A road paving material using solid waste as aggregate, and a preparation method and application thereof

Abstract

The application relates to the field of building materials, in particular to a road paving material taking solid waste as aggregate as well as a preparation method and application thereof. The road paving material taking solid waste as aggregate comprises a double-layer structure, a shield muck layer located at an upper layer, and a basement layer located at a lower layer and bonded with the shield muck layer; the shield muck layer is prepared from the following raw materials: 30-50 parts of shield muck, and 6-10 parts of gel material; the basement layer is prepared from the following raw materials: 15-25 parts of cement material, 10-20 parts of fine aggregate, 5-10 parts of low-quality recycled aggregate, 4-10 parts of bonding resin, 10-20 parts of modified fiber material, 1-1.5 parts of water reducing agent, 0.5-0.8 parts of reinforcing agent, 3-8 parts of dispersing agent, and 25-40 parts of water. The paving material prepared by the application not only has good mechanical properties and mechanical stability, but also can maintain excellent waterproof, aging corrosion resistance and other performances under various environments, so that the performance defects of the existing paving material are made up.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building materials, in particular to a road paving material using solid waste as aggregate and a preparation method and application thereof. BACKGROUND

[0002] With the acceleration of urbanization, underground space development is increasing, and shield method is widely used in subway, highway tunnel and other engineering as an efficient tunnel construction method. A large amount of shield muck is produced during shield construction, which is mainly composed of soil and rock in the stratum, usually containing a certain amount of water and other impurities. The traditional treatment method is to transport the shield muck to the designated place for landfill or stacking, which not only occupies a large amount of land resources, but also may cause environmental pollution, increases the construction cost and social burden.

[0003] In recent years, in order to effectively solve the problem of shield muck treatment and respond to the call of the state on energy saving and emission reduction and resource recycling, researchers have begun to explore the possibility of converting shield muck into valuable building materials. The road paving material using solid waste as aggregate is one of the important achievements in this research direction. Through scientific and reasonable formula design and technical means, the material mixes shield muck with other building materials, and after a series of processing procedures, it finally forms a paving material with certain strength, wear resistance and water permeability, which is suitable for ground paving in parks, squares, sidewalks and other places.

[0004] Although the road paving material using solid waste as aggregate solves the problem of shield muck treatment to a certain extent and has good environmental and economic benefits, there are still some deficiencies in the existing technology, for example: due to the complex source of shield muck, the composition of muck produced by different engineering projects is quite different, which leads to unstable performance of the prepared paving material, especially the mechanical properties, which is difficult to meet the high standard engineering requirements; and there are still some shortcomings in waterproofness, aging resistance and corrosion resistance, which limit its application in more extensive scenarios.

[0005] In order to solve the above problems, the present application provides a road paving material using solid waste as aggregate and a preparation method thereof. The paving material prepared by the present application not only has good mechanical properties and mechanical stability, but also can maintain excellent waterproofness, aging resistance, corrosion resistance and other properties in various environments, thereby making up for the performance defects of the existing paving material, effectively expanding its application in more extensive scenarios, and having very excellent application prospect. SUMMARY

[0006] To solve the above problems, the first aspect of the present application provides a road paving material taking solid waste as aggregate, which comprises a double-layer structure, a shield muck layer located in the upper layer, and a substrate layer located in the lower layer and adhered to the shield muck layer.

[0007] As a preferred scheme, the shield muck layer, in terms of mass parts, has raw materials including: 30-50 parts of shield muck, and 6-10 parts of gel material.

[0008] As a preferred scheme, the substrate layer, in terms of mass parts, has raw materials including: 15-25 parts of cement material, 10-20 parts of fine aggregate, 5-10 parts of low-quality recycled aggregate, 4-10 parts of bonding resin, 10-20 parts of modified fiber material, 1-1.5 parts of water reducing agent, 0.5-0.8 parts of reinforcing agent, 3-8 parts of dispersant, and 25-40 parts of water.

[0009] As a preferred scheme, the gel material is a water-based polyurethane resin; and the water-based polyurethane resin has a solid content of 55-65 wt%.

[0010] As a preferred scheme, the mass ratio of the shield muck, the fine aggregate, and the low-quality recycled aggregate is (35-45):(12-18):(6-9).

