Water-retaining pervious concrete pavement material and method for preparing the same

Abstract

The application relates to the technical field of building materials, in particular to a water-retaining type water-permeable concrete pavement material and a preparation method thereof. The water-retaining type water-permeable concrete pavement material comprises base layer water-retaining type concrete and surface layer elastic anti-cracking water-permeable concrete, raw materials of the base layer water-retaining type concrete include cement, steel slag coarse aggregate, bottom slag aggregate, lignin fiber and water, and raw materials of the surface layer elastic anti-cracking water-permeable concrete include cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent and water. The material is used for water-permeable road construction, improves road walking comfort and relieves urban heat island effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a water-retaining type pervious concrete pavement material and a preparation method thereof. BACKGROUND

[0002] The sponge city is also called "low impact development rainwater system construction", which has the functions of "seepage, lag, purification, storage, use and drainage". As an ideal material for sponge city construction, the existing pervious concrete basically realizes the functions of water permeation and drainage through internal pores, but there are few reports on water lag and storage. Some designers set internal water storage cavities and water storage pools to achieve water storage, but the effect is not good or difficult to be practically applied. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a water-retaining type pervious concrete pavement material and a preparation method thereof, which can utilize steel slag, furnace bottom slag and waste rubber to prepare a double-layer composite pervious concrete with water-retaining function, so as to be used for pervious road construction, improve road walking comfort and relieve urban heat island effect.

[0004] To achieve the above-mentioned purposes and other related purposes, one aspect of the present application provides a water-retaining type pervious concrete pavement material, which comprises a base layer water-retaining type concrete and a surface layer elastic anti-cracking pervious concrete. The raw materials of the base layer water-retaining type concrete include cement, steel slag coarse aggregate, furnace bottom slag aggregate, lignin fiber and water. The raw materials of the surface layer elastic anti-cracking pervious concrete include cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent and water.

[0005] The second aspect of the present application provides a preparation method of the water-retaining type pervious concrete pavement material, which comprises:

[0006] 1) mixing and stirring the steel slag coarse aggregate, a part of the cement and a part of the water, then adding the remaining part of the cement and the remaining water to stir to a dry-hard state, and then adding the pre-wetted furnace bottom slag aggregate and lignocellulose to obtain the base layer water-retaining type concrete;

[0007] 2) mixing and stirring the rubber emulsion and the water reducing agent in water to obtain a uniform solution A, then stirring the cement, the steel slag sand and the rubber particles in the solution A to obtain the surface layer elastic anti-cracking pervious concrete.

[0008] The third aspect of the present application provides the use of the water-retaining type pervious concrete pavement material of the first aspect of the present application in the preparation of a water-retaining type pervious concrete pavement.

[0009] The fourth aspect of the present application provides a water-retaining type pervious concrete pavement, which is paved by the water-retaining type pervious concrete pavement material of the first aspect of the present application.

[0010] The water-retaining type water-permeable concrete pavement material and the preparation method thereof have the following advantages:

[0011] (1) The steel slag, the bottom slag and the waste rubber particles are used as solid wastes of metallurgical, electric power and chemical industries to prepare the water-permeable water-retaining type concrete, which realizes the collaborative treatment of the solid wastes, saves the natural resources such as river sand and gravel, and contributes to the construction of the "sponge city" and the "waste-free city".

[0012] (2) The bottom slag has the characteristics of low specific gravity (1.8-2.6 g / cm 3 ) and high water absorption rate (8-10%), and the lignin fiber can play the roles of water retention and crack resistance when added into the concrete. The water-permeable concrete prepared by taking the steel slag as the main aggregate and the bottom slag and the lignin fiber as the fillers can fully exert the water absorption and water retention characteristics of the bottom slag and the lignin fiber, and realize the synergy and the combination of rigidity and flexibility of the three, thereby improving the crack resistance of the water-permeable concrete.

