CN110607726B

CN110607726B - Road building process of regenerative road surface structure

Info

Publication number: CN110607726B
Application number: CN201910930531.3A
Authority: CN
Inventors: 吴英彪; 石津金; 刘金艳; 董文红; 王秀稔; 曹军想; 张瑜; 董继业; 孟令宇; 李洪胜; 赵雯; 张培良; 代广越; 刘智
Original assignee: Cangzhou Municipal Engineering Co ltd
Current assignee: Cangzhou Municipal Engineering Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-06-23
Anticipated expiration: 2039-09-29
Also published as: CN110607726A

Abstract

The invention belongs to the technical field of road engineering, and particularly relates to a regenerative pavement structure and a road building process thereof. The invention can utilize the construction waste recycled material in a large scale and high value, the recycling rate of the construction waste is more than 95%, the utilization ratio of the recycled aggregate can reach 100%, the recycled material accounts for 80-90% in the whole pavement structure, the construction waste and other solid wastes are comprehensively recycled and simultaneously meet the requirements of relevant specifications, the recycled aggregate does not need to be degraded and utilized, the energy is saved, the emission is reduced, the environment is protected, the exploitation and consumption of new stones can be reduced, and the construction fund is saved.

Description

Road building process of regenerative road surface structure

Technical Field

The invention belongs to the technical field of road engineering, and particularly relates to a road building process of a regenerative road surface structure.

Background

With the acceleration of the urbanization process, the generation and discharge amount of construction waste is rapidly increased. According to statistics, the quantity of the building garbage generated in the urban construction process of China accounts for 40% of the total quantity of the urban garbage, and the urban garbage is increased year by year, so that the phenomenon of 'surrounding garbage' occurs in many places. The construction waste is solid waste with resource property, after resource treatment, more than 95% of the construction waste can be used as raw materials to be applied to engineering construction, and a sustainable development virtuous cycle is formed. In developed countries, the resource utilization rate of the construction waste reaches over 90 percent. While the resource utilization rate of the construction waste in China is less than 5 percent, and the comprehensive recycling of various construction wastes is less. Most of the construction waste is discarded or buried, which not only seriously pollutes the environment, but also causes great waste of resources. The resource utilization of the construction waste is a project with low carbon, environmental protection and sustainable development, the country has gradually paid attention to and strongly supported the development of the industry, and relevant policies have been successively issued in provinces and cities such as Beijing, Shanghai, Shandong and the like.

According to the technical standards for building waste treatment (CJJ/T134-2019), building waste is subjected to resource utilization according to components, materials such as soil, waste concrete, broken bricks and tiles, waste asphalt mixture and the like are precious resources capable of being recycled, and after treatment is carried out by adopting certain technical measures, a recycled material meeting certain technical requirements can be formed. The regenerative materials are applied to each structural layer of road engineering to form a green, low-carbon and sustainable-development full-thickness regenerative road engineering structure, so that the road construction is promoted to be transformed to a construction mode with low energy consumption and low emission.

Disclosure of Invention

The invention provides a road building process of a regenerative road surface structure, which has the characteristic of comprehensively recycling solid wastes such as construction wastes in a high-valued and large-scale manner.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a road building process of a regenerative pavement structure, which comprises a base layer and a surface layer, wherein the base layer comprises a cement-stabilized muck subbase layer, a cement-stabilized regenerative aggregate base layer and a foamed asphalt cold regenerative mixture flexible base layer which are arranged from bottom to top, and the surface layer comprises a warm-mixed regenerative asphalt mixture lower surface layer and a warm-mixed rubber asphalt mixture upper surface layer; the materials used for the cement-stabilized muck subbase layer comprise muck and cement, the materials used for the cement-stabilized recycled aggregate base layer comprise recycled aggregate and cement, the materials used for the foamed asphalt cold-recycled mixture flexible base layer comprise waste asphalt pavement recycled aggregate, new aggregate, foamed asphalt and cement, the materials used for the lower layer of the warm-mix recycled asphalt mixture comprise waste asphalt pavement recycled aggregate, new aggregate and new asphalt, and the materials used for the upper layer of the warm-mix rubber asphalt mixture comprise waste tire rubber powder, new asphalt, new aggregate and mineral powder;

the content of the muck in the cement stabilized muck subbase is 93-96 percent, and the content of the cement is 4-7 percent; the content of the recycled aggregate in the cement stabilized recycled aggregate base layer is 94-96 percent, and the content of the cement is 4-6 percent; the content of the recycled aggregate of the waste asphalt pavement in the flexible base layer of the foamed asphalt cold recycling mixture is 70-80%, the content of the new aggregate is 20-30%, the content of the foamed asphalt is 1.5-3.5%, and the content of the cement is 1-1.5%; the content of the waste asphalt pavement recycled aggregate in the lower surface layer of the warm-mix recycled asphalt mixture is 10-40%, the content of the new aggregate is 60-90%, and the content of the new asphalt is 3-6%; on the upper layer of the warm-mixed rubber asphalt mixture, the mixing amount of the waste tire rubber powder is 18 to 25 percent of that of the rubber asphalt, the oilstone ratio is 5.5 to 6.5 percent, and the mixing temperature is 140 to 160 ℃; the thickness range of the base layer is 50 cm-70 cm, and the thickness range of the surface layer is 10 cm-20 cm; the thickness of the cement stabilized muck subbase layer is 32cm, the thickness of the cement stabilized recycled aggregate base layer is 18cm, the thickness of the foamed asphalt cold recycled mixture flexible base layer is 12cm, the thickness of the warm-mixed recycled asphalt mixture lower layer is 8cm, and the thickness of the warm-mixed rubber asphalt mixture upper layer is 4 cm;

the road building process comprises the following steps:

step one, road bed treatment;

paving a cement-stabilized muck mixture on the road bed, rolling and compacting to form a cement-stabilized muck subbase layer, and maintaining until the unconfined compressive strength reaches at least 1.5MPa in 7 days;

paving a cement stabilized recycled aggregate mixture on the cement stabilized muck subbase layer, rolling and compacting to form a cement stabilized recycled aggregate base layer, spraying prime coat oil, and maintaining until the unconfined compressive strength reaches at least 3.0MPa in 7 days;

fourthly, paving a foamed asphalt cold recycling mixture on the cement stabilized recycled aggregate base layer, and rolling and compacting to form a foamed asphalt cold recycling mixture flexible base layer;

step five, spraying rubber asphalt on the upper surface of the flexible base layer of the foamed asphalt cold recycling mixture and spreading broken stones to form a lower seal layer;

laying a warm-mix recycled asphalt mixture on the lower seal layer, and rolling and compacting to form a warm-mix recycled asphalt mixture lower surface layer;

