CN112832087A - Full-flexible plant-mixed hot recycling asphalt pavement structure - Google Patents
Full-flexible plant-mixed hot recycling asphalt pavement structure Download PDFInfo
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- CN112832087A CN112832087A CN202110038153.5A CN202110038153A CN112832087A CN 112832087 A CN112832087 A CN 112832087A CN 202110038153 A CN202110038153 A CN 202110038153A CN 112832087 A CN112832087 A CN 112832087A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a fully flexible plant-mixed hot recycling asphalt pavement structure, and belongs to the field of road engineering. The method is characterized by comprising a composite regeneration graded broken stone cushion layer, a high milling material mixing amount plant-mixed hot recycled asphalt mixture flexible base layer, a high milling material mixing amount plant-mixed hot recycled lower surface layer, a conventional milling material mixing amount middle surface layer and a conventional milling material mixing amount surface layer, wherein the composite regeneration graded broken stone cushion layer, the high milling material mixing amount plant-mixed hot recycled asphalt mixture flexible base layer, the high milling material mixing amount plant-mixed hot recycled lower surface layer, the conventional milling material mixing amount middle surface layer and the conventional milling material mixing amount surface layer are sequentially paved on a rolled roadbed from bottom to top. Compared with the prior art, the hot recycling asphalt pavement structure has the characteristics of low cost, long service life, short construction period and the like, and has good popularization and application values.
Description
Technical Field
The invention relates to the field of road engineering, and particularly provides a fully flexible plant-mixed hot recycling asphalt pavement structure.
Background
From a material perspective:
the existing plant-mixing hot recycling technology for the asphalt pavement can recycle the old pavement materials, has the obvious advantages of resource saving, environmental protection and investment reduction, and has great economic and social benefits.
From the implementation effect, the conventional plant-mixed hot recycling (the milling material mixing proportion is within 30%) is widely applied to road engineering, but the plant-mixed hot recycling mixture with high mixing amount (the milling material mixing proportion is more than 30%) is rarely applied to a higher structural layer of a high-grade road due to the influence of the performance, especially the fatigue resistance, of the plant-mixed hot recycling mixture, so that the application is not wide.
From the point of view of the road surface structure:
most of the conventional pavement structures in China are semi-rigid pavement structure forms, a semi-rigid base layer with a certain thickness is arranged below an asphalt surface layer, usually a cement stabilized macadam base layer, the pavement structure plays a great role in the highway construction period in China, and simultaneously, a plurality of problems are shown, such as the cracking problem of the semi-rigid base layer, the short service life of the pavement structure layer, the difficulty in maintaining the pavement structure and the like.
Resource recycling angle:
at present, the mileage of a highway in China rapidly increases after years of large-scale construction, the mileage of the highway in China exceeds 14.3 kilometers by 2019, the highway occupies the second place in the world, pavement maintenance is increased day by day after large-scale construction, and a large amount of asphalt milling materials and water stabilizing milling materials can be generated in road maintenance, reconstruction and extension. The conventional asphalt milling material is used as a hot regeneration technology and a cold regeneration technology, the cold regeneration technology can only be used in a lower flexible base layer due to the technical limitation, the performance of a mixture cannot meet the requirement of a surface layer, and although the hot regeneration technology can be applied to the asphalt surface layer, the mixing proportion of the milling material is limited, the asphalt milling material cannot be rapidly and efficiently consumed, and the environmental benefit is poor.
The economical efficiency and the construction period are as follows:
along with the environmental importance of China in recent years, the price of sand and stone materials is greatly increased, the pavement structure form mainly comprising the traditional semi-rigid base layer is less and less dominant in the aspect of engineering cost, and particularly, the price of asphalt is lower in recent years, and the cost of a water-stable layer is closer and closer to the cost of an asphalt layer. In addition, the traditional semi-rigid base layer needs a longer maintenance period, so that the influence on the road section with higher guarantee requirement is larger.
