Pavement maintenance construction method based on cold recycled old material recovery

Abstract

The invention relates to the technical field of road construction, and discloses a pavement maintenance construction method based on cold recycled old material recovery, which comprises the following steps: 1) carrying out traffic closing on a construction road section; (2) milling a base layer and a bottom surface layer of the construction pavement to form an old asphalt material; (3) adding cement, water and gravel aggregate into the old asphalt material, and stirring and mixing to form a regenerated mixture; 4) paving the regenerated mixture on the pavement by an asphalt paver to form a regenerated asphalt layer, and then spreading a high-viscosity modified emulsified asphalt seal layer; (5) paving a single-layer modified asphalt concrete overlay on the high-viscosity modified emulsified asphalt sealing layer; the recycled asphalt waste material is recycled to form a novel pavement structure form, so that waste material recycling is realized, and the problem of pollution caused by waste of a large number of pavement materials is solved; the porosity in the regenerated foamed asphalt pavement layer is reduced, and the waterproof performance of the pavement structure can be better improved.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to a road surface maintenance construction method based on recycling of cold recycled waste materials. Background Art

[0002] Highways are an important indicator of a country's economic strength and modernization level, and have a significant driving effect on the national economy and social development. With the rapid development of my country's highway industry, the maintenance task of highways has become increasingly heavy. my country's highways are mainly asphalt pavements, which are widely used in road projects, from rural roads to urban roads, from third-level highways to expressways. However, due to the differences in the asphalt concrete material itself, as well as the influence of the design, construction and maintenance level and the external environment, asphalt pavements often have cracks, looseness, subsidence, cracking, oil spills, rutting, potholes and other defects. The emergence of these defects seriously affects the driving speed and driving safety, shortens the service life of the asphalt pavement, and thus shortens the service life of the pavement. Therefore, it is necessary to repair the damaged asphalt pavement.

[0003] In the related art, when repairing the semi-rigid base and subbase roads that were damaged in the early stage, the traditional process is to plan the cracks and then repave with gravel and asphalt for repair. The inventors found that this process has obvious disadvantages. First, the scraped asphalt and other waste materials need to be disposed of harmlessly. Secondly, repaving requires a lot of construction costs, which is not in line with the circular economy model industrial chain advocated by the country.

[0004] CN101591881B Road surface repaired by cold regeneration technology and construction method thereof

[0005] CN107805991B Construction method of ultra-thin epoxy water-tight anti-skid layer on asphalt pavement

[0006] CN113622247A A low-carbon rapid maintenance and paving method for asphalt pavement rutting

[0007] CN221740790U A kind of asphalt pavement in-situ regeneration cover structure Summary of the invention

[0008] The purpose of the present invention is to provide a road surface repair construction method based on the recycling of cold recycled waste materials, aiming to solve the problem of increased waste discharge in the process of asphalt pavement repair in the prior art.

[0009] The present invention is implemented in this way: a road surface repair construction method based on cold recycled waste material recovery comprises the following steps:

[0010] 1) Construction preparation, traffic closure of the construction section;

[0011] 2) Use a cold regeneration machine to mill the base and bottom surface of the construction road surface, take out the milled material, crush and screen it to form asphalt waste material;

[0012] 3) Adding the old asphalt material to cement, water and crushed stone aggregate, and stirring and mixing to form a recycled mixture;

[0013] 4) The recycled mixture is continuously, evenly and uninterruptedly spread on the road surface behind it by an asphalt paver to form a recycled asphalt layer, and a high-viscosity modified emulsified asphalt seal layer is spread on the recycled asphalt layer;

[0014] 5) A single layer of modified asphalt concrete overlay is laid on the high-viscosity modified emulsified asphalt seal layer to complete the road maintenance construction.

[0015] Furthermore, in the construction step 2), the old asphalt material milled from the original road and the various dry materials in the premixed additives are screened to obtain screening results and grading ranges, and the blending ratio of the old asphalt material and the various dry materials in the premixed additives is calculated to be old asphalt material: crushed stone aggregate: cement = 89.5:8.0:2.5.

[0016] Furthermore, in the construction step 4), the high-viscosity modified emulsified asphalt seal layer is high-viscosity modified emulsified asphalt and crushed stones.

[0017] Furthermore, the spreading amount of the high-viscosity modified emulsified asphalt is 2.5-3.5 kg / m2, and the spreading amount of the crushed stone is 6-8 kg / m2.

[0018] Furthermore, the high-viscosity modified emulsified asphalt has a solid content of 60%, and the 60° C. dynamic viscosity of the evaporation residue is 250,000 Pa.s.