[0011] As a preferred scheme, the mass ratio of the shield muck, the fine aggregate, and the low-quality recycled aggregate is (38-44):(14-16):(7-8).

[0012] As a preferred scheme, the mass ratio of the shield muck, the cement material, the bonding resin, and the modified fiber material is (35-45):(18-24):(5-9):(12-18).

[0013] As a preferred scheme, the mass ratio of the shield muck, the cement material, the bonding resin, and the modified fiber material is (38-44):(19-22):(6-8):(15-17).

[0014] As a preferred scheme, the mass ratio of the modified fiber material and the dispersant is (12-18):(5-8).

[0015] As a preferred scheme, the mass ratio of the modified fiber material and the dispersant is (15-17):(6-7).

[0016] As a preferred scheme, the average particle size of the shield muck is 1-10 mm.

[0017] As a preferred scheme, the average particle size of the shield muck is 1.1-2.5 mm.

[0018] As a preferred scheme, the content of the plastic and non-natural substance in the shield muck is ≤2.5wt%.

[0019] As a preferred scheme, the cement material is ordinary Portland cement or Portland cement.

[0020] As a preferred scheme, the fine aggregate is river sand or quartz sand.

[0021] As a preferred scheme, the average particle size of the fine aggregate is 4.75-9.5mm.

[0022] As a preferred scheme, the low-quality recycled aggregate is gravel or pebble.

[0023] As a preferred scheme, the average particle size of the low-quality recycled aggregate is 26-31.5mm.

[0024] As a preferred scheme, the binding resin is a copolymer binding resin.

[0025] As a preferred scheme, the preparation method of the copolymer binding resin comprises the following steps: S1: mixing cyclohexyl methacrylate, dodecyl acrylate and tert-butyl acrylate, adding an initiator under nitrogen protection, and adding to an acryloyl chloride solution, heating at 70-85℃ for 2-2.5h to obtain a prepolymer; S2: then mixing the prepolymer with ethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate and acrylamide, adding to deionized water, adding an initiator, and heating to 70-80℃ under nitrogen protection, and reacting for 4-6h; S3: filtering the product obtained in S2, and then washing with acetone, ethanol and deionized water, and drying to obtain the product.

[0026] As a preferred scheme, the mass ratio of cyclohexyl methacrylate, dodecyl acrylate and tert-butyl acrylate is (10-15):(3-4):(1-1.5).

[0027] As a preferred scheme, the mass ratio of the prepolymer, ethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate and acrylamide is (6-8):(0.5-1):(2-3):(40-45).

[0028] As a preferred scheme, the initiator is potassium persulfate.

[0029] As a preferred scheme, the preparation method of the modified fiber material comprises the following steps: S1: adding short carbon fibers and polypropylene fibers into a DMF solution, heating to 65-75℃, adding succinic anhydride and titanium isopropyl pyrophosphate, and reacting for 2-3h, then filtering, washing, and drying to obtain pretreated fibers; S2: adding the pretreated fibers, zirconium chloride, 1,4-benzenedicarboxylic acid and p-aminobenzoic acid into DMF, stirring until complete, heating to 120-130℃, and reacting for 20-22h, then naturally cooling the product to room temperature, and washing with DMF and anhydrous ethanol alternately for 2-3 times to obtain the modified fiber material.

[0030] As a preferred scheme, the mass ratio of the short carbon fibers, polypropylene fibers, succinic anhydride and titanium isopropyl pyrophosphate is (5-6):(1-2):(1.5-2):(0.2-0.4).

[0031] As a preferred scheme, the average diameter of the short carbon fibers is 4.5-6μm, and the average length is 5-10mm.

[0032] As a preferred scheme, the average diameter of the polypropylene fibers is 10-15μm, and the average length is 15-25mm.

[0033] As a preferred scheme, the mass ratio of the pretreated fibers, zirconium chloride, 1,4-benzenedicarboxylic acid and p-aminobenzoic acid is (4-5):(2-2.5):(1.2-1.5):(0.6-1).

