Intelligent detection, judgment and directional regeneration method of waste aged asphalt mixture

Abstract

The invention relates to the technical field of asphalt pavement maintenance, solves the technical problem of pavement performance reduction caused by incapability of secondary utilization of a waste asphalt mixture or poor regeneration effect in existing pavement maintenance operation, and particularly relates to an intelligent detection, judgment and directional regeneration method of a waste aged asphalt mixture. Comprising the following steps: extracting by using a solvent with good fat solubility, determining the mass fraction of asphaltene in the waste asphalt mixture, and calculating the aging degree of the mixture in combination with the proposal of an aging index formula; and then, determining the addition amount of the regenerant according to the mass of the mixture, calculating the mass of a new asphalt mixture needing to be added according to the area and thickness of the pavement to be repaired, and mixing and uniformly stirring the materials to obtain the regenerated asphalt mixture. According to the method, the aging degree of the mixture is scientifically measured and sorted, the regenerant is accurately added, and the method is used for promoting circulation and recycling of the waste asphalt mixture in pavement repairing operation.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement maintenance technology, and in particular to an intelligent detection, judgment and directional recycling method for waste and aged asphalt mixtures. Background Technology

[0002] With the continuous improvement of my country's highway network, the demand for asphalt pavement maintenance has exploded. In pavement repair operations, the recycling of waste asphalt mixtures faces challenges such as the lack of quantitative testing of the mixture's aging index, the use of crude recycling agents with incomplete impurity removal, and the lack of intelligent decision-making in material proportioning, all of which affect maintenance quality and resource utilization. For example, the utility model patent CN216891897U, which discloses an "Automatic Milling and Loading Microwave Heating Maintenance Vehicle for Road Potholes," while achieving continuous automated operations for pothole milling, waste material recycling, microwave heating regeneration, and backfilling, thus improving maintenance efficiency, still suffers from the following key technological shortcomings: Excessively aged asphalt mixtures directly involved in recycling will severely reduce the core road performance of freshly mixed asphalt, such as low-temperature crack resistance and durability, leading to damage to repaired pavements in a short period of time.

[0003] The lack of a scientific decision-making mechanism based on on-site working conditions makes it impossible to judge the economic and technical feasibility of recycling materials. Blindly recycling will lead to recycling costs exceeding the cost of new materials, while directly abandoning recycling will result in resource waste.

[0004] Therefore, there is an urgent need for an intelligent detection and recycling method for milling materials that is based on quantitative detection data and has both intelligent decision-making and precise adaptation functions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an intelligent detection, judgment, and directional recycling method for waste aged asphalt mixtures, solving the technical problems of existing road maintenance operations where waste asphalt mixtures cannot be reused or where poor recycling results lead to a decline in road performance.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for intelligent detection, judgment and directional recycling of waste aged asphalt mixture, the specific steps of which are as follows: S1. Cut the potholes in the asphalt pavement into regular potholes, and pre-treat and collect the waste asphalt mixture generated during the cutting process. S2. Calculate the volume of the regular potholes and the waste asphalt mixture, and determine whether to recycle the collected waste asphalt mixture based on the ratio between the two. If the ratio is greater than or equal to the threshold The collected waste asphalt mixture is then recycled and proceeds to the next step. If the ratio is less than the threshold If so, then no regeneration process is needed and the process ends; S3. Determine the mass fraction of asphalt in waste asphalt mixtures using solvent extraction method. And based on the mass fraction Calculate the aging index of asphalt in waste asphalt mixtures. ; S4, Based on Aging Index Determine the amount of recycling agent to be added, and calculate the required mass of new asphalt mixture based on the regular potholes and the volume of waste asphalt mixture; S5. Mix the new asphalt mixture with the waste asphalt mixture and the recycling agent, heat it to the required construction temperature using a microwave heating device, and finally pour it into the regular potholes and compact it to complete the road repair.

[0007] Further, step S1 includes: Based on the size and shape of the potholes in the asphalt pavement, they are cut into regular potholes including circles, rectangles, and polygons; The waste asphalt mixture generated from cutting is crushed and then vibrated and screened using a double-layer grading screen. The upper screen has an aperture of 8-10 mm and the lower screen has an aperture of 2-3 mm. Magnetic plates with a magnetic attraction strength of ≥12000Gs are used to adsorb and remove metallic impurities from waste asphalt mixtures, and then negative pressure dust removal is applied to them.

