Assembly type permeable pavement modification method for heavy metal adsorption and assembly type permeable pavement system

Abstract

The invention relates to an assembly type permeable pavement modification method for heavy metal adsorption and an assembly type permeable pavement system. The fabricated permeable pavement system comprises a lower impervious concrete base layer, an upper fabricated permeable concrete base layer and a fabricated permeable concrete pavement which are sequentially arranged from bottom to top; the assembly type pervious concrete upper base layer is a concrete base layer treated by an assembly type pervious concrete interface modifier; the fabricated pervious concrete pavement is a concrete pavement treated by a fabricated pervious concrete interface modifier. Compared with an existing assembly type permeable pavement, the problem that heavy metal elements contained in rainwater cannot be continuously and effectively captured by a traditional permeable pavement is solved. According to the method and the prefabricated slab system, heavy metal in rainwater can be effectively adsorbed, the mechanical property of pervious concrete is improved, meanwhile, the adsorption area of a modifier can be effectively increased through the prefabricated slab, and the efficiency of capturing heavy metal elements in rainwater by a pervious road surface is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of assembled permeable pavement, and in particular to an assembled permeable pavement modification method for heavy metal adsorption and an assembled permeable pavement system. Background Art

[0002] Permeable pavement is an important low-impact development technology in sponge city construction. Permeable concrete is made of aggregates of specific grading through a special process. Since permeable concrete has less slurry and a short initial setting time, it is not suitable to stay for a long time after mixing, so most of the permeable cement concrete is mixed on-site. On-site mixing of permeable cement concrete is usually accompanied by problems such as complex construction process, difficult to control construction quality, and long maintenance time. Prefabricated cement concrete has significant advantages such as short construction time, fast traffic opening, small traffic disturbance, simple maintenance, and small environmental impact. It is widely used in rapid maintenance projects or new construction projects of airports, roads, ports and other projects.

[0003] In addition, with the rapid development of industrialization, cities and industrial areas are often faced with the challenge of heavy metal pollution in storm runoff. Among them, heavy metals such as Pb, Cu, Zn, and Ni are acutely toxic to aquatic organisms and persist in the food chain, becoming an increasingly serious environmental hazard. Traditional permeable pavements are difficult to continuously and effectively capture heavy metal elements contained in surface runoff and have certain limitations.

[0004] CN107021539A discloses a composite permeable pavement system that can intercept heavy metals, including a permeable pavement and a post-processing system. The permeable pavement is composed of a permeable pavement layer, a permeable upper base layer, a permeable lower base layer, a cushion layer and a roadbed from top to bottom; the post-processing system includes a diversion pipe, a horizontal filter column, a heavy metal adsorption material and a pipeline inspection well. The heavy metal adsorption material is a mixed material of sodium titanate nanofibers and activated carbon particles. When it rains, rainwater runoff carrying heavy metals is initially filtered through the permeable pavement, and then enters the post-processing system through the diversion pipe for strong adsorption and interception. The final effluent can be injected into the ground as a clean water source to replenish groundwater, but the system uses a mixed material of sodium titanate nanofibers and activated carbon particles for adsorption, and there are problems such as complex permeable pavement construction and long construction period. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a prefabricated permeable pavement modification method and a prefabricated permeable pavement system for heavy metal adsorption. The prefabricated permeable concrete upper base and the prefabricated permeable concrete pavement are treated with a prefabricated permeable concrete interface modifier to solve the problem that the current permeable concrete cannot achieve high-efficiency adsorption of heavy metals in rainwater and the permeable pavement construction is complicated and the construction period is long.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The first object of the present invention is to provide an assembled permeable pavement system with a heavy metal adsorption function, wherein the assembled permeable pavement system with a heavy metal adsorption function comprises an impermeable concrete lower base, an assembled permeable concrete upper base and an assembled permeable concrete pavement arranged in sequence from bottom to top; the heavy metal adsorption rate in the assembled permeable pavement system with a heavy metal adsorption function is greater than 70%; the assembled permeable concrete upper base is a concrete base treated with an assembled permeable concrete interface modifier; and the assembled permeable concrete pavement is a concrete pavement treated with an assembled permeable concrete interface modifier.

