CN110342856B - Pavement material based on image processing - Google Patents

Pavement material based on image processing Download PDF

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Publication number
CN110342856B
CN110342856B CN201910561971.6A CN201910561971A CN110342856B CN 110342856 B CN110342856 B CN 110342856B CN 201910561971 A CN201910561971 A CN 201910561971A CN 110342856 B CN110342856 B CN 110342856B
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parts
mixture
pavement material
pavement
image processing
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CN110342856A (en
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曾峰
王随原
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China Road and Bridge Corp
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China Road and Bridge Corp
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/34Metals, e.g. ferro-silicon
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02Macromolecular compounds
    • C04B26/26Bituminous materials, e.g. tar, pitch
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/95Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for recognising patterns
    • G06K9/62Methods or arrangements for pattern recognition using electronic means
    • G06K9/6267Classification techniques
    • G06K9/6268Classification techniques relating to the classification paradigm, e.g. parametric or non-parametric approaches
    • G06K9/6269Classification techniques relating to the classification paradigm, e.g. parametric or non-parametric approaches based on the distance between the decision surface and training patterns lying on the boundary of the class cluster, e.g. support vector machines
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration
    • G06T5/001Image restoration
    • G06T5/002Denoising; Smoothing
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration
    • G06T5/20Image enhancement or restoration by the use of local operators
    • G06T5/30Erosion or dilatation, e.g. thinning
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/0002Inspection of images, e.g. flaw detection
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/10Segmentation; Edge detection
    • G06T7/13Edge detection
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075Uses not provided for elsewhere in C04B2111/00 for road construction

Abstract

The invention discloses a pavement material based on image processing, which comprises the following materials in parts by weight: 10-23 parts of GA asphalt, 60-85 parts of macadam, 10-15 parts of rubber powder, 15-25 parts of epoxy resin powder, 1-2 parts of magnetic powder, 1-3 parts of asphalt-based carbon fiber, 1-3 parts of stabilizer, 6-10 parts of acetone and 10-15 parts of stearic acid; wherein, the magnetic powder is the powder of magnetic materials of iron, cobalt, nickel and alloys thereof. The pavement material provided by the invention has the beneficial effects of high temperature resistance and long service life.