[0013] (3) The steel slag sand and the waste rubber particles are used as the aggregate, and the carboxyl styrene butadiene latex is added to modify and prepare the concrete. The rubber particles as the elastic particles in the concrete can improve the internal pore structure of the concrete and effectively absorb the vibration, thereby having the functions of vibration reduction and noise reduction. The steel slag and the waste rubber can be turned into treasure, and the pavement can realize the functions of vibration reduction, noise reduction and elastic crack resistance, thereby improving the passing comfort of the pavement. DETAILED DESCRIPTION

[0014] The inventor of the present application provides a water-retaining type water-permeable concrete pavement material through a large number of exploration experiments. The water-retaining type base concrete is prepared by taking the steel slag coarse aggregate (for example, 5-15 mm) and the bottom slag fine aggregate (for example, 0-3 mm) as the aggregate. The elastic surface layer concrete is prepared by taking the steel slag fine aggregate (for example, 1-3 mm) and the waste rubber particles. The composite double-layer water-permeable concrete structure is formed. The present application uses the steel slag, the bottom slag and the waste rubber to collaboratively prepare a water-retaining type water-permeable concrete. On the one hand, the solid wastes can be consumed and turned into treasure. On the other hand, the water-retaining type elastic crack-resistant water-permeable concrete structure is developed on the basis of the traditional water-permeable concrete, which can be widely used in the water-permeable pavement engineering of sidewalks, squares and landscape paths. The present application has a positive significance for saving the sand and stone materials and contributing to the construction of the "waste-free city" and the "sponge city". The present application is completed on the basis.

[0015] Water-retaining pervious concrete pavement material

[0016] The present application provides a water-retaining type water-permeable concrete pavement material, which includes the base water-retaining type concrete and the surface elastic crack-resistant water-permeable concrete. On the one hand, the function of the steel slag water-permeable concrete is upgraded. On the other hand, the multiple solid wastes can be collaboratively consumed and turned into treasure.

[0017] The thickness ratio of the base water-retaining concrete and the surface layer elastic anti-cracking water-permeable concrete in the water-retaining water-permeable concrete pavement material provided by the application is (1-3):(7-9). Alternatively, the thickness ratio of the base water-retaining concrete and the surface layer elastic anti-cracking water-permeable concrete may be (1-2):(8-9), (2-3):(7-8), or the like.

[0018] The raw materials of the base water-retaining concrete in the water-retaining water-permeable concrete pavement material provided by the application include cement, steel slag coarse aggregate, bottom ash aggregate, lignin fiber, and water, wherein the weight ratio of the cement, steel slag coarse aggregate, bottom ash aggregate, lignin fiber, and water is 1:(4.5-5.5):(0.9-1.2):0.04:0.35.

[0019] In the base water-retaining concrete, the cement is PO 42.5 ordinary portland cement, provided by Taicang Conch Cement Co., Ltd.

[0020] In the base water-retaining concrete, the steel slag coarse aggregate is 5-15 mm, provided by Shanghai Metallurgical Environmental Engineering Technology Co., Ltd., and the f.cao (free calcium) content should be <3%, preferably zero, and the MFe content should be ≤1%, preferably zero.

[0021] In the base water-retaining concrete, the particle size of the bottom ash aggregate is 0-3 mm, obtained by screening fine sand-like boiler bottom ash from a power plant, and the main components are SiO2 and Al2O3. Alternatively, the particle size of the bottom ash aggregate is 0.1-3 mm, 0-1 mm, 1-2 mm, or 2-3 mm, or the like.

[0022] In the base water-retaining concrete, the lignin fiber is industrial-grade lignocellulose, white and flocculent, provided by Taian Anfeng New Material Technology Co., Ltd.

[0023] In the base water-retaining concrete, the water is industrial tap water, which meets the JGJ 63 standard for concrete mixing water.

[0024] The raw materials of the surface layer elastic anti-cracking water-permeable concrete in the water-retaining water-permeable concrete pavement material provided by the application include cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent, and water. The weight ratio of the cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent, and water is 1:(3.5-4.5):(0.15-0.45):(0.05-0.1):(0.02-0.05):0.3.

[0025] In the surface layer elastic anti-cracking water-permeable concrete, the cement is PO 42.5 ordinary portland cement, provided by Taicang Conch Cement Co., Ltd.

[0026] In the surface layer elastic anti-cracking water permeable concrete, the particle size of the steel slag sand is 1-3 mm, which can be selected as 1-2 mm or 2-3 mm, etc. Shanghai Metallurgical Environmental Engineering Technology Co., Ltd. provides that the f.cao (free calcium) content should be <3%, and the f.cao (free calcium) content is preferably zero; the MFe content should be ≤1%; and the MFe content is preferably zero.

[0027] In the surface layer elastic anti-cracking water permeable concrete, the rubber particles are 30-50 mesh, which can be selected as 30-40 mesh or 40-50 mesh, and are obtained by crushing waste automobile and truck tires.

