CN116514494B

CN116514494B - Permeable concrete and landscape pavement construction method

Info

Publication number: CN116514494B
Application number: CN202310806443.9A
Authority: CN
Inventors: 王理忠
Original assignee: Beijing Orangestone Hardscape Co ltd
Current assignee: Beijing Orangestone Hardscape Co ltd
Priority date: 2023-07-04
Filing date: 2023-07-04
Publication date: 2023-09-15
Anticipated expiration: 2043-07-04
Also published as: CN116514494A

Abstract

The invention relates to permeable concrete, which comprises the following raw materials in parts by mass: 100-160 parts of cement, 380-500 parts of mixed aggregate, 30-40 parts of mixed fiber, 1-1.6 parts of water reducer, 0.4-0.8 part of air entraining agent, 20-30 parts of waterborne epoxy resin, 6-10 parts of organic hydrazide curing agent, 1-3 parts of imidazole curing accelerator and 50-70 parts of water; the mixed fiber is formed by compounding carboxyl modified polypropylene fibers and basalt fibers. The permeable concrete provided by the invention is prepared by mixing coarse aggregate with medium aggregate in specific grain size grading, mixing fiber, and mixing high-epoxy-value epoxy resin with a specific kind of curing agent and curing accelerator, so that the permeable concrete is high in strength, not easy to block, and capable of being cured and molded at a lower temperature, and the water permeability and strength are both considered.

Description

Permeable concrete and landscape pavement construction method

Technical Field

The invention belongs to the technical field of building and construction materials, and particularly relates to the field of concrete, in particular to permeable concrete and a landscape pavement construction method.

Background

The pervious concrete is porous lightweight concrete, which is called porous concrete or non-sand concrete, and is formed by mixing aggregate, cement, resin, water and an auxiliary agent. The honeycomb structure with uniformly distributed holes is formed by coating a thin layer of slurry on the surface of coarse aggregate, so that the honeycomb structure has the characteristics of ventilation, water permeability and light weight. The pavement is often used for scenic spot pavements, park squares and the like, and beautiful permeable pavements are required.

CN114394788A discloses a special permeable concrete for permeable bricks and permeable bricks prepared by using the concrete, belonging to the field of concrete. The raw materials comprise cement, water, broken stone, filling materials, defoamer and cementing agent, wherein the cementing agent comprises the following raw materials: epoxy resins, polytrimethylene carbonate, diacetone acrylamide, hydroxypropyl acrylate. The preparation method comprises the following steps: 1) Mixing the broken stone, the cementing agent and the defoaming agent uniformly, and then mixing and stirring cement, filling material and water; 2) Spreading the mixture in a mould, and placing the mould in a pressing machine for vibration pressing to obtain a semi-finished product of the water permeable brick; 3) And placing the semi-finished product of the water permeable brick in a curing room for standing and curing for 6 to 8 days, and then removing the die and carrying out humidification and curing for 21 to 28 days to obtain the water permeable brick. The water permeable brick has higher mechanical strength, stronger water permeability and better durability.

However, on one hand, the rolling mill is not easy to deform due to the mechanical strength when being rolled by the heavy objects; on the other hand, along with the flushing of rainwater and the long-term falling of ash layers in the air, the pores of the permeable concrete pavement are easily blocked, so that the advantage of water permeability and air permeability of the permeable concrete pavement is lost.

