A fully recycled road structure based on construction solid waste and its preparation method

Abstract

The present invention relates to the field of road engineering structure and material research, and specifically to a fully recycled road structure based on construction solid waste and a preparation method thereof. The fully recycled road structure includes a recycled surface layer, a recycled stable gravel base layer, a recycled soil base layer, and a recycled permeable bonding layer connecting the various layers. Compared with the pavement structure of the prior art, the fully recycled road structure of the present invention completely replaces natural materials with materials such as construction solid waste and applies them to various layers of road structure materials, effectively solving problems such as resource consumption and environmental pollution during road construction. In addition, by providing a recycled bonding permeable layer, the various layers of road structure are bonded into an integral structure, thereby ensuring the durability and service life of the fully recycled road structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway engineering, and specifically relates to a fully recycled road structure based on construction solid waste and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization and the booming construction industry, the amount of construction waste generated is enormous and continues to increase year by year. This waste is primarily landfilled and simply piled up, lacking efficient resource utilization. Recycling rates are relatively low, leading to environmental pollution, resource waste, and safety hazards. Therefore, finding efficient and large-scale utilization of construction waste has become a key concern for both the government and researchers.

[0003] The road industry is both a foundational, pioneering, and service-oriented industry for national economic and social development, and a major consumer of resources and energy. As a key area for energy conservation and emission reduction, the use of construction solid waste in road projects has been steadily expanding in recent years. Especially in urban construction, the resource utilization of construction waste has become a key component in promoting the development of "waste-free cities." Recycled materials from construction waste are widely used in various applications, including roadbeds and pavements, effectively reducing the extraction and use of traditional materials, achieving resource recycling, and protecting the environment. For example, the Chengzhi section of Chengdu's Third Ring Road construction site used a large amount of recycled construction waste for paving. This not only solved the problem of construction waste disposal, but also reduced road construction costs and the use of natural resources, achieving a win-win situation for both economic and environmental benefits.

[0004] In order to apply construction solid waste in the field of road engineering, road workers have carried out a number of research works. For example, document CN212714350U discloses a low-grade road structure paved with multi-source solid waste, including a roadbed structure layer made of composite stabilized soil of industrial solid waste and soil solidifier laid in sequence on the foundation of the road embankment, a subbase made of graded construction waste stabilized with soil solidifier, a base made of graded construction waste stabilized with soil solidifier and cement, a lower layer and a middle surface layer paved with factory-mixed hot recycled asphalt mixture, and an overlay layer paved with high-viscosity modified asphalt mixture; wherein a penetration oil is spread on the base layer, and a tack coat oil is spread on the lower layer and the middle surface layer. This road structure only uses solid waste materials in some layers, and does not completely replace all road structure layers with construction solid waste materials. Therefore, it is not a truly fully recycled road structure. Specifically for recycled road structure materials, CN111205057A discloses a method for preparing pressure-formed bricks using construction debris, machine-made sand, waste gypsum, cement, curing agent and water, which can replace road bricks made of concrete materials. Documents CN115745540A, CN116768529A and CN115536350A respectively disclose solid waste road flexible base mixtures prepared using low-carbon cementitious materials, fly ash, steel slag, coal gangue, cement, construction solid waste mixed aggregates, asphalt and mineral powder, and their preparation methods. Documents CN110294943A and CN113173736A disclose methods for preparing asphalt regeneration agents and hot-regenerated asphalt mixtures using RAP materials, high-viscosity and high-glue modified asphalt, plasticizers, penetrants, stabilizers and anti-aging agents. The above literature considers the use of some solid waste materials to replace the soil base, base layer and surface layer materials of the road structure, which has a certain effect of turning waste into treasure and utilizing solid waste resources. However, there is still a certain gap compared with the utilization of all solid waste road materials.

[0005] The recycled road materials in the existing technology do not use 100% fully recycled road structure materials, so they cannot be defined as fully recycled road structures. In fact, in order to further respond to the country's goal of green and resource-efficient utilization of solid waste and promote large-scale utilization of construction solid waste, it is urgently necessary to invent a fully recycled road structure based on construction solid waste and its preparation method, so as to achieve 100% utilization of construction solid waste materials in the soil base, base and surface materials of the road structure. In addition, the bonding layer between each structural layer is also an important component of the recycled road structure, and it is also very important to consider the recycling and utilization of the recycled bonding layer. Summary of the Invention

[0006] Based on the problems existing in the prior art, the present invention proposes a fully recycled road structure based on construction solid waste and a preparation method thereof, which includes a recycled surface layer, a recycled stable gravel base layer, a recycled soil base layer and a recycled permeable bonding layer connecting the layers. It can realize the complete replacement of natural materials with construction solid waste materials in the various layers of road structure, effectively solving the problems of resource consumption and environmental pollution in the road construction process, and adapting to the current trend of technological development.

[0007] The technical solution adopted by the present invention is:

[0008] A fully recycled road structure based on construction solid waste comprises, from top to bottom, a recycled asphalt concrete surface layer (1), a recycled stabilized crushed stone base layer (3) and a recycled soil base layer (5), and further comprises:

[0009] An organic regenerated permeable bonding layer (2) for bonding a regenerated asphalt concrete surface layer (1) and a regenerated stabilized crushed stone base layer (3);

[0010] An inorganic regenerated permeable bonding layer (4) is used for bonding a regenerated stable crushed stone base (3) and a regenerated soil base (5).