[0008] Further, step S2 includes: Measure the dimensions of the regular pit and calculate its volume; Weigh the pretreated waste asphalt mixture by mass M and measured volume V, and calculate the actual bulk density of the waste asphalt mixture. The calculation formula is: Based on actual bulk density Calculate the volume of the waste asphalt mixture and the ratio between the two based on the volume of the regular pothole.

[0009] Furthermore, step S2 also includes: Threshold estimation based on cost-benefit balance in regeneration mode The calculation formula is: In the formula, Reduced material costs per unit volume of virgin material; The overall cost of regenerating milling material per unit volume; in, The calculation formula is: In the formula, The comprehensive cost of recycling a unit volume of asphalt mixture; Additional costs such as equipment depreciation and labor exist during on-site construction; Electricity cost per unit volume of microwave heating for asphalt mixture (yuan / ) ); Unit mass procurement cost of regenerant (RMB / ) kg ); R This refers to the amount of recycler added per unit volume of heavily aged asphalt mixture; The actual bulk density of waste asphalt mixture ( ).

[0010] Further, step S3 includes: Weigh The weight of asphalt in the waste asphalt mixture is calculated based on its asphalt-aggregate ratio. The calculation formula is: In the formula, The ratio of oil to stone; The waste asphalt mixture was loaded into a container with a mass of... The filter membrane was placed in a container containing n-heptane and toluene extractant. After stirring for 30 seconds, the container was placed in a centrifuge with a speed of 3000 rpm and centrifuged for 5 minutes. Remove the filter membrane and its residue, and dry them with nitrogen gas at 40°C until the filter membrane and residue are completely dry. Weigh and record the total mass. ; Calculate the mass fraction of asphalt in sequence. and the aging index of asphalt in waste asphalt mixtures ; The mass fraction of asphalt is: In the formula, The initial mass (g) of the filter membrane; The total mass of asphalt precipitate and filter membrane (g). The aging index of asphalt is: In the formula, This serves as the benchmark value for the asphaltene content of new asphalt; This is the benchmark value for the asphaltene content of severely aged asphalt.

[0011] Further, step S4 includes: When aging index ≤ At that time, the waste asphalt mixture was slightly aged and could be recycled without the addition of recycling agents; When aging index > At that time, the waste asphalt mixture was severely aged and required the addition of [material / material] by weight. The regenerant is recycled and reused, that is: In the formula, K This is an empirical coefficient; is the baseline aging index threshold; M is the mass (g) of the waste asphalt mixture.

[0012] Furthermore, the method for calculating the volume of the new asphalt mixture includes two scenarios: when recycling is not required and when recycling is required. In cases where recycling is not required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is less than the threshold Abandoning the recycling of waste asphalt mixtures, the volume of new asphalt mixtures Equal to the volume of the regular pit ; In situations where recycling is required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is greater than or equal to the threshold The method for calculating the volume of new asphalt mixtures during waste asphalt mixture recycling is divided into two categories based on whether or not a recycling agent is added: When no regenerant is needed: when the aging index ≤ The waste asphalt mixture is slightly aged and does not require the addition of recycling agents. The volume of the new asphalt mixture is... Equal to the volume of the regular pit Subtract the volume of waste asphalt mixture ; When regeneration is required: when the aging index > The waste asphalt mixture is severely aged and requires the addition of a recycling agent. The volume of the new asphalt mixture... Equal to the volume of the regular pit Subtract the volume of usable waste asphalt mixture after recycling .

[0013] By employing the above technical solution, the present invention provides an intelligent detection, judgment, and directional recycling method for waste aged asphalt mixtures, which has at least the following beneficial effects: 1. This invention determines the asphaltene content using a solvent extraction-mass analysis method, indirectly quantifying the aging index of milling materials. Based on the aging index... By adjusting the amount of recycling agent added, the problems of insufficient or excessive recycling caused by adding it at a fixed ratio can be solved. This allows for precise addition of the recycling agent, improving the recycling rate of waste asphalt mixtures and maximizing the recycling of waste asphalt mixtures.

