Asphalt pavement structure for high-valued full-cyclic recycling of asphalt pavement milling materials

Abstract

The utility model discloses an asphalt pavement structure for high-valued full-cyclic recycling of an asphalt pavement milling material, which relates to the field of asphalt pavements and comprises a modified asphalt mastic regenerated macadam SMA-13 surface layer and a large-dosage plant-mixed hot regenerated asphalt stabilized macadam ATB-25 lower surface layer, the utility model discloses an RAP cement-doped stabilized macadam softening anti-crack base layer, a full-depth cold-recycled subbase layer and a C25 cast-in-place recycled concrete road shoulder. According to the utility model, the asphalt pavement milling material fine oilstone separation and recycling technology is taken as a main line, the asphalt pavement milling material RAP is recycled, the milling material of a full pavement structure is recycled, and old asphalt and old aggregate in the RAP are effectively separated in a physical mode by utilizing the asphalt pavement milling material aggregate recycling equipment, so that the recycling of the asphalt pavement milling material is realized. The method realizes accurate grading management of the RAP recycled aggregate, solves the problem of resource recycling by doping the old asphalt pavement milling material into the cement stabilized macadam base, and also can improve the cracking resistance of the cement stabilized macadam material.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of asphalt pavement, especially asphalt pavement structure of high-value full cycle recycling of asphalt pavement milling material. BACKGROUND

[0002] After entering the 21st century, the construction of highways in China has made great progress. According to statistics, about 10% of the asphalt pavement needs to be repaired every year in China, and more than 6 million tons of reclaimed asphalt pavement (RAP) are generated every year, and this number is increasing every year. If the waste asphalt mixture can be utilized, more than 900 million yuan of material cost can be saved every year. At the same time, high energy consumption and serious pollution are the current status of the road industry, and how to promote its development towards energy saving and environmental protection is also the direction of the current road development. High-value full cycle recycling of old asphalt pavement milling material can save a large amount of sand and stone raw materials, save engineering investment, and is beneficial to waste disposal and environmental protection, so it has significant economic, social and environmental benefits.

[0003] The current domestic old asphalt pavement milling material recycling technology has the problems of low utilization rate and low performance of recycled mixture, which restricts the promotion and development of asphalt pavement recycling technology. Due to the variability of RAP material performance, the old asphalt cannot be fully mixed with new asphalt and recycling agent, and the discharge temperature of recycled asphalt mixture is low, so the RAP material mixing ratio of hot mix plant recycling technology is generally less than 30%, and the recycled asphalt mixture formed has the problems of low temperature performance, water stability and insufficient fatigue resistance. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide an asphalt pavement structure of high-value full cycle recycling of asphalt pavement milling material in view of the above-mentioned deficiencies of the prior art.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] The asphalt pavement structure of high-value full-cycle recycling of asphalt pavement milling material comprises a full-depth cold recycling bottom base layer, a RAP-mixed cement stabilized gravel flexible anti-cracking base layer, a large-mix-amount plant-mixed hot recycling asphalt concrete ATB-25 lower layer, a modified asphalt mastic recycling gravel SMA-13 surface layer and a C25 cast-in-place recycled concrete shoulder, the full-depth cold recycling bottom base layer, the RAP-mixed cement stabilized gravel flexible anti-cracking base layer, the large-mix-amount plant-mixed hot recycling asphalt concrete ATB-25 lower layer and the modified asphalt mastic recycling gravel SMA-13 surface layer are sequentially laid from bottom to top, and the C25 cast-in-place recycled concrete shoulder is laid above part of the full-depth cold recycling bottom base layer on one side of the RAP-mixed cement stabilized gravel flexible anti-cracking base layer, the large-mix-amount plant-mixed hot recycling asphalt concrete ATB-25 lower layer and the modified asphalt mastic recycling gravel SMA-13 surface layer.

[0007] The asphalt pavement structure of high-value full-cycle recycling of asphalt pavement milling material comprises a full-depth cold recycling bottom base layer, a RAP-mixed cement stabilized gravel flexible anti-cracking base layer, a large-mix-amount plant-mixed hot recycling asphalt concrete ATB-25 lower layer, a modified asphalt mastic recycling gravel SMA-13 surface layer and a C25 cast-in-place recycled concrete shoulder, through the ingenious structure design, the utilization rate of the old asphalt pavement milling material of the asphalt pavement structure is fully improved, and the milling material utilization of the full pavement structure is realized.

