveling cementitious layer 1, and the second construction mix ratio and second compaction parameters corresponding to the asphalt concrete anti-seepage layer 2, respectively.

[0053] The first asphalt mixture corresponding to the leveling and bonding layer 1 and the second asphalt mixture corresponding to the asphalt concrete impermeable layer 2 are prepared according to the first construction mix ratio and the second construction mix ratio, respectively.

[0054] The first asphalt mixture is spread on the surface of the subbase 3 to form the leveling cement layer 1, and the leveling cement layer 1 is compacted according to the first compaction parameters;

[0055] The second asphalt mixture is spread on the surface of the leveled cementitious layer 1 to form the asphalt concrete anti-seepage layer 2, and the asphalt concrete anti-seepage layer 2 is compacted according to the second compaction parameters, so that the aggregate in the asphalt concrete anti-seepage layer 2 is vibrated to the bottom of the asphalt concrete anti-seepage layer 2 during the compaction process, thereby differentiating the asphalt concrete anti-seepage layer 2 into an asphalt-rich anti-seepage layer 21 located at the top with an asphalt content greater than the aggregate content and an aggregate-rich anti-seepage layer 22 located at the bottom with an aggregate content greater than the asphalt content.

[0056] In this embodiment, the paving test refers to the experimental process of determining the paving process parameters of the mixture based on actual construction conditions at the construction site. Specifically, this can be achieved by adjusting paving speed, temperature, and thickness parameters to ensure uniform distribution of the mixture and achieving the preset density. The compaction test refers to the experimental process of verifying the compaction effect through different combinations of compaction equipment and process parameters. Specifically, this can be achieved by adjusting vibration frequency, number of compaction passes, and roller travel speed to screen out construction parameters that meet the porosity and permeability requirements. The construction mix proportion refers to the ratio of aggregates, fillers, and asphalt in the asphalt mixture. This can be determined through laboratory mix design combined with on-site verification to ensure that the workability and mechanical properties of the mixture meet design requirements. Compaction parameters refer to the control indicators of equipment operating status and process conditions during compaction construction. Specifically, these may include the number of compaction passes and roller impact force, used to promote aggregate settling and the formation of a layered structure through mechanical vibration.

[0057] Specifically, during construction, the mix proportions (first and second construction mix proportions) and compaction parameters (first and second rolling parameters) of the leveling binder layer 1 and the asphalt concrete anti-seepage layer 2 are first determined through experiments. Then, the corresponding asphalt mixtures (first and second asphalt mixtures) are prepared according to these proportions. After the leveling binder layer 1 is laid, it is compacted using matching rolling parameters to form a stable base layer. After the asphalt concrete anti-seepage layer 2 is laid, a specific vibratory compaction process is used to allow the surface aggregate to settle to the bottom layer, ultimately forming a composite structure of an upper asphalt-rich anti-seepage layer 21 and a bottom aggregate-rich anti-seepage layer 22. This process achieves self-organized stratification of the internal materials of the asphalt concrete anti-seepage layer 2 through a single paving combined with differentiated compaction, eliminating the need for an additional sealing layer.

[0058] Compared with existing technologies, traditional methods require three-layer construction and rely on manual application of the sealing layer, while this method directly forms a composite structure with anti-seepage function through single-layer paving and vibratory compaction, eliminating the sealing layer construction process.

[0059] It should be noted that before constructing the asphalt concrete panel anti-seepage structure, the subbase 3 needs to be prepared. The preparation of subbase 3 includes ensuring that the thickness of the compacted subbase 3 is, for example, 2m, the unevenness is less than, for example, 30mm, and that emulsified asphalt is sprayed on the surface.

[0060] Optionally, the first compaction parameters and the second compaction parameters are determined by compaction tests based on on-site raw materials and actual construction equipment, and the aggregate content, porosity and permeability coefficient of the asphalt-rich anti-seepage layer 21, the aggregate-rich anti-seepage layer 22 and the leveling cementitious layer 1 are tested by core drilling to ensure that the design requirements are met.

[0061] In this embodiment, the first and second compaction parameters refer to the compaction process parameters determined through field tests. Specifically, these parameters can be achieved through combinations of vibration frequency, compaction speed, number of compaction passes, roller impact force, and temperature control. Their function is to dynamically adjust the compaction effect according to different construction conditions and material properties, ensuring that each structural layer reaches the designed density. Core drilling refers to obtaining core samples from the structural layers through mechanical drilling for physical property testing. This can be achieved using a rotary coring machine with a diamond drill bit. Its function is to directly verify the uniformity of aggregate distribution, porosity, and impermeability of each layer after construction, avoiding substandard impermeability due to construction errors.

[0062] Specifically, during construction, compaction tests need to be conducted separately for different structural layers. Based on the characteristics of the raw materials used on site and the performance of the equipment, the optimal combination of parameters such as vibration frequency, compaction speed, number of compaction passes, roller impact force, and temperature control is determined. After compaction, core samples are extracted from the asphalt-rich impermeable layer 21, the aggregate-rich impermeable layer 22, and the leveling cementitious layer 1 using core drilling. The results are used to test whether the aggregate content meets the layered design requirements, whether the porosity is below the preset threshold, and whether the permeability coefficient meets the impermeability standards. If the test results do not meet the standards, the construction parameters need to be adjusted and the tests repeated until the performance indicators of each layer meet the requirements.