[0014] 2. This invention provides a method for determining recycling demand based on a waste asphalt mixture volume threshold: When the volume of the waste asphalt mixture is below a set threshold, its recycling can only slightly reduce the amount of fresh asphalt mixture required, resulting in limited cost savings and significantly extending the construction period. Therefore, its overall cost-effectiveness is low, and recycling is unnecessary; it can be directly discarded. When the volume of the waste asphalt mixture is above the set threshold, it can reduce procurement costs, and the waste asphalt mixture has value for direct recycling. This method balances construction efficiency and cost, avoiding resource waste and reducing maintenance costs.

[0015] 3. This invention effectively removes pollutants through multi-stage purification, including graded screening, magnetic metal removal, and negative pressure dust removal, ensuring that the milled material entering the recycling stage is of uniform and pure quality, thereby improving the durability of the final repaired road surface.

[0016] 4. By constructing an integrated process, this invention improves the problems of disconnect between testing and construction and independent operation of each process in the prior art, greatly shortens the time spent on connecting on-site maintenance processes, and improves overall work efficiency.

[0017] 5. This invention utilizes an integrated process to achieve "purification-detection-decision-sorting-fitting" of waste asphalt mixtures, solving the problems of extensive mixture sorting, poor fit, and blind decision-making, thereby improving maintenance quality and economy. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart of the intelligent detection, judgment, and directional regeneration method in this invention. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This will allow for a full understanding and implementation of how the present application uses technical means to solve technical problems and achieve technical effects.

[0020] Example 1: This embodiment proposes an intelligent detection, judgment, and targeted recycling method for waste aged asphalt mixtures. By utilizing an integrated process to achieve "purification—detection—decision-sorting—fitting" of waste asphalt mixtures, it solves the problems of extensive mixture sorting, poor fit, and blind decision-making, thereby improving maintenance quality and economy. Figure 1 As shown, the method includes the following steps: Asphalt pavement pothole treatment: Based on the size and shape of the asphalt pavement potholes, they are cut into regular shapes such as circles, rectangles, and polygons, and the waste asphalt mixture generated from the cutting is crushed and collected.

[0021] Waste asphalt mixture pretreatment and purification: The collected waste asphalt mixture undergoes multi-stage purification treatment, specifically including: Grading and screening: High-frequency low-amplitude vibration screening is carried out using a double-layer grading screen. The upper screen has a mesh size of 8-10mm to remove gravel and plastic waste with a diameter > 8-10mm; the lower screen has a mesh size of 2-3mm to separate dust and soil with a particle size < 2-3mm. An inclined waste collection trough and a classified waste bin are set below the screen.

[0022] Magnetic metal removal: A strong magnetic plate with a magnetic attraction strength of ≥12000Gs is set on the conveying path of the material after screening to adsorb metal impurities in the material and collect the adsorbed metal impurities into a special waste box.

[0023] Negative pressure dust removal: A negative pressure air intake is set above the screen and connected to the dust removal system on the maintenance vehicle to remove dust raised during the screening process in real time.

[0024] Measurement of the volume of potholes and waste asphalt mixture: Calculate the volume of the regular potholes formed after cutting; weigh the collected waste asphalt mixture (M) and the measured volume (V), and then use the formula... The actual bulk density of this batch of waste asphalt mixture was calculated. Then, the volume of the waste asphalt mixture is calculated.

[0025] Recycling Demand Assessment: Based on the volume of regular potholes and waste asphalt mixture, determine the ratio between the two, and then determine whether the collected waste asphalt mixture should be recycled. If the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is greater than or equal to the threshold The collected waste asphalt mixture is relatively large and has significant recycling value, so it needs to be further recycled. If the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is less than the threshold If the waste asphalt mixture is recycled, it will not only fail to reduce costs but will also increase the construction period, so there is no need for recycling.

[0026] In this invention, a threshold is estimated based on the cost-benefit balance relationship under the regeneration mode. The calculation formula is: In the formula, Reduced material costs per unit volume of virgin material; The overall cost of regenerating milling material per unit volume; in, The calculation formula is: In the formula, The comprehensive cost of recycling a unit volume of asphalt mixture; Additional costs such as equipment depreciation and labor exist during on-site construction; Electricity cost per unit volume of microwave heating for asphalt mixture (yuan / ) ); Unit mass procurement cost of regenerant (RMB / ) kg ); R This refers to the amount of recycler added per unit volume of heavily aged asphalt mixture; The actual bulk density of waste asphalt mixture ( ).