Generally speaking, with the economic development of China and the improvement of the requirements on the highway service level, the pavement structure mainly comprising the semi-rigid base layer gradually does not meet the requirements, and a structural form which can prolong the service life of the road and greatly consume waste pavement materials is needed to meet the increasing requirements of vehicles and people on going out.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a fully flexible plant-mixed hot recycling asphalt pavement structure with low cost, short construction period and long service life.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fully flexible plant-mixed hot recycled asphalt pavement structure is characterized by comprising a composite regeneration graded broken stone cushion layer, a plant-mixed hot recycled asphalt mixture flexible base layer with high milling material mixing amount, a plant-mixed hot recycled lower surface layer with medium and high milling material mixing amount, a conventional milling material mixing amount middle surface layer and a conventional milling material mixing amount surface layer, wherein the composite regeneration graded broken stone cushion layer, the plant-mixed hot recycled asphalt mixture flexible base layer with high milling material mixing amount, the plant-mixed hot recycled lower surface layer with medium and high milling material mixing amount, the conventional milling material mixing amount middle surface layer and the conventional milling material mixing amount surface layer are sequentially paved on a well rolled roadbed from bottom to top.
In the pavement structure, the composite regenerative graded broken stone cushion layer is arranged at the lowest part of the structural layer and is used for transmitting the load of the upper part to the roadbed structural layer, and due to the waterproof characteristic of the composite regenerative graded broken stone cushion layer, the capillary water at the bottom can be reduced to permeate to the upper structure, and the structural layer can meet the freezing depth requirement of a road through flexible thickness adjustment; the flexible base layer of the plant-mixed hot recycled asphalt mixture with high milling material mixing amount is used as a main bearing layer of the pavement structure, and has high fatigue resistance and deformation resistance; the method is characterized in that a plant-mixed hot recycling lower surface layer with medium and high milling material mixing amount is arranged on a plant-mixed hot recycling asphalt mixture flexible base layer with high milling material mixing amount, the mixing amount of milling materials is reduced relative to the plant-mixed hot recycling asphalt mixture flexible base layer, and the fatigue resistance requirement is higher and the mixture requirement is stricter along with the increasing of the surface layer; the surface layer in the mixing amount of the conventional milling and planing material mainly bears the maximum shear stress in a pavement structure, the requirement on the anti-rutting performance is high, and the low-temperature resistance of the surface layer is also met due to the high layer position; the surface layer of the conventional milled material mainly bears the direct load of a vehicle, and needs to have certain surface functions, such as skid resistance and waterproof performance, and needs an asphalt mixture with higher performance.
Preferably, according to the frost resistance design of the road, the composite regenerative graded broken stone cushion layer is paved by a single layer or double layers, the thickness of the single layer is 15-20 cm, and after the composite regenerative graded broken stone cushion layer is paved, the roadbed resilience modulus of the road surface is not less than 150 MPa.
Further, the composite regenerative graded crushed stone cushion is formed by compounding the processed (original milling materials are screened and graded according to the requirements of sieve pores) asphalt milling materials and water-stable milling materials, wherein the asphalt milling materials are adopted for the parts below the sieve pores of 4.75mm, and the water-stable milling materials are adopted for the parts above the sieve pores of 4.75 mm. Particularly, when the mass ratio of the asphalt milling material to the water stable milling material is 1 (1-3), the load transmission effect is optimal.
Further, the grading range of the composite regenerative graded broken stone cushion layer is preferably as follows:
the passing rate range of a standard sieve pore of 31.5mm is 100 percent; the passing rate range of the standard sieve pore of 26.5mm is 80-100%; the 19mm passing rate range of the standard sieve pore is 60-85%; the passing rate range of a standard sieve pore of 9.5mm is 50-75%; the passing rate range of a standard sieve pore of 4.75mm is 25-50%; the passing rate of a standard sieve pore of 0.6mm is 5-30%; the passing rate range of the standard sieve holes with 0.075mm is 3-6%.
Preferably, the plant-mixed hot recycling asphalt mixture flexible base layer with high milling material mixing amount consists of a lower flexible base layer and an upper flexible base layer, the thicknesses of the lower flexible base layer and the upper flexible base layer are both 8-12cm, the adopted cementing material is modified asphalt, and the mixing ratio of the asphalt milling material is not less than 50%.
Before the lower flexible base layer is paved, a hot asphalt synchronous broken stone sealing layer is preferably paved on the composite regeneration graded broken stone cushion layer to bond the upper layer structure and the lower layer structure, and meanwhile, underground water is prevented from permeating into the surface layer, so that the waterproof effect is achieved.
After the lower flexible base layer and the upper flexible base layer are paved, modified emulsified asphalt adhesive layers are preferably spread on the lower flexible base layer and the upper flexible base layer to achieve the bonding effect between the upper asphalt surface layer and the lower asphalt surface layer.