[0028] In the surface layer elastic anti-cracking water permeable concrete, the rubber emulsion is a carboxyl styrene latex with a solid content of 50-52%, a viscosity of 35-150 mPa.s at 25°C, and is provided by Jining Tangyi Chemical Co., Ltd.

[0029] In the surface layer elastic anti-cracking water permeable concrete, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, which is provided by Suzhou Yisite Building Material Technology Co., Ltd.

[0030] In the surface layer elastic anti-cracking water permeable concrete, the water is industrial tap water, which meets the JGJ 63 standard for water for mixing concrete.

[0031] Method for producing water-retaining pervious concrete pavement material

[0032] The second aspect of the present application provides a preparation method of water-retaining water permeable concrete pavement material, comprising:

[0033] 1) mixing and stirring the steel slag coarse aggregate, a part of the cement and a part of the water, then adding the remaining part of the cement and the remaining water to stir to a dry hard state, and then adding the pre-wetted bottom slag aggregate and the lignocellulose to obtain the base layer water-retaining concrete;

[0034] 2) mixing and stirring the rubber emulsion and the water reducing agent in water to obtain a uniform solution A, and then stirring the cement, the steel slag sand and the rubber particles in the solution A to obtain the surface layer elastic anti-cracking water permeable concrete.

[0035] In the preparation method of the water-retaining water permeable concrete pavement material, in step 1), each component material is measured and weighed according to the concrete mixing ratio, the steel slag coarse aggregate, half of the cement and a small amount of water are first stirred for 10-15 s, then the other half of the cement and water are added and stirred for 10-20 s to a dry hard state, and then the fully pre-wetted bottom slag aggregate and lignocellulose are added and stirred for 8-15 s to obtain the base layer water-retaining concrete.

[0036] In the preparation method of the water-retaining type water-permeable concrete pavement material, in step 2), specifically, the surface of the concrete base layer is scraped, and each component material is measured according to the concrete mixing ratio; the rubber emulsion and the water reducing agent are added into water, fully diluted and stirred, and uniformly prepared; the cement, the steel slag sand and the rubber particles are stirred for 10-15s, then the water solution of the rubber emulsion and the water reducing agent is added, and stirred for 15-25s to obtain the surface layer elastic anti-cracking water-permeable concrete.

[0037] Use

[0038] The third aspect of the present application provides the use of the water-retaining type water-permeable concrete pavement material of the first aspect of the present application in the preparation of a water-retaining type water-permeable concrete pavement.

[0039] Water-retaining pervious concrete pavement

[0040] The fourth aspect of the present application provides a water-retaining type water-permeable concrete pavement prepared from the water-retaining type water-permeable concrete pavement material of the first aspect of the present application.

[0041] The base layer: the base layer water-retaining type concrete obtained in the second aspect of the present application is mixed well and placed in the construction site, and then paving, leveling and rolling are started to obtain the water-permeable concrete base layer.

[0042] The surface layer: the mixed elastic anti-cracking water-permeable concrete is introduced into the construction site on the water-permeable concrete base layer, and then paving, leveling and rolling are carried out to obtain the water-permeable concrete surface layer.

[0043] The paving thickness of the base layer and the surface layer refers to the first aspect of the present application.

[0044] Through the above improvement, the specific effects are as follows:

[0045] (1) The steel slag, the bottom slag and the waste rubber particles are used as solid wastes of metallurgical, electric power and chemical industries to prepare the water-permeable water-retaining type concrete, which not only realizes the collaborative treatment of solid wastes, but also saves natural resources such as river sand and gravel, and is helpful for the construction of “sponge city” and “waste-free city”.

[0046] (2) The bottom slag has the characteristics of low specific gravity (1.8-2.6 g / cm 3 ) and high water absorption (8-10%), and the lignin fiber can play a water-retaining and anti-cracking role when added into the concrete. The water-permeable concrete prepared by taking the steel slag as the main aggregate and the bottom slag and the lignin fiber as the filler can not only fully play the water-retaining and water-absorbing characteristics of the bottom slag and the lignin fiber, but also realize the synergy and the effect of combining hardness and softness, and improve the anti-cracking performance of the water-permeable concrete.

[0047] (3) Steel slag sand and waste rubber particles are used as aggregate, and carboxyl styrene latex is added for modification to prepare concrete. The rubber particles as elastic particles in the concrete can improve the internal pore structure of the concrete and effectively absorb vibration, thereby having the functions of vibration reduction and noise reduction. The steel slag and waste rubber can be turned into treasure, and the pavement can realize vibration reduction and noise reduction, elastic crack resistance, and improved traffic comfort.