step seven, paving a warm-mixed rubber asphalt mixture on the lower surface layer of the warm-mixed regenerated asphalt mixture through paving equipment, and rolling and compacting to form an upper surface layer of the warm-mixed rubber asphalt mixture;

the second step and the third step are also preceded by the steps of crushing recycled aggregate, sampling test, screening recycled aggregate and mixing; if the thickness of the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer is more than 20cm, the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer with the thickness of more than 20cm are divided into two layers for paving;

the paving equipment used in the seventh step comprises a machine body, wherein a crawler device at the bottom of the machine body is used for driving the machine body to move; one side of the machine body is provided with an ironing device for flattening the asphalt mixture; one side of the machine body, which is far away from the ironing device, is hinged with a pair of hoppers for feeding; a connecting rod is obliquely arranged on the machine body at one side of the hopper, which is far away from the ironing device, and the middle part of the connecting rod is hinged with the machine body; one side of the connecting rod, which is far away from the machine body, is rotatably connected with a driving wheel, and the driving wheel is used for driving a transport vehicle for transporting the asphalt mixture to synchronously move with the paving equipment; a piston cylinder is hinged on the machine body on one side, away from the driving wheel, of the connecting rod, a piston is connected in the piston cylinder in a sliding mode, and a group of flow limiting holes are formed in the piston; a piston rod is fixedly connected to one side of the piston, which is far away from the bottom of the piston cylinder; a cylinder cover is arranged at one end of the piston cylinder, which is close to the piston rod, and the piston rod penetrates through the cylinder cover and is hinged with the connecting rod; damping liquid is filled in the piston cylinder; the piston slowly moves in the piston cylinder to avoid rigid collision between the transport vehicle and the engine body; the during operation, the transport vechicle that fills with bituminous mixture slowly backs a car and is close to the organism, when the transport vechicle rear wheel is close to the contact drive wheel, the transport vechicle stops backing a car, this moment the transport vechicle because inertia can continue to move a section distance, when the transport vechicle rear wheel contact drive wheel, the direction that is close to the organism removes to the drive wheel pressurized back, and then drive the connecting rod and rotate, the connecting rod drives the piston rod and then drives the piston and slide in the piston cylinder, damping liquid in the piston cylinder can only flow in the piston cylinder through the restricted aperture this moment, hinder the slip of piston, and then absorb the energy that the transport vechicle strikes the drive wheel, and then avoid transport vechic

The top of the hopper is provided with an oil injection pipe, and a group of nozzles are uniformly arranged on the oil injection pipe; the damping liquid is an anti-sticking agent; an oil inlet is formed in one end, close to the bottom, of the piston cylinder and is connected with an oil tank through a pipeline and a check valve, and an anti-sticking agent is filled in the oil tank; an oil outlet is formed in one end, close to the cylinder cover, of the piston cylinder, and the oil outlet one-way valve and the connecting pipe are communicated with the oil injection pipe; the nozzle sprays anti-sticking agent to prevent the asphalt mixture from adhering to the inner wall of the hopper; when the drive wheel drives the connecting rod, and then when driving the piston and sliding in the piston cylinder, the antiseize agent in the piston cylinder is extruded to the piston, absorb the energy of piston motion when partly antiseize agent flows through the restricted aperture this moment, another part flows through the oil-out, then flow into in the oil spout pipe through check valve and connecting pipe, spout the hopper inner wall through the spout at last, through organism removal time intermittent type promotion drive wheel, and then make the spout constantly spout antiseize agent, make the hopper inner wall scribble antiseize agent, prevent the bituminous mixture adhesion at the hopper inner wall, the influence efficiency that paving equipment spread bituminous mixture.

Preferably, the side wall and the bottom of the hopper are made of a whole steel plate in a bending mode, so that the splicing dead angle is eliminated, and the adhesion of the asphalt mixture to the inner wall of the hopper is further reduced; the outer side of the part with the largest bending curvature of the side wall of the hopper is provided with a heating pipe, and two ends of the heating pipe are respectively communicated with the oil injection pipe and the oil outlet; the temperature in the oil tank is maintained at 200 ℃; the high-temperature anti-sticking agent flows through the heating pipe, so that the temperature of the part with the maximum bending curvature of the side wall of the hopper is increased, and the adhesion of the asphalt mixture on the inner wall of the hopper is further reduced; the inside corners generated when a plurality of steel plates are welded and spliced are thoroughly eliminated through the side wall and the bottom of the hopper formed by bending the whole steel plate, so that the asphalt mixture smoothly slides down from the hopper, and the adhesion of the asphalt mixture on the inner wall of the hopper is reduced; meanwhile, the high-temperature anti-sticking agent flowing through the heating pipe can heat the part with the largest bending curvature of the side wall of the hopper, so that the fluidity of the asphalt mixture is increased, and the adhesion of the asphalt mixture on the inner wall of the hopper is further reduced.

Preferably, a reinforcing rib with a cross section in a shape like a Chinese character 'ji' is arranged at the position, corresponding to the heating pipe, on the outer side of the hopper, and the reinforcing rib is used for increasing the strength of the side wall of the hopper; the heating pipe is sleeved inside the reinforcing rib, and the reinforcing rib is utilized to reduce the damage to the heating pipe; can increase the intensity of hopper through the strengthening rib, make the hopper warp the damage when piling up too much bituminous mixture in the reduction hopper, through with the heating pipe cover inside the strengthening rib, improved the protection intensity to the heating pipe, reduce the heating pipe because of the deformation or reveal that external force collision arouses, reduce the heating efficiency to the hopper.

Preferably, the gap between the reinforcing rib and the heating pipe is filled with heat-conducting silicone grease, and the heat-conducting silicone grease further increases the heating capacity of the heating pipe on the side wall of the hopper and further reduces the adhesion of the asphalt mixture on the inner wall of the hopper; the heat conduction silicone grease can increase the contact area between the heating pipe and the hopper, further improve the heat transfer efficiency, ensure the quick temperature rise of the hopper and further reduce the adhesion of the asphalt mixture on the inner wall of the hopper.

Preferably, an arc-shaped vibration cavity is arranged on a pipeline between the heating pipe and the oil injection pipe, the center of the vibration cavity is rotatably connected with a water wheel, and an arc-shaped notch is formed in a roller in the middle of the water wheel; a guide plate for guiding the anti-sticking agent is arranged at the bottom of the vibration cavity; the anti-sticking agent pushes the water wheel to rotate to generate vibration, so that the adhesion of the asphalt mixture on the inner wall of the hopper is further reduced; when the anti-sticking agent flows through the vibration cavity, the anti-sticking agent pushes the water wheel to rotate, and the grooving is arranged on the roller at the middle part of the water wheel, so that the water wheel forms an eccentric wheel, the water wheel generates vibration in the rotation process, the vibration is transmitted to the feeding hopper through the vibration cavity, the hopper generates vibration, and the adhesion of the asphalt mixture to the inner wall of the hopper is further reduced.