The permeable concrete has a large number of communicated gaps, so that the permeable and breathable properties of the concrete are provided, but the defect of insufficient mechanical strength is brought. The prior art has the principle that the strength of the pervious concrete is increased by adding silica fume, and the principle is that the active ingredients in the silica fume and cement are subjected to hydration reaction to generate C-S-H gel, and the fine gaps of coarse aggregate are filled, so that the mechanical strength and the freeze-thawing resistance of the pervious concrete are improved. Such as described in patent CN113880522a, CN116217263 a. However, on one hand, the construction condition of the silica fume is harsh, the dosage ratio must be controlled accurately, otherwise, the concrete gap is blocked, the advantage of water and air permeability is lost, and no matter how finely the construction condition and the dosage are regulated, the water and air permeability of the concrete is lost. CN114873942a discloses a pervious concrete, using early strength agent, said early strength agent includes 15-20% of monocalcium aluminate, 0.5-1% of diethanol monoisopropanolamine and 79-84.5% of ettringite accelerator. The technology of the patent is similar to that of the technology of adopting silica fume, so that the hydration of calcium silicate salt in cement is promoted, gel is formed, and the strength is improved. However, there is also a disadvantage in that the water permeability and air permeability of the water-permeable concrete are reduced. Therefore, how to improve the mechanical strength of the pervious concrete is a problem to be solved while the pervious performance of the pervious concrete is not affected.

Disclosure of Invention

In order to solve the defect that the mechanical strength and the water permeability and the air permeability of the pervious concrete are difficult to be compatible in the prior art, the pervious concrete provided by the invention is high in strength, not easy to block and capable of being cured and molded at a lower temperature by matching the epoxy resin with a high epoxy value, the curing agent and the curing accelerator of a specific type with the mixed aggregate of the coarse aggregate and the medium aggregate with the specific grain size grading.

The invention achieves the above object by the following technical scheme.

The invention provides permeable concrete, which comprises the following raw materials in parts by mass: 100-160 parts of cement, 380-500 parts of mixed aggregate, 30-40 parts of mixed fiber, 1-1.6 parts of water reducer, 0.4-0.8 part of air entraining agent, 20-30 parts of waterborne epoxy resin, 6-10 parts of organic hydrazide curing agent, 1-3 parts of imidazole curing accelerator and 50-70 parts of water; the mixed fiber is formed by compounding carboxyl modified polypropylene fibers and basalt fibers; the mixed aggregate consists of medium aggregate with the average particle size of 3-5mm and coarse aggregate with the average particle size of 5-10mm, and the weight ratio of the medium aggregate to the coarse aggregate is 1:2.2-2.7.

Further, the weight ratio of the carboxyl modified polypropylene fiber to the basalt fiber is 2-3:1. the carboxyl modified polypropylene fiber has high strength and good compatibility with resin, and basalt fibers can be dispersed and lapped to form a net structure, so that the carboxyl modified polypropylene fiber has a certain constraint effect on the sliding of aggregate. Meanwhile, the addition of the fiber also improves the high-low temperature cracking resistance of the concrete. Basalt fibers and cement slurry have good wettability, so that basalt fibers are uniformly dispersed in the slurry, and strength defects caused by uneven fiber dispersion are reduced.

Further, the carboxyl modified polypropylene fiber is obtained by soaking the polypropylene fiber in hot alkaline solution with pH of 10-11 under stirring, taking out, washing with clear water, soaking in dilute hydrochloric acid, taking out, and washing with water to neutrality. Further, the solute in the alkaline solution is hydroxide and/or carbonate of alkali metal and/or alkaline earth metal, such as NaOH, KOH, na ₂ CO ₃ 、K ₂ CO ₃ The method comprises the steps of carrying out a first treatment on the surface of the The hot alkaline solution is soaked by heating the alkaline solution to 60-80 ℃ for 3-5 hours; the concentration of the dilute hydrochloric acid is 0.05-0.1 mol/L, and the soaking time in the dilute hydrochloric acid is 15-30min. The polyacrylonitrile fiber is soaked and hydrolyzed in the hot alkaline solution and then is pickled,and obtaining the polyacrylonitrile fiber with the surface rich in carboxyl. The carboxyl group will react with the epoxy group on the one hand and enhance the hydrophilicity of the polyacrylonitrile on the other hand. The two components act together to improve the strength and water storage property of the pervious concrete. The polypropylene fiber is 10-19mm, preferably 12-15mm, and may be KLW-02JBX manufactured by Shenzhen Hengyuda building materials Co., ltd. The length of basalt fiber is 6-10mm, the diameter is 13-17 mu m, and the compressive strength is more than or equal to 1200MPa.