Further, the grading range of the flexible base layer of the plant-mixed hot recycled asphalt mixture with the high milling material mixing amount is preferably as follows:
the passing rate range of a standard sieve pore of 31.5mm is 100 percent; the passing rate range of the standard sieve mesh with 26.5mm is 85-100%; the 19mm passing rate range of the standard sieve pore is 60-80%; the passing rate range of the standard sieve pore 13.2mm is 40-70%; the passing rate range of a standard sieve pore of 9.5mm is 30-60%; the passing rate range of 4.75mm standard sieve holes is 35-55%; the passing rate range of a standard sieve pore of 2.36mm is 20-50%; the passing rate range of standard sieve pores with the diameter of 1.18mm is 10-30%; the passing rate range of the standard sieve pore of 0.6mm is 7-25%; the passing rate range of the standard sieve pore of 0.3mm is 5-21%; the passing rate range of the standard sieve pore of 0.15mm is 5-18%; the passing rate range of the standard sieve holes with 0.075mm is 3-8%.
Preferably, the hot-mix plant recycling lower surface layer with the medium-high milling material mixing amount is made of an AC-25 asphalt mixture, the thickness is 8-10cm, matrix asphalt or modified asphalt is adopted, the asphalt milling material mixing ratio is 30% -50%, and after paving is completed, a modified emulsified asphalt adhesive layer is spread.
Preferably, the conventional milling material mixing amount of the middle surface layer adopts an AC-20C asphalt mixture, the thickness of the middle surface layer is 6-8cm, modified asphalt or high-viscosity modified asphalt is adopted, the mixing proportion of the asphalt milling material is not more than 30%, and after the paving is finished, the modified emulsified asphalt adhesive layer is spread.
Preferably, the surface layer of the conventional milling material mixing amount adopts SMA-13 asphalt mixture, the thickness of the surface layer is 3-4cm, SBS modified asphalt or high-viscosity modified asphalt is adopted, and the mixing ratio of the asphalt milling material is not more than 30%.
Preferably, the total thickness of the flexible base layer of the plant-mixed hot recycled asphalt mixture with high milling material mixing amount, the lower layer of the plant-mixed hot recycled asphalt mixture with high milling material mixing amount, the middle layer of the conventional milling material mixing amount and the surface layer of the conventional milling material mixing amount is not less than 35 cm.
Preferably, the high milling material mixing amount plant-mixed hot recycling asphalt mixture flexible base layer and the low medium and high milling material mixing amount plant-mixed hot recycling layer can be added with a certain proportion of a recycling agent, and the type selection and the mixing proportion of the recycling agent are determined according to the performance of aged asphalt in the asphalt milling material.
The composite regeneration graded broken stone cushion layer, the conventional milling material mixing amount middle surface layer and the conventional milling material mixing amount surface layer can be added with a regenerant according to the performance test result of the mixture if the low-temperature performance does not meet the standard requirement; if the low temperature properties meet the specification requirements, no regenerant needs to be added.
The regenerant is preferably RA5 or RA25 hot-mix asphalt regenerant.
Compared with the prior art, the fully flexible hot mix plant recycling asphalt pavement structure has the following outstanding beneficial effects:
the first step is that the asphalt pavement structure with the fully flexible design has obvious fatigue resistance advantage compared with the traditional semi-rigid base layer, and structural damage caused by poor adhesion of the semi-rigid base layer and an asphalt surface layer can not occur. From the perspective of road surface use real name, the structural design service life of the semi-rigid base road surface is 15 years, but medium repair is generally carried out for 5-7 years, heavy repair is carried out for 10 years, the condition that the service time exceeds the design service life rarely exists, the service life of the fully-flexible road surface is more than twice of that of the semi-rigid base road surface, only slight rutting treatment and surface anti-skid recovery are carried out in the whole service period, heavy repair or structural maintenance is not carried out, road building resources are saved in the whole service period, and the service quality of the road is improved.
The waste asphalt pavement milling and planing materials and the water stabilizing milling and planing materials are fully utilized, so that the real regeneration of the asphalt pavement materials is realized, the waste pavement materials generated in road maintenance and reconstruction and expansion can be consumed to the maximum extent, the pollution of the materials to the environment is reduced, and the land occupied by the materials in a stacking way is reduced; on the other hand, the large-scale use of the milling and planing materials reduces the mining of mine resources to a certain extent and reduces the use of materials such as asphalt and the like, and is greatly helpful for the sustainable development of resources.
And (III) the thickness of the pavement is reduced by more than 40cm, the early-stage manufacturing cost of the fully flexible plant-mixed hot recycling pavement structure is reduced by at least 20 percent compared with that of the conventional semi-rigid asphalt pavement structure, the budget expenditure at the initial stage of a project can be obviously reduced, money is reduced for owners and nations to build, and the construction resources are saved.