The invention has the following beneficial effects:

1. according to the road building process of the regenerative pavement structure, materials are reasonably selected and distributed on each layer, so that the materials of each layer can exert the performance advantages, the anti-skid and wear-resistant performances of the surface layer and the durability of the base layer are greatly enhanced; meanwhile, each layer uses solid waste materials such as construction waste and the like in a large proportion, the overall road building cost is reduced, and the construction waste recycled materials can be utilized in a large scale and in a high-value mode.

2. According to the road building process of the regenerative road surface structure, when the rear wheel of the transport vehicle contacts the driving wheel, the driving wheel is pressed to drive the piston to slide in the piston cylinder, and at the moment, damping liquid in the piston cylinder can only flow in the piston cylinder through the flow limiting hole to block the sliding of the piston, so that the energy of the transport vehicle impacting the driving wheel is absorbed, the transport vehicle is prevented from rigidly colliding with a machine body, the machine body is prevented from being damaged, and the service life of the driving wheel is prolonged.

3. According to the road building process of the regenerative road surface structure, when the piston slides in the piston cylinder, the piston extrudes the anti-sticking agent in the piston cylinder, one part of the anti-sticking agent absorbs the motion energy of the piston when flowing through the flow limiting hole, the other part of the anti-sticking agent flows out through the oil outlet, then flows into the oil injection pipe through the one-way valve and the connecting pipe, and finally is sprayed to the inner wall of the hopper through the nozzle, so that the asphalt mixture is prevented from being adhered to the inner wall of the hopper, and the efficiency of paving the asphalt mixture by paving equipment

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a graph of the particle size distribution of the cement stabilized muck subsoil of the present invention;

FIG. 2 is a flow diagram of the road construction process of the present invention;

FIG. 3 is a perspective view of a paving apparatus used in the present invention;

FIG. 4 is an elevation view of a paving apparatus used in the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial enlarged view of FIG. 4 at B;

in the figure: the device comprises a machine body 1, a crawler device 11, an ironing device 12, a hopper 2, a connecting rod 21, a driving wheel 22, a piston cylinder 23, a piston 24, a flow limiting hole 25, a piston rod 26, an oil spraying pipe 3, a nozzle 31, an oil inlet 27, an oil outlet 28, a heating pipe 32, a reinforcing rib 33, a vibration cavity 34, a water wheel 35, a roller 36, a groove 37 and a guide plate 38.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 6, the road construction process of the regenerative road surface structure comprises a base layer and a surface layer, wherein the base layer comprises a cement-stabilized muck subbase layer, a cement-stabilized recycled aggregate base layer and a foamed asphalt cold recycled mixture flexible base layer which are arranged from bottom to top, and the surface layer comprises a warm-mixed recycled asphalt mixture lower surface layer and a warm-mixed rubber asphalt mixture upper surface layer; the materials used for the cement-stabilized muck subbase layer comprise muck and cement, the materials used for the cement-stabilized recycled aggregate base layer comprise recycled aggregate and cement, the materials used for the foamed asphalt cold-recycled mixture flexible base layer comprise waste asphalt pavement recycled aggregate, new aggregate, foamed asphalt and cement, the materials used for the lower layer of the warm-mix recycled asphalt mixture comprise waste asphalt pavement recycled aggregate, new aggregate and new asphalt, and the materials used for the upper layer of the warm-mix rubber asphalt mixture comprise waste tire rubber powder, new asphalt, new aggregate and mineral powder;

the cement stabilized muck is a material prepared by mixing cement serving as a cementing material by a plant mixing method. The cement stabilized muck serving as the subbase layer of the road structure has unconfined compressive strength for 7 days, and the unconfined compressive strength meets the design requirement.

The residue soil in the cement stabilized residue soil is a substance mixed by soil, mortar and fine granules separated in the processes of pre-screening, screening and the like of the brick-concrete building garbage. Through sampling, detecting and analyzing a large number of samples, the muck belongs to the category of coarse-grained soil in the engineering classification of soil, the content of particles smaller than 0.6mm is less than 30%, the liquid limit is less than 40%, the plasticity index is not more than 17, and the muck can be stabilized by adopting cement or lime.

The recycled aggregate in the cement stabilized recycled aggregate is the aggregate which is formed after the treatment of crushing, screening and the like of the brick and concrete building garbage and meets the requirements of certain particle size and gradation. The cement stabilized recycled aggregate is a material which is formed by adopting cement as a cementing material and uniformly mixing the cement with recycled aggregates with different particle sizes according to a certain mixing proportion and meets certain technical requirements. The cement stabilized recycled aggregate serving as a base layer of a road structure has unconfined compressive strength for 7 days which meets the design requirement.

The foamed asphalt cold-recycling mixture is prepared by taking foamed asphalt as a cementing material, mixing the recycled RAP with aggregate, active filler and water at normal temperature in a high mixing ratio by adopting a plant mixing process, and paving the mixture on a traditional semi-rigid base layer at normal temperature to form a flexible base layer. Aggregate refers to virgin, non-recycled aggregate. The mixing of the materials used for the flexible base layer of the cold-recycling mixture of the foamed asphalt is to put the recycled aggregate of the waste asphalt pavement, the aggregate, the foamed asphalt and the cement together into a mixing bin for mixing, wherein the cement is mainly used as a filler, and the aggregate is combined together by the foamed asphalt.

The warm recycled asphalt mixture is prepared by conveying the asphalt pavement recycling materials in the construction waste to an asphalt mixing plant (field, station), crushing, screening, mixing with aggregates, asphalt, a regenerant (if necessary) and the like in a certain proportion by a warm mixing process. The foamed asphalt warm-recycling mixture is a technology combining a plant-mixing hot recycling technology of an asphalt pavement and a foamed asphalt warm-mixing technology. The mixing construction temperature of the recycled mixture is reduced by adopting a foamed asphalt warm mixing method, so that the emission of asphalt smoke and harmful gas is obviously reduced, and the working environment is improved.

The rubber asphalt in the warm-mixed rubber asphalt mixture is an asphalt product which is prepared by adding waste tire rubber powder serving as an asphalt modifier into common road petroleum asphalt and performing high-temperature reaction. The warm-mixed rubber asphalt mixture is prepared by mixing rubber asphalt serving as a cementing material with aggregates, mineral powder and the like with a certain specification by a warm-mixing process. The mixing amount of the waste tire rubber powder in the rubber asphalt is 18-25% of the mass of the asphalt. The warm-mixed rubber asphalt mixture is prepared by foaming rubber asphalt, and uniformly mixing the foamed rubber asphalt serving as a cementing material with aggregate, filler and the like. The warm-mixed rubber asphalt mixture reduces the mixing construction temperature by 20-30 ℃, remarkably reduces the emission of asphalt smoke and harmful gases, improves the operation environment, and is a novel pavement surface material which is more energy-saving and environment-friendly than the prior art.