Further, in the mixed aggregate, the medium aggregate is natural sand, such as river sand, sea sand, valley sand and the like; the coarse aggregate is porous ceramic particles. Further, the coarse aggregate porous ceramsite is treated by an epoxy silane coupling agent and an amino silane coupling agent. The porous ceramsite is used as coarse aggregate, and the porous structure of the aggregate can bring light weight and better water permeability and air permeability to the concrete, but the strength is reduced. The porous ceramsite is immersed in the compounded silane coupling agent dispersion liquid, rich epoxy groups and amino groups are formed on the surface of the porous ceramic, the porous ceramsite can be connected with epoxy resin and carboxyl modified polyacrylonitrile fibers, and the strength of the pervious concrete is further enhanced when the water permeability and the air permeability are not affected.

Still further, the epoxy silane coupling agent is selected from at least one of KH-540, KH-550 and KH-792, and the amino silane coupling agent is selected from at least one of KH-560, KH-561, KH-563 and KH-564; the porous ceramsite is immersed in an alcohol water solution of the epoxy silane coupling agent and the amino silane coupling agent for 1-2h, wherein the concentration of the epoxy silane coupling agent is 0.1-0.15mol/L, and the concentration of the amino silane coupling agent is 0.05-0.07mol/L; the alcohol aqueous solution is an alcohol aqueous solution of ethanol and water according to the volume of 6-8:1-2. During impregnation, the porous ceramsite can be completely immersed by using the alcohol water solution. In order to ensure the quality, the porous ceramsite is generally impregnated with the silane coupling agent 1-2 days before construction, otherwise, the porous ceramsite is stored for a long time after impregnation, and the silane coupling agent cannot effectively play a role.

Further, porous ceramicsThe grain diameter is 5-10mm, the porosity is 30-40%, the specific surface area is 40-60 m ² And/g, the compressive strength is 10-15MPa.

Preferably, the cements used in the present invention are high strength portland cements having strength grades of 52.5-62.5 MPa. For example, available from Shandong Kangjing New Material technologies Co.

The water reducer is a liquid polycarboxylate water reducer, the water reducing rate is 26-30%, and the solid content is 30-40%. Such as Gao Hong and GH type high-efficiency liquid polycarboxylate water reducer of wet construction materials limited company. The air entraining agent is not particularly limited, and is conventional in the art, and the air entraining amount of the air entraining agent is 200-300 mL/g.

In the construction field, latent curing agents such as dicyandiamide are generally used, but dicyandiamide has a high curing temperature of about 100 ℃ even under the action of a curing accelerator. The invention uses organic hydrazide curing agent, the curing temperature is lower than dicyandiamide. The organic hydrazide curing agent is selected from succinic acid hydrazide, adipic acid dihydrazide, sebacic acid hydrazide and isophthalic acid hydrazide.

Further, the imidazole curing accelerator is short-chain alkyl imidazole and long-chain alkyl imidazoline according to the mass ratio of 4-6:1, compounding; the short-chain alkyl imidazole is selected from 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-ethylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole and 2-phenyl-4, 5-dimethylol imidazole; the long-chain alkyl imidazole is selected from undecyl imidazoline, dodecyl imidazoline, tridecyl imidazoline, tetradecyl imidazoline, pentadecyl imidazoline, heptadecyl imidazoline and oleic hydroxyethyl imidazoline; oleic hydroxyethyl imidazoline is preferred. Because the pervious concrete is cured under the moisture condition, the inventor does not expect to find an imidazole curing accelerator compounded by conventional short-chain alkyl imidazole and oleic hydroxyethyl imidazoline, and the strength and the curing efficiency of the pervious concrete can be taken into consideration under the conventional concrete curing condition.

The epoxy equivalent of the aqueous epoxy resin is 450-550 g/eq, and the solid content is 50-60%. Such as H-502-42W of diegasan DIC.