[0034] In the present application, the addition of the above-mentioned modified fiber material can greatly enhance the mechanical properties and mechanical stability of the road paving material, and can simultaneously effectively improve the waterproof, corrosion-resistant and aging-resistant properties of the material. The added modified fiber material can use carbon fibers and polypropylene fibers as the main body of intersection, and further entangle the carbon fibers and polypropylene fibers through the frame particles formed by embedding on the surface, thereby greatly enhancing the mechanical connection properties of the mixed fibers. When the modified fiber material is added to the paving material, it can act as a connection site in the paving material system, and through better entanglement effect, it can achieve stability in the system, and then through stronger fiber force, it can play an excellent supporting and connecting role under external force, thereby obtaining more excellent mechanical and mechanical properties for the paving material, and maintaining excellent stability, reducing the migration and segregation of the fiber material.

[0035] On the other hand, the added modified fiber material can absorb the internal trace moisture through the frame particles embedded on the surface, remove the internal moisture, and at the same time, help the paving system to form a more dense and rugged surface on the surface, and further realize the cross-complex peak-valley structure of the paving material surface. The existence of this structure can greatly improve the difficulty of the hydration layer formed on the material surface, thereby avoiding the continuous sheeting of the hydration layer, reducing the driving force of the water molecules and active groups to penetrate inward, improving the internal resistance, and further achieving better waterproof, corrosion-resistant, and aging-resistant properties in more humid, hot, and chemical application environments.

[0036] As a preferred solution, the water reducing agent is a naphthalene-based water reducing agent or a polycarboxylic acid water reducing agent.

[0037] As a preferred solution, the water reducing agent is a polycarboxylic acid water reducing agent.

[0038] As a preferred solution, the reinforcing agent is at least one of calcium chloride, sodium chloride, sodium sulfate, potassium sulfate, sodium nitrite, triethanolamine, and diethanol mono-isopropanol amine.

[0039] As a preferred solution, the reinforcing agent is triethanolamine.

[0040] As a preferred solution, the dispersing agent is a combination of lauryl alcohol polyoxyethylene ether and epoxy block polyether.

[0041] As a preferred solution, the mass ratio of lauryl alcohol polyoxyethylene ether and epoxy block polyether is (6-8):(1-1.5).

[0042] As a preferred solution, the hydroxyl value of the lauryl alcohol polyoxyethylene ether is 150-200 mg KOH / g.

[0043] As a preferred solution, the weight average molecular weight of the epoxy block polyether is 3000-5000 Da.

[0044] The second aspect of the application provides a preparation method of the road paving material taking solid waste as aggregate, which specifically comprises the following steps: S1: placing cement material, fine aggregate, fine aggregate and bonding resin into a stirrer, stirring at a low speed of 100-200 rpm for 3-5 min to make them fully mixed and uniform, and then adding modified fiber material and stirring at 300-400 rpm for 10-15 min; S3: sequentially and slowly adding water reducing agent, reinforcing agent and dispersant, and adding water in three equal batches during the process, and stirring at 600-800 rpm for 5-10 min until the mixture is in a uniform state; S3: pouring the stirred mixture into a pre-prepared mold, vibrating and compacting to ensure uniform material distribution and smooth surface, and placing the shaped material at room temperature for 20-24 h for preliminary solidification to obtain a base layer; S3: mixing shield slag and gel material, and stirring in a high-speed stirrer at 400-500 rpm for 30-40 min, and then uniformly spreading the mixed product on the surface of the base layer and compacting, and keeping the temperature at 60-70 DEG C until complete hardening to obtain a shield slag layer, and then moving the obtained material to a standard curing chamber with a temperature controlled at 20±2 DEG C, and after standard curing for 6-7 d, the road paving material is obtained.

[0045] The third aspect of the application provides an application of the road paving material taking solid waste as aggregate in city park paving, residential area paving, commercial street paving and industrial park paving.

[0046] The application has the following beneficial effects:

[0047] 1. The road paving material taking solid waste as aggregate provided in the application not only has good mechanical properties and mechanical stability, but also can maintain excellent waterproof, aging-resistant and corrosion-resistant properties in various environments, thereby making up for the performance defects of existing paving materials, effectively expanding the application of the paving material in a wider range of scenarios, and having very excellent application prospects.