The content of the muck in the cement stabilized muck subbase is 93-96 percent, and the content of the cement is 4-7 percent; the content of the recycled aggregate in the cement stabilized recycled aggregate base layer is 94-96 percent, and the content of the cement is 4-6 percent; the content of the recycled aggregate of the waste asphalt pavement in the flexible base layer of the foamed asphalt cold recycling mixture is 70-80%, the content of the new aggregate is 20-30%, the content of the foamed asphalt is 1.5-3.5%, and the content of the cement is 1-1.5%; the content of the waste asphalt pavement recycled aggregate in the lower surface layer of the warm-mix recycled asphalt mixture is 10-40%, the content of the new aggregate is 60-90%, and the content of the new asphalt is 3-6%; on the upper layer of the warm-mixed rubber asphalt mixture, the mixing amount of the waste tire rubber powder is 18 to 25 percent of that of the rubber asphalt, the oilstone ratio is 5.5 to 6.5 percent, and the mixing temperature is 140 to 160 ℃; the thickness range of the base layer is 50 cm-70 cm, and the thickness range of the surface layer is 10 cm-20 cm; the thickness of the cement stabilized muck subbase layer is 32cm, the thickness of the cement stabilized recycled aggregate base layer is 18cm, the thickness of the foamed asphalt cold recycled mixture flexible base layer is 12cm, the thickness of the warm-mixed recycled asphalt mixture lower layer is 8cm, and the thickness of the warm-mixed rubber asphalt mixture upper layer is 4 cm.

The road building process comprises the following steps:

step one, road bed treatment;

the second step and the third step are also preceded by the steps of crushing recycled aggregate, sampling test, screening recycled aggregate and mixing; and if the thickness of the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer is more than 20cm, the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer with the thickness of more than 20cm are divided into two layers for paving.

In practical application, the cement-stabilized muck is used as a road structure subbase layer, the cement-stabilized recycled aggregate is used as a road structure base layer, the foamed asphalt cold recycled mixture is used as a flexible base layer of the road structure, the warm recycled asphalt mixture is used as a middle lower layer of the road structure, and the warm-mixed rubber asphalt mixture is used as an upper layer of the road structure.

The cementing material of the inorganic binder stabilizing material in the base material is mainly cement, and for different traffic volumes and road grades, other inorganic binders such as fly ash and lime can be used as the cementing material, and whether the unconfined compressive strength of 7 days can be met or not is taken as a main design index when the mix proportion of the inorganic binder is designed. The invention only provides a relatively typical regenerative pavement structure, and the regeneration utilization rate of the construction waste can reach more than 95%.

The construction waste is a precious resource which can be recycled, and the waste asphalt mixture, the residue soil in the construction waste mixed material and the brick-concrete construction waste are treated by adopting certain technical measures to form a recycled material meeting certain technical requirements. The regenerative materials can be applied to various structural layers of road engineering to form a novel regenerative road engineering structure which is green, low-carbon and sustainable in development, so that the road construction is promoted to be transformed to a construction mode with low energy consumption and low emission. The invention can lead the regeneration utilization rate of the construction waste to reach more than 95 percent, the utilization ratio of the regenerated aggregate to reach 100 percent, and the proportion of the regenerated material in the whole pavement structure to reach 80 to 90 percent, thereby having extremely high ecological and social benefits.

The paving equipment used in the seventh step comprises a machine body 1, wherein a crawler device 11 at the bottom of the machine body 1 is used for driving the machine body 1 to move; one side of the machine body 1 is provided with an ironing device 12 for flattening the asphalt mixture; a pair of hoppers 2 for feeding are hinged to one side of the machine body 1, which is far away from the ironing device 12; a connecting rod 21 is obliquely arranged on the machine body 1 at one side of the hopper 2 far away from the ironing device 12, and the middle part of the connecting rod 21 is hinged with the machine body 1; one side of the connecting rod 21, which is far away from the machine body 1, is rotatably connected with a driving wheel 22, and the driving wheel 22 is used for driving a transport vehicle for transporting the asphalt mixture to synchronously move with the paving equipment; a piston cylinder 23 is hinged on the machine body 1 on one side of the connecting rod 21, which is far away from the driving wheel 22, a piston 24 is connected in the piston cylinder 23 in a sliding manner, and a group of restricted holes 25 are formed in the piston 24; a piston rod 26 is fixedly connected to one side of the piston 24, which is far away from the bottom of the piston cylinder 23; a cylinder cover is arranged at one end of the piston cylinder 23 close to the piston rod 26, and the piston rod 26 penetrates through the cylinder cover and then is hinged with the connecting rod 21; damping liquid is filled in the piston cylinder 23; the piston 24 slowly moves in the piston cylinder 23 to avoid the rigid collision of the transport vehicle and the machine body 1; the during operation, the transport vechicle that fills up bituminous mixture slowly backs a car and is close to organism 1, when the transport vechicle rear wheel is close to contact drive wheel 22, the transport vechicle stops backing a car, this moment the transport vechicle because inertia can continue to move a section distance, when transport vechicle rear wheel contact drive wheel 22, the direction that is close to organism 1 removes to drive wheel 22 pressurized, and then drive connecting rod 21 rotates, connecting rod 21 drives piston rod 26 and then drives piston 24 and slide in piston cylinder 23, damping liquid in the piston cylinder 23 can only flow in piston cylinder 23 through restricted aperture 25 this moment, hinder piston 24's slip, and then absorb the energy that the transport vechicle strikes drive wheel 22, and then avoid transport vechicle and organism 1 rigid collision, damage organism 1, prolong drive wheel 22's life.

The top of the hopper 2 is provided with an oil injection pipe 3, and the oil injection pipe 3 is uniformly provided with a group of nozzles 31; the damping liquid is an anti-sticking agent; an oil inlet 27 is formed in one end, close to the bottom, of the piston cylinder 23, the oil inlet 27 is connected with an oil tank through a pipeline and a one-way valve, and an anti-sticking agent is filled in the oil tank; an oil outlet 28 is formed in one end, close to the cylinder cover, of the piston cylinder 23, and a check valve and a connecting pipe of the oil outlet 28 are communicated with the oil injection pipe 3; the spout 31 sprays anti-sticking agent to prevent the asphalt mixture from adhering to the inner wall of the hopper 2; when the driving wheel 22 drives the connecting rod 21 and further drives the piston 24 to slide in the piston cylinder 23, the piston 24 extrudes the anti-sticking agent in the piston cylinder 23, at the moment, a part of the anti-sticking agent absorbs the energy of the movement of the piston 24 when flowing through the restricted aperture 25, the other part of the anti-sticking agent flows out through the oil outlet 28, then flows into the oil injection pipe 3 through the check valve and the connecting pipe, and finally is sprayed to the inner wall of the hopper 2 through the nozzle 31, the driving wheel 22 is intermittently pushed through the movement time of the machine body 1, so that the nozzle 31 continuously sprays the anti-sticking agent, the inner wall of the hopper 2 is fully coated with the anti-sticking agent, the adhesion of the asphalt mixture.