The invention also provides a preparation method of the pervious concrete, which comprises the following steps:

cement, basalt fiber, water-based epoxy resin and water are added into the mixer according to the mass ratio, and the mixture is uniformly mixed; and then adding the water reducer, the air entraining agent, the carboxyl modified acrylonitrile fiber and the mixed aggregate, and finally adding the curing agent and the curing accelerator, and uniformly stirring to obtain the pervious concrete.

Basalt fibers are added earlier, while carboxy-modified acrylonitrile fibers are added last with aggregate. The applicant found that adding the mixed fibres in the above order is more advantageous for the strength of the pervious concrete.

The permeable concrete is cast in situ or poured into a mold when in use. In a preferred technical scheme of the invention, the permeable concrete brick is obtained by pouring the permeable concrete brick into a brick type mould and curing. The curing is a mode of combining the current standard curing and the water spraying cover film curing, the curing time is 40-60h, such as 48h, and then demoulding treatment is carried out, so that the obtained preformed permeable concrete brick is cured for 28 days under the conditions that the temperature is 25+/-2 ℃ and the humidity is more than or equal to 90 and RH%, and the permeable concrete brick is obtained.

The invention also provides a construction method of the permeable landscape pavement, which comprises the following steps:

(S1) manufacturing the pervious concrete into pervious concrete bricks in a mould, paving the pervious concrete bricks on a pavement, and leaving a gap of 1-2cm between the pervious concrete bricks;

(S2) filling gap filling permeable concrete into gaps of the permeable concrete bricks; the joint filling permeable concrete comprises the following raw materials in parts by mass: 100-140 parts of cement, 40-60 parts of asphalt, 220-280 parts of multi-stage aggregate, 50-70 parts of fiber, 1-1.6 parts of water reducer, 20-30 parts of viscoelastic body and 50-70 parts of water.

And (S3) vibrating and rolling the pavement by adopting a flat vibrator, and then spraying water to cover the membrane for maintenance.

Further, in the joint filling water permeable concrete, the multistage aggregate consists of fine aggregate with an average particle size of 1-3mm, middle aggregate with an average particle size of >3-5mm (i.e. more than 3mm and less than or equal to 5 mm) and coarse aggregate with an average particle size of >5-10mm (i.e. more than 5mm and less than or equal to 10 mm), wherein the weight ratio of the fine aggregate to the middle aggregate to the coarse aggregate is 1:1-3:1-3; the adhesive viscoelastic body consists of polyisobutene and SBS resin, wherein the weight ratio of the polyisobutene to the SBS resin is 1-3:1-3; in the formulation of joint-filled water-permeable concrete, cement, fiber and water reducing agent are well known in the art. Preferably, in the joint filling pervious concrete formula, the types of cement, mixed fiber and water reducing agent are the same as those of pervious concrete.

The constructed pavement can be constructed on the pavement with the requirements of water permeability and air permeability such as ditches, landscapes, parks and the like, has high strength, good water permeability and air permeability, and meets the design requirements and concepts of the prior sponge city. The ditch can be an artificial ditch, for example, fig. 1 is a schematic view pavement diagram of construction by adopting permeable concrete bricks and caulking permeable concrete, a support frame and a net frame are erected on the ditch, stones with different sizes are paved on the net frame, permeable concrete bricks are paved on a stone layer, gaps between the permeable concrete bricks are 1-2mm, the filled caulking concrete has low viscosity and good fluidity, and the permeable concrete bricks are poured in the gaps of the permeable concrete bricks and are simultaneously infiltrated into the stone layer, so that the stone layer and the permeable concrete bricks are bonded into a whole.

The method for combining the permeable concrete brick with the joint filling permeable concrete has the advantages of high elasticity, high fluidity and high cohesiveness compared with the concrete used for the permeable concrete brick. By means of the combination of the two,

further, the joint filling water permeable concrete is prepared by a preparation method comprising the following steps: and (3) uniformly mixing asphalt and the adhesive viscoelastic body under the heating condition, continuously adding cement, fiber, water and a water reducing agent, and uniformly mixing to obtain the joint filling water-permeable concrete.