[0011] Furthermore, the regenerated asphalt concrete surface layer (1) includes 2-3 layers of the regenerated asphalt concrete upper layer, the regenerated asphalt concrete middle layer, and the regenerated asphalt concrete lower layer from top to bottom, and the adjacent two layers are bonded by an organic regenerated permeable bonding layer; the regenerated stable crushed stone base layer (3) includes 2-3 layers of the regenerated stable crushed stone upper base layer, the regenerated stable crushed stone lower base layer, and the regenerated stable crushed stone bottom base layer from top to bottom, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer; the regenerated soil base layer (5) includes 1-2 layers of the regenerated soil base upper layer and the regenerated soil base lower layer from top to bottom, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer.

[0012] Furthermore, the regenerated asphalt concrete surface layer (1) includes any one or more of the following conditions:

[0013] A1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of demolished building structure concrete, abandoned dam concrete, demolished bridge concrete, and abandoned road asphalt concrete;

[0014] A2) The particle size range of the recycled coarse aggregate used includes three specifications: 4.75mm-9.5mm, 9.5mm-13.2mm, and 13.2mm-19mm;

[0015] A3) The high temperature crushing value of the recycled coarse aggregate used is less than 15%, and the admixture amount is 30% to 60%;

[0016] A4) The mineral powder used is recycled fine powder obtained by grinding waste concrete;

[0017] The binder used in A5) is asphalt binder recovered from waterproof coatings and / or waterproof roller curtains during building demolition.

[0018] Furthermore, the regenerated stable gravel base (3) includes any one or more of the following conditions:

[0019] B1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of concrete from demolished building structures, abandoned dam concrete, and demolished bridge concrete;

[0020] B2) The crushing value of the recycled coarse aggregate used is less than 28% and the water absorption rate is 3% to 8%;

[0021] B3) The amount of recycled coarse aggregate and recycled fine aggregate used is 30% to 100%;

[0022] B4) The inorganic binder used is recycled mortar powder and / or recycled red brick powder obtained by grinding waste concrete and then activating it at high temperature;

[0023] B5) The inorganic binder catalyst used is one or both of sodium fluorosilicate and sodium silicate.

[0024] Furthermore, the regenerated soil base layer (5) includes any one or more of the following conditions:

[0025] C1) The type of recycled soil base used is one or more of the following: spoil from tunnel excavation and / or high slope excavation, spoil from pile driver excavation, and silty soil from river channels;

[0026] C2) The curing agent used is a curing agent formed by atomic compounding of two or three of red mud, tailings slag powder and building recycled powder;

[0027] The amount of the curing agent in C3) is 3%-10% of the mass of the waste soil and slag used in the regenerated soil base.

[0028] Furthermore, the organic regenerated penetrating bonding layer (2) is obtained by compounding the recycled asphalt binder on the building demolition waterproof coating and / or waterproof roller curtain with waste engine oil and / or waste gear oil, and the total amount of waste engine oil and / or waste gear oil is 4%-10% of the mass of the recycled asphalt binder.

[0029] Furthermore, the inorganic regenerated permeable bonding layer (4) comprises building recycled micropowder, sodium fluorosilicate, sodium silicate and water, and the mass fractions thereof are as follows:

[0030] 15-30 parts of building recycled micro powder;

[0031] 1-3 parts of sodium fluorosilicate;

[0032] 1-5 parts of sodium silicate;

[0033] 5-12 parts water.

[0034] The present invention also provides a method for preparing a fully recycled road structure based on construction solid waste, comprising the following steps:

[0035] S1: Forming of regenerated soil base (5): using two or three of red mud, tailings slag powder and construction recycled powder to prepare a curing agent by atomic compounding, and evenly mixing the curing agent with one or more of spoil and slag from tunnel excavation and / or high slope excavation, spoil from pile driver excavation, and muddy soil from river channel in proportion, and forming the regenerated soil base by heavy compaction;

[0036] S2: Inorganic regenerated penetrating bonding layer (4) spraying: Use building recycled micro powder, sodium fluorosilicate, sodium silicate and water to prepare inorganic regenerated penetrating bonding layer material in proportion, and spray at 0.3-0.5kg / m 2 The amount is evenly sprayed on the regenerated soil base (5) to ensure the bonding stability between the regenerated soil base (5) and the regenerated stable crushed stone base (3);

[0037] S3: Forming of the regenerated stable crushed stone base (3): Regenerated coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of building structure demolition concrete, abandoned dam concrete and bridge demolition concrete, recycled mortar micropowder and / or recycled red brick micropowder obtained by grinding and high-temperature activation of abandoned concrete are used as inorganic binders, and an inorganic binder catalyst is mixed to obtain a regenerated stable crushed stone base mixture, which is formed on the inorganic regenerated permeable bonding layer (4) by a vibration molding method;

[0038] S4: Spreading of organic regenerated penetrating bonding layer (2): Prepare organic regenerated penetrating bonding layer material by mixing recycled asphalt binder from building demolition waterproof coating and waterproof roller curtain with waste engine oil and / or waste gear oil in proportion, and spread it evenly on the regenerated stable crushed stone base (3). The spreading amount is 0.4-0.7kg / m 2 , to ensure the bonding stability between the recycled stable crushed stone base layer (3) and the recycled asphalt concrete surface layer (1);

[0039] S5: Forming of recycled asphalt concrete surface layer (1): Recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of building structure demolition concrete, abandoned dam concrete, bridge demolition concrete and road waste asphalt concrete, recycled micro powder obtained by grinding waste concrete, and asphalt binder recovered from waterproof coating and / or waterproof roller curtain are designed into recycled asphalt concrete according to Marshall proportion design method, and are formed on the organic recycled permeable bonding layer (2) by static pressure forming method, so as to obtain a fully recycled road structure based on construction solid waste.