[0019] Furthermore, in the construction step 4), 20-40% of the total amount of epoxy asphalt required for the construction process is sprayed on the aggregate, and the remaining amount of the epoxy asphalt is directly sprayed on the single-layer modified asphalt concrete overlay.

[0020] Furthermore, the spraying amount of the epoxy asphalt is: 100-250g / ㎡.

[0021] Further, in the construction step 2), a rotating rolling recovery drum is provided on the bottom of the cold regeneration machine, and a plurality of buckets are provided on the outer periphery of the rolling recovery drum. The plurality of buckets are arranged around and spaced along the circumference of the rolling recovery drum, and the length of the buckets is arranged along the axial extension of the rolling recovery drum, and the buckets have a shovel cavity with an external opening; a recovery cavity with an external opening is provided in the cold regeneration machine, and a guide plate is extended from the bottom of the external opening of the recovery cavity toward the rolling recovery drum, and the guide plate is arranged in an inclined shape;

[0022] When the rolling recovery drum rotates to a set position, a portion of the shovel cavity of the bucket is communicated with the recovery cavity.

[0023] Furthermore, a plowing wheel is provided on the bottom of the cold regeneration machine, and the plowing wheel and the rolling recovery drum are arranged side by side with relative spacing, and the rolling recovery drum is located behind the plowing wheel. The cold regeneration machine is provided with a lifter for driving the rolling recovery drum to move up and down.

[0024] Furthermore, a plurality of rake teeth are provided at the bottom of the outer opening of the bucket, and the plurality of rake teeth are arranged in sequence and spaced apart along the length direction of the bucket, and a scraping surface is provided between adjacent rake teeth, and the scraping surface and the bucket are an integrated structure.

[0025] Compared with the prior art, the pavement maintenance construction method based on cold recycled old materials provided by the present invention recycles the recycled asphalt old materials to form a new type of pavement structure, thereby realizing the recycling of waste materials and solving the pollution problem caused by the disposal of a large amount of pavement materials, thereby saving resources and reducing economic investment; at the same time, a high-viscosity modified emulsified asphalt seal layer is paved between the recycled asphalt layer and the single-layer modified asphalt concrete overlay to ensure the interlayer bonding, so that the porosity inside the recycled foam asphalt pavement layer is reduced, which is beneficial to better enhance the compressive strength of the pavement structure while better improving the waterproof performance of the pavement structure, thereby extending the durability of the pavement structure, changing the pavement structure, avoiding diseases caused by semi-rigid base layers, and extending the service life of the road. Therefore, this construction method can produce good economic benefits, social benefits and environmental benefits, and has a high value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the construction process of the road surface repair construction method based on cold recycled waste material recovery provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of the cold regeneration machine provided by the present invention;

[0028] Figure 3 It is a schematic diagram of the side cutaway structure of the rolling recovery drum provided by the present invention;

[0029] Figure 4 It is a front view structural schematic diagram of the bucket provided by the present invention.

[0030] In the figure: a cold regenerator 10, a rolling recovery drum 20, a plowing wheel 30, a lifter 40, a recovery chamber 11, a guide plate 12, a bucket 21, a shovel chamber 22, rake teeth 23, and a scraping surface 24. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0033] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Reference Figure 1-4 The figure shows a preferred embodiment of the present invention.

[0035] The road surface repair construction method based on cold recycled waste material recycling includes the following steps:

[0036] 1) Construction preparation, traffic closure of the construction section;

[0037] 2) The cold regeneration machine 10 is used to mill the base layer and the bottom surface layer of the construction road surface, and the milled material is taken out, crushed and screened to form asphalt waste material;

[0038] 3) Add cement, water and crushed stone aggregate to the old asphalt material and mix them to form a recycled mixture;

[0039] 4) The recycled mixture is spread continuously, evenly and uninterruptedly on the road surface behind it by an asphalt paver to form a recycled asphalt layer, and a high-viscosity modified emulsified asphalt seal layer is spread on the recycled asphalt layer;

[0040] 5) Pave a single layer of modified asphalt concrete overlay on the high viscosity modified emulsified asphalt seal to complete the road maintenance construction.

[0041] The above-mentioned pavement maintenance construction method based on cold recycled old material recycling recycles asphalt recycled materials to form a new type of pavement structure, thereby realizing the recycling of waste materials and solving the pollution problem caused by the disposal of a large amount of pavement materials, thereby saving resources and reducing economic investment; at the same time, a high-viscosity modified emulsified asphalt seal layer is paved between the recycled asphalt layer and the single-layer modified asphalt concrete overlay to ensure the interlayer bonding, so that the porosity inside the recycled foam asphalt pavement layer is reduced, which is beneficial to better enhance the compressive strength of the pavement structure while better improving the waterproof performance of the pavement structure, thereby extending the durability of the pavement structure, changing the pavement structure, avoiding diseases caused by semi-rigid base, and extending the service life of the road. Therefore, this construction method can produce good economic benefits, social benefits and environmental benefits, and has a high value of promotion and application.