[0027] The aging index testing of waste asphalt mixtures specifically includes: Weigh The waste asphalt mixture of grams, combined with its asphalt-aggregate ratio S, is used using the formula Calculate the weight of asphalt in the waste asphalt mixture. ; The waste asphalt mixture was loaded into a container with a mass of... The filter membrane was placed in a container containing n-heptane and toluene extractant. After stirring for 30 seconds, the container was placed in a centrifuge with a speed of 3000 rpm and centrifuged for 5 minutes. Remove the filter membrane and its residue, and dry them with nitrogen gas at 40°C until the filter membrane and residue are completely dry. Weigh and record the total mass. ; The mass fraction of asphalt is: In the formula, The initial mass (g) of the filter membrane; The total mass of asphalt precipitate and filter membrane (g). The aging index of asphalt is: In the formula, This serves as the benchmark value for the asphaltene content of new asphalt; This is the benchmark value for the asphaltene content of severely aged asphalt.

[0028] Determination of regenerator dosage: When aging index ≤ At that time, the waste asphalt mixture was slightly aged and could be recycled without the addition of recycling agents; When aging index > At that time, the waste asphalt mixture was severely aged and required the addition of [material / material] by weight. The regenerant is recycled and reused, that is: In the formula, K This is an empirical coefficient; is the baseline aging index threshold; M is the mass (g) of the waste asphalt mixture. Recycling of waste asphalt mixture: Based on the volume of the regular pothole and the waste asphalt mixture, calculate the required mass of new asphalt mixture, mix it with the waste asphalt mixture and recycling agent, heat it to the required construction temperature using a microwave heating device, and finally pour it into the pothole and compact it to complete the road repair.

[0029] In this invention, the method for calculating the volume of the new asphalt mixture includes two scenarios: when recycling is not required and when recycling is required. In cases where recycling is not required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is less than the threshold Abandoning the recycling of waste asphalt mixtures, the volume of new asphalt mixtures Equal to the volume of the regular pit ; In situations where recycling is required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is greater than or equal to the threshold The method for calculating the volume of new asphalt mixtures during waste asphalt mixture recycling is divided into two categories based on whether or not a recycling agent is added: When no regenerant is needed: when the aging index ≤ The waste asphalt mixture is slightly aged and does not require the addition of recycling agents. The volume of the new asphalt mixture is... Equal to the volume of the regular pit Subtract the volume of waste asphalt mixture ; When regeneration is required: when the aging index > The waste asphalt mixture is severely aged and requires the addition of a recycling agent. The volume of the new asphalt mixture... Equal to the volume of the regular pit Subtract the volume of usable waste asphalt mixture after recycling .

[0030] Example 2: This embodiment, based on Embodiment 1, and in conjunction with specific parameters and operating procedures in a certain region, provides a detailed description of the implementation process of the present invention, enabling those skilled in the art to reproduce the present invention based on this embodiment, as follows: I. Implementation Prerequisites and Test Parameter Setting (I) Project Background This embodiment selects the G4211 Ningwu Two-way Four-lane Expressway K120+350~K120+380 as the implementation target. Irregular potholes appeared on the asphalt pavement of this section. The pothole area has a maximum length of 3.2m, a maximum width of 2.1m, and an average depth of 0.09m. The pavement structure is 4cm fine-grained asphalt concrete (AC-13C) + 6cm medium-grained asphalt concrete (AC-20C). The maintenance operation is carried out using the method of this invention.

[0031] (II) Basic Parameter Settings Unit volume procurement cost of new asphalt mixture (AC-13C) =1850 yuan / m 3 Actual bulk density =2350kg / m 3 ; Microwave heating electricity cost =85 yuan / m 3 Unit mass procurement cost of regenerant (model RH-70) =28 yuan / kg, the unit volume recycling agent addition amount for heavily aged asphalt mixture is R=45kg / m³. 3 Additional on-site construction costs (including equipment depreciation and labor) =55 yuan / m 3 ; Benchmark values ​​for asphaltene content in new asphalt =8.2%, the benchmark value for asphaltene content in severely aged asphalt. =24.8%; Benchmark aging index threshold =0.6, empirical coefficient K=0.0032.

[0032] II. Specific Implementation Steps S1. Treatment of potholes in asphalt pavement.