[0048] The beneficial effects of the present application are further illustrated by the following examples.

[0049] In order to make the invention purpose, technical scheme and beneficial technical effects of the present application clearer, the present application is further described in detail by combining with the following examples. However, it should be understood that the examples of the present application are only for the purpose of explaining the present application, and are not intended to limit the present application, and the examples of the present application are not limited to the examples given in the specification. The specific experimental conditions or operation conditions not mentioned in the examples are made according to the conventional conditions or the conditions recommended by the material suppliers.

[0050] In addition, it should be understood that the one or more method steps mentioned in the present application do not exclude that there can be other method steps before and after the combination steps or other method steps can be inserted between the explicitly mentioned steps, unless otherwise stated; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present application does not exclude that there can be other devices / apparatuses before and after the combination devices / apparatuses or other devices / apparatuses can be inserted between the two explicitly mentioned devices / apparatuses, unless otherwise stated. Moreover, unless otherwise stated, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the arrangement order of each method step or to limit the range of implementation of the present application. The change or adjustment of the relative relationship, without substantial change of the technical content, is also regarded as the scope of implementation of the present application.

[0051] In the following examples, the reagents, materials and instruments used are commercially available unless otherwise specified.

[0052] The specific formula of the present application is as follows in terms of weight ratio:

[0053] Example 1:

[0054] Base layer water-retaining concrete:

[0055] Cement: 50 parts, 5-15 mm steel slag: 225 parts, 1-5 mm bottom slag: 60 parts, lignin fiber: 2 parts, water: 17.5 parts.

[0056] Surface layer elastic crack-resistant permeable concrete:

[0057] Cement: 30 parts; Steel slag of 1-3 mm: 105 parts; Rubber particles of 40 mesh: 13.5 parts, Rubber latex: 1.5 parts, Water reducing agent: 0.6 parts, Water: 9 parts.

[0058] (1) Base layer: each component material is measured according to the concrete mixing ratio, first the steel slag coarse aggregate, half of the cement and a small amount of water are stirred for 10-15 s, then the other half of the cement and water are stirred for 10-20 s to a dry hard state, then the fully pre-wetted bottom slag aggregate and lignocellulose are added and stirred for 8-15 s, the mixed water-retaining concrete is placed in the construction site, paving, leveling and rolling are started to obtain a pervious concrete base layer;

[0059] (2) Surface layer: the surface of the concrete base layer is scraped, and each component material is measured according to the concrete mixing ratio, the rubber latex and water reducing agent are added to water and stirred evenly for use, the cement, steel slag sand and rubber particles are stirred for 10-15 s, then the rubber latex and water reducing agent solution are added and stirred for 15-25 s, the mixed elastic anti-cracking pervious concrete is introduced into the construction site, paving, leveling and rolling are started to obtain a pervious concrete surface layer.

[0060] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0061] Example 2

[0062] Base layer water-retaining concrete:

[0063] Cement: 50 parts, Steel slag of 5-15 mm: 250 parts, Bottom slag of 1-5 mm: 51 parts, Lignin fiber: 2 parts, Water: 17.5 parts.

[0064] Surface layer elastic anti-cracking pervious concrete:

[0065] Cement: 30 parts; Steel slag of 1-3 mm: 120 parts; Rubber particles of 40 mesh: 9.5 parts, Rubber latex: 1.5 parts, Water reducing agent: 0.6 parts, Water: 9 parts.

[0066] (1) Base layer: each component material is measured according to the concrete mixing ratio, first the steel slag coarse aggregate, half of the cement and a small amount of water are stirred for 10-15 s, then the other half of the cement and water are stirred for 10-20 s to a dry hard state, then the fully pre-wetted bottom slag aggregate and lignocellulose are added and stirred for 8-15 s, the mixed water-retaining concrete is placed in the construction site, paving, leveling and rolling are started to obtain a pervious concrete base layer;

[0067] (2) Surface layer: scrape the surface of the concrete base layer, and measure the components according to the concrete mixing ratio. Rubber emulsion and water reducing agent are added to water, and stirred evenly. After the cement, steel slag sand and rubber particles are stirred for 10-15s, the water solution of rubber emulsion and water reducing agent is added, and stirred for 15-25s. The mixed elastic anti-cracking water permeable concrete is introduced into the construction site, and paving, leveling and rolling are performed to obtain the water permeable concrete surface layer.