[0063] Optionally, the step of compacting the asphalt concrete impermeable layer 2 according to the second compaction parameters includes:

[0064] By controlling the second compaction parameters, the asphalt concrete anti-seepage layer 2 is compacted and vibrated, so that the aggregate located on the surface of the asphalt concrete anti-seepage layer 2 is compacted and vibrated to the bottom layer of the asphalt concrete anti-seepage layer 2. The second compaction parameters include the number of compaction passes and the impact force of the roller.

[0065] Optionally, after the asphalt-rich impermeable layer 21 has completely aged, the aged asphalt-rich impermeable layer 21 is scraped off, and asphalt mastic is applied to the surface of the aggregate-rich impermeable layer 22 for repair.

[0066] In this embodiment, scraping off the aged asphalt-rich impermeable layer 21 refers to completely peeling off the failed asphalt concrete surface layer by mechanical or manual means. This operation can remove cracks or peeling caused by aging, providing a smooth base surface for subsequent repair. Repairing by applying asphalt mastic involves uniformly laying a high-adhesion asphalt mixture on the surface of the aggregate-rich impermeable layer 22, which can be achieved by spraying or scraping. After curing, the asphalt mastic forms a continuous sealing layer, restoring the impermeability.

[0067] Specifically, when the asphalt-rich anti-seepage layer 21 ages due to long-term environmental effects, the surface is completely removed down to the interface of the aggregate-rich anti-seepage layer 22 using milling equipment. Then, asphalt mastic is directly applied to the cleaned base surface. No pretreatment of the base surface or the setting of a sealing layer is required during the coating process. The asphalt mastic fills the gaps between the aggregates through its own fluidity, and after curing, it forms an integral anti-seepage structure with the aggregate-rich anti-seepage layer 22.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0069] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An asphalt concrete panel impervious structure, characterized by, Comprise: a leveling cement layer (1) for paving on the cushion (3); an asphalt concrete impervious layer (2) for paving on the leveling cement layer (1), the asphalt concrete impervious layer (2) comprising an asphalt-rich impervious layer (21) at the upper part and an aggregate-rich impervious layer (22) at the bottom part; The thickness a of the asphalt concrete impervious layer (2) is 12-15 cm; The thickness b of the asphalt-rich impervious layer (21) is 1-2 cm; The asphalt concrete impervious layer (2) is a dense-graded asphalt concrete, wherein the asphalt content c in the dense-graded asphalt concrete is calculated according to a first formula, which is expressed as: ； The asphalt-rich impervious layer (21) is an asphalt concrete with an aggregate content of 20-30%, a porosity of ≤2%, and a permeability coefficient of ≤1×10-9 cm / s.

2. The asphalt concrete face panel impervious structure according to claim 1, characterized by, The filler in the dense-graded asphalt concrete accounts for 12-15% of the total weight of the mineral aggregate, the maximum particle size of the aggregate is 16 mm, and the grading index is 0.2-0.

5.

3. A method for constructing an asphalt concrete panel impervious structure based on the asphalt concrete panel impervious structure according to any one of claims 1 to 2, characterized by, The construction method of the asphalt concrete panel impervious structure comprises: Performing paving tests and rolling tests to determine the first construction mix ratio and the first rolling parameters corresponding to the leveling cement layer (1), and the second construction mix ratio and the second rolling parameters corresponding to the asphalt concrete impervious layer (2); Preparing the first asphalt mixture corresponding to the leveling cement layer (1) according to the first construction mix ratio, and the second asphalt mixture corresponding to the asphalt concrete impervious layer (2) according to the second construction mix ratio; Paving the first asphalt mixture on the surface of the cushion (3) to form the leveling cement layer (1), and rolling the leveling cement layer (1) according to the first rolling parameters; Paving the second asphalt mixture on the surface of the leveling cement layer (1) to form the asphalt concrete impervious layer (2), and rolling the asphalt concrete impervious layer (2) according to the second rolling parameters, so that the aggregate in the asphalt concrete impervious layer (2) is vibrated to the bottom of the asphalt concrete impervious layer (2) during rolling, thereby differentiating the asphalt concrete impervious layer (2) into the asphalt-rich impervious layer (21) at the upper part and the aggregate-rich impervious layer (22) at the bottom part.

4. The method of constructing an asphalt concrete face panel impervious structure according to claim 3, wherein The first rolling parameters and the second rolling parameters are determined according to the rolling tests of the on-site raw materials and actual construction equipment, and the aggregate content, porosity, and permeability coefficient corresponding to the asphalt-rich impervious layer (21), the aggregate-rich impervious layer (22), and the leveling cement layer (1) are detected by drilling and coring to ensure that the design requirements are met.

5. The method of constructing an impermeable asphalt concrete panel according to claim 3, wherein The rolling of the asphalt concrete impervious layer (2) according to the second rolling parameters comprises: The asphalt concrete impervious layer (2) is rolled and vibrated by controlling the second rolling parameter, so that the aggregate in the surface layer of the asphalt concrete impervious layer (2) is rolled and vibrated to the bottom layer of the asphalt concrete impervious layer (2), wherein the second rolling parameter comprises rolling times and rolling and vibrating force.

6. The method of constructing an impermeable asphalt concrete panel according to claim 3, wherein When the asphalt-rich impervious layer (21) is completely aged, the aged asphalt-rich impervious layer (21) is scraped off, and asphalt mastic is brushed on the surface of the aggregate-rich impervious layer (22) for repair.

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