[0008] As a further optimization of the utility model, the RAP-mixed cement stabilized gravel flexible anti-cracking base layer is composed of cement, new aggregate and asphalt pavement milling material RAP, and the mixing proportion of the asphalt pavement milling material is 30-45%. While reducing the mining of new stone, the anti-cracking performance of the semi-rigid base layer is improved, and the inherent quality defects, such as the temperature shrinkage and dry shrinkage cracks of the semi-rigid base layer, are reduced.

[0009] As a further optimization of the utility model, the RAP mixing proportion in the large-mix-amount plant-mixed hot recycling asphalt concrete ATB-25 lower layer is greater than 50%. With the help of the milling material recycling equipment, the old asphalt and old aggregate in the RAP are effectively separated, the false particle size phenomenon and variability of the RAP are eliminated, the quality fluctuation problem of the recycling asphalt mixture and the fusion regeneration recovery problem of the new and old asphalt are effectively solved when the old material mixing amount of the plant-mixed hot recycling technology is too high, and the large-proportion and high-performance recycling of the milling material is realized.

[0010] As a further preferred embodiment of the present application, the proportion of the recycled aggregate in the modified asphalt mastic recycled macadam SMA-13 surface layer is 30-40%.

[0011] As a further preferred embodiment of the present application, the milled material fine separation recycled aggregate is used in the C25 cast-in-place recycled concrete shoulder.

[0012] The full-depth cold recycling base layer is cold recycled by an on-site cold recycling machine, and the old road materials are fully utilized. The full-depth cold recycling base layer fully utilizes the "residual value" of the old pavement materials, improves the utilization value of the old pavement materials, and does not produce waste old pavement materials, thereby reducing the environmental pollution.

[0013] As a further preferred embodiment of the present application, the pavement structure realizes the full-pavement-structure milled material recycling utilization. The thickness of the full-depth cold recycling base layer is 18-20 cm, the thickness of the RAP-doped cement stabilized macadam softening anti-cracking base layer is 18-20 cm, the thickness of the large-doped plant-mixed hot recycled asphalt concrete ATB-25 lower layer is 8 cm, the thickness of the modified asphalt mastic recycled macadam SMA-13 surface layer is 4 cm, and the top width of the C25 cast-in-place recycled concrete shoulder is 25 cm, and the bottom width is 36-37 cm.

[0014] The present application has the following beneficial effects:

[0015] The present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The present application has the following beneficial effects:

[0017] Wherein: 1, full-depth cold regeneration bottom base layer; 2, RAP-doped cement stabilized macadam flexible anti-cracking base layer; 3, large-mix-amount plant-mixed hot recycled asphalt concrete ATB-25 lower layer; 4, modified asphalt mastic recycled macadam SMA-13 surface layer; 5, C25 cast-in-place recycled concrete shoulder. DETAILED DESCRIPTION

[0018] The utility model will be described in further detail below in combination with the drawings and specific preferred embodiments.

[0019] In the description of the utility model, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, so they cannot be understood as limiting the utility model. The specific dimensions used in the embodiment are only used to illustrate the technical scheme and do not limit the protection scope of the utility model.

[0020] As shown in the drawing, Figure 1 The asphalt pavement structure of high-value full-cycle recycling of asphalt pavement milling material comprises a full-depth cold regeneration bottom base layer 1, a RAP-doped cement stabilized macadam flexible anti-cracking base layer 2, a large-mix-amount plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3, a modified asphalt mastic recycled macadam SMA-13 surface layer 4 and a C25 cast-in-place recycled concrete shoulder 5. The full-depth cold regeneration bottom base layer 1, the RAP-doped cement stabilized macadam flexible anti-cracking base layer 2, the large-mix-amount plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 and the modified asphalt mastic recycled macadam SMA-13 surface layer 4 are sequentially laid from bottom to top, and the C25 cast-in-place recycled concrete shoulder 5 is laid above part of the full-depth cold regeneration bottom base layer 1 on one side of the RAP-doped cement stabilized macadam flexible anti-cracking base layer 2, the large-mix-amount plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 and the modified asphalt mastic recycled macadam SMA-13 surface layer 4.