As an implementation mode of the invention, the side wall and the bottom of the hopper 2 are made of a whole steel plate by bending, so that the splicing dead angle is eliminated, and the adhesion of the asphalt mixture on the inner wall of the hopper 2 is further reduced; a heating pipe 32 is arranged on the outer side of the position with the largest bending curvature of the side wall of the hopper 2, and two ends of the heating pipe 32 are respectively communicated with the oil injection pipe 3 and the oil outlet 28; the temperature in the oil tank is maintained at 200 ℃; the high-temperature anti-sticking agent flows through the heating pipe 32, so that the temperature of the part with the largest bending curvature of the side wall of the hopper 2 is increased, and the adhesion of the asphalt mixture on the inner wall of the hopper 2 is further reduced; the side wall and the bottom of the hopper 2 are formed by bending the whole steel plate, so that internal corners generated when a plurality of steel plates are welded and spliced are thoroughly eliminated, the asphalt mixture smoothly slides down from the hopper 2, and the adhesion of the asphalt mixture to the inner wall of the hopper 2 is reduced; meanwhile, the high-temperature anti-sticking agent flowing through the heating pipe 32 can heat the part with the largest bending curvature of the side wall of the hopper 2, so that the fluidity of the asphalt mixture is increased, and the adhesion of the asphalt mixture on the inner wall of the hopper 2 is further reduced.

As an embodiment of the present invention, a reinforcing rib 33 with a cross section shaped like a Chinese character 'ji' is disposed at a position corresponding to the heating pipe 32 outside the hopper 2, and the reinforcing rib 33 is used for increasing the strength of the side wall of the hopper 2; the heating pipe 32 is sleeved inside the reinforcing rib 33, and the reinforcing rib 33 is utilized to reduce the damage to the heating pipe 32; can increase the intensity of hopper 2 through strengthening rib 33, make hopper 2 warp the damage when piling up too much bituminous mixture in reducing hopper 2, through with heating pipe 32 cover inside strengthening rib 33, improved the protection intensity to heating pipe 32, reduce the heating pipe 32 because of the deformation or reveal that external force collision arouses, reduce the heating efficiency to hopper 2.

As an embodiment of the present invention, a gap between the reinforcing rib 33 and the heating pipe 32 is filled with heat-conducting silicone grease, which further increases the heating capacity of the heating pipe 32 on the sidewall of the hopper 2, and further reduces the adhesion of the asphalt mixture to the inner wall of the hopper 2; the heat conduction silicone grease can increase the contact area between the heating pipe 32 and the hopper 2, further improve the heat transfer efficiency, ensure the quick temperature rise of the hopper 2 and further reduce the adhesion of the asphalt mixture on the inner wall of the hopper 2.

As an embodiment of the present invention, an arc-shaped vibration cavity 34 is disposed on a pipeline between the heating pipe 32 and the oil spray pipe 3, a water wheel 35 is rotatably connected to the center of the vibration cavity 34, and an arc-shaped slot 37 is disposed on a roller 36 in the middle of the water wheel 35; a guide plate 38 for guiding the anti-sticking agent is arranged at the bottom of the vibration cavity 34; the anti-sticking agent pushes the water wheel 35 to rotate to generate vibration, so that the adhesion of the asphalt mixture on the inner wall of the hopper 2 is further reduced; when the anti-sticking agent flows through vibration chamber 34, anti-sticking agent promotes water wheels 35 rotatory, because seted up fluting 37 on the roller 36 at water wheels 35 middle part for water wheels 35 form the eccentric wheel, and water wheels 35 rotates the in-process and produces the vibration, and the vibration passes through vibration chamber 34 and transmits for hopper 2, and then makes hopper 2 produce the vibration, further reduces the bituminous mixture adhesion at hopper 2 inner wall.

The present invention will be described in further detail with reference to examples.

The first embodiment is as follows:

the designed road surface structure of a traffic lane of a certain urban road is as follows: after the treatment of the roadbed 100, a cement stabilized muck subbase layer with the thickness of 32cm (the unconfined compressive strength of 7 days is 1.5-2.5 MPa), a cement stabilized recycled aggregate base layer with the thickness of 18cm (the unconfined compressive strength of 7 days is 3.0-4.0 MPa) are sequentially paved on the roadbed 100, the penetrating layer oil is sprayed, a foamed asphalt cold recycled mixture with the thickness of 12cm is paved, the rubber asphalt is sprayed, meanwhile, the broken stone is spread to form a lower seal layer, a foamed asphalt warm recycled mixture lower surface layer with the thickness of 8cm is paved, and a foamed asphalt warm mixed rubber asphalt upper surface layer with the thickness of 4cm is paved.

1 cement stabilized muck subbase mix proportion design and production construction process

1.1 Cement stabilized muck sub-base mix proportion design

The variability of the dregs is eliminated by adopting a certain technical measure, samples of different material piles are selected by a loader to be stacked together during sampling, the samples are continuously turned over and shoveled and mixed, and sample materials are selected according to sampling standards after being uniformly mixed.

The selected sample is subjected to index analysis such as water content, liquid limit, plastic limit, plasticity index, particle composition and the like, and the indexes such as organic matter content, sulfate content and the like of the muck need to be analyzed if necessary, wherein the indexes need to meet the quality requirement of cement stabilized soil base raw materials in the urban road engineering construction and quality acceptance standard, and the muck which does not meet the requirement can be used after being processed.

The particle size distribution curve of the soil is shown in the attached figure 1:

the results were: the residue soil is fine-grained soil Sand (SF) in coarse-grained soil, the water content is 13.1%, the liquid limit is 27.7%, the plastic limit is 21.7%, the plasticity index is 6, the nonuniform coefficient Cu is 45, the curvature coefficient Cc is 1.0, and the particle range of the residue soil as a subbase completely meets the grading requirement of cement stabilized soil.

Through test detection, the content of organic matters in the residue soil is 1.73 percent and is lower than the index of 2 percent; the content of sulfate is 0.225 percent and is lower than the index of 0.25 percent, and the sulfate is used as a cement stabilized soil material without treatment.