And (IV) the pavement structure does not contain semi-rigid materials, so that closed maintenance is not needed in the construction process, the construction period of a project can be shortened by more than one month, and the engineering benefit and the traffic protection benefit are obvious.
Drawings
FIG. 1 is a schematic structural diagram of a fully flexible hot mix plant recycled asphalt pavement according to an embodiment.
The reference numerals in the drawings denote:
1. the method comprises the following steps of rolling a roadbed, 2, a composite regenerative graded broken stone cushion layer, 3, a high milling material mixing amount plant-mixed hot-recycling asphalt mixture flexible base layer, 31, a lower flexible base layer, 32, an upper flexible base layer, 4, a medium and high milling material mixing amount plant-mixed hot-recycling lower surface layer, 5, a conventional milling material mixing amount middle surface layer and 6, a conventional milling material mixing amount surface layer.
Detailed Description
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting.
[ examples ] A method for producing a compound
The fully flexible plant-mixed hot recycling asphalt pavement structure of the embodiment mainly comprises a composite regeneration graded broken stone cushion layer 2, a high milling material mixing amount plant-mixed hot recycling asphalt mixture flexible base layer 3, a medium and high milling material mixing amount plant-mixed hot recycling lower surface layer 4, a conventional milling material mixing amount middle surface layer 5 and a conventional milling material mixing amount surface layer 6 which are sequentially paved on a rolled roadbed 1 from bottom to top.
1. Paving of composite regenerative graded broken stone cushion layer 2
According to the frost resistance design of roads in construction areas, the requirement of freezing depth can be met by adopting a single layer, therefore, the single-layer composite regenerative graded broken stone cushion layer 2 with the thickness of 20cm is adopted at the bottom, the actual measurement result of the roadbed resilience modulus of the road surface is 190MPa, and the requirement of not less than 150MPa is met.
The composite regeneration graded broken stone cushion layer 2 is formed by compounding screened asphalt milling materials and water-stable milling materials, wherein the part below a sieve pore of 4.75mm adopts the asphalt milling materials, and the part above the sieve pore of 4.75mm adopts the water-stable milling materials. The gradation of the composite regenerative graded broken stone cushion layer is as follows:
wherein the mass ratio of the asphalt milling material to the water stable milling material is 32: 68.
The CBR value required by the graded crushed stone is 100 percent, and the CBR value of the graded crushed stone is 285 percent through detection, which far exceeds the requirement result of the specification.
2. Paving of plant-mixed hot recycled asphalt mixture flexible base layer 3 with high milling material mixing amount
The high milling material mixing amount plant-mixed hot recycled asphalt mixture flexible base layer 3 is paved in a layered mode and comprises a lower flexible base layer 31 and an upper flexible base layer 32, and the paving thickness of each layer is 9 cm.
The lower flexible base layer 31 is paved on the composite milling graded broken stone cushion layer 2. Before the lower flexible base layer 31 is laid, a hot asphalt synchronous gravel seal layer needs to be laid on the composite regenerative graded gravel cushion layer 2. The synchronous gravel sealing layer adopts SBS modified asphalt, the spreading amount is 1.2kg per square meter, and the spreading amount of gravel is 7kg per square meter.
The upper flexible base layer 32 is laid on the lower flexible base layer 31.
After the lower flexible base layer 31 and the upper flexible base layer 32 are paved, adhesive layers are uniformly spread, the adhesive layers are made of modified emulsified asphalt, the solid content is 52%, and the spreading amount is 0.6kg per square meter.
The mixing proportion of the asphalt milling and planing material in the plant-mixed hot recycled mixture of the lower flexible base layer 31 and the upper flexible base layer 32 is 55%, and the adopted cementing material is SBS modified asphalt. The dosage of SBS modified asphalt is 2.4% of the total mass of the mixture. In order to enable the performance of the mixture to meet the requirements, RA25 hot-mix asphalt regenerant accounting for 0.2 percent of the total mass of the mixture is added, and the gradation meets the following requirements:
through performance tests, the performance of the mixture meets the following table:
| detecting items | Unit of | Actual measurement result | Specification requirements |
| Marshall stability | kn | 11.4 | 8 |
| Flow value | mm | 3.5 | 2～4 |
| Degree of dynamic stability | Sub/mm | 5187 | 2800 |
| Low temperature performance | μm | 2894 | 2800 |
| Freezing and thawing cleavage test | ％ | 83 | 80 |
All indexes of the mixture meet the standard requirements, the dynamic stability of the mixture reflecting the high-temperature performance is nearly doubled, and the permanent deformation resistance is obvious.