[0008] The assembled permeable pavement system with heavy metal adsorption function adopts a prefabricated standard section structure, which can quickly realize assembly construction, reduce construction period, and the maintenance and repair of the road surface in the later stage are relatively simple and convenient. At the same time, the board surface of the pavement structure of the present invention is treated during the prefabrication process. When rainwater passes through the assembled permeable concrete pavement and the assembled permeable concrete upper base, the surface modification material will adsorb the heavy metal elements in the rainwater. After the rainwater passes through the assembled permeable concrete pavement and the assembled permeable concrete upper base, it is quickly discharged through the rapid drainage system in the impermeable concrete lower base, reducing the burden on urban drainage facilities and preventing river flooding.

[0009] Furthermore, the prefabricated permeable pavement system with heavy metal adsorption function also includes a drainage pipe component arranged in the impermeable concrete subbase.

[0010] Furthermore, the drainage pipe assembly is a rapid drainage mechanism, including a beam pipe installed in the base structure under the impermeable concrete, vertical pipes evenly distributed in the grooves on the top of the beam pipe, and a filter installed on the beam pipe.

[0011] Furthermore, the prefabricated permeable concrete interface modifier includes water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%; the pH of the prefabricated permeable concrete interface modifier is adjusted to between 7.6 and 8.5 by a pH regulator.

[0012] Furthermore, the pH regulator is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

[0013] Furthermore, the preparation method of the prefabricated permeable concrete interface modifier comprises gradually adding diammonium hydrogen phosphate into water while stirring, mixing, and adjusting the pH to 7.6-8.5 to obtain the interface modifier.

[0014] Furthermore, in the preparation method of the prefabricated permeable concrete interface modifier, it is necessary to gradually add diammonium hydrogen phosphate into the water while stirring to ensure that the diammonium hydrogen phosphate is completely dissolved and evenly distributed in the solution.

[0015] Furthermore, the prefabricated permeable concrete upper base layer includes a prefabricated permeable concrete panel and an assembly component; the prefabricated permeable concrete panel and the assembly component are connected.

[0016] Furthermore, the permeable concrete prefabricated panel is in a triangular shape; a plurality of permeable concrete prefabricated panels are spliced ​​and connected by assembly components; and the assembled permeable concrete upper base and the impermeable concrete lower base form a slope.

[0017] The second object of the present invention is to provide a method for modifying an assembled permeable pavement for heavy metal adsorption, which is used to prepare an assembled permeable pavement system with heavy metal adsorption function. The method comprises the following steps:

[0018] (1) Surface cleaning of concrete base and / or concrete pavement;

[0019] (2) After the surface is cleaned, the prefabricated permeable concrete interface modifier is evenly applied to the concrete base and / or concrete pavement surface to further obtain the prefabricated permeable concrete upper base and / or prefabricated permeable concrete pavement.

[0020] Furthermore, for the assembled permeable concrete upper base, when a plurality of permeable concrete prefabricated panels are spliced ​​to obtain the assembled permeable concrete upper base, the method comprises the following steps:

[0021] (1) Clean the surface of the permeable concrete precast panel;

[0022] (2) After the surface is cleaned, the prefabricated permeable concrete interface modifier is evenly applied to the surface of the prefabricated permeable concrete panel, and multiple prefabricated permeable concrete panels are spliced ​​and connected by assembly components to obtain the prefabricated permeable concrete upper base.

[0023] Furthermore, the method specifically includes the following steps (taking the assembled permeable concrete upper base as an example):

[0024] Step 1: preparing an assembled permeable concrete interface modifier, wherein the assembled permeable concrete interface modifier is mainly composed of a mixture of water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%;

[0025] When mixing water and diammonium hydrogen phosphate, diammonium hydrogen phosphate should be gradually added while stirring. After complete mixing, the pH should be adjusted to between 7.6-8.5.

[0026] The solution for adjusting pH should be 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0027] Step 2: Negative pressure treatment of the permeable concrete precast panel, placing the permeable concrete precast panel at 25°C and 133Pa for 24 hours.

[0028] Step 3: Surface treatment of permeable concrete precast panels

[0029] Before modifying the permeable concrete precast slab, the slab surface needs to be cleaned to keep it clean and free of debris.

[0030] Apply the prefabricated permeable concrete interface modifier liquid evenly on the permeable concrete prefabricated board, and the amount applied each time is 0.054g / cm 2 , treatment times 10 times, treatment interval 24h.

[0031] Furthermore, the board surface is cleaned by brushing.