[0040] The beneficial effects of the present invention are as follows: fully recycled road structure, fully recycled road material, adhesive layer regeneration

[0041] (1) The present invention develops a new fully recycled road structure based on a fully recycled road structure of construction solid waste and a preparation method thereof. Compared with conventional road structures, the present invention realizes the recycling and utilization of all road structure layers, which is a truly fully recycled road structure and significantly reduces the construction cost of the road.

[0042] (2) The fully recycled road structure developed is made of recycled materials in all layers, which can completely replace natural materials with materials such as construction solid waste in the various layers of the road structure. The soil base is made of red mud, tailings powder, construction recycled powder, abandoned soil and slag, abandoned soil from pile driving, silty soil from rivers and other waste resources. The roadbed is made of crushed and screened coarse and fine aggregates from building structure demolition concrete, abandoned dam concrete, bridge demolition concrete, recycled mortar powder, recycled red brick powder, etc. The surface layer is made of crushed and screened coarse and fine aggregates from building structure demolition concrete, abandoned dam concrete, bridge demolition concrete and road waste asphalt concrete, recycled powder obtained by grinding abandoned concrete, and asphalt binder recovered from waterproof coatings and waterproof roller curtains. This effectively solves the problems of resource consumption and environmental pollution in the process of road construction.

[0043] (3) The fully recycled road structure based on construction solid waste also considers the use of recycled bonding layers between each layer. Inorganic recycled permeable bonding layer materials are used in the soil base layer and the base layer, and the interlayer bonding strength is not less than 0.3MPa; organic recycled permeable bonding layers are used between the surface layer and the base layer, and the interlayer bonding strength is not less than 0.5MPa, which effectively ensures the bonding performance between each layer and improves the structural performance and durability of the overall fully recycled road. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of a fully recycled road structure based on construction solid waste in Example 1 of the present invention;

[0045] Figure 2 The physical road structure diagram prepared in Example 3 of the present invention;

[0046] In the picture:

[0047] 1- Recycled asphalt concrete surface layer; 2- Organic recycle permeable bonding layer; 3- Recycled stabilized gravel base layer; 4- Inorganic recycle permeable bonding layer; 5- Recycled soil base layer. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be noted that the following examples are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0049] Example 1

[0050] like Figure 1 As shown, the present invention provides a schematic diagram of a fully recycled road structure based on construction solid waste, which includes, from top to bottom, a recycled asphalt concrete surface layer (1), a recycled stable crushed stone base layer (3), and a recycled soil base layer (5). In addition, it also includes: an organic recycled permeable bonding layer (2) for bonding the recycled asphalt concrete surface layer (1) and the recycled stable crushed stone base layer (3); and an inorganic recycled permeable bonding layer (4) for bonding the recycled stable crushed stone base layer (3) and the recycled soil base layer (5).

[0051] The regenerated asphalt concrete surface layer (1) includes two layers from top to bottom, namely, a regenerated asphalt concrete upper layer and a regenerated asphalt concrete lower layer, and the two adjacent layers are bonded by an organic regenerated permeable bonding layer; the regenerated stabilized gravel base layer (3) includes two layers from top to bottom, namely, a regenerated stabilized gravel upper base layer and a regenerated stabilized gravel bottom base layer, and the two adjacent layers are bonded by an inorganic regenerated permeable bonding layer; the regenerated soil base layer (5) is a regenerated soil base upper layer.

[0052] Recycled asphalt concrete surface layer (1) includes 5 of the following conditions:

[0053] A1) The types of recycled aggregate used are recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening concrete from demolished building structures and abandoned dam concrete;

[0054] A2) The particle size range of the recycled coarse aggregate used includes three specifications, namely 4.75mm-9.5mm, 9.5mm-13.2mm, and 13.2mm-19mm. The mass ratio of the three specifications of recycled coarse aggregate is 4.75mm-9.5mm:9.5mm-13.2mm:13.2mm-19mm = 1:2:2.

[0055] A3) The high temperature crushing value of the recycled coarse aggregate used is 12.3% and the admixture amount is 30%;

[0056] A4) The mineral powder used is recycled fine powder obtained by grinding waste concrete;

[0057] The binder used in A5) is asphalt binder recovered from waterproof coatings and waterproof roller curtains during building demolition.

[0058] Recycled stabilized crushed stone base (3) includes 5 of the following conditions:

[0059] B1) The types of recycled aggregate used are recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening concrete from demolished building structures and abandoned dam concrete;

[0060] B2) The crushing value of the recycled coarse aggregate used is 25% and the water absorption rate is 3%;

[0061] B3) The amount of recycled coarse aggregate and recycled fine aggregate used is 30%;

[0062] B4) The inorganic binder used is recycled mortar powder obtained by grinding waste concrete and then activating it at high temperature;

[0063] B5) The inorganic binder catalyst used is sodium fluorosilicate.