[0021] The utility model discloses a full-depth cold regeneration bottom base layer 1, mixes RAP cement stabilized macadam flexible anti -crack base layer 2, big -dose plant -mixing hot regeneration asphalt concrete ATB -25 lower layer 3, modified asphalt mastic regeneration macadam SMA -13 surface layer 4 and C25 cast -in -situ regeneration concrete road shoulder 5, through ingenious structure design, full -use rate of asphalt pavement structure to old asphalt pavement milling material is improved fully, realizes full -pavement structure milling material utilization.

[0022] Full-depth cold regeneration bottom base layer 1 adopts full-depth cold regeneration technology and can recycle old road pavement structure material by 100%, does not produce waste old pavement material, and has little environmental pollution.

[0023] Mixes RAP cement stabilized macadam flexible anti -crack base layer 2 adopts RAP to modify cement stabilized macadam base material, can improve the flexibility and anti -deformation ability of cement stabilized macadam base, slows down or prevents the cracking of cement stabilized macadam base, effectively reduces the early damage of asphalt pavement, improves the performance of asphalt pavement and prolongs the service life.

[0024] The special "milling material separation equipment" is used to crush, strip, screen the asphalt pavement milling material, physically strips, impacts, grinds and separates the asphalt and aggregate, eliminates the old material false particle size problem, and can produce 0-3mm, 3-5mm, 5-10mm, 10-16mm, 16-25mm aggregate. The fine separation recycled aggregate is widely applicable and can be used for micro-surfacing, macadam seal coat, base layer, asphalt concrete surface layer, crack treatment, various small components prefabrication and the like; can eliminate the "black stone" phenomenon of recycled asphalt mixture and improve the road performance of recycled asphalt mixture; can eliminate the "false particle size" in aggregate, effectively solve the plant-mixing hot-mixing quality fluctuation problem, and realize large proportion and high performance recycling.

[0025] The mixing RAP cement stabilized macadam flexible anti -crack base layer 2 is composed of cement, new aggregate and asphalt pavement milling material RAP, and the mixing proportion of asphalt pavement milling material is 30-45%. While reducing the new stone mining, the anti-cracking performance of semi-rigid base layer is improved, and the inherent quality defects such as temperature shrinkage and dry shrinkage cracks of semi-rigid base layer are reduced.

[0026] The RAP content ratio in the large-content plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 is greater than 50%. With the help of the milling material recycling equipment, the old asphalt and old aggregate in the RAP are effectively separated, the false particle size phenomenon and variability of the RAP are eliminated, the quality fluctuation problem of the recycled asphalt mixture and the old asphalt fusion regeneration recovery problem of the recycled asphalt mixture when the old material content is too high are effectively solved, and the large proportion and high performance recycling of the milling material is realized.

[0027] In the large-content plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 and the modified asphalt mastic recycled gravel SMA-13 surface layer 4, the recycled aggregate obtained by "oil-stone fine separation" of the asphalt pavement milling material is mixed, and the recycled aggregate content ratio is greater than 50% and 30-40%, respectively.

[0028] The crushed stone in the C25 cast-in-place recycled concrete shoulder 5 is all recycled aggregate obtained by fine separation of the milling material. The full-depth cold recycled base layer 1 is cold recycled by an on-site cold recycling machine, and the old road material is fully utilized. The full-depth cold recycled base layer 1 fully utilizes the "residual value" of the old pavement material, improves the utilization value of the old pavement material, and does not produce waste old pavement material, which has little environmental pollution.

[0029] The pavement structure realizes full pavement structure milling material recycling, the thickness of the full-depth cold recycled base layer 1 is 18-20 cm, the thickness of the RAP cement stabilized gravel softening anti-cracking base layer 2 is 18-20 cm, the thickness of the large-content plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 is 8 cm, the thickness of the modified asphalt mastic recycled gravel SMA-13 surface layer 4 is 4 cm, and the top width of the C25 cast-in-place recycled concrete shoulder 5 is 25 cm, and the bottom width is 36-37 cm.