The cement stabilized muck 7d compressive strength is not lower than 1.5MPa as a standard, cement stabilized muck mixing proportion design is carried out by using cement dosages of 3%, 4%, 5%, 6% and 7%, experimental analysis shows that the cement dosage of 5% stabilized muck 7d compressive strength 2.2MPa meets the requirement, 5% is taken as the optimal cement dosage, and performance test is carried out by using a gradient of 0.5%, namely the cement dosages of 4.5%, 5% and 5.5%.

Unconfined compressive strength results:

results of anti-scour performance:

and (3) freeze-thaw cycle results:

cleavage strength results: the cement dosage of 4.5 percent, 5 percent and 5.5 percent cement stabilized muck 90d have average fracture strength of 0.32MPa, 0.44MPa and 0.69MPa respectively.

Compression rebound modulus results: the average values of the compression-resistant modulus and the resilience modulus of 90d of cement stabilized muck with 4.5 percent, 5 percent and 5.5 percent of cement are 766MPa, 826MPa and 934MPa respectively.

The cement stabilized soil material with the indexes meeting the standard requirements is used for road subbase. And finally determining the cement dosage of the cement stabilized muck to be 5% by considering the principle of meeting the strength requirement and the economic optimization.

1.2 Cement stabilized muck production construction process

The cement stabilized muck is produced and mixed by adopting a plant mixing method, the mixing amount of the cement is increased by 0.5 percent compared with the test dosage, and the dosage of the cement and the mixing water consumption are strictly controlled.

The quality of the construction processes of paving, rolling and the like of the cement stabilized muck is controlled, the cement stabilized material road subbase acceptance standard is met, and the loose paving coefficient is preferably controlled to be 1.35-1.53.

The combination of field rolling is as follows: the method comprises the steps of adopting a 12t rubber-tyred roller to perform preliminary stable rolling for 1-2 times, using a 20t vibratory roller to perform vibratory compaction for 2-3 times after the mixture is preliminarily stabilized, and finally using a 22t three-wheeled roller to perform rolling for 2-3 times until the surface is smooth and has no wheel marks.

And a watering curing mode is adopted, so that the surface of the cement stabilized muck layer is always wet during curing.

1.3 quality inspection

The maximum dry density of field sampling and compaction is 1.823g/cm³The degree of compaction is above 95%.

And after curing for 7d, the average strength of the front field sampling molding test piece is 2.18 MPa.

After 7d of maintenance, deflection detection is carried out on each lane according to one measuring point of every 20m, the maximum deflection value of the cement-stabilized muck structure layer is 0.62mm, the deflection representative value is 0.53mm, and the deflection representative value is obviously lower than that of the similar limestone soil subbase layer.

2 cement stabilized recycled aggregate base layer mix proportion design and production construction process

The concrete crushed materials in the recycled construction waste are further crushed and screened to form recycled aggregate, impurities such as reinforcing steel bars in the recycled aggregate are removed, and the recycled aggregate is stacked according to different sources.

The variability of the recycled aggregate is eliminated by adopting a certain technical measure, samples of different material piles are selected by a loader to be stacked together during sampling, the samples are continuously turned and shoveled and mixed, and sample materials are selected according to sampling standards after being uniformly mixed.

The proportion design test of the cement-stabilized concrete crushing material adopts the gradation required by the technical Specification for highway pavement base course construction (JTJ 034-2000). The concrete crushing material and the stone chips with the thickness of 0-5mm are mixed according to the proportion of 90: 10. And after the grading is determined, carrying out a heavy compaction test according to requirements, and manufacturing an unconfined test piece according to the compaction result and the compaction degree of 97%. And (5) carrying out standard health preservation for 6 days, soaking for 24 hours, carrying out an unconfined compressive strength test, and determining the mixing proportion of the mixture according to the test result and the standard requirement.

Screening results of the recycled aggregate:

screen hole (mm)	31.5	26.6	19	9.6	4.77	2.33	0.6	0.0075
									Passage Rate (%)	100.2	91.2	78.3	50.4	34.8	26.9	13.3	1.5

And (3) screening and calculating results of the cement stabilized recycled aggregate:

screen hole (mm)	31.3	26.6	19	9.8	4.77	2.36	0.6	0.075
									Grading range	100-100	90-100	72-88	47-67	29-50	17-36	8-21	0-7
Median value	100	94	81.5	56.5	39.6	26.1	15.1	3.4
									Composition grading	100	90.8	81.1	54.3	42.0	30.3	15.5	2.2

Heavy duty compaction test results:

cement dosage (%)	Optimum water content	Maximum dry density
			4.0％	5.1	2.108
4.5％	5.4	2.170
			5.0％	6.1	2.231

Unconfined compressive strength test results:

considering both strength and economy, a cement dosage of 4.5% is used with reference to construction and production requirements.

The production and construction process of the cement stabilized recycled aggregate refers to the production and construction process of cement stabilized macadam.

3 foam asphalt cold-recycling mixture mix proportion design and production construction process

3.1 mix proportion design of foamed asphalt cold-recycling mixture

According to the grading design range requirement of highway asphalt pavement regeneration technical specification JTGF41-2008, the blending proportion of the recycled asphalt pavement material is determined to be 75%, the blending proportion of the stone chips of 0-5mm is determined to be 23.5%, the cement addition proportion is determined to be 1.5% and the mineral aggregate grading result of the mixture is shown in the following table through the screening test results of the recycled asphalt pavement material and the stone chips of 0-5 mm.

Technical indexes of recycled asphalt mixture (RAP) screening test results

Mineral aggregate grading composition of foamed asphalt cold-recycling mixture

Mixing RAP 0-5mm, stone chips and cement according to the weight ratio of 75: 23.5: and (3) mixing the raw materials according to the proportion of 1.5 to form the mineral aggregate, and performing a heavy compaction test on the synthetic mineral aggregate by changing the water content according to a method of T0131 in the conventional road soil engineering test regulation JTGE40-2010 to determine the optimal water content and the maximum dry density of the mixture. Finally, the optimal water content of the mixture is determined to be 5.8%.

Results of heavy compaction test of synthetic mineral aggregate

Taking four foam asphalt dosages of 1.5%, 2.0%, 2.5% and 3.0% to perform indoor test of the foam asphalt cold regeneration mixture, wherein the mixture blending proportion is 75% of RAP, 0-5mm stone chips and cement: 23.5: 1.5, four kinds of foamed asphalt cold recycling mixtures with different foamed asphalt dosages are respectively molded into Marshall test pieces (the two sides are compacted 75 times respectively). And determining the optimal asphalt dosage according to the mechanical property and the water stability of the foamed asphalt cold-recycling mixture. Based on the test results, a suitable foamed asphalt was determined to be 2.5%.