[0032] Furthermore, in the method for modifying the interface of the permeable concrete precast board provided by the present invention, the step (2) is to evenly apply the modifier to the surface of the permeable concrete precast board after the surface cleaning step (1) of the permeable concrete precast board is completed, and the amount of each application is controlled to be 0.054 g / cm 2 , treatment times 10 times, treatment interval 24h.

[0033] Furthermore, the prefabricated permeable concrete upper base and / or prefabricated permeable concrete pavement obtained in step (2) is used to assemble the prefabricated permeable pavement system with the heavy metal adsorption function.

[0034] Furthermore, the assembly of the assembled permeable pavement system with heavy metal adsorption function includes the following process:

[0035] placing the drainage pipe assembly in an impermeable concrete subbase;

[0036] Splicing and connecting a plurality of prefabricated permeable concrete panels treated with an assembled permeable concrete interface modifier through assembly components to obtain an assembled permeable concrete upper base;

[0037] Connect the prefabricated permeable concrete upper base with the impermeable concrete lower base to form a slope;

[0038] Connecting the assembled permeable concrete pavement with the assembled permeable concrete upper base;

[0039] The impermeable concrete lower base, the assembled permeable concrete upper base and the assembled permeable concrete pavement are arranged in sequence from bottom to top. The technical concept of the present invention is as follows:

[0040] The permeable concrete slab (permeable concrete precast slab) is pre-treated with modified substances in advance to enable it to have heavy metal adsorption capacity. In addition, a prefabricated slab for assembled permeable pavement (permeable concrete precast slab) is provided, which increases the surface modification area, optimizes the flow, flow rate and residence time of rainwater in the permeable pavement, improves the heavy metal adsorption efficiency, and constructs an assembled permeable concrete pavement precast slab with simple construction, strong bearing capacity and heavy metal adsorption function, which is used to assemble an assembled permeable pavement system with heavy metal adsorption function.

[0041] The prefabricated permeable concrete slab is combined with the modified road surface slab. The first layer (prefabricated permeable concrete pavement) pre-treats the rainwater for heavy metal adsorption, and the second layer uses triangular permeable concrete prefabricated slabs to collect rainwater. The flow and flow rate of rainwater are optimized through triangular permeable concrete slabs to ensure the maximum effective adsorption of heavy metals in rainwater (the purpose is to make the rainwater evenly distributed in the permeable concrete). Through the isolation of the third layer of impermeable pavement layer (impermeable concrete base), the rainwater is quickly discharged from the pavement structure through drainage pipes.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1) The technical solution provides a prefabricated permeable pavement modification method for heavy metal adsorption and a prefabricated permeable pavement system, which can achieve effective adsorption of heavy metal elements. The present invention uses a phosphate solution to pretreat the permeable concrete, and increases the surface modification area through a triangular permeable concrete prefabricated plate, thereby improving the adsorption efficiency and controlling the flow path and flow rate of rainwater.

[0044] 2) The assembled permeable pavement modification method and assembled permeable pavement system for heavy metal adsorption provided by the technical solution can effectively improve the road bearing capacity. The permeable concrete interface modifier of the present invention can effectively improve the strength of permeable concrete.

[0045] 3) The assembled permeable pavement modification method and assembled permeable pavement system for heavy metal adsorption provided by this technical solution adopts an assembled structure, which is convenient for construction, reduces the impact of on-site construction on the surrounding environment, and ensures construction quality. Compared with ordinary cast-in-place permeable concrete pavement, the construction period is shortened by 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of the assembled permeable pavement system with heavy metal adsorption function of the present invention.

[0047] Figure 2 It is a structural schematic diagram of the assembled permeable concrete upper base of the present invention.

[0048] Figure 3 It is a schematic structural diagram of the drainage pipe assembly of the present invention.

[0049] The numbers in the figure show:

[0050] 1-impermeable concrete lower base, 2-assembled permeable concrete upper base, 3-assembled permeable concrete pavement, 4-drainage pipe assembly, 21-permeable concrete precast panel, 22-assembly component, 41-beam pipe, 42-vertical pipe, 43, filter screen. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0052] Features such as component models, material names, connection structures, control methods, etc. that are not explicitly described in the present invention are deemed to be common technical features disclosed in the prior art.