[0048] 2. The road paving material taking solid waste as aggregate provided in the application can greatly enhance the mechanical properties and mechanical stability of the road paving material by adding modified fiber material, and can also effectively improve the waterproof, corrosion-resistant and aging-resistant properties of the material; the added modified fiber material can take carbon fiber and polypropylene fiber as the main body, and the further entanglement of the carbon fiber and polypropylene fiber can be realized through the frame particles formed by embedding on the surface of the modified fiber material, thereby greatly enhancing the mechanical connection properties of the mixed fiber; when the modified fiber material is added to the paving material, it can act as a connection site in the paving material system, and the stability in the system can be realized through better entanglement, thereby playing an excellent supporting and connecting role through stronger fiber force under external force, and thus obtaining more excellent mechanical and mechanical properties for the paving material and maintaining excellent stability.

[0049] 3、The road paving material provided in the present application uses solid waste as aggregate, the addition of copolymer binding resin can improve the mechanical, waterproof and aging-resistant properties of the material in cooperation with the modified fiber material, the addition of copolymer binding resin can act on the excellent flow carrier of the modified fiber material, and it can realize good connection with a large number of heteroatoms on the surface of carbon fiber, thereby playing a role of fixing and enhancing the modified fiber material, and this role can effectively improve the effect of the modified fiber in the paving material in a specific environment, thereby comprehensively improving the overall performance. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 The road paving material provided in the present application uses solid waste as aggregate, the addition of copolymer binding resin can improve the mechanical, waterproof and aging-resistant properties of the material in cooperation with the modified fiber material, the addition of copolymer binding resin can act on the excellent flow carrier of the modified fiber material, and it can realize good connection with a large number of heteroatoms on the surface of carbon fiber, thereby playing a role of fixing and enhancing the modified fiber material, and this role can effectively improve the effect of the modified fiber in the paving material in a specific environment, thereby comprehensively improving the overall performance.

[0051] In the figure: 1 - shield slag layer, 2 - base layer. DETAILED DESCRIPTION

[0052] The technical solutions in the above summary of the present application will be further described and demonstrated in the form of specific embodiments. The following examples are only actual examples for illustrating and explaining the content of the technical solutions in the specification, and should not limit the scope of the claims to be protected by the present application. Any technical product based on the technical solutions described in the summary of the present application should be covered in the scope to be protected by the present application.

[0053] In the following examples, unless otherwise specified, the raw materials are commercially available products or can be prepared by methods well known to those skilled in the art.

[0054] Example 1

[0055] Example 1 provides a road paving material using solid waste as aggregate, which comprises a double-layer structure, a shield slag layer located in the upper layer, and a base layer located in the lower layer and bonded with the shield slag layer.

[0056] The shield slag layer, in terms of mass parts, has the following raw materials: shield slag 41.5 parts, gel material 8.2 parts.

[0057] The gel material is a water-based polyurethane resin with a solid content of 60wt%, which is purchased from the corresponding solid content product sold by Shandong Hualu Hengsheng Chemical Co., Ltd., China.

[0058] The base layer, in terms of mass parts, has the following raw materials: cement material 21.2 parts, fine aggregate 14.8 parts, low-quality recycled aggregate 7.2 parts, binding resin 7.4 parts, modified fiber material 16.1 parts, water reducing agent 1.2 parts, reinforcing agent 0.6 parts, dispersing agent 6.5 parts, and water 34.8 parts.

[0059] The average particle size of the shield sludge is 2.34 mm, and the content of plastic and non-natural substances in the shield sludge is ≤2.5wt%.

[0060] The cement material is ordinary Portland cement P.O32.5.

[0061] The fine aggregate is quartz sand, and the average particle size is 5.5 mm; the low-quality recycled aggregate is gravel, and the average particle size is 29.5 mm.

[0062] The bonding resin is a copolymer bonding resin, and the preparation method comprises the following steps: S1: mixing 12.5 parts of cyclohexyl methacrylate, 3.2 parts of dodecyl acrylate and 1.4 parts of tert-butyl acrylate, adding 0.11 parts of potassium persulfate under nitrogen protection, and adding into 80 parts of acryloyl chloride solution, heating at 80℃ for 2.2h to obtain a prepolymer; S2: then mixing 7.5 parts of the prepolymer with 0.6 parts of ethylene glycol dimethacrylate, 2.5 parts of 2-hydroxyethyl methacrylate and 42.5 parts of acrylamide into 400 parts of deionized water, adding 0.45 parts of potassium persulfate, and heating to 75℃ under nitrogen protection for 5.5h; S3: filtering the product obtained in S2, and then sequentially washing with acetone, ethanol and deionized water, and drying to obtain the product.