Splitting strength and dry density at different amounts of foamed asphalt

Amount of foamed asphalt (%)	1.5	2.0	2.5	3.0
					Splitting strength (MPa)	0.44	0.48	0.71	0.44
Dry and Wet cleavage Strength ratio TSR (%)	86.5	91.6	91.4	88.5
					Dry Density (g/cm)³)	1.190	2.212	2.245	2.221

3.2 production and construction process of foamed asphalt cold-recycling mixture

The production and construction are carried out according to the requirements of technical Specification for regenerating asphalt road surfaces of highways JTGF 41-2008.

4 foam asphalt warm recycled mixture mix proportion design and production construction process

4.1 mix proportion design of foamed asphalt warm regeneration mixture

Firstly, the mix proportion design of the hot asphalt recycling mixture is carried out. The mix proportion design of the hot asphalt recycled mixture is carried out according to a Marshall mix proportion design method, and the specific method is according to the requirements of technical Specifications for construction of road asphalt pavement (JTGF40-2008) and technical Specifications for regeneration of road asphalt pavement (JTGF 41-2008). And determining the mixing amount of RAP according to the property of the recycled asphalt pavement material by taking AC-20C as the target gradation of the hot asphalt recycled mixture. The RAP content in this example was 20%. And (3) screening the RAP into coarse and fine aggregates with the sizes of 0-9.5mm and more than 9.5mm according to requirements. And (3) obtaining the gradation of coarse RAP and fine RAP according to a screening test, and carrying out the gradation design of the hot asphalt recycled mixture AC-20C type mixture according to a mixing proportion gradation design principle. And mineral powder in the coarse RAP and the fine RAP is respectively used as one mineral aggregate in the regeneration mixture for mineral aggregate mixing proportion design.

Percent screen pass of hot asphalt reclaimed mix aggregate

According to the provisions in technical Specification for road asphalt pavement regeneration (JTGF41-2008), the optimal asphalt-stone ratio of the asphalt regeneration mixture is determined by measuring Marshall volume parameters of the asphalt regeneration mixture in the research. Preselecting 5 groups of different oilstone ratios such as 3.0%, 3.5%, 4.0%, 4.5%, 5.0% and the like to prepare a Marshall test piece, wherein when the test piece is molded by a Marshall electric compaction instrument, the compaction times of two surfaces of the test piece are respectively 75 times, the compaction temperature is between 140 ℃ and 150 ℃, the two surfaces of the test piece are respectively compacted for 75 times to mold the test piece, and a Marshall test is carried out to determine that the optimal oilstone ratio is 4.0%. The results of the Marshall test at the optimum oilstone ratio are shown in the following table.

Results of Marshall test at optimum oilstone ratio

Because the design of the foamed asphalt warm recycled mixture is carried out on the basis of the Marshall design method of the common hot asphalt recycled mixture, the mix proportion of the foamed asphalt warm recycled mixture to the dense-graded asphalt mixture AC-20C is as follows:

coarse RAP: fine RAP: 10-20 mm crushed stone: 5-10 mm gravel: 3-5 mm gravel: and (3) machining sand: 10 parts of mineral powder: 10: 30: 16: 8: 23: 3. the optimum oilstone ratio is 4.0%.

For the design of compaction temperature of the foamed asphalt warm recycled mixture, referring to the Marshall manufacturing temperature of the common hot asphalt recycled mixture, and taking 10 ℃ as a temperature step, two sides of the Marshall specimen are compacted respectively at 100 ℃, 110 ℃, 120 ℃, 130 ℃ and 140 ℃ for 75 times to form the Marshall specimen.

The volume parameters of the test pieces are measured by compacting the Marshall test pieces of the mixture at different temperatures under the same gradation and the optimal oilstone ratio of 4.0 percent as the common hot recycled asphalt.

Marshall volume parameter of foamed asphalt warm regeneration mixture formed at different temperatures

The porosity of the foamed asphalt warm recycled mixture at the compaction temperature of 120 ℃ is similar to that of the hot asphalt recycled mixture, and according to the principle of similar porosity, the optimal compaction molding temperature of the foamed asphalt warm recycled mixture is finally determined to be 120 ℃ and the mixing temperature is 130 ℃.

5-mix-ratio design production construction process of warm-mix rubber asphalt mixture

5.1 mix proportion design of warm-mix rubber asphalt mixture

And (3) designing the mixing ratio by adopting a Marshall test mixing ratio design method according to the principle that the volume parameter of the hot-mix asphalt mixture is as close as possible. Mix proportion design with AR-AC13 as target gradation

Firstly, determining mineral aggregate synthetic gradation of AR-AC13, and then primarily selecting 3 groups of oil-stone ratios according to the regulations of technical Specification for construction of road asphalt pavements (JTGF 40-2004) and according to experience, wherein the oil-stone ratios are respectively as follows: 5.5 percent, 6.0 percent and 6.5 percent, the rubber asphalt mixture is mixed indoors, the mixing temperature is 180 ℃, the Marshall test piece is molded by compacting 75 times by adopting two surfaces respectively, the compacting temperature is 170 ℃, the Marshall test is carried out after the maintenance, and the optimal oilstone ratio of the hot-mixed rubber asphalt mixture is determined according to various indexes.

The mixing proportion of the hot-mixed AR-AC13 is

The results of the Marshall test at the optimum oilstone ratio are shown in the following table:

results of Marshall test at optimum oilstone ratio of AR-AC13

The warm-mix rubber asphalt mixture adopts the same mineral aggregate gradation and the optimal asphalt dosage as the hot-mix rubber asphalt mixture. For the design of compaction temperature of the warm-mix asphalt mixture, referring to the manufacturing temperature of the Marshall of the common hot-mix asphalt mixture, the Marshall test piece is formed by compacting the double surfaces of the warm-mix asphalt mixture for 75 times respectively at 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 160 ℃ by taking 10 ℃ as a temperature step. The heating temperature of the warm-mixed rubber asphalt mixture is 155 +/-5 ℃. The volume parameters of the test pieces are shown in the following table.

The compacting temperature of the warm-mix rubber asphalt mixture is similar to the porosity of the warm-mix rubber asphalt mixture at 140 ℃ and 150 ℃, but the mineral aggregate porosity of the warm-mix rubber asphalt mixture at 150 ℃ does not meet the standard requirements, so the optimal compacting and forming temperature of the foamed warm-mix asphalt mixture is finally determined to be 140 ℃ and the mixing temperature is 150 ℃ according to the same or similar porosity of the common warm-mix asphalt mixture.

The road performance of the warm-mix rubber asphalt mixture is tested, and the test results are shown in the following table.