[0042] In construction step 2), the old asphalt material milled from the original road and the various dry materials in the premixed additives are screened to obtain the screening results and grading ranges, and the blending ratio of the old asphalt material and the various dry materials in the premixed additives is calculated to be old asphalt material: crushed stone aggregate: cement = 89.5:8.0:2.5.

[0043] In this embodiment, in construction step 4), the high-viscosity modified emulsified asphalt seal layer is high-viscosity modified emulsified asphalt and crushed stones.

[0044] The spreading amount of high-viscosity modified emulsified asphalt is 2.5-3.5 kg / ㎡, and the spreading amount of crushed stone is 6-8 kg / ㎡.

[0045] The high viscosity modified emulsified asphalt has a solid content of 60% and a dynamic viscosity of 250,000 Pa.s at 60°C of the evaporation residue.

[0046] The use of high-viscosity emulsified asphalt seal can not only prevent water from penetrating into the base layer and the underlying layer, but also enable the underlying layer to better bond with the water-stable base layer.

[0047] In this embodiment, in construction step 4), 20-40% of the total amount of epoxy asphalt required for the construction process is sprayed on the aggregate, and the remaining amount of epoxy asphalt is directly sprayed on the single-layer modified asphalt concrete overlay. In this way, the epoxy asphalt is sprayed more evenly and the adhesion of the aggregate is stronger, thereby further improving the overall strength and anti-skid performance of the road surface.

[0048] Epoxy asphalt has the advantages of fast construction speed, little interference with traffic during construction, little pollution to the environment, low driving noise, good waterproof and anti-skid durability, etc.

[0049] In this embodiment, the spraying amount of epoxy asphalt is: 100-250g / ㎡.

[0050] The road surface after construction has good waterproof function. The use of bonding materials with higher viscosity can prevent loose stones from falling off and aggregates from being lost; at the same time, it slows down the aging of asphalt on the road surface, improves the anti-skid performance of the road surface, and significantly improves the appearance of the road surface.

[0051] In this embodiment, in construction step 2), a rotating rolling recovery drum 20 is provided at the bottom of the cold regeneration machine 10, and a plurality of buckets 21 are provided on the outer periphery of the rolling recovery drum 20. The plurality of buckets 21 are arranged around and spaced along the circumference of the rolling recovery drum 20, and the length of the buckets 21 is arranged along the axial extension of the rolling recovery drum 20, and the buckets 21 have a shovel cavity 22 with an external opening; a recovery cavity 11 with an external opening is provided in the cold regeneration machine 10, and a guide plate 12 is extended from the bottom of the external opening of the recovery cavity 11 toward the rolling recovery drum 20, and the guide plate 12 is arranged in an inclined shape;

[0052] When the rolling recovery drum 20 rotates to a set position, the shovel cavity 22 of a portion of the shovel bucket 21 is communicated with the recovery cavity 11 .

[0053] The cold regeneration machine 10 can continuously recycle and clean the asphalt old material particles and dust remaining in the bottom layer after milling through the multiple buckets 21 on the rolling recovery drum 20, thereby improving the recycling rate of the asphalt old material. The cold regeneration machine 10 uses the guide plate 12 to receive the asphalt old material particles and dust introduced by the bucket 21, and the asphalt old material particles and dust can be introduced into the recovery chamber 11 through the inclined bucket 21.

[0054] In this embodiment, a plowing wheel 30 is provided on the bottom of the cold regeneration machine 10, and the plowing wheel 30 and the rolling recovery drum 20 are arranged side by side and relatively spaced apart. The rolling recovery drum 20 is located behind the plowing wheel 30, and a lifter 40 is provided in the cold regeneration machine 10 for driving the rolling recovery drum 20 to move up and down.

[0055] The cold regeneration machine 10 can mill the construction road surface base and bottom layer through the planing wheel 30, and the lifting device 40 can drive the rolling recovery drum 20 to move up and down. When the bottom layer is exposed, the lifting device 40 can drive the rolling recovery drum 20 to descend to the set position so that the rolling recovery drum 20 can recycle the asphalt waste material particles.