[0064] The regenerated soil base (5) includes three of the following conditions:

[0065] C1) The type of recycled soil base used is the spoil from tunnel excavation and high slope excavation;

[0066] C2) The curing agent used is a composite of red mud and tailings slag powder, with the mass ratio of red mud to tailings slag powder being 1:1;

[0067] The amount of the curing agent in C3) is 3% of the mass of the waste soil and slag used in the regenerated soil base.

[0068] The organic regenerated penetrating bonding layer (2) is obtained by compounding the recycled asphalt binder on the building demolition waterproof coating and waterproof roller curtain with waste engine oil and waste gear oil, and the total amount of the waste engine oil and waste gear oil is 4% of the mass of the recycled asphalt binder.

[0069] The inorganic regenerated permeable bonding layer (4) is composed of building recycled micro powder, sodium fluorosilicate, sodium silicate and water, and the mass fractions thereof are as follows:

[0070] 15 parts of building recycled micro powder;

[0071] 1 part of sodium fluorosilicate;

[0072] 1 part sodium silicate;

[0073] 5 parts water.

[0074] The preparation method of a fully recycled road structure based on construction solid waste comprises the following steps:

[0075] S1: Recycled soil base (5) molding: Red mud and tailings slag powder are used to prepare a curing agent by atomic compounding, with the mass ratio of red mud to tailings slag powder being 1:1; the curing agent is evenly mixed with the spoil from tunnel excavation and high slope excavation at a mass ratio of 3%, and the recycle soil base is molded by heavy compaction method, with the molding number of times being 50;

[0076] S2: Inorganic regenerated penetrating bonding layer (4) spraying: 15 parts of building recycled micro powder, 1 part of sodium fluorosilicate, 1 part of sodium silicate and 5 parts of water are used to prepare the inorganic regenerated penetrating bonding layer material in proportion, and the spraying is carried out at a rate of 0.3 kg / m 2 The amount is evenly sprayed on the regenerated soil base (5) to ensure the bonding stability between the regenerated soil base (5) and the regenerated stable crushed stone base (3);

[0077] S3: Recycled stable gravel base (3) forming: recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening the demolished concrete of the building structure and the abandoned dam concrete, recycled mortar powder obtained by grinding the abandoned concrete and activating it at high temperature are used as inorganic binder, and the inorganic binder catalyst sodium fluorosilicate is mixed to obtain a recycled stable gravel base mixture, which is formed on the inorganic recycled permeable bonding layer (4) by a vibration forming method; the recycled stable gravel base (3) includes two layers from top to bottom, namely, a recycled stable gravel upper base and a recycled stable gravel bottom base, and the two adjacent layers are bonded by the inorganic recycled permeable bonding layer;

[0078] S4: Spreading of organic regenerated penetrating bonding layer (2): The recycled asphalt binder from building demolition waterproof coating and waterproof roller curtain is mixed with waste engine oil and waste gear oil in proportion to prepare the organic regenerated penetrating bonding layer material. The total amount of waste engine oil and waste gear oil is 4% of the mass of the recycled asphalt binder. The organic regenerated penetrating bonding layer material is evenly spread on the regenerated stable crushed stone base (3) at a spreading amount of 0.4 kg / m 2 , to ensure the bonding stability between the recycled stable crushed stone base layer (3) and the recycled asphalt concrete surface layer (1);

[0079] S5: Forming of recycled asphalt concrete surface layer (1): recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening the demolished concrete of building structures and abandoned dam concrete, recycled micro powder obtained by grinding abandoned concrete, and asphalt binder recovered from waterproof coatings and waterproof roller curtains of building demolished buildings are designed into recycled asphalt concrete according to the Marshall proportion design method, and are formed on the organic recycled permeable bonding layer (2) by static pressure forming method. The recycled asphalt concrete surface layer (1) includes two layers from top to bottom, namely, the upper layer of recycled asphalt concrete and the lower layer of recycled asphalt concrete. The two adjacent layers are bonded by the organic recycled permeable bonding layer; thus, a fully recycled road structure based on construction solid waste is obtained.

[0080] Example 2

[0081] A fully recycled road structure based on construction solid waste comprises, from top to bottom, a recycled asphalt concrete surface layer (1), a recycled stable crushed stone base layer (3) and a recycled soil base layer (5), and further comprises an organic recycled permeable bonding layer (2) for bonding the recycled asphalt concrete surface layer (1) and the recycled stable crushed stone base layer (3); and an inorganic recycled permeable bonding layer (4) for bonding the recycled stable crushed stone base layer (3) and the recycled soil base layer (5).

[0082] The recycled asphalt concrete surface layer (1) includes three layers from top to bottom, namely, a recycled asphalt concrete upper layer, a recycled asphalt concrete middle layer, and a recycled asphalt concrete lower layer, and the adjacent layers are bonded by an organic recycled permeable bonding layer; the recycled stabilized gravel base layer (3) includes three layers from top to bottom, namely, a recycled stabilized gravel upper base layer, a recycled stabilized gravel lower base layer, and a recycled stabilized gravel bottom base layer, and the adjacent layers are bonded by an inorganic recycled permeable bonding layer; the recycled soil base layer (5) includes two layers from top to bottom, namely, a recycled soil base upper layer and a recycled soil base lower layer, and the adjacent layers are bonded by an inorganic recycled permeable bonding layer.