The joint filling pervious concrete has higher cement content, smaller aggregate size and better fluidity than pervious concrete bricks, so that the joint filling pervious concrete fills gaps of the concrete bricks and can bond the concrete bricks and mixed aggregates of the concrete bricks and the lower layers well. By adopting the structure, the overall strength of the permeable pavement is obviously enhanced, and the strength of the permeable pavement, the strength of the pavement and the combination firmness between the permeable concrete layer and the mixed bone material layer are considered.

Drawings

FIG. 1 is a schematic view of a landscape pavement constructed with pervious concrete bricks and joint filling pervious concrete.

Detailed Description

The raw materials used in the embodiment of the invention are purchased from conventional commercial sources, and the concrete testing method is a conventional method in the field.

In the embodiments of the present invention, the "parts" are parts by mass unless otherwise specified, and the "%" are percentages by mass unless otherwise specified.

The polyacrylonitrile fiber was purchased from KLW-02JBX, 12-15mm in length, manufactured by Shenzhen Hengyuda building materials Co., ltd.

Basalt fiber is purchased from Jiashuo building materials processing Co., ltd, and has a length of 6-10mm, a diameter of 13-17 μm and a compressive strength of not less than 1000MPa.

Portland cement was purchased from Shandong Kangjingzhi New Material technologies Co., ltd and has a strength of 62.5MPa.

The polycarboxylate water reducer is purchased from Gao Hong and building materials, inc., GH type, liquid, solid content 36% and water reducing rate 30%.

The air entraining agent was purchased from Hebei Yida cellulose limited, model FPJ31, air generating amount 230 mL/g.

Porous ceramsite is purchased from Henan Hende Hendel renewable resource optimization company, has particle size of 5-10mm, porosity of 35%, and specific surface area of 42.6 m ² And/g, compressive strength of 12.5MPa.

The waterborne epoxy resin is purchased from DIYISON DIC, the brand number is H-502-42W, the epoxy equivalent is 460 g/eq, and the solid content is 52%.

Preparation example 1

And (3) putting the polyacrylonitrile fiber into 10 times of NaOH solution with the pH value of 10, heating to 70 ℃, soaking for 2 hours under the stirring condition of 200rpm, taking out the polyacrylonitrile fiber, washing, putting into 0.05mol/L dilute hydrochloric acid, soaking for 15 minutes, taking out, washing to be neutral, and thus obtaining the carboxyl modified polyacrylonitrile fiber.

Example 1

(1) Immersing the porous ceramsite in an ethanol water solution (volume ratio of ethanol: water=8:2) in which 0.1mol/L KH-540 and 0.05mol/L KH-560 are dispersed for 2 hours, taking out and drying to obtain the porous ceramsite treated by the silane coupling agent for later use.

(2) Adding 100 parts of cement, 10 parts of basalt fiber, 20 parts of water-based epoxy resin H-502-42W and 60 parts of water into a forced mixer, and uniformly stirring; then, 1.3 parts of liquid polycarboxylate water reducer, 0.6 part of air entraining agent FPJ31 and 30 parts of carboxyl modified polyacrylonitrile fiber prepared in preparation example 1 are mixed into 400 parts of aggregate, wherein the mixed aggregate is river sand with the particle size of 3-5mm and porous ceramsite treated by the silane coupling agent obtained in step (1) according to the mass ratio of 1:2.2, finally adding 6 parts of succinic acid hydrazide curing agent and 2 parts of curing agent, wherein the curing agent is a compound of 2-ethyl-4-methylimidazole and oleic acid hydroxyethyl imidazoline according to a mass ratio of 4:1, and the size of a mould is 100mm multiplied by 100mm, and uniformly mixing and stirring to obtain the pervious concrete slurry.

(3) Pouring the pervious concrete slurry in a brick type mould, sprinkling a water cover film, curing for 48 hours at normal temperature and humidity of 90 RH%, and demoulding to obtain the preformed pervious concrete brick.