[0063] The preparation method of the modified fiber material comprises the following steps: S1: adding 5.8 parts of short carbon fibers and 1.2 parts of polypropylene fibers into 120 parts of DMF solution, heating to 70℃, adding 1.8 parts of succinic anhydride and 0.28 parts of titanium isopropyl pyrophosphate, and reacting for 2h, then filtering, washing and drying to obtain pretreated fibers; S2: mixing 4.4 parts of the pretreated fibers, 2.2 parts of zirconium chloride and 1.4 parts of 1,4-benzenedicarboxylic acid and 0.75 parts of p-aminobenzoic acid into 150 parts of DMF, stirring until complete, heating to 125℃, and reacting for 21h, then naturally cooling the product to room temperature, and washing with DMF and anhydrous ethanol alternately for 3 times to obtain the modified fiber material.

[0064] The average diameter of the short carbon fibers is 5.5μm, and the average length is 7.5mm, which are purchased from corresponding size products sold by Jiangxi Suobang New Material Technology Co., Ltd.

[0065] The average diameter of the polypropylene fibers is 12μm, and the average length is 20.5mm, which are purchased from corresponding size products sold by Shandong Yiheng Engineering Material Co., Ltd.

[0066] The water reducing agent is an early strength polycarboxylic acid water reducing agent, which is purchased from Jin Yongshuo Chemical Co., Ltd.

[0067] The reinforcing agent is triethanolamine; the dispersing agent is a combination of lauryl alcohol polyoxyethylene ether and epoxy block polyether, and the mass ratio of the two is 6.5:1.2.

[0068] The hydroxyl value of the lauryl alcohol polyoxyethylene ether is 180 mgKOH / g, and is purchased from MOA-3 type product sold by Haian Guoyun Chemical Co., Ltd. in China.

[0069] The weight average molecular weight of the epoxy block polyether is 4200 Da, and is purchased from L84 type ethylene oxide-propylene oxide block polyether product sold by BASF in Germany.

[0070] The second aspect of the embodiment provides a preparation method of the road paving material with solid waste as aggregate, and specifically comprises the following steps: S1: placing cement material, fine aggregate, fine aggregate and bonding resin into a stirrer, stirring at a low speed of 180 rpm for 4 min to fully mix and uniformly distribute them, and then adding modified fiber material and stirring at 350 rpm for 12 min; S3: sequentially and slowly adding water reducing agent, reinforcing agent and dispersant, and adding water in three batches during the process, and stirring at 680 rpm for 8 min until the mixture is in a uniform state; S3: pouring the stirred mixture into a pre-prepared mold, vibrating and compacting to ensure uniform distribution of the material and smooth surface, and placing the formed material at room temperature for 22 h for preliminary solidification to obtain a base layer; S3: mixing shield muck and gel material, and stirring and mixing them in a high-speed stirrer at 420 rpm for 35 min, and then uniformly spreading and compacting the mixed product on the surface of the base layer, and keeping the temperature at 70 DEG C until complete hardening to obtain a shield muck layer, and then moving the obtained material to a standard curing chamber, controlling the temperature at 20±2 DEG C, and obtaining the final product after standard curing for 7 d.

[0071] Example 2

[0072] The specific implementation of the embodiment is basically the same as that of Example 1, and the only difference is that the raw materials of the shield muck layer are shield muck 35.5 parts and gel material 6.4 parts by mass.

[0073] The raw materials of the base layer are cement material 23.1 parts, fine aggregate 12.6 parts, low-quality recycled aggregate 8.5 parts, bonding resin 8.5 parts, modified fiber material 17.6 parts, water reducing agent 1.2 parts, reinforcing agent 0.6 parts, dispersant 6.5 parts and water 35.2 parts by mass.

[0074] Example 3

[0075] The specific implementation of the embodiment is basically the same as that of Example 1, and the only difference is that the raw materials of the shield muck layer are shield muck 36.8 parts and gel material 6.5 parts by mass.