[0083] Recycled asphalt concrete surface layer (1) includes 5 of the following conditions:

[0084] A1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening concrete from demolished building structures, abandoned dam concrete, bridge demolished concrete, and abandoned road asphalt concrete;

[0085] A2) The particle size range of the recycled coarse aggregate used includes three specifications: 4.75mm-9.5mm, 9.5mm-13.2mm, and 13.2mm-19mm; the mass ratio of the three specifications of recycled coarse aggregate is 4.75mm-9.5mm:9.5mm-13.2mm:13.2mm-19mm = 1:2:3.

[0086] A3) The recycled coarse aggregate used has a high temperature crushing value of 10.5% and a content of 60 wt%;

[0087] A4) The mineral powder used is recycled fine powder obtained by grinding waste concrete;

[0088] The binder used in A5) is asphalt binder recovered from waterproof coatings and waterproof roller curtains during building demolition.

[0089] Recycled stabilized crushed stone base (3) includes 5 of the following conditions:

[0090] B1) The types of recycled aggregate used are recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening concrete from demolished building structures, abandoned dam concrete, and bridge demolished concrete;

[0091] B2) The crushing value of the recycled coarse aggregate used is 20.4% and the water absorption rate is 8%;

[0092] B3) The amount of recycled coarse aggregate and recycled fine aggregate used is 100wt% (i.e., all aggregates are recycled coarse aggregate and recycled fine aggregate);

[0093] B4) The inorganic binder used is recycled mortar powder and recycled red brick powder obtained by grinding waste concrete and then activating it at high temperature;

[0094] B5) The inorganic binder catalyst used is a combination of sodium fluorosilicate and sodium silicate, with the mass ratio of sodium fluorosilicate to sodium silicate being 1:1.

[0095] The regenerated soil base (5) includes three of the following conditions:

[0096] C1) The types of recycled soil base used are spoil from tunnel excavation and high slope excavation, spoil from pile driver excavation, and silty soil from river channels;

[0097] C2) The curing agent used is a curing agent formed by atomic compounding of red mud, tailings slag powder and construction recycled powder, with the mass ratio of red mud: tailings slag powder: construction recycled powder being 1:1:1;

[0098] The amount of the curing agent in C3) is 10% of the mass of the waste soil and slag used in the regenerated soil base.

[0099] The organic regenerated penetrating bonding layer (2) is obtained by compounding the recycled asphalt binder on the building demolition waterproof coating and waterproof roller curtain with waste engine oil and waste gear oil, and the total amount of the waste engine oil and waste gear oil is 10% of the mass of the recycled asphalt binder.

[0100] The inorganic regenerated permeable bonding layer (4) is composed of building recycled micro powder, sodium fluorosilicate, sodium silicate and water, and the mass fractions thereof are as follows:

[0101] 30 parts of building recycled micro powder;

[0102] 3 parts of sodium fluorosilicate;

[0103] 5 parts of sodium silicate;

[0104] 12 parts water.

[0105] The preparation method of a fully recycled road structure based on construction solid waste comprises the following steps:

[0106] S1: Forming of regenerated soil base (5): a curing agent is prepared by atomic compounding of red mud, tailings slag powder and construction recycled powder, with the mass ratio of red mud: tailings slag powder: construction recycled powder being 1:1:1; 10% by mass of the curing agent is evenly mixed with the spoils and slag from tunnel excavation and high slope excavation, the spoil from pile driver excavation and the silty soil from the river channel, and the regenerated soil base is formed by heavy compaction method, with the number of forming times being 50; the regenerated soil base (5) comprises two layers from top to bottom, namely, the upper regenerated soil base layer and the lower regenerated soil base layer, and the two adjacent layers are bonded by an inorganic regenerated permeable bonding layer;

[0107] S2: Inorganic regenerated penetrating bonding layer (4) spraying: 30 parts of building recycled micro powder, 3 parts of sodium fluorosilicate, 5 parts of sodium silicate and 12 parts of water are used to prepare the inorganic regenerated penetrating bonding layer material in proportion, and the spraying is carried out at a rate of 0.5 kg / m 2 The amount is evenly sprayed on the regenerated soil base (5) to ensure the bonding stability between the regenerated soil base (5) and the regenerated stable crushed stone base (3);

[0108] S3: Recycled stable gravel base (3) forming: recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening the demolished concrete of building structures, abandoned dam concrete and bridge demolished concrete, recycled mortar powder and recycled red brick powder obtained by grinding abandoned concrete and activating it at high temperature are used as inorganic binders, and an inorganic binder catalyst with a mass ratio of sodium fluorosilicate: sodium silicate = 1:1 is mixed to obtain a recycled stable gravel base mixture, which is formed on the inorganic recycled permeable bonding layer (4) by a vibration forming method; the recycled stable gravel base (3) includes three layers from top to bottom: a recycled stable gravel upper base, a recycled stable gravel lower base and a recycled stable gravel bottom base, and the adjacent two layers are bonded by the inorganic recycled permeable bonding layer;

[0109] S4: Spreading of organic regenerated penetrating bonding layer (2): The recycled asphalt binder from building demolition waterproof coating and waterproof roller curtain is mixed with waste engine oil and waste gear oil in proportion to prepare the organic regenerated penetrating bonding layer material. The total amount of waste engine oil and waste gear oil is 10% of the mass of the recycled asphalt binder. The organic regenerated penetrating bonding layer material is evenly spread on the regenerated stable crushed stone base (3) at a spreading amount of 0.7 kg / m 2 , to ensure the bonding stability between the recycled stable crushed stone base layer (3) and the recycled asphalt concrete surface layer (1);