(4) 100 parts of cement, 50 parts of asphalt, 250 parts of multistage compound aggregate (fine aggregate with the particle size of 1-3mm, aggregate with the particle size of more than 3-5mm, coarse aggregate with the particle size of more than 5-10mm, and formed by grading according to the mass ratio of 1:2:1), 50 parts of fiber (compounding of acrylonitrile fiber and basalt fiber according to the mass ratio of 3:1), 1.3 parts of liquid polycarboxylate water reducer, 20 parts of viscoelastic body (compounding of polyisobutylene and SBS resin according to the mass ratio of 1:1) and 60 parts of water are added into a forced mixer, and uniformly mixed and stirred to obtain the joint filling concrete slurry.

(5) Paving preformed permeable concrete bricks on the roadbed, leaving a gap of 1cm between the preformed permeable concrete bricks, filling joint filling concrete slurry in the gap, vibrating and rolling the pavement by a flat vibrator, spraying water, coating a film, curing for 28 days, and finally spraying permeable concrete sealant.

Example 2

Other conditions and operations were the same as in example 1 except that step (1) was omitted, i.e., porous ceramsite was directly used without soaking in the silane coupling agent dispersion.

Example 3

Other conditions and operations are the same as in example 1 except that in step (2), the curing accelerator is a compound of 2-ethyl-4-methylimidazole and heptadecylimidazoline in a mass ratio of 4:1.

Example 4

Other conditions and operations were the same as in example 1 except that in step (2), the curing accelerator was 2-ethyl-4-methylimidazole.

Example 5

Other conditions and operations were the same as in example 1 except that in step (2), the curing accelerator was oleic hydroxyethyl imidazoline.

Example 6

Other conditions and operations are the same as in example 1 except that in step (2), the curing agent is isophthalic acid hydrazide, and the curing accelerator is a compound of 1-cyanoethyl-2-ethyl-4-methylimidazole and oleic hydroxyethyl imidazoline according to a mass ratio of 6:1.

Comparative example 1

Other conditions and operations were the same as in example 1 except that in step (2), the carboxyl group-modified polyacrylonitrile fiber obtained in preparation example 1 was replaced with a directly commercially available polypropylene fiber.

Effect example

The performance tests were carried out on the pervious concretes of examples 1 to 6 of the present invention, and the pervious concretes of comparative example 1, and the caulking concretes of step (4) of example 1 (all of the examples and comparative examples were the caulking concretes of example 1), and the results are shown in the following Table 1:

wherein the freezing resistance is the retention rate of compressive strength after 100 freeze thawing cycles. The compressive strength retention is calculated as the compressive strength after a freeze-thaw cycle divided by the initial compressive strength.

The resistance to temperature denaturation was measured for compressive strength retention at 105℃C 12h and 25℃C 12h, with 40 cycles.

Table 1 concrete performance test

As can be seen from the data in Table 1, the pervious concrete has excellent comprehensive performance, the pervious performance and the mechanical strength are both considered, and the pervious concrete has excellent freezing resistance and temperature resistance, and can meet the requirements of 'sponge city' on various pavements requiring the pervious and breathable performances.

Claims

1. The pervious concrete is characterized by comprising the following raw materials in parts by mass: 100-160 parts of cement, 380-500 parts of mixed aggregate, 30-40 parts of mixed fiber, 1-1.6 parts of water reducer, 0.4-0.8 part of air entraining agent, 20-30 parts of waterborne epoxy resin, 6-10 parts of organic hydrazide curing agent, 1-3 parts of imidazole curing accelerator and 50-70 parts of water; the mixed fiber is formed by compounding carboxyl modified polypropylene fibers and basalt fibers; the mixed aggregate consists of medium aggregate with the average particle size of more than 3mm and less than or equal to 5mm and coarse aggregate with the average particle size of more than 5mm and less than or equal to 10mm, and the weight ratio of the medium aggregate to the coarse aggregate is 1:2.2-2.7;

the carboxyl modified polypropylene fiber is prepared by soaking polypropylene fiber in hot alkaline solution with pH of 10-11 under stirring, taking out, washing with clear water, soaking in dilute hydrochloric acid, taking out, and washing with water to neutrality;