[0053] The present invention relates to the technical field of assembled permeable pavement, and specifically refers to a disposal method for heavy metal adsorption on assembled permeable pavement and an assembled permeable concrete prefabricated board structure. The permeable pavement is composed of a permeable pavement layer (assembled permeable concrete pavement 3), a permeable upper base layer (assembled permeable concrete upper base layer 2), a drainage pipe system (drainage pipe assembly 4) and a permeable lower base layer (impermeable concrete lower base layer 1) from top to bottom. The permeable pavement layer and the permeable upper base layer are treated with a permeable concrete surface modifier, and the raw materials of the modifier include diammonium hydrogen phosphate and water. At the same time, the present invention provides a permeable concrete prefabricated board (permeable concrete prefabricated board 21). Compared with the existing assembled permeable pavement, the present invention aims to solve the problem that traditional permeable pavements are difficult to continuously and effectively capture heavy metal elements contained in rainwater. The method and prefabricated board system provided by the present invention can effectively realize the adsorption of heavy metals in rainwater and improve the mechanical properties of permeable concrete. At the same time, the prefabricated board of the present invention can effectively increase the adsorption area of ​​the modifier and improve the capture efficiency of heavy metal elements in rainwater by the permeable pavement. In addition, the modification method provided by the present invention is convenient, there is no significant safety hazard during the modification process, the prefabricated board is simple to construct, and has good economy and ease of construction.

[0054] Example

[0055] refer to Figure 1-Figure 2The present embodiment provides a prefabricated permeable pavement system with a heavy metal adsorption function, the prefabricated permeable pavement system with a heavy metal adsorption function comprises an impermeable concrete lower base 1, a prefabricated permeable concrete upper base 2 and a prefabricated permeable concrete pavement 3 arranged in sequence from bottom to top, and also comprises a drainage pipe assembly 4 arranged in the impermeable concrete lower base 1; the heavy metal adsorption rate in the prefabricated permeable pavement system with a heavy metal adsorption function is greater than 70%; the prefabricated permeable concrete upper base 2 is a concrete base treated with a prefabricated permeable concrete interface modifier; the prefabricated permeable concrete pavement 3 is a concrete pavement treated with a prefabricated permeable concrete interface modifier.

[0056] The prefabricated permeable concrete interface modifier comprises water and diammonium hydrogen phosphate, wherein the mass fraction of the diammonium hydrogen phosphate is 10%; the pH of the prefabricated permeable concrete interface modifier is adjusted to between 7.6 and 8.5 by a pH regulator.

[0057] The pH regulator is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

[0058] The preparation method of the prefabricated permeable concrete interface modifier comprises gradually adding diammonium hydrogen phosphate into water while stirring and mixing, and then adjusting the pH to 7.6-8.5 to obtain the prepared interface modifier. In the preparation method of the prefabricated permeable concrete interface modifier, it is necessary to gradually add diammonium hydrogen phosphate into water while stirring to ensure that the diammonium hydrogen phosphate is completely dissolved and evenly distributed in the solution.

[0059] The prefabricated permeable concrete upper base 2 includes a permeable concrete prefabricated panel 21 and an assembly component 22; the permeable concrete prefabricated panel 21 and the assembly component 22 are connected. The permeable concrete prefabricated panel 21 is triangular in shape; multiple permeable concrete prefabricated panels 21 are spliced ​​and connected by the assembly component 22; the prefabricated permeable concrete upper base 2 forms a slope with the impermeable concrete lower base 1, optimizes the rainwater flow path, and ensures that the rainwater is quickly discharged from the road surface through the drainage system 2.

[0060] This embodiment further provides a method for modifying an assembled permeable pavement for heavy metal adsorption, which is used to prepare an assembled permeable pavement system with heavy metal adsorption function. The method comprises the following steps:

[0061] (1) Surface cleaning of concrete base and / or concrete pavement;

[0062] (2) After the surface is cleaned, the prefabricated permeable concrete interface modifier is evenly applied to the concrete base and / or the concrete pavement surface to further obtain the prefabricated permeable concrete upper base 2 and / or the prefabricated permeable concrete pavement 3.

[0063] The method specifically comprises the following steps (prefabricated permeable concrete upper base 2):

[0064] Step 1: preparing an assembled permeable concrete interface modifier, wherein the assembled permeable concrete interface modifier is mainly composed of a mixture of water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%;

[0065] When mixing water and diammonium hydrogen phosphate, diammonium hydrogen phosphate should be gradually added while stirring. After complete mixing, the pH should be adjusted to between 7.6-8.5.

[0066] The solution for adjusting pH should be 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0067] Step 2: negative pressure treatment of the permeable concrete precast panel 21, placing the permeable concrete precast panel 21 at 25°C and 133Pa for 24 hours.