[0068] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0069] Example 3

[0070] Base layer water-retaining concrete:

[0071] Cement: 50 parts, 5-15mm steel slag: 260 parts, 1-5mm bottom slag: 48 parts, lignin fiber: 2 parts, water: 17.5 parts.

[0072] Surface layer elastic anti-cracking water permeable concrete:

[0073] Cement: 30 parts; 1-3mm steel slag: 130 parts; 40 mesh rubber particles: 6 parts, rubber latex: 1.5 parts, water reducing agent: 0.6 parts, water: 9 parts.

[0074] (1) Base layer: measure the components according to the concrete mixing ratio. First, the steel slag coarse aggregate, half of the cement and a small amount of water are stirred for 10-15s. Then, the other half of the cement and water are added and stirred for 10-20s to a dry state. Then, the fully pre-wetted bottom slag aggregate and lignocellulose are added and stirred for 8-15s. The mixed water-retaining concrete is placed in the construction site, and paving, leveling and rolling are performed to obtain the water permeable concrete base layer.

[0075] (2) Surface layer: scrape the surface of the concrete base layer, and measure the components according to the concrete mixing ratio. Rubber emulsion and water reducing agent are added to water, and stirred evenly. After the cement, steel slag sand and rubber particles are stirred for 10-15s, the water solution of rubber emulsion and water reducing agent is added, and stirred for 15-25s. The mixed elastic anti-cracking water permeable concrete is introduced into the construction site, and paving, leveling and rolling are performed to obtain the water permeable concrete surface layer.

[0076] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0077] Example 4:

[0078] Base layer water-retaining concrete:

[0079] Cement: 50 parts, 5-15mm steel slag: 275 parts, 1-5mm bottom slag: 45 parts, lignin fiber: 2 parts, water: 17.5 parts.

[0080] Surface layer elastic anti-cracking pervious concrete:

[0081] Cement: 30 parts; 1-3 mm steel slag: 135 parts; 40 mesh rubber particles: 4.5 parts, rubber latex: 1.5 parts, water reducing agent: 0.6 parts, water: 9 parts.

[0082] (1) Base layer: measure and weigh each component material according to the concrete mix ratio, first mix the steel slag coarse aggregate, half of the cement and a small amount of water for 10-15s, then add the other half of the cement and water for 10-20s to a dry hard state, then add the fully pre-wetted bottom slag aggregate and lignocellulose to the mixture and stir for 8-15s, place the mixed water-retaining concrete into the construction site, start paving, leveling and rolling to obtain the pervious concrete base layer.

[0083] (2) Surface layer: scrape the surface of the concrete base layer, and at the same time, measure and weigh each component material according to the concrete mix ratio, now dilute and stir the rubber latex and water reducing agent in water until they are evenly mixed and ready for use, then mix the cement, steel slag sand and rubber particles for 10-15s, add the rubber latex and water reducing agent solution, stir for 15-25s, and then introduce the mixed elastic anti-cracking pervious concrete into the construction site, pave, level and roll to obtain the pervious concrete surface layer.

[0084] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0085] Comparative Example 1:

[0086] Base layer concrete:

[0087] Cement: 50 parts, 5-15 mm steel slag: 250 parts, water: 15 parts.

[0088] Surface layer pervious concrete:

[0089] Cement: 30 parts; 1-3 mm steel slag: 150 parts; water reducing agent: 0.6 parts, water: 9 parts.

[0090] (1) Base layer: measure and weigh each component material according to the concrete mix ratio, first mix the steel slag coarse aggregate, half of the cement and a small amount of water for 10-15s, then add the other half of the cement and water for 10-20s to a dry hard state, then add the fully pre-wetted bottom slag aggregate and lignocellulose to the mixture and stir for 8-15s, place the mixed water-retaining concrete into the construction site, start paving, leveling and rolling to obtain the pervious concrete base layer.

[0091] (2) Surface layer: scrape the surface of the concrete base layer, and at the same time, measure and weigh each component material according to the concrete mix ratio, now dilute and stir the rubber latex and water reducing agent in water until they are evenly mixed and ready for use, then mix the cement, steel slag sand and rubber particles for 10-15s, add the rubber latex and water reducing agent solution, stir for 15-25s, and then introduce the mixed elastic anti-cracking pervious concrete into the construction site, pave, level and roll to obtain the pervious concrete surface layer.

[0092] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0093] Comparative Example 2

[0094] Base layer water-retaining concrete:

[0095] Cement: 50 parts, 1-5 mm bottom ash: 150 parts, lignin fiber: 2 parts, water: 17.5 parts.