[0030] In the above structure, the full-depth cold recycled base layer 1 can realize 100% recycling of the original pavement surface layer and base layer material. The RAP can be used to soften and modify the cement stabilized gravel base layer material, which can improve the flexibility and anti-deformation ability of the cement stabilized gravel base layer, slow down or prevent the cracking of the cement stabilized gravel base layer, consume a large amount of RAP, greatly reduce the exploitation of new resources, effectively improve the problem of lack of new energy, and liberate the site where the RAP is stacked, which is of great help to the sustainable development of society. The modified asphalt mastic recycled gravel SMA-13 surface layer 4 and the large-content plant-mixed hot recycled asphalt concrete ATB-25 lower layer 3 use recycled aggregate obtained by "oil-stone fine separation" of the asphalt pavement milling material to replace part of the aggregate. The asphalt pavement milling material is subjected to "oil-stone fine separation", which realizes high-content utilization of the milling material, and the oil-stone separation technology can realize the recycling of the aggregate in the milling material, a large proportion of asphalt waste can be absorbed, a large amount of aggregate can be saved, and the production cost can be greatly reduced.

[0031] The utility model discloses a fine oil stone separation recycling technology of asphalt pavement milling material as the main line, through the recycling of asphalt pavement milling material RAP, realize all pavement structure milling material recycling, with old material to replace new material, reduce stone mining, release milling material accumulation occupation, reduce production cost, can effectively reduce carbon dioxide emission about 20~35%. Through utilizing asphalt pavement milling material aggregate recycling equipment, take physical mode to old asphalt and old aggregate in RAP effective separation, realize RAP recycled aggregate accurate grading management, recycled aggregate in asphalt surface layer and concrete road shoulder application, realize milling material 100% utilization, through cement stabilized macadam base layer mixed into old asphalt pavement milling material, solve the problem of resource recycling, can also improve the anti-cracking performance of cement stabilized macadam material, through the full deep cold in-place recycling base layer to the original pavement, can recycle old road pavement structure material, do not produce waste old road material, reduce the pollution to the environment, adopt recycled aggregate all replace cement concrete road shoulder macadam, can realize milling material high value application.

[0032] The above detailed the preferred embodiments of the utility model, but, the utility model is not limited to the specific details in the above-mentioned embodiments, in the technical concept range of the utility model, can carry out multiple equivalent conversion to the technical scheme of the utility model, and these equivalent conversions all belong to the protection scope of the utility model.

Claims

1. Asphalt pavement structure with high-value and fully recycled asphalt pavement milling materials, characterized by: It includes a full-depth cold recycled subbase (1), a RAP cement-stabilized crushed stone softened anti-cracking base (2), a high-volume factory-mixed hot recycled asphalt concrete ATB-25 lower layer (3), a modified mastic asphalt recycled crushed stone SMA-13 ​​surface layer (4), and a C25 cast-in-place recycled concrete shoulder (5); The full-depth cold recycled subbase (1), the RAP cement-stabilized crushed stone softened anti-cracking base (2), the high-volume plant-mixed hot recycled asphalt concrete ATB-25 lower layer (3) and the modified mastic asphalt recycled crushed stone SMA-13 ​​surface layer (4) are laid in sequence from bottom to top, and the C25 cast-in-place recycled concrete shoulder (5) is laid on a portion of the full-depth cold recycled subbase (1) on one side of the RAP cement-stabilized crushed stone softened anti-cracking base (2), the high-volume plant-mixed hot recycled asphalt concrete ATB-25 lower layer (3) and the modified mastic asphalt recycled crushed stone SMA-13 ​​surface layer (4).

2. The asphalt pavement structure with high-value, fully recycled asphalt pavement milling materials according to claim 1 is characterized by: The crushed stones in the C25 cast-in-situ recycled concrete shoulder (5) are all recycled aggregates finely separated from milled materials.

3. The asphalt pavement structure with high-value, fully recycled asphalt pavement milling materials according to claim 1 is characterized by: The thickness of the full-depth cold recycled subbase (1) is 18 to 20 cm, the thickness of the RAP cement-stabilized crushed stone softened anti-cracking base (2) is 18 to 20 cm, the thickness of the high-volume factory-mixed hot recycled asphalt concrete ATB-25 lower layer (3) is 8 cm, the thickness of the modified mastic asphalt recycled crushed stone SMA-13 ​​surface layer (4) is 4 cm, and the top width of the C25 cast-in-place recycled concrete shoulder (5) is 25 cm, and the bottom width is 36 to 37 cm.

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