[0068] Step 3: Surface treatment of permeable concrete precast panel 21

[0069] Before the permeable concrete precast panel 21 is modified, the panel surface needs to be cleaned with a brush to keep the panel surface clean and free of debris.

[0070] The assembled permeable concrete interface modifier liquid is evenly applied on the permeable concrete prefabricated board 21, and the amount applied each time is 0.054g / cm 2 The treatment is performed 10 times with a treatment interval of 24 hours. The treated multiple permeable concrete prefabricated panels 21 are spliced ​​and connected by assembly components 22 to obtain the assembled permeable concrete upper base 2.

[0071] The method specifically comprises the following steps (assembled permeable concrete pavement 3):

[0072] Step 1: preparing an assembled permeable concrete interface modifier, wherein the assembled permeable concrete interface modifier is mainly composed of a mixture of water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%;

[0073] When mixing water and diammonium hydrogen phosphate, diammonium hydrogen phosphate should be gradually added while stirring. After complete mixing, the pH should be adjusted to between 7.6-8.5.

[0074] The solution for adjusting pH should be 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0075] Step 2: Negative pressure treatment of the concrete pavement, place the concrete pavement at 25℃, 133Pa for 24 hours.

[0076] Step 3: Surface treatment of concrete pavement. Before modifying the concrete pavement, the pavement needs to be cleaned with a brush to keep the pavement surface clean and free of debris.

[0077] Apply the prefabricated permeable concrete interface modifier liquid evenly on the concrete pavement, with the application amount of 0.054g / cm 2 The treatment was performed 10 times with a treatment interval of 24 hours to obtain the assembled permeable concrete pavement 3.

[0078] The assembly of the assembled permeable pavement system with heavy metal adsorption function includes the following process:

[0079] The drainage pipe assembly 4 is arranged in the impermeable concrete lower base 1;

[0080] A plurality of prefabricated permeable concrete panels 21 treated with an assembled permeable concrete interface modifier are spliced ​​and connected by an assembly component 22 to obtain an assembled permeable concrete upper base 2;

[0081] Connect the assembled permeable concrete upper base 2 with the impermeable concrete lower base 1 to form a slope;

[0082] Connecting the assembled permeable concrete pavement 3 to the assembled permeable concrete upper base 2;

[0083] Among them, the impermeable concrete lower base 1, the assembled permeable concrete upper base 2 and the assembled permeable concrete pavement 3 are arranged in sequence from bottom to top.

[0084] The drainage pipe assembly 4 is arranged close to the lower end of the assembled permeable concrete upper base 2.

[0085] In this embodiment, the impermeable concrete lower base layer 1 is a C20 concrete base layer, the total thickness of the impermeable concrete lower base layer 1 is preferably 150 mm, the strength of the permeable concrete prefabricated panel 21 of the prefabricated permeable concrete upper base layer 2 is not less than C25, the total thickness of the prefabricated permeable concrete upper base layer 2 is 100 mm, the assembly component 22 is a conventional prefabricated to panel connecting component, the prefabricated permeable concrete pavement 3 is a concrete base layer with a surface grade not less than C30, and the total thickness of the prefabricated permeable concrete pavement 3 is 180 mm.

[0086] like Figure 3 As shown, the drainage pipe assembly 4 is a rapid drainage mechanism, including a beam pipe 41 installed in the structure of the impermeable concrete lower base 1, vertical pipes 42 evenly distributed in the grooves on the top of the beam pipe, and a filter 43 installed on the beam pipe, and a conventional filter is selected.

[0087] When it rains, surface runoff of rainwater carrying heavy metals passes through the assembled permeable concrete pavement 3, and pollutants and heavy metals are initially filtered; rainwater passes through the assembled permeable concrete upper base 2, and the triangular structure of the assembled permeable concrete upper base 2 is used to re-regulate the flow and rate of rainwater to improve the adsorption efficiency of heavy metals in rainwater; rainwater is quickly discharged from the road structure through the drainage pipe assembly 4 on the impermeable concrete lower base 1.

[0088] Comparison example

[0089] This comparative example provides a permeable pavement system. Compared with the embodiment, this comparative example does not perform surface treatment on the permeable concrete prefabricated panel 21, and other settings are basically the same.