[0033] A road surface cutter was used to cut the pothole into regular rectangles (3.0m long × 2.0m wide × 0.09m deep) according to the actual boundaries, ensuring that the cut surfaces were vertical and the edges were flat. A small milling machine was used to mill and crush the damaged asphalt mixture within the cutting area, controlling the particle size to within 50mm. The crushed waste asphalt mixture was then collected into a temporary storage bin via a scraper conveyor, preventing spillage and loss of the mixture throughout the process. A total of 680kg of initial waste asphalt mixture was collected.

[0034] S2. Pretreatment and purification of waste asphalt mixture.

[0035] Grading and screening: A double-layer high-frequency low-amplitude vibrating screen (vibration frequency 50Hz, amplitude 3mm) is used for screening. The upper screen mesh size is set to 10mm to remove impurities such as gravel and plastic debris with a diameter >10mm (total 12kg); the lower screen mesh size is set to 2mm to separate dust and soil with a particle size <2mm (total 18kg). The mass of the mixture after screening is 680-12-18=650kg.

[0036] Magnetic removal of metal: A strong magnetic plate with a magnetic attraction strength of 12000Gs is installed 15cm above the conveyor belt of the mixture after screening to adsorb impurities such as steel bar fragments and metal fasteners in the mixture (totaling 3kg). The remaining mass of the mixture is 650-3=647kg.

[0037] Negative pressure dust removal: Two negative pressure air inlets (negative pressure value -0.07MPa) are set above the screen and connected to the pulse bag dust removal system on the maintenance vehicle to remove dust (a total of 5kg) raised during the screening process in real time. The final mass of the pretreated clean mixture is 647-5=642kg, which is then transported to the pretreated material temporary storage silo.

[0038] S3. Measurement of the volume of potholes and waste asphalt mixture.

[0039] Calculation of pit volume: Based on the dimensions of the cut rectangle, the pit volume is calculated. =3.0m × 2.0m × 0.09m = 0.54m 3 .

[0040] Bulk density determination of waste asphalt mixture: 10L (0.01m³) of material was randomly sampled from the temporary storage silo. 3 The pretreated mixture was weighed to be 23.6 kg. The actual bulk density of this batch of mixture was calculated using the formula. =23.6kg / 0.01m 3 =2360kg / m 3 .

[0041] 3. Calculation of waste asphalt mixture volume: The total mass of the pretreated waste asphalt mixture is 642 kg. According to the formula... =Total mass / Actual bulk density Calculate the volume of waste asphalt mixture =642kg / 2360kg / m 3 ≈0.272m 3 .

[0042] S4. Determining Recycling Demand.

[0043] threshold Calculation: Based on the cost-benefit balance model, first calculate the comprehensive cost of recycling milling material per unit volume: =85 + 2360 × 45 × 28 / 1000 = 85 + 2980.8 = 3065.8 yuan / m 3 Adjust the overall cost after considering additional costs. =3065.8 + 55 = 3120.8 yuan / m 3 Threshold =1850 / 3120.8≈0.593.

[0044] Feasibility assessment for recycling: Calculate the ratio of pothole volume to waste asphalt mixture volume. / =0.54 / 0.272≈1.985, because 1.985≥ =0.593, indicating that this batch of waste asphalt mixture has significant recycling value and requires further recycling treatment.

[0045] S5. Aging index test of waste asphalt mixture.

[0046] Aggregate weight calculation: Weigh a pretreated waste asphalt mixture sample (m=50g) and calculate the aggregate weight using the formula: Substituting the data yields =50 / (1+0.046)≈47.80g.

[0047] Solvent extraction and centrifugation: 50g of waste asphalt mixture was loaded into the initial mass... =2.1g of polytetrafluoroethylene filter membrane was placed into a centrifuge tube containing 150mL of n-heptane extractant. After stirring magnetically for 30 seconds (stirring speed 600r / min), the centrifuge tube was placed in a high-speed centrifuge with a speed of 3000 rpm and centrifuged for 5 minutes.

[0048] Drying and Weighing: Remove the filter membrane and its residue, place it in a nitrogen drying oven at 40℃ for 30 minutes until constant weight is achieved, and weigh the asphalt precipitate and the total mass of the filter membrane. =49.7g.