[0096] Surface layer elastic anti-cracking water-permeable concrete:

[0097] Cement: 30 parts; 1-3 mm steel slag: 150 parts; rubber latex: 1.5 parts, water reducing agent: 0.6 parts, water: 9 parts.

[0098] (1) Base layer: measure the components according to the concrete mixing ratio, first mix half of the cement and a small amount of water for 10-15 seconds, then add the other half of the cement and water for 10-20 seconds to a dry state, then add the fully pre-wetted bottom ash aggregate and lignocellulose to the mixture and stir for 8-15 seconds. Put the mixed water-retaining concrete into the construction site, start paving, leveling and rolling to obtain the water-permeable concrete base layer.

[0099] (2) Surface layer: scrape the concrete base layer surface, and measure the components according to the concrete mixing ratio, then dilute and stir the rubber latex and water reducing agent in water until they are evenly distributed, then mix the cement and steel slag sand for 10-15 seconds, then add the rubber latex and water reducing agent solution, and stir for 15-25 seconds. Put the mixed elastic anti-cracking water-permeable concrete into the construction site, pave, level and roll to obtain the water-permeable concrete surface layer.

[0100] The thickness ratio of the surface layer to the bottom layer is 2:8.

[0101] Table 1

[0102]

[0103]

[0104] The performance of the examples and comparative examples was tested, and the specific results are shown in Table 2:

[0105] Table 2

[0106]

[0107]

[0108] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A water-retaining pervious concrete pavement material, comprising a base layer water-retaining concrete and a surface layer elastic anti-cracking pervious concrete, raw materials of the base layer water-retaining concrete comprising cement, steel slag coarse aggregate, bottom slag aggregate, lignin fiber and water, raw materials of the surface layer elastic anti-cracking pervious concrete comprising cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent and water; the weight ratio of the cement, steel slag coarse aggregate, bottom slag aggregate, lignin fiber and water being 1: (4.5-5.5) : (0.9-1.2) : 0.04: 0.35; the weight ratio of the cement, steel slag sand, rubber particles, rubber emulsion, water reducing agent and water being 1: (3.5-4.5) : (0.15-0.45) : (0.05-0.1) : (0.02-0.05) : 0.

3. The thickness ratio of the base layer water-retaining concrete and the surface layer elastic anti-cracking pervious concrete is (1-3) : (7-9).

2. The water retaining pervious concrete pavement material of claim 1, wherein, The cement in the base layer water-retaining concrete and the surface layer elastic anti-cracking pervious concrete is 42.5 ordinary portland cement.

3. The water retaining pervious concrete pavement material of claim 1, wherein, The base layer water-retaining concrete further comprises any one or more of the following features:

4. The water retaining pervious concrete pavement material of claim 1, wherein, A1) the particle size of the steel slag coarse aggregate is 5-15 mm; A2) the free calcium content in the steel slag coarse aggregate is <3%, and the MFe content is ≤1%; A3) the particle size of the bottom slag aggregate is 0-3 mm. The surface layer elastic anti-cracking pervious concrete further comprises any one or more of the following features:

5. The water retaining pervious concrete pavement material of claim 1, wherein, B1) the particle size of the steel slag sand is 1-3 mm; B2) the free calcium content in the steel slag sand is <3%, and the MFe content is ≤1%; B3) the rubber particles are 30-50 mesh; B4) the rubber emulsion is carboxyl styrene-butadiene latex with a solid content of 50-52% and a viscosity of 35-150 mPa.s at 25°C; B5) the water reducing agent is selected from polycarboxylic acid superplasticizer. 6.A method for preparing the water-retaining pervious concrete pavement material according to any one of claims 1-5, comprising: 1) mixing the steel slag coarse aggregate, a part of the cement and a part of the water, then adding the remaining cement and the remaining water to stir to a dry-hard state, and then adding the pre-wetted bottom slag aggregate and lignocellulose to obtain the base layer water-retaining concrete; 2) mixing the rubber emulsion and the water reducing agent in water to obtain a uniform solution A, then adding the cement, the steel slag sand and the rubber particles to the solution A to obtain the surface layer elastic anti-cracking pervious concrete. 7.Use of the water-retaining pervious concrete pavement material according to any one of claims 1-5 in the preparation of a water-retaining pervious concrete pavement. 8.A water-retaining pervious concrete pavement prepared from the water-retaining pervious concrete pavement material according to any one of claims 1-5. ​

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