[0090] The pavement systems in the embodiments and comparative examples were simulated. The permeable concrete with surface modification and the permeable concrete without surface modification were simulated in the test room to simulate the adsorption effect of heavy metals. The permeable concrete was directly immersed in a heavy metal solution with 1L of 500mg / L Zn 2+ After soaking in the solution for 4 hours, the specimens were taken out, and then 1L of pure water was used to wash the heavy metal ions that were potentially adhered to the surface of each group of specimens above the beakers where the specimens were soaked, to obtain the residual solution after the reaction of each specimen. The treatment effect of the modified permeable concrete (the assembled permeable pavement system with heavy metal adsorption function of the embodiment, the permeable pavement system of the comparative example) is shown in Table 1 below:

[0091] Table 1 Treatment effects of modified permeable concrete in the embodiments and comparative examples.

[0092] Sample No. Original zinc concentration (mg / L) Zinc concentration after immersion Compressive strength(MPa) 1. Embodiment 500.00 139.72 32.61 2. Comparative Example 500.00 218.91 29.18

[0093] As shown in Table 1, the zinc retention rate of the embodiment is more than 72%, while the zinc retention rate of the control example is only 56%, and the method of the present invention has obvious advantages. In addition, the compressive strength of the embodiment is improved compared with that of the control example.

[0094] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An assembled permeable pavement system with heavy metal adsorption function, characterized in that: The assembled permeable pavement system with heavy metal adsorption function comprises an impermeable concrete lower base (1), an assembled permeable concrete upper base (2) and an assembled permeable concrete pavement (3) which are arranged in sequence from bottom to top; The heavy metal adsorption rate in the assembled permeable pavement system with heavy metal adsorption function is greater than 70%; The prefabricated permeable concrete upper base (2) is a concrete base treated with a prefabricated permeable concrete interface modifier; The assembled permeable concrete pavement (3) is a concrete pavement treated with an assembled permeable concrete interface modifier.

2. The assembled permeable pavement system with heavy metal adsorption function according to claim 1 is characterized in that: The assembled permeable pavement system with heavy metal adsorption function also includes a drainage pipe assembly (4) arranged in the impermeable concrete lower base (1).

3. The assembled permeable pavement system with heavy metal adsorption function according to claim 1 is characterized in that: The prefabricated permeable concrete interface modifier comprises water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%; The pH of the prefabricated permeable concrete interface modifier is adjusted to between 7.6 and 8.5 by a pH regulator.

4. The assembled permeable pavement system with heavy metal adsorption function according to claim 3 is characterized in that: The pH regulator is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

5. The assembled permeable pavement system with heavy metal adsorption function according to claim 3 or 4, characterized in that: The preparation method of the assembled permeable concrete interface modifier comprises the steps of gradually adding diammonium hydrogen phosphate into water while stirring, mixing, and adjusting the pH to 7.6-8.

5.

6. The assembled permeable pavement system with heavy metal adsorption function according to claim 1 is characterized in that: The assembled permeable concrete upper base (2) comprises a permeable concrete prefabricated board (21) and an assembly component (22); The permeable concrete prefabricated panel (21) and the assembly component (22) are connected.

7. The assembled permeable pavement system with heavy metal adsorption function according to claim 6 is characterized in that: The permeable concrete prefabricated panel (21) is in the shape of a triangle; A plurality of permeable concrete prefabricated panels (21) are spliced ​​and connected via assembly components (22); The assembled permeable concrete upper base (2) and the impermeable concrete lower base (1) form a slope.

8. A method for modifying an assembled permeable pavement for heavy metal adsorption in an assembled permeable pavement system with heavy metal adsorption function as claimed in any one of claims 1 to 7, characterized in that: The modification method comprises the following steps: (1) Surface cleaning of concrete base and / or concrete pavement; (2) The prefabricated permeable concrete interface modifier is evenly applied to the concrete base layer and / or the concrete pavement surface to obtain the prefabricated permeable concrete upper base layer (2) and / or the prefabricated permeable concrete pavement (3).

9. The method for modifying a prefabricated permeable road surface for heavy metal adsorption according to claim 8, characterized in that: The process of uniform application is as follows: the amount of each application is 0.054g / cm 2 , treatment times 10 times, treatment interval 24h.

10. The method for modifying a prefabricated permeable road surface for heavy metal adsorption according to claim 8, characterized in that: The prefabricated permeable concrete upper base (2) and / or the prefabricated permeable concrete pavement (3) obtained in step (2) are used to assemble the prefabricated permeable pavement system having the heavy metal adsorption function.

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