[0110] S5: Recycled asphalt concrete surface layer (1) molding: recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening building structure demolition concrete, abandoned dam concrete, bridge demolition concrete and road waste asphalt concrete, recycled micro powder obtained by grinding abandoned concrete, and asphalt binder recovered from building demolition waterproof coating and waterproof roller curtain are designed according to the Marshall proportion design method to design recycled asphalt concrete, and are molded on the organic recycled permeable bonding layer (2) by static pressure molding method. The recycled asphalt concrete surface layer (1) includes three layers from top to bottom: recycled asphalt concrete upper layer, recycled asphalt concrete middle layer and recycled asphalt concrete lower layer. The adjacent two layers are bonded by the organic recycled permeable bonding layer; thus, a fully recycled road structure based on construction solid waste can be obtained.

[0111] Example 3

[0112] A fully recycled road structure based on construction solid waste comprises, from top to bottom, a recycled asphalt concrete surface layer (1), a recycled stable crushed stone base layer (3) and a recycled soil base layer (5), and further comprises: an organic recycled permeable bonding layer (2) for bonding the recycled asphalt concrete surface layer (1) and the recycled stable crushed stone base layer (3); and an inorganic recycled permeable bonding layer (4) for bonding the recycled stable crushed stone base layer (3) and the recycled soil base layer (5).

[0113] The regenerated asphalt concrete surface layer (1) includes three layers from top to bottom, namely, a regenerated asphalt concrete upper layer, a regenerated asphalt concrete middle layer, and a regenerated asphalt concrete lower layer, and the adjacent two layers are bonded by an organic regenerated permeable bonding layer; the regenerated stabilized gravel base layer (3) includes three layers from top to bottom, namely, a regenerated stabilized gravel upper base layer, a regenerated stabilized gravel lower base layer, and a regenerated stabilized gravel bottom base layer, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer; the regenerated soil base layer (5) includes two layers from top to bottom, namely, a regenerated soil base upper layer and a regenerated soil base lower layer, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer.

[0114] Recycled asphalt concrete surface layer (1) includes 5 of the following conditions:

[0115] A1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening waste asphalt concrete from roads;

[0116] A2) The particle size range of the recycled coarse aggregate used includes three specifications, namely 4.75mm~9.5mm, 9.5mm~13.2mm, and 13.2mm~19mm. The ratio of the three specifications of recycled coarse aggregate is 4.75mm~9.5mm:9.5mm~13.2mm:13.2mm~19mm=1:1:1.

[0117] A3) The recycled coarse aggregate used has a high temperature crushing value of 9.8% and a content of 50 wt%;

[0118] A4) The mineral powder used is recycled fine powder obtained by grinding waste concrete from building demolition;

[0119] The binder used in A5) is asphalt binder recovered from waterproof coatings and waterproof roller curtains during building demolition.

[0120] Recycled stabilized crushed stone base (3) includes 5 of the following conditions:

[0121] B1) The types of recycled aggregate used are recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening concrete from demolished building structures;

[0122] B2) The crushing value of the recycled coarse aggregate used is 20.4% and the water absorption rate is 5.4%;

[0123] B3) The amount of recycled coarse aggregate and fine aggregate used is 75wt%;

[0124] B4) The inorganic binder used is recycled mortar powder obtained by grinding waste concrete and then activating it at high temperature;

[0125] B5) The inorganic binder catalyst used is sodium silicate.

[0126] The regenerated soil base (5) includes three of the following conditions:

[0127] C1) The type of recycled soil base used is spoil excavated by pile drivers and silty soil from river channels;

[0128] C2) The curing agent used is a curing agent formed by atomic compounding of tailings slag powder and construction recycled powder, with the mass ratio of tailings slag powder to construction recycled powder being 2:1;

[0129] The amount of the curing agent in C3) is 8% of the mass of the waste soil and slag used in the regenerated soil base.

[0130] The organic regenerated penetrating bonding layer (2) is obtained by compounding the recycled asphalt binder on the building demolition waterproof coating and waterproof roller curtain with waste engine oil and waste gear oil, and the total amount of waste engine oil and waste gear oil is 7% of the mass of the recycled asphalt binder.

[0131] The inorganic regenerated permeable bonding layer (4) is composed of building recycled micro powder, sodium fluorosilicate, sodium silicate and water, and the mass fractions thereof are as follows:

[0132] 20 parts of building recycled micro powder;

[0133] 2 parts of sodium fluorosilicate;

[0134] 4 parts of sodium silicate;

[0135] 10 parts water.

[0136] A method for preparing a fully recycled road structure based on construction solid waste comprises the following steps:

[0137] S1: Forming of regenerated soil base (5): a curing agent is prepared by atomic compounding using tailings slag powder and construction recycled powder, with the mass ratio of tailings slag powder to construction recycled powder being 2:1. 8% by mass of the curing agent is mixed evenly with the spoil excavated by the pile driver and the muddy soil of the river channel, and the regenerated soil base is formed by heavy compaction method, with the number of forming times being 50. The regenerated soil base (5) comprises two layers from top to bottom: an upper regenerated soil base layer and a lower regenerated soil base layer, and the two adjacent layers are bonded by an inorganic regenerated permeable bonding layer.