[0056] In this embodiment, a plurality of rake teeth 23 are provided at the bottom of the outer opening of the bucket 21. The plurality of rake teeth 23 are arranged in sequence and spaced apart along the length direction of the bucket 21. A scraping surface 24 is provided between adjacent rake teeth 23. The scraping surface 24 and the bucket 21 are an integrated structure.

[0057] The bottom of the bottom layer can be plowed by multiple rake teeth 23 on the bucket 21 to form grooves, so that the subsequent recycled mixture can be spread in the grooves to form structural beams. The structural beams are embedded in the bottom layer to increase the stability of the recycled asphalt layer structure.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A road maintenance construction method based on cold recycled waste material recycling, characterized in that: The following steps are involved: 1) Construction preparation, traffic closure of the construction section; 2) Use a cold regeneration machine to mill the base and bottom surface of the construction road surface, take out the milled material, crush and screen it to form asphalt waste material; 3) Adding the old asphalt material to cement, water and crushed stone aggregate, and stirring and mixing to form a recycled mixture; 4) The recycled mixture is continuously, evenly and uninterruptedly spread on the road surface behind it by an asphalt paver to form a recycled asphalt layer, and a high-viscosity modified emulsified asphalt seal layer is spread on the recycled asphalt layer; 5) A single layer of modified asphalt concrete overlay is laid on the high-viscosity modified emulsified asphalt seal layer to complete the road maintenance construction.

2. The road surface repair construction method based on cold recycled waste material recovery as claimed in claim 1, characterized in that: In the construction step 2), the old asphalt material milled from the original road and the various dry materials in the premixed additives are screened to obtain screening results and grading ranges, and the blending ratio of the old asphalt material and the various dry materials in the premixed additives is calculated to be old asphalt material: crushed stone aggregate: cement = 89.5:8.0:2.

5.

3. The road surface repair construction method based on cold recycled waste material recycling as claimed in claim 2, characterized in that: In the construction step 4), the high-viscosity modified emulsified asphalt seal layer is high-viscosity modified emulsified asphalt and crushed stones.

4. The road surface repair construction method based on cold recycled waste material recycling as claimed in claim 3, characterized in that: The spreading amount of the high-viscosity modified emulsified asphalt is 2.5-3.5 kg / m2, and the spreading amount of the crushed stone is 6-8 kg / m2.

5. The road surface repair construction method based on cold recycled waste material recovery as claimed in claim 4, characterized in that: The high-viscosity modified emulsified asphalt has a solid content of 60%, and a dynamic viscosity of 250,000 Pa.s at 60° C. of the evaporation residue.

6. The road surface repair construction method based on cold recycled waste material recycling as claimed in claim 5, characterized in that: In the construction step 4), 20-40% of the total amount of epoxy asphalt required for the construction process is sprayed on the aggregate, and the remaining amount of the epoxy asphalt is directly sprayed on the single-layer modified asphalt concrete overlay.

7. The road surface repair construction method based on cold recycled waste material recovery as claimed in claim 6, characterized in that: The spraying amount of the epoxy asphalt is: 100-250g / ㎡.

8. The road surface repair construction method based on cold recycled waste material recycling according to any one of claims 1 to 7, characterized in that: In the construction step 2), a rotating rolling recovery drum is arranged on the bottom of the cold regeneration machine, and a plurality of buckets are arranged on the outer circumference of the rolling recovery drum. The plurality of buckets are arranged around and spaced along the circumference of the rolling recovery drum, and the length of the buckets is arranged along the axial extension of the rolling recovery drum, and the buckets have a shovel cavity with an external opening; a recovery cavity with an external opening is arranged in the cold regeneration machine, and a guide plate is extended from the bottom of the external opening of the recovery cavity toward the rolling recovery drum, and the guide plate is arranged in an inclined shape; When the rolling recovery drum rotates to a set position, a portion of the shovel cavity of the bucket is communicated with the recovery cavity.

9. The road surface repair construction method based on cold recycled waste material recycling as claimed in claim 8, characterized in that: A plowing wheel is arranged on the bottom of the cold regeneration machine. The plowing wheel and the rolling recovery drum are arranged side by side with relative spacing. The rolling recovery drum is located behind the plowing wheel. A lifter for driving the rolling recovery drum to move up and down is arranged in the cold regeneration machine.

10. The road surface repair construction method based on cold recycled waste material recycling as claimed in claim 9, characterized in that: A plurality of rake teeth are arranged at the bottom of the outer opening of the bucket, and the plurality of rake teeth are arranged in sequence and spaced apart along the length direction of the bucket. A scraping surface is arranged between adjacent rake teeth, and the scraping surface and the bucket are an integrated structure.

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