the coarse aggregate porous ceramsite is treated by an epoxy silane coupling agent and an amino silane coupling agent;

the imidazole curing accelerator is short-chain alkyl imidazole and long-chain alkyl imidazoline according to the mass ratio of 4-6:1, compounding; the short-chain alkyl imidazole is selected from 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-ethylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole and 2-phenyl-4, 5-dimethylol imidazole; the long-chain alkyl imidazole is selected from undecyl imidazoline, dodecyl imidazoline, tridecyl imidazoline, tetradecyl imidazoline, pentadecyl imidazoline, heptadecyl imidazoline and oleic hydroxyethyl imidazoline.

2. The pervious concrete according to claim 1, wherein the weight ratio of carboxyl modified polypropylene fibers to basalt fibers is 2-3:1.

3. the pervious concrete according to claim 1, wherein the solute in the alkaline solution is an alkali metal and/or alkaline earth metal hydroxide and/or carbonate; the hot alkaline solution is soaked by heating the alkaline solution to 60-80 ℃ for 3-5 hours; the concentration of the dilute hydrochloric acid is 0.05-0.1 mol/L, and the soaking time in the dilute hydrochloric acid is 15-30min; the polypropylene fiber is 10-19mm specification fiber.

4. The pervious concrete according to claim 1, wherein the medium aggregate is river sand, sea sand or valley sand; the coarse aggregate is porous ceramic particles.

5. The pervious concrete according to claim 1, wherein the epoxy silane coupling agent is at least one selected from the group consisting of KH-540, KH-550, KH-792, and the aminosilane coupling agent is at least one selected from the group consisting of KH-560, KH-561, KH-563, KH-564; the porous ceramsite is immersed in an alcohol water solution of the epoxy silane coupling agent and the amino silane coupling agent for 1-2h, wherein the concentration of the epoxy silane coupling agent is 0.1-0.15mol/L, and the concentration of the amino silane coupling agent is 0.05-0.07mol/L; and/or

The particle size of the porous ceramsite is 5-10mm, the porosity is 30-40%, the specific surface area is 40-60 m ² And/g, the compressive strength is 10-15MPa.

6. The pervious concrete of claim 1, wherein the cement is portland cement having a strength grade of 52.5-62.5 MPa; the water reducer is a liquid polycarboxylate water reducer, the water reducing rate is 26-30%, and the solid content is 30-40%; the epoxy equivalent of the aqueous epoxy resin is 450-550 g/eq, and the solid content is 50-60%; the organic hydrazide curing agent is selected from succinic acid hydrazide, adipic acid dihydrazide, sebacic acid hydrazide and isophthalic acid hydrazide.

7. The construction method of the permeable landscape pavement is characterized by comprising the following steps of:

(S1) forming the permeable concrete according to any one of claims 1 to 6 into permeable concrete bricks in a mold, and paving the permeable concrete bricks on a road surface with a gap of 1 to 2cm left between the permeable concrete bricks;

(S2) filling gap filling permeable concrete into gaps of the permeable concrete bricks; the joint filling permeable concrete comprises the following raw materials in parts by mass: 100-140 parts of cement, 40-60 parts of asphalt, 220-280 parts of multi-stage aggregate, 50-70 parts of fiber, 1-1.6 parts of water reducer, 20-30 parts of viscoelastic body and 50-70 parts of water;

8. The construction method of the permeable landscape pavement according to claim 7, wherein in the joint filling permeable concrete, the multistage aggregate consists of fine aggregate with an average particle size of 1-3mm, medium aggregate with an average particle size of more than 3mm and less than or equal to 5mm and coarse aggregate with an average particle size of more than 5mm and less than or equal to 10 mm; wherein, the weight ratio of the fine aggregate to the medium aggregate to the coarse aggregate is 1:1-3:1-3; the adhesive viscoelastic body consists of polyisobutene and SBS resin, wherein the weight ratio of the polyisobutene to the SBS resin is 1-3:1-3.