[0138] S2: Inorganic regenerated penetrating bonding layer (4) spraying: 20 parts of building recycled micro powder, 2 parts of sodium fluorosilicate, 4 parts of sodium silicate and 10 parts of water are used to prepare the inorganic regenerated penetrating bonding layer material in proportion, and the spraying is carried out at a rate of 0.35 kg / m 2 The amount is evenly sprayed on the regenerated soil base (5) to ensure the bonding stability between the regenerated soil base (5) and the regenerated stable crushed stone base (3);

[0139] S3: Recycled stable gravel base (3) forming: recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening the demolished concrete of the building structure, recycled mortar powder obtained by grinding the waste concrete and activating it at high temperature, and sodium silicate inorganic binder catalyst are mixed to obtain a recycled stable gravel base mixture, which is then formed on the inorganic recycled permeable bonding layer (4) by a vibration forming method; the recycled stable gravel base (3) includes three layers from top to bottom: a recycled stable gravel upper base, a recycled stable gravel lower base, and a recycled stable gravel bottom base, and adjacent layers are bonded by an inorganic recycled permeable bonding layer;

[0140] S4: Spreading of organic regenerated penetrating bonding layer (2): The recycled asphalt binder from building demolition waterproof coating and waterproof curtain is mixed with waste engine oil and waste gear oil in proportion to prepare the organic regenerated penetrating bonding layer material. The total amount of waste engine oil and waste gear oil is 7% of the mass of the recycled asphalt binder. The organic regenerated penetrating bonding layer material is evenly spread on the regenerated stable crushed stone base (3) at a spreading amount of 0.5 kg / m 2 , to ensure the bonding stability between the recycled stable crushed stone base layer (3) and the recycled asphalt concrete surface layer (1);

[0141] S5: Recycled asphalt concrete surface layer (1) molding: recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening waste asphalt concrete from roads, recycled micro powder obtained by grinding waste concrete from building demolition, and asphalt binder recovered from waterproof coatings and waterproof roller curtains are designed into recycled asphalt concrete according to the Marshall proportion design method, and are molded on the organic recycled permeable bonding layer (2) by static pressure molding. The recycled asphalt concrete surface layer (1) includes three layers from top to bottom: recycled asphalt concrete upper layer, recycled asphalt concrete middle layer, and recycled asphalt concrete lower layer. The adjacent two layers are bonded by the organic recycled permeable bonding layer; thus, a fully recycled road structure based on construction solid waste can be obtained. The obtained physical road structure is as follows: Figure 2 shown.

[0142] In order to further verify the performance of the fully recycled road structure based on construction solid waste, performance tests were conducted on the structural layer materials and composite structural layers of Examples 1, 2, and 3. The test results are shown in Table 1.

[0143] Table 1 Performance test results of fully recycled road structures based on construction solid waste

[0144]

[0145] By testing the indicators of each layer of the fully recycled road structure based on construction solid waste, it was found that the indicators of the surface layer, base layer and bonding layer of the fully recycled road structure of the present invention can meet the technical requirements. The compaction degree of the recycled stable gravel base layer can reach up to 99%, the 28d unconfined compressive strength of the recycled stable gravel base layer can reach up to 7.2MPa, and the Marshall stability of the recycled asphalt concrete can reach up to 13.5KN. The performance of each layer of recycled concrete is comparable to that of ordinary concrete; in addition, the interlayer bonding strength between the recycled stable gravel base layer and the recycled soil base layer can reach 0.51MPa, and the interlayer bonding strength between the recycled asphalt concrete surface layer and the recycled stable gravel base layer can reach up to 0.77MPa, which is far superior to the current concrete material performance. Therefore, it has a significant effect on ensuring the bonding performance between the layers and improving the structural performance and durability of the overall fully recycled road. In addition, combined with the deflection value of the overall structure, the deflection value of the fully recycled road structure of construction solid waste also easily meets the technical index requirement of less than 20mm. Therefore, it can be said that the present invention has developed a new fully recycled road structure, which realizes the recycling and utilization of all road structure layers. It is a truly fully recycled road structure, which significantly reduces the construction cost of the road, and has significant economic and social benefits.

[0146] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fully recycled road structure based on construction solid waste, comprising, from top to bottom, a recycled asphalt concrete surface layer (1), a recycled stabilized crushed stone base layer (3) and a recycled soil base layer (5), characterized in that: Also includes: An organic regenerated permeable bonding layer (2) for bonding a regenerated asphalt concrete surface layer (1) and a regenerated stabilized crushed stone base layer (3); An inorganic regenerated permeable bonding layer (4) for bonding a regenerated stabilized crushed stone base (3) and a regenerated soil base (5); The organic regenerated permeable bonding layer (2) is obtained by compounding the recycled asphalt binder on the building demolition waterproof coating and / or waterproof roller curtain with waste engine oil and / or waste gear oil, and the total amount of waste engine oil and / or waste gear oil is 4%-10% of the mass of the recycled asphalt binder; The inorganic regenerated permeable bonding layer (4) comprises building recycled micropowder, sodium fluorosilicate, sodium silicate and water, and the mass fractions thereof are as follows: 15-30 parts of building recycled micro powder; 1-3 parts of sodium fluorosilicate; 1-5 parts of sodium silicate; 5-12 parts water.