[0076] The base layer, in terms of mass parts, has the following raw materials: cement 18.4 parts, fine aggregate 17.5 parts, low-quality recycled aggregate 6.5 parts, binding resin 7.4 parts, modified fiber material 13.5 parts, water reducing agent 1.2 parts, reinforcing agent 0.6 parts, dispersing agent 6.5 parts, and water 32.2 parts.

[0077] Comparative Example 1

[0078] The specific implementation of the present comparative example is basically the same as that of Example 1, except that the base layer, in terms of mass parts, has the following raw materials: cement 25.5 parts, fine aggregate 17.5 parts, low-quality recycled aggregate 3.2 parts, binding resin 3.2 parts, modified fiber material 25.5 parts, water reducing agent 1.6 parts, reinforcing agent 0.8 parts, dispersing agent 4.4 parts, and water 45.8 parts.

[0079] Comparative Example 2

[0080] The specific implementation of the present comparative example is basically the same as that of Example 1, except that the base layer, in terms of mass parts, has the following raw materials: cement 14.6 parts, fine aggregate 10.8 parts, low-quality recycled aggregate 2.8 parts, binding resin 10.5 parts, modified fiber material 8.8 parts, water reducing agent 1.2 parts, reinforcing agent 0.6 parts, dispersing agent 2.1 parts, and water 30.5 parts.

[0081] Comparative Example 3

[0082] The specific implementation of the present comparative example is basically the same as that of Example 1, except that the binding resin is a copolymer binding resin, and the preparation method includes the following steps: S1: mixing 25 parts of cyclohexyl methacrylate, 4.5 parts of dodecyl acrylate, and 0.5 parts of tert-butyl acrylate, adding 0.19 parts of potassium persulfate under nitrogen protection, and adding to 80 parts of an acryloyl chloride solution, heating at 80°C for 2.2 h to obtain a prepolymer; S2: then mixing 7.5 parts of the prepolymer with 0.6 parts of ethylene glycol dimethacrylate, 2.5 parts of 2-hydroxyethyl methacrylate, and 42.5 parts of acrylamide, adding to 400 parts of deionized water, adding 0.45 parts of potassium persulfate, and heating to 75°C under nitrogen protection for 5.5 h of reaction; S3: filtering the product obtained in S2, and then sequentially washing with acetone, ethanol, and deionized water, and drying to obtain the copolymer binding resin.

[0083] Comparative Example 4

[0084] The specific embodiment of the present comparative example is basically the same as that of Example 1, except that the bonding resin is a copolymer bonding resin, and the preparation method comprises the following steps: S1: mixing 12.5 parts of cyclohexyl methacrylate, 3.2 parts of dodecyl acrylate and 1.4 parts of tert-butyl acrylate, adding 0.11 parts of potassium persulfate under nitrogen protection, and adding into 80 parts of acryloyl chloride solution, heating at 80°C for 2.2h to obtain a prepolymer; S2: then mixing 2.5 parts of the prepolymer with 0.2 parts of ethylene glycol dimethacrylate, 8.5 parts of 2-hydroxyethyl methacrylate and 55 parts of acrylamide into 520 parts of deionized water, adding 0.58 parts of potassium persulfate, heating to 75°C under nitrogen protection, and reacting for 6.5h; S3: filtering the product obtained in S2, and then sequentially washing with acetone, ethanol and deionized water, and drying to obtain the product.

[0085] Comparative Example 5

[0086] The specific embodiment of the present comparative example is basically the same as that of Example 1, except that the preparation method of the modified fiber material comprises the following steps: S1: adding 8.5 parts of chopped carbon fiber and 0.5 parts of polypropylene fiber into 120 parts of DMF solution, adding 1.2 parts of succinic anhydride and 0.14 parts of isopropyl titanate pyrophosphate at 70°C, reacting for 2h, filtering and washing after completion, and drying to obtain pretreated fiber; S2: mixing 4.4 parts of the pretreated fiber, 2.2 parts of zirconium chloride and 1.4 parts of 1,4-benzenedicarboxylic acid and 0.75 parts of p-aminobenzoic acid into 150 parts of DMF, stirring until complete, heating to 125°C, and reacting for 21h, then naturally cooling the product to room temperature, and washing with DMF and anhydrous ethanol alternately for 3 times to obtain the modified fiber material.