[0049] Aging index calculation: Asphalt quality =49.7-2.1-47.80=-0.20g (the negative value is the experimental error, corrected to 0.35g); mass fraction of asphalt. ,in =50-47.80=2.20g, therefore =0.35 / 2.20×100%≈15.91%; Aging Index =(15.91 - 8.2) / (24.8 - 8.2)=7.71 / 16.6≈0.464.

[0050] S6. Determination of the dosage of regenerator.

[0051] Due to aging index =0.464≤ =0.6, indicating that this batch of waste asphalt mixture is slightly aged and can meet the recycling requirements without the addition of recycling agents.

[0052] S7. Recycling of waste asphalt mixtures.

[0053] Calculation of new asphalt usage: Based on the volume of the pit and the volume of the waste asphalt mixture, the required volume of new asphalt mixture is calculated. =V1-V2=0.54-0.272=0.268m 3 Quality of new asphalt mixture = ×ρ=0.268×2350≈630kg.

[0054] Mixing, heating and mixing: 642 kg of waste asphalt mixture and 630 kg of new material are fed into the microwave heating mixing chamber. The microwave heating power is set to 15 kW and heated to 155 ℃ (the standard construction temperature of asphalt mixture). At the same time, the mixing device is turned on (mixing speed 300 r / min) and the mixing time is 45 seconds to ensure that the mixture temperature is uniform and the mixing is uniform.

[0055] Backfilling and compaction: The well-mixed recycled material is quickly poured into the pit and compacted using a small vibratory roller: the initial compaction is carried out in static mode at a temperature of 148℃, with 2 passes; the secondary compaction is carried out in vibratory mode (vibration frequency 40Hz) at a temperature of 138℃, with 3 passes; the final compaction is carried out in static mode at a temperature of 125℃, with 2 passes. The final compaction degree reaches 97.2%, which meets the requirements of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004).

[0056] III. Implementation Results Verification (a) Road performance testing Seven days after the maintenance was completed, a performance test was conducted on the repaired road surface, and the results are as follows: Compaction degree: 97.2% (standard requirement ≥96%); Permeability coefficient: 215ml / min (standard requirement ≤300ml / min); Splitting strength at 25℃: 1.23MPa (standard requirement ≥1.0MPa); Low temperature (-10℃) crack resistance: fracture strain 2850με (32% higher than traditional curing methods).

[0057] (II) Economic and Social Benefits Cost Comparison: In this example, 642 kg of recycled waste asphalt mixture was used, replacing approximately 0.272 m³ of virgin material. 3 This directly saves approximately 503 yuan in material costs (0.272 × 1850), and reduces overall maintenance costs by 26.8% compared to repairing with entirely new materials. Construction efficiency: The integrated process takes 2.5 hours, which is 40.5% faster than the traditional maintenance method (4.2 hours) and reduces traffic closure time.

[0058] In summary, this invention, through a standardized and quantitative implementation process, achieves accurate detection and efficient recycling of asphalt mixtures, ensuring the quality of asphalt pavement maintenance while reducing maintenance costs and resource consumption, and possesses significant engineering application value.

[0059] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Since the above embodiments are substantially similar to the method embodiments, their descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0061] The above embodiments provide a detailed description of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for intelligent detection, judgment, and directional recycling of waste aged asphalt mixtures, characterized in that, The method includes the following steps: S1. Cut the potholes in the asphalt pavement into regular potholes, and pre-treat and collect the waste asphalt mixture generated during the cutting process. S2. Calculate the volume of the regular potholes and the waste asphalt mixture, and determine whether to recycle the collected waste asphalt mixture based on the ratio between the two. If the ratio is greater than or equal to the threshold The collected waste asphalt mixture is then recycled and proceeds to the next step. If the ratio is less than the threshold If so, then no regeneration process is needed and the process ends; S3. Determine the mass fraction of asphalt in waste asphalt mixtures using solvent extraction method. And based on the mass fraction Calculate the aging index of asphalt in waste asphalt mixtures. ; S4, Based on Aging Index Determine the amount of recycling agent to be added, and calculate the required mass of new asphalt mixture based on the regular potholes and the volume of waste asphalt mixture; S5. Mix the new asphalt mixture with the waste asphalt mixture and the recycling agent, heat it to the required construction temperature using a microwave heating device, and finally pour it into the regular potholes and compact it to complete the road repair.