Description

Pavement material based on image processing
Technical Field
The invention relates to the field of road engineering construction. More specifically, the present invention relates to a pavement material based on image processing.
Background
The modernization process speeds up the pace of highway construction in China, and as the landform of China is complex, a plurality of highways are loaded with loads, the track damage is more, and the highway overhaul is frequent, financial pressure is brought to the country, and inconvenience is brought to citizens to go out. Asphalt is a common pavement material, and is usually coated in sand, gravel, crushed stone or a mixture thereof, and although the asphalt can meet the use requirement of a road in a short time, the service life of the asphalt needs to be improved.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is a further object of the present invention to provide an image processing-based pavement material that has a long service life and good high temperature resistance.
To achieve these objects and other advantages in accordance with the present invention, there are provided a grease composition comprising 10 to 23 parts of GA asphalt, 60 to 85 parts of crushed stone, 10 to 15 parts of rubber powder, 15 to 25 parts of epoxy resin powder, 1 to 2 parts of magnetic powder, 1 to 3 parts of asphalt-based carbon fiber, 1 to 3 parts of stabilizer, 6 to 10 parts of acetone, and 10 to 15 parts of stearic acid; wherein the magnetic powder is powder of magnetic materials of iron, cobalt, nickel and alloys thereof;
the pavement material is prepared by the following preparation method:
weighing broken stone, rubber powder, epoxy resin powder and magnetic powder in parts by weight, ball-milling, sieving, and magnetizing by a magnetizer in batches to obtain a mixture A; the magnetic powder accounts for 1-1.5 wt% of the total of the crushed stone, the rubber powder, the epoxy resin powder and the magnetic powder, and under the condition of no pressing, the magnetic powder is distributed in the powder in a manner that large-area agglomeration is avoided under the action of an external magnetic field in batches; the epoxy resin powder can improve the high-temperature resistance of the pavement material;
step two, heating GA asphalt to 160-180 ℃, adding asphalt-based carbon fibers in parts by weight, cooling to 80-100 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 60-65 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
step four, taking another raw material, repeating the steps one to three to obtain a mixture A and a mixture C, adding the mixture A and the mixture C into asphalt mixture mixing equipment, wherein the mixing equipment does not contain ferromagnetic substances, adding 1-10 parts by weight of surface modifier according to the proportion, stirring to obtain different pavement materials, placing the obtained pavement materials in a drying oven at 50 ℃ for 72 hours, repeatedly rolling for 5000 times through a flat car simulation rut rolling, and screening the addition amount of the surface modifier when the pavement condition index is highest and the pavement damage degree is lowest by utilizing a buckling method and an image processing technology, wherein the addition amount is the optimal addition amount of the surface modifier, and the optimal addition amount is 3 parts;
by simulating a rut rolling experiment in an environment with a temperature higher than normal outdoor temperature, screening out the optimal addition amount of the surface modifier in a short time by using an image processing technology;
step five, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, wrapping the magnetic powder in the mixture A by the asphalt in the mixture C, and increasing the internal acting force of the pavement material to prolong the service life of the pavement material under the action of the magnetic force among the magnetic powder in the continuous stirring process, wherein the pavement material has a more compact structure, and has higher viscosity and strong bonding capability; the mixing equipment does not contain ferromagnetic substances, so that the magnetic material is prevented from being absorbed on the equipment, the surface modifier with the optimal addition amount is added while stirring, and the pavement material is obtained by continuously stirring.
Preferably, the stabilizer is polyvinyl alcohol or ethylene glycol.
Preferably, the diameter of the pitch-based carbon fiber is 0.9 to 2.2 mm.
Preferably, in the first step, the ball milling temperature is 30-45 ℃, and the screening mesh number is 160-220 meshes.
Preferably, the step one further comprises a pretreatment of the magnetic powder, wherein the pretreatment comprises the following steps: pressing, calcining and micronizing the magnetic powder; the calcination process comprises primary calcination and secondary calcination, wherein the primary calcination temperature is 700-900 ℃, the calcination time is 10-12 hours, the secondary calcination temperature is 1200-1400 ℃, and the calcination time is 4-8 hours.
Preferably, the processing time of the magnetizer in the step one is 2 to 3 seconds.
Preferably, the stirring time in the fourth step is 10-18 h.
The invention at least comprises the following beneficial effects: firstly, the pavement material based on image processing provided by the invention is high-temperature resistant, strong in high-temperature bearing capacity and long in service life; secondly, the pavement material provided by the invention is simple to prepare, wide in source, low in cost and suitable for large-scale popularization; thirdly, the invention firstly proposes that the magnetic material is added into the pavement material, thereby increasing the stability of the obtained pavement material and improving the high temperature resistance of the pavement material. The service life of the device is prolonged.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail with reference to specific examples, so that those skilled in the art can implement the invention with reference to the description.
Example 1
Firstly, pressing, calcining and micronizing magnetic powder; wherein the magnetic powder is powder of magnetic materials of iron, cobalt, nickel and alloys thereof; the calcination process comprises primary calcination and secondary calcination, wherein the primary calcination temperature is 700 ℃, the calcination time is 10 hours, the secondary calcination temperature is 1200 ℃, and the calcination time is 4 hours; weighing the macadam, the rubber powder, the epoxy resin powder and the magnetic powder according to the weight parts, carrying out ball milling, sieving, magnetizing by a magnetizer, wherein the ball milling temperature is 30 ℃, the sieving mesh number is 160 meshes, and the processing time by the magnetizer is 3s to obtain a mixture A;
step two, heating GA asphalt to 160 ℃, adding asphalt-based carbon fiber in parts by weight, cooling to 80 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 60 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