Test results of road performance under optimum oilstone ratio of warm-mixed AR-AC13

5.1 production and construction process of warm-mix rubber asphalt mixture

The production of the warm-mixed rubber asphalt mixture needs to install an asphalt foaming device on a hot recycling mixing device, and the temperature control of each link in the generation process is shown in the table.

Construction temperature (DEG C) of warm mix rubber asphalt mixture

Sequence of construction	Control temperature (. degree.C.)
		Heating temperature of mineral aggregate	170-195
Heating temperature of rubber asphalt	175-190
		Discharging temperature of warm-mixed rubber asphalt mixture	152-165
Temperature of mixture waste higher than	190
		Transported to the site at a temperature not lower than	145
The paving temperature of the mixture is not lower than	135
		The surface temperature after rolling is not lower than	95

The paving process of the warm-mixed rubber asphalt mixture is the same as that of the hot-mixed mixture.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The front, the back, the left, the right, the upper and the lower are all based on figure 3 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The road building process of the regenerative pavement structure is characterized by comprising a base layer and a surface layer, wherein the base layer comprises a cement-stabilized muck subbase layer, a cement-stabilized regenerative aggregate base layer and a foamed asphalt cold regenerative mixture flexible base layer which are arranged from bottom to top, and the surface layer comprises a warm-mixed regenerative asphalt mixture lower surface layer and a warm-mixed rubber asphalt mixture upper surface layer; the materials used for the cement-stabilized muck subbase layer comprise muck and cement, the materials used for the cement-stabilized recycled aggregate base layer comprise recycled aggregate and cement, the materials used for the foamed asphalt cold-recycled mixture flexible base layer comprise waste asphalt pavement recycled aggregate, new aggregate, foamed asphalt and cement, the materials used for the lower layer of the warm-mix recycled asphalt mixture comprise waste asphalt pavement recycled aggregate, new aggregate and new asphalt, and the materials used for the upper layer of the warm-mix rubber asphalt mixture comprise waste tire rubber powder, new asphalt, new aggregate and mineral powder;

the road building process comprises the following steps:

step one, road bed treatment;

the second step or the third step is also preceded by the steps of crushing recycled aggregate, sampling test, screening recycled aggregate and mixing; if the thickness of the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer is more than 20cm, the cement stabilized muck subbase layer, the cement stabilized recycled aggregate base layer and the foamed asphalt cold recycled mixture flexible base layer with the thickness of more than 20cm are divided into two layers for paving;

the paving equipment used in the seventh step comprises a machine body (1), wherein a crawler device (11) at the bottom of the machine body (1) is used for driving the machine body (1) to move; one side of the machine body (1) is provided with an ironing device (12) for flattening the asphalt mixture; one side of the machine body (1) far away from the ironing device (12) is hinged with a pair of hoppers (2) for feeding; a connecting rod (21) is obliquely arranged on the machine body (1) on one side of the hopper (2) far away from the ironing device (12), and the middle part of the connecting rod (21) is hinged with the machine body (1); one side of the connecting rod (21) far away from the machine body (1) is rotatably connected with a driving wheel (22), and the driving wheel (22) is used for driving a transport vehicle for transporting asphalt mixture to move synchronously with the paving equipment; a piston cylinder (23) is hinged to the machine body (1) on one side, away from the driving wheel (22), of the connecting rod (21), a piston (24) is connected in the piston cylinder (23) in a sliding mode, and a group of flow limiting holes (25) are formed in the piston (24); a piston rod (26) is fixedly connected to one side of the piston (24) far away from the bottom of the piston cylinder (23); a cylinder cover is arranged at one end, close to the piston rod (26), of the piston cylinder (23), and the piston rod (26) penetrates through the cylinder cover and is hinged with the connecting rod (21); damping liquid is filled in the piston cylinder (23); the piston (24) moves slowly in the piston cylinder (23) to avoid the rigid collision of the transport vehicle and the machine body (1);

the top of the hopper (2) is provided with an oil injection pipe (3), and a group of nozzles (31) are uniformly arranged on the oil injection pipe (3); the damping liquid is an anti-sticking agent; an oil inlet (27) is formed in one end, close to the bottom, of the piston cylinder (23), the oil inlet (27) is connected with an oil tank through a pipeline and a one-way valve, and an anti-sticking agent is filled in the oil tank; an oil outlet (28) is formed in one end, close to the cylinder cover, of the piston cylinder (23), and the oil outlet (28) is communicated with the oil injection pipe (3) through a one-way valve and a connecting pipe; the spout (31) sprays an anti-sticking agent for preventing the asphalt mixture from adhering to the inner wall of the hopper (2).

2. A process of constructing a regenerative pavement structure according to claim 1, comprising: the side wall and the bottom of the hopper (2) are made of a whole steel plate in a bending way, so that the splicing dead angle is eliminated, and the adhesion of the asphalt mixture on the inner wall of the hopper (2) is further reduced; a heating pipe (32) is arranged on the outer side of the position with the largest bending curvature of the side wall of the hopper (2), and two ends of the heating pipe (32) are respectively communicated with the oil injection pipe (3) and the oil outlet (28); the temperature in the oil tank is maintained at 200 ℃; the high-temperature anti-sticking agent flows through the heating pipe (32), so that the temperature of the part with the maximum bending curvature of the side wall of the hopper (2) is increased, and the adhesion of the asphalt mixture on the inner wall of the hopper (2) is further reduced.

3. A process of constructing a regenerative pavement structure according to claim 2, comprising: reinforcing ribs (33) with cross sections in a shape like a Chinese character 'ji' are arranged at the positions, corresponding to the heating pipes (32), on the outer side of the hopper (2), and the reinforcing ribs (33) are used for increasing the strength of the side wall of the hopper (2); the heating pipe (32) is sleeved inside the reinforcing rib (33), and the reinforcing rib (33) is utilized to reduce damage to the heating pipe (32).

4. A process of constructing a regenerative pavement structure according to claim 3, comprising: the gap between the reinforcing rib (33) and the heating pipe (32) is filled with heat-conducting silicone grease, the heating capability of the heating pipe (32) on the side wall of the hopper (2) is further improved, and the adhesion of the asphalt mixture on the inner wall of the hopper (2) is further reduced.

5. A process of constructing a regenerative pavement structure according to claim 4, comprising: an arc-shaped vibration cavity (34) is arranged on a pipeline between the heating pipe (32) and the oil injection pipe (3), a water wheel (35) is rotatably connected to the center of the vibration cavity (34), and an arc-shaped slot (37) is formed in a roller (36) in the middle of the water wheel (35); a guide plate (38) for guiding the anti-sticking agent is arranged at the bottom of the vibration cavity (34); the anti-sticking agent pushes the water wheel (35) to rotate to generate vibration, so that the adhesion of the asphalt mixture on the inner wall of the hopper (2) is further reduced.