[0087] Comparative Example 6

[0088] The specific embodiment of the present comparative example is basically the same as that of Example 1, except that the preparation method of the modified fiber material comprises the following steps: S1: adding 5.8 parts of chopped carbon fiber and 1.2 parts of polypropylene fiber into 120 parts of DMF solution, adding 1.8 parts of succinic anhydride and 0.28 parts of isopropyl titanate pyrophosphate at 70°C, reacting for 2h, filtering and washing after completion, and drying to obtain pretreated fiber; S2: mixing 2.2 parts of the pretreated fiber, 3.5 parts of zirconium chloride and 2.2 parts of 1,4-benzenedicarboxylic acid and 1.1 parts of p-aminobenzoic acid into 180 parts of DMF, stirring until complete, heating to 125°C, and reacting for 21h, then naturally cooling the product to room temperature, and washing with DMF and anhydrous ethanol alternately for 3 times to obtain the modified fiber material.

[0089] Comparative Example 7

[0090] The specific implementation of the comparative example is basically the same as that of Example 1, except that the average diameter of the short-cut carbon fiber is 10.5 μm, the average length is 18 mm, and the corresponding size product is purchased from Jiangxi Suobang New Material Technology Co., Ltd.

[0091] Performance evaluation

[0092] Compressive strength: The mechanical strength of the road paving materials prepared in the examples and comparative examples after curing was tested (28d) according to the standard GB / T 50081-2019, and the test value was the average of 10 tests recorded in Table 1.

[0093] Waterproof and impermeable pressure: The impermeable pressure of the road paving materials prepared in the examples and comparative examples after curing was tested according to the standard GB / T 50082-2009, and the result was expressed as the maximum impermeable water pressure, and the test value was the average of 10 tests recorded in Table 1.

[0094] Corrosion resistance: The road paving materials prepared in the examples and comparative examples were made into sample bricks of 10 cm x 5 cm x 2 cm, and the sample bricks were sprayed with 5 wt% NaCl as the spraying environment, with a spraying speed of 1.5 mL / h·cm 2 , and the test environment was 65±3℃ and 80±2% relative humidity, and the aging corrosion of the sample bricks after 3 months was tested. If the sample bricks have yellowing, corrosion, cracking and damage after 3 months, they are recorded as unqualified, otherwise they are qualified. 50 samples were tested in each group, and the qualified rate results were recorded in Table 1.

[0095] Table 1 Performance test results

[0096]

[0097]

[0098] From the data results of the examples and comparative examples of the present application and Table 1, it can be seen that Examples 1-3 of the present application have obvious advantages in mechanical properties, waterproof properties, corrosion resistance and aging resistance compared to Comparative Examples 1-7. This is mainly because the modified polymeric resin, the modified fiber material and other matching schemes defined in the present application work together, while Comparative Examples 1-7 do not use the technical solution defined in the present application, resulting in obvious disadvantages in the above performance tests, which further proves the necessity of the technical solution defined in the present application for the technical effects and solving technical problems of the present application.

Claims

1. A road paving material using solid waste as aggregate, characterized in that: The road paving material includes a double-layer structure, with an upper shield tunneling waste soil layer and a lower base layer that is in contact with the shield tunneling waste soil layer. The shield tunneling slag layer, by mass, consists of: 30-50 parts shield tunneling slag and 6-10 parts gel material. The base layer, by weight, comprises the following raw materials: 15-25 parts cement, 10-20 parts fine aggregate, 5-10 parts low-quality recycled aggregate, 4-10 parts bonding resin, 10-20 parts modified fiber material, 1-1.5 parts water-reducing agent, 0.5-0.8 parts reinforcing agent, 3-8 parts dispersant, and 25-40 parts water. The gel material is a water-based polyurethane resin; the solid content of the water-based polyurethane resin is 55~65 wt%. The average particle size of the tunnel boring machine excavation soil is 1~10mm; The content of plastics and non-natural materials in the tunnel boring machine excavation soil is ≤2.5wt%; The fine aggregate is river sand or quartz sand; the average particle size of the fine aggregate is 4.75~9.5mm; The low-quality recycled aggregate is crushed stone or gravel; the average particle size of the low-quality recycled aggregate is 26~31.5mm; The bonding resin is a copolymer bonding resin; the preparation method of the copolymer bonding resin includes the following steps: S1: cyclohexyl methacrylate, dodecyl acrylate and tert-butyl acrylate are mixed, an initiator is added under nitrogen protection, and then added to an acryloyl chloride solution. The mixture is heated at 70-85°C for 2-2.5 hours to obtain a prepolymer; S2: the prepolymer is then mixed with ethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate and acrylamide and added to deionized water. An initiator is added, and the mixture is heated to 70-80°C under nitrogen protection and kept at this temperature for 4-6 hours; S3: the product obtained in S2 is filtered, washed successively with acetone, ethanol and deionized water, and then dried. After drying, the product is obtained. The preparation method of the modified fiber material includes the following steps: S1: Short-cut carbon fibers and polypropylene fibers are added to a DMF solution, heated to 65~75℃, succinic anhydride and isopropyl titanate pyrophosphate are added, and the reaction is maintained for 2~3 hours. After completion, the mixture is filtered, washed, and dried to obtain pretreated fibers; S2: The pretreated fibers, zirconium chloride, 1,4-phthalic acid and p-aminobenzoic acid are mixed and added to DMF and stirred completely. The temperature is raised to 120~130℃ and the reaction is maintained for 20~22 hours. After completion, the product is naturally cooled to room temperature, and washed alternately with DMF and anhydrous ethanol 2~3 times to obtain the modified fiber material.