2. The fully recycled road structure based on construction solid waste according to claim 1 is characterized in that: The regenerated asphalt concrete surface layer (1) includes, from top to bottom, 2-3 layers of a regenerated asphalt concrete upper layer, a regenerated asphalt concrete middle layer, and a regenerated asphalt concrete lower layer, and the adjacent two layers are bonded by an organic regenerated permeable bonding layer; the regenerated stable crushed stone base layer (3) includes, from top to bottom, 2-3 layers of a regenerated stable crushed stone upper base layer, a regenerated stable crushed stone lower base layer, and a regenerated stable crushed stone bottom base layer, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer; the regenerated soil base layer (5) includes, from top to bottom, 1-2 layers of a regenerated soil base upper layer and a regenerated soil base lower layer, and the adjacent two layers are bonded by an inorganic regenerated permeable bonding layer.

3. The fully recycled road structure based on construction solid waste according to claim 1 is characterized in that: The regenerated asphalt concrete surface layer (1) includes any one or more of the following conditions: A1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of the following: demolished building structure concrete, abandoned dam concrete, demolished bridge concrete, and abandoned road asphalt concrete; A2) The particle size range of the recycled coarse aggregate used includes three specifications: 4.75 mm to 9.5 mm, 9.5 mm to 13.2 mm, and 13.2 mm to 19 mm; A3) The high temperature crushing value of the recycled coarse aggregate used is less than 15%, and the dosage is 30%~60%; A4) The mineral powder used is recycled fine powder obtained by grinding waste concrete; A5) The binder used is asphalt binder recovered from waterproof coatings and / or waterproof roller curtains during building demolition.

4. The fully recycled road structure based on construction solid waste according to claim 1 is characterized in that: The regenerated stable gravel base (3) includes any one or more of the following conditions: B1) The recycled aggregate used is recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of the following: concrete from demolished building structures, concrete from abandoned dams, and concrete from demolished bridges; B2) The crushing value of the recycled coarse aggregate used is less than 28%, and the water absorption rate is 3%~8%; B3) The amount of recycled coarse aggregate and recycled fine aggregate used is 30%~100%; B4) The inorganic binder used is recycled mortar powder and / or recycled red brick powder obtained by grinding waste concrete and then activating it at high temperature; B5) The inorganic binder catalyst used is one or both of sodium fluorosilicate and sodium silicate.

5. The fully recycled road structure based on construction solid waste according to claim 1 is characterized in that: The regenerated soil base layer (5) includes any one or more of the following conditions: C1) The type of recycled soil base used is one or more of the following: spoil from tunnel excavation and / or high slope excavation, spoil from pile driver excavation, and silty soil from river channels; C2) The curing agent used is a curing agent formed by atomic compounding of two or three of red mud, tailings slag powder and construction recycled powder; C3) The dosage of the curing agent used is 3%-10% of the mass of the abandoned soil and slag used in the regenerated soil base.

6. The method for preparing a fully recycled road structure based on construction solid waste according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Recycled soil base (5) Forming: Use two or three of red mud, tailings slag powder and construction recycled powder to prepare a curing agent through atomic compounding, and evenly mix the curing agent with one or more of the spoil and slag from tunnel excavation and / or high slope excavation, spoil from pile driver excavation, and silty soil from river channels in proportion, and form the recycle soil base by heavy compaction; S2: Inorganic regenerated penetrating bonding layer (4) Spraying: Use building recycled micro powder, sodium fluorosilicate, sodium silicate and water to prepare inorganic regenerated penetrating bonding layer material in proportion, and spray at 0.3-0.5kg / m 2 The amount is evenly sprayed on the top of the regenerated soil base (5) to ensure the bonding stability between the regenerated soil base (5) and the regenerated stable crushed stone base (3); S3: Recycled stable crushed stone base (3) forming: Recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of building structure demolition concrete, abandoned dam concrete and bridge demolition concrete, recycled mortar micropowder and / or recycled red brick micropowder obtained by grinding abandoned concrete and activating it at high temperature are mixed as inorganic binder, and inorganic binder catalyst to obtain a recycled stable crushed stone base mixture, which is formed on the inorganic recycled permeable bonding layer (4) by vibration forming method; S4: Spreading of organic regenerated penetrating bonding layer (2): Prepare organic regenerated penetrating bonding layer material by mixing recycled asphalt binder from building demolition waterproof coating and waterproof roller curtain with waste engine oil and / or waste gear oil in proportion, and spread it evenly on the regenerated stable crushed stone base (3). The spreading amount is 0.4-0.7kg / m 2 , to ensure the bonding stability between the recycled stabilized crushed stone base layer (3) and the recycled asphalt concrete surface layer (1); S5: Recycled asphalt concrete surface layer (1) molding: Recycled coarse aggregate and recycled fine aggregate obtained by crushing and screening one or more of building structure demolition concrete, abandoned dam concrete, bridge demolition concrete and road waste asphalt concrete, recycled micro powder obtained by grinding waste concrete, and asphalt binder recovered from waterproof coating and / or waterproof roller curtain are designed into recycled asphalt concrete according to the Marshall proportion design method, and are molded on the organic recycled permeable bonding layer (2) by static pressure molding method to obtain a fully recycled road structure based on construction solid waste.

Images