3. Paving of lower layer 4 of plantmix thermal regeneration with medium-high milling planer material mixing amount
The plant-mixed hot recycling lower surface layer 4 with the mixing amount of the medium-high milling planer material adopts plant-mixed hot recycling AC-25 asphalt mixture, the thickness is 8cm, the mixing proportion of the milling planer material is 45%, and the cementing material adopts matrix asphalt. The dosage of the matrix asphalt is 2 percent of the total mass of the mixture, and the added RA25 hot-mix asphalt regenerant accounts for 0.15 percent of the total mass of the mixture.
The AC-25 grading in this example is as follows:
the performance of the mixture meets the following requirements:
| detecting items | Unit of | Actual measurement result | Specification requirements |
| Marshall stability | kn | 13.4 | 8 |
| Flow value | mm | 3.3 | 2～4 |
| Degree of dynamic stability | Sub/mm | 4632 | 1000 |
| Freezing and thawing cleavage test | ％ | 88 | 75 |
The performance of the mixture meets the standard requirement, and the dynamic stability is higher.
After the layer is paved, a modified emulsified asphalt bonding layer is spread. The solid content of the modified emulsified asphalt is 52 percent, and the spreading amount is 0.6kg per square meter.
4. Paving of surface layer 5 in conventional milling material mixing amount
The middle surface layer 5 of the conventional milling and planing material mixing amount adopts an AC-20C asphalt mixture, the thickness of the middle surface layer 5 is 6cm, the milling and planing material mixing proportion is 28%, and the cementing material adopts modified asphalt. The consumption of the modified asphalt is 3.3 percent of the total mass of the mixture, the performance of the mixture is higher, and no additional regenerant is needed.
The gradation of the mixture is as follows:
the properties of the mixture meet the following requirements:
| detecting items | Unit of | Actual measurement result | Specification requirements |
| Marshall stability | kn | 13.7 | 8 |
| Flow value | mm | 3.1 | 2～4 |
| Degree of dynamic stability | Sub/mm | ＞6000 | 2800 |
| Low temperature performance | μm | 2933 | 2800 |
| Freezing and thawing cleavage test | ％ | 89.3 | 80 |
The mixture has excellent performance and all the performances exceed the standard requirements.
After the construction of the structural layer is finished, a modified emulsified asphalt adhesive layer is spread.
5. Surface layer 6 for conventional milling material mixing amount
The surface layer 6 of the conventional milling material mixing amount adopts an SMA-13 asphalt mixture, the thickness of the surface layer is 4cm, the mixing ratio of the milling material of the SMA pavement is 21 percent, and SBS modified asphalt is adopted. The additional SBS modified asphalt accounts for 5 percent of the total mass of the mixture. The added fiber accounts for 0.2 percent of the mass of the mixture.
The mixing proportion of the mixture is as follows:
the properties of the mixture meet the following requirements:
| detecting items | Unit of | Actual measurement result | Specification requirements |
| Marshall stability | kn | 12.8 | 6 |
| Degree of dynamic stability | Sub/mm | ＞6000 | 2800 |
| Low temperature performance | μm | 3211 | 2800 |
| Freezing and thawing cleavage test | ％ | 92.1 | 80 |
The performance of the mixture meets the standard requirement.
6. Analysis of economics
According to the comparison between the conventional highway pavement structure and the structure of the invention, the economic efficiency of the pavement structure is analyzed from the aspect of construction cost, and the analysis results are shown in the following table
By adopting the pavement structure, the construction cost can be reduced by 155.7 yuan per square meter, the saving range is 34.6%, the economic benefit is remarkable, the bidirectional four-lane highway is calculated according to the width of 3.75m multiplied by 4 (lane) +3m (emergency lane) × 2 (left and right two pieces) ═ 21m on the pavement, the construction cost can be saved by 327 ten thousand yuan per kilometer (1000m), the construction cost of a road surface layer can be reduced by 3.27 million yuan per hundred kilometers, and the economic effect is remarkable.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (9)
1. Full flexible hot recycling bituminous pavement structure of plantmix, its characterized in that: the high milling material mixing amount plant-mixed heat regeneration asphalt mixture composite regeneration graded broken stone cushion layer, the high milling material mixing amount plant-mixed heat regeneration lower surface layer, the conventional milling material mixing amount middle surface layer and the conventional milling material mixing amount surface layer are sequentially paved on a rolled roadbed from bottom to top.
2. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: according to the frost resistance design of the road, the composite regenerative graded broken stone cushion layer is paved by a single layer or double layers, the thickness of the single layer is 15-20 cm, the composite regenerative graded broken stone cushion layer is paved on a rolled roadbed, and after paving is finished, the roadbed resilience modulus of the road surface is not less than 150 MPa.
3. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 2, characterized in that: the composite regeneration graded broken stone cushion layer is formed by compounding an asphalt milling material and a water-stable milling material, wherein the part below a sieve pore of 4.75mm adopts the asphalt milling material, the part above the sieve pore of 4.75mm adopts the water-stable milling material,
the grading range of the composite regeneration graded broken stone cushion layer is as follows:
the passing rate range of a standard sieve pore of 31.5mm is 100 percent; the passing rate range of the standard sieve pore of 26.5mm is 80-100%; the 19mm passing rate range of the standard sieve pore is 60-85%; the passing rate range of a standard sieve pore of 9.5mm is 50-75%; the passing rate range of a standard sieve pore of 4.75mm is 25-50%; the passing rate of a standard sieve pore of 0.6mm is 5-30%; the passing rate range of the standard sieve holes with 0.075mm is 3-6%.
4. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: the high milling material mixing amount plant-mixed hot recycled asphalt mixture flexible base layer consists of a lower flexible base layer and an upper flexible base layer, the thicknesses of the lower flexible base layer and the upper flexible base layer are both 8-12cm, the adopted cementing material is modified asphalt, the mixing ratio of the asphalt milling material is not less than 50 percent,
before the lower flexible base layer is paved, a hot asphalt synchronous broken stone sealing layer is paved on the composite regenerative graded broken stone cushion layer;
after the lower flexible base layer and the upper flexible base layer are paved, modified emulsified asphalt adhesive layers are respectively spread on the lower flexible base layer and the upper flexible base layer.
5. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 4, characterized in that: the grading range of the plant-mixed hot recycled asphalt mixture flexible base layer with high milling material mixing amount is as follows:
the passing rate range of a standard sieve pore of 31.5mm is 100 percent; the passing rate range of the standard sieve mesh with 26.5mm is 85-100%; the 19mm passing rate range of the standard sieve pore is 60-80%; the passing rate range of the standard sieve pore 13.2mm is 40-70%; the passing rate range of a standard sieve pore of 9.5mm is 30-60%; the passing rate range of 4.75mm standard sieve holes is 35-55%; the passing rate range of a standard sieve pore of 2.36mm is 20-50%; the passing rate range of standard sieve pores with the diameter of 1.18mm is 10-30%; the passing rate range of the standard sieve pore of 0.6mm is 7-25%; the passing rate range of the standard sieve pore of 0.3mm is 5-21%; the passing rate range of the standard sieve pore of 0.15mm is 5-18%; the passing rate range of the standard sieve holes with 0.075mm is 3-8%.
6. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: the lower surface layer of the plant-mixed hot recycling with the medium-high milling material mixing amount adopts an AC-25 asphalt mixture with the thickness of 8-10cm, adopts matrix asphalt or modified asphalt, the mixing ratio of the asphalt milling material is 30-50%, and after the paving is finished, a modified emulsified asphalt adhesive layer is spread.
7. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: the conventional milling material mixing amount of the middle surface layer adopts an AC-20C asphalt mixture, the thickness of the middle surface layer is 6-8cm, modified asphalt or high-viscosity modified asphalt is adopted, the mixing proportion of the asphalt milling material is not more than 30%, and after the paving is finished, the modified emulsified asphalt adhesive layer is spread.
8. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: the surface layer of the conventional milling material mixing amount adopts SMA-13 asphalt mixture, the thickness of the surface layer is 3-4cm, SBS modified asphalt or high-viscosity modified asphalt is adopted, and the mixing ratio of the asphalt milling material is not more than 30%.
9. The fully flexible hot mix plant recycling asphalt pavement structure according to claim 1, characterized in that: the total thickness of the high milling material mixing amount plant-mixed hot recycling asphalt mixture flexible base layer, the high milling material mixing amount plant-mixed hot recycling lower surface layer, the conventional milling material mixing amount middle surface layer and the conventional milling material mixing amount surface layer is not less than 35 cm.
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