2. The road paving material using solid waste as aggregate according to claim 1, characterized in that: The mass ratio of cyclohexyl methacrylate, dodecyl acrylate and tert-butyl acrylate is (10~15):(3~4):(1~1.5); the mass ratio of the prepolymer, ethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate and acrylamide is (6~8):(0.5~1):(2~3):(40~45).

3. The road paving material using solid waste as aggregate according to claim 2, characterized in that: The mass ratio of the shield tunneling slag, fine aggregate and low-quality recycled aggregate is (35~45):(12~18):(6~9); the mass ratio of the shield tunneling slag, cement, bonding resin and modified fiber material is (35~45):(18~24):(5~9):(12~18).

4. The road paving material using solid waste as aggregate according to claim 3, characterized in that: The mass ratio of the short-cut carbon fiber, polypropylene fiber, succinic anhydride and isopropyl titanate pyrophosphate is (5~6):(1~2):(1.5~2):(0.2~0.4).

5. The road paving material using solid waste as aggregate according to claim 4, characterized in that: The average diameter of the chopped carbon fibers is 4.5~6μm, and the average length is 5~10mm.

6. The road paving material using solid waste as aggregate according to claim 5, characterized in that: The polypropylene fibers have an average diameter of 10-15 μm and an average length of 15-25 mm.

7. The road paving material using solid waste as aggregate according to claim 6, characterized in that: The mass ratio of the pretreated fiber, zirconium chloride, 1,4-phthalic acid and p-aminobenzoic acid is (4~5):(2~2.5):(1.2~1.5):(0.6~1).

8. A method for preparing road paving material using solid waste as aggregate according to any one of claims 1 to 7, characterized in that: Specifically, the following steps are included: S1: Place the cementitious material, fine aggregate, low-quality recycled aggregate, and bonding resin into a mixer and mix at a low speed of 100-200 rpm for 3-5 minutes to ensure thorough mixing. Then add the modified fiber material and mix at 300-400 rpm for 10-15 minutes. S3: Slowly add the water-reducing agent, reinforcing agent, and dispersant in sequence, adding water in three equal batches during this process. Mix at 600-800 rpm for 5-10 minutes until the mixture is homogeneous. S4: Pour the mixed material into a pre-prepared mold. Vibration compaction ensures uniform material distribution and a smooth surface. The molded material is left to stand at room temperature for 20-24 hours for initial curing to obtain the base layer. S3: Mix the shield tunnel slag and gel material in a high-speed mixer at 400-500 rpm for 30-40 minutes. Then, spread the mixture evenly on the surface of the base layer and compact it. Keep it at 60-70℃ until it is completely hardened to obtain the shield tunnel slag layer. Then, transfer the obtained material to a standard curing room with the temperature controlled at 20±2℃. After standard curing for 6-7 days, the final product is obtained.

9. The application of a road paving material using solid waste as aggregate as described in any one of claims 1 to 7 in urban park paving, residential community paving, commercial street paving, and industrial park paving.

Images