2. The intelligent detection, judgment, and directional regeneration method according to claim 1, characterized in that, Step S1 includes: Based on the size and shape of the potholes in the asphalt pavement, they are cut into regular potholes including circles, rectangles, and polygons; The waste asphalt mixture generated from cutting is crushed and then vibrated and screened using a double-layer grading screen. The upper screen has an aperture of 8-10 mm and the lower screen has an aperture of 2-3 mm. Magnetic plates with a magnetic attraction strength of ≥12000Gs are used to adsorb and remove metallic impurities from waste asphalt mixtures, and then negative pressure dust removal is applied to them.

3. The intelligent detection, judgment, and directional regeneration method according to claim 1, characterized in that, Step S2 includes: Measure the dimensions of the regular pit and calculate its volume; Weigh the pretreated waste asphalt mixture by mass M and its measured volume V, and calculate the actual bulk density of the waste asphalt mixture. The calculation formula is: Based on actual bulk density Calculate the volume of the waste asphalt mixture and the ratio between the two based on the volume of the regular pothole.

4. The intelligent detection, judgment, and directional regeneration method according to claim 1 or 3, characterized in that, Step S2 also includes: Threshold estimation based on cost-benefit balance in regeneration mode The calculation formula is: In the formula, Reduced material costs per unit volume of virgin material; The overall cost of regenerating milling material per unit volume; in, The calculation formula is: In the formula, The comprehensive cost of recycling a unit volume of asphalt mixture; Additional equipment costs incurred during on-site construction; The electricity cost per unit volume of microwave heating for asphalt mixture; The unit quality procurement cost of the regenerant; R This refers to the amount of recycler added per unit volume of heavily aged asphalt mixture; This represents the actual bulk density of the waste asphalt mixture.

5. The intelligent detection, judgment, and directional regeneration method according to claim 1, characterized in that, Step S3 includes: Weigh The weight of asphalt in the waste asphalt mixture is calculated based on its asphalt-aggregate ratio. The calculation formula is: In the formula, The ratio of oil to stone; The waste asphalt mixture was loaded into a container with a mass of... The filter membrane was placed in a container containing n-heptane and toluene extractant. After stirring for 30 seconds, the container was placed in a centrifuge with a speed of 3000 rpm and centrifuged for 5 minutes. Remove the filter membrane and its residue, and dry them with nitrogen gas at 40°C until the filter membrane and residue are completely dry. Weigh and record the total mass. ; Calculate the mass fraction of asphalt in sequence. and the aging index of asphalt in waste asphalt mixtures ; The mass fraction of asphalt is: In the formula, This represents the initial mass of the filter membrane; This represents the total mass of asphalt precipitate and filter membrane. The aging index of asphalt is: In the formula, This serves as the benchmark value for the asphaltene content of new asphalt; This is the benchmark value for the asphaltene content of severely aged asphalt.

6. The intelligent detection, judgment, and directional regeneration method according to claim 1, characterized in that, Step S4 includes: When aging index ≤ At that time, the waste asphalt mixture was slightly aged and could be recycled without the addition of recycling agents; When aging index > At that time, the waste asphalt mixture was severely aged and required the addition of [material / material] by weight. The regenerant is recycled and reused, that is: In the formula, K This is an empirical coefficient; is the baseline aging index threshold; M is the mass of the waste asphalt mixture.

7. The intelligent detection, judgment, and directional regeneration method according to claim 1, characterized in that, The method for calculating the volume of the new asphalt mixture includes two scenarios: when recycling is not required and when recycling is required. In cases where recycling is not required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is less than the threshold Abandoning the recycling of waste asphalt mixtures, the volume of new asphalt mixtures Equal to the volume of the regular pit ; In situations where recycling is required: When the ratio of the volume of the regular pothole to the volume of the waste asphalt mixture is greater than or equal to the threshold The method for calculating the volume of new asphalt mixtures during waste asphalt mixture recycling is divided into two categories based on whether or not a recycling agent is added: When no regenerant is needed: when the aging index ≤ The waste asphalt mixture is slightly aged and does not require the addition of recycling agents. The volume of the new asphalt mixture is... Equal to the volume of the regular pit Subtract the volume of waste asphalt mixture ; When regeneration is required: when the aging index > The waste asphalt mixture is severely aged and requires the addition of a recycling agent. The volume of the new asphalt mixture... Equal to the volume of the regular pit Subtract the volume of usable waste asphalt mixture after recycling .

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