step four, taking another raw material, repeating the steps one to three to obtain a mixture A and a mixture C, adding the mixture A and the mixture C into asphalt mixture mixing equipment, wherein the mixing equipment is made of an alloy material not containing iron, cobalt and nickel, 1-10 parts by weight of a surface modifier is added according to a proportion, different pavement materials are obtained by stirring, the obtained pavement materials are placed in a drying oven at the temperature of 50 ℃ for 72 hours, rolling is repeatedly carried out for 5000 times through a flat car simulation rut rolling, and the addition amount of the surface modifier is selected as the optimal addition amount of the surface modifier when the pavement condition index is the highest and the pavement damage degree is the lowest by utilizing a deduction method and an image processing technology, wherein the optimal addition amount is 3 parts; by simulating a rut rolling experiment in an environment with a temperature higher than normal outdoor temperature, the optimal addition amount of the surface modifier is quickly screened out in a short time by using an image processing technology;
the evaluation standard of the experimental pavement is based on the pavement condition index PCI, wherein
In the formula (I), the compound is shown in the specification,
DR: the pavement damage rate is the percentage (%) of the sum of the reduced damaged areas of various damages and the area of the researched pavement;
Ai: damaged area (m) of class i road surface2);
A: area of road surface studied (m)2);
wi: weight of class i road surface damage; the road surface damage types and weights are shown in table 1;
a0: 15.00 for asphalt pavement, 10.66 for cement concrete pavement and 10.10 for gravel pavement;
a1: 0.412 is adopted for asphalt pavement, 0.461 is adopted for cement concrete pavement, and 0.487 is adopted for sand pavement;
TABLE 1 road surface damage types and weights
The image processing technology of the invention refers to a simple pavement damage detection system, which comprises a CCD camera, an image acquisition card, image storage and display software and image processing and evaluation software; the image processing method is a quadtree splitting and merging based method. The image processing method of the quadtree splitting and merging comprises the steps of firstly smoothing and enhancing an image, then carrying out edge detection by using a Sobel operator, then connecting discrete edges and skeletonization by using expansion, simultaneously trimming some isolated points or generated burrs, finally optimizing an obtained crack image by using the quadtree splitting and merging, then evaluating the length or area of road damage, and simultaneously adding some characteristic information (such as gray level average value, variance, third moment, invariant moment, average gradient, average value of gradient vector directions, some characteristics based on a texture energy map and some characteristics based on a gray level co-occurrence matrix) in an original gray level image to characteristic information of processed binary images such as connected group elements, appearance ratio, saturation, projection histogram and the like to form a sample. And (4) classifying by using an SVM (support vector machine), and finally evaluating a classification result. The method is not only suitable for crack road damage, but also suitable for crack or block crack road damage.
In the experimental process, the pavement materials obtained by adding the surface modifier are better than the pavement materials obtained by not adding the surface modifier, the pavement material performance is not increased gradually and the gradient of the pavement material performance is better, and along with the increase of the addition of the surface modifier, the performance of the pavement material is gradually better and better to reach a better value, and then the performance of the pavement material is worse and worse. With the increase of the addition amount of the surface modifier, the cracking or block area of the pavement material is greatly reduced, but after the optimal addition amount is reached, the surface modifier is continuously added, and the road damage of cracks is increased. The invention utilizes the image processing technology to obtain the optimal addition amount of the surface modifier.
And step five, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, wherein the mixing equipment does not contain ferromagnetic substances, so that the magnetic material is prevented from being absorbed on the equipment, adding the surface modifier in the optimal adding amount while stirring, and continuously stirring to obtain the pavement material. When the obtained pavement material is actually applied, a layer of asphalt surface with the thickness of 2-3 cm needs to be paved.
To investigate the use properties of the pavement material obtained in example 1, a 500-meter test road section was laid in the Hangzhou region using the pavement material obtained in example 1.
Firstly, evaluating the road surface bearing capacity of a test road section, adopting a structural strength coefficient SSI as an index, and defining the road surface structural strength coefficient SSI as follows for one year in the service period of the test road section:
SSI=ls/lr
wherein SSI is a road surface strength coefficient;
lsdesigning a deflection value (0.01mm) for the pavement;
lrthe deflection value (0.01mm) was represented for the road surface.
The road surface structural strength coefficient SSI of the test road section is 1.47; the evaluation index was excellent.
Secondly, evaluating the road surface running quality of the test road section, wherein the invention adopts an international flatness index IRI as an index, and defines the flatness index IRI of the test road section as:
IRI=a+bBI;
wherein BI is a test result of the flatness measuring equipment;
and a and b are calibration coefficients, wherein a is 2.97, and b is 0.00136.
The flatness index IRI of the test road section is 2.2, and the evaluation index is excellent.
And finally, evaluating the comprehensive condition of the road surface of the test road section, wherein the invention adopts the road surface condition index PCI as an index, the road surface condition index PCI of the test road section is 98, and the evaluation index is excellent.
Therefore, the pavement material obtained in the embodiment 1 has excellent service performance and meets the national highway service standard.
Using the pavement material obtained in example 1, a test section having a length of 150 m and a width of 4 m was laid, and the durability of the obtained pavement material was tested by driving the test platform vehicle reciprocally on the test section by unmanned automatic control. In order to simulate the reduction and damage of the road surface function caused by the running of a large vehicle, a trailer body with 3 shafts and 10 wheels is used, and under the condition that the load of a test flat car is kept the same, the maximum design speed per hour is 30km/h, and the general running speed is 10-20 km/h. And (5) operating the test flat car for 24 hours every day and operating the test flat car for 380d every day, and inspecting whether obvious cracks and other damage phenomena appear on the road surface. Therefore, the pavement material obtained in the example 1 has good durability and long service life.
The pavement material obtained in the embodiment 1 is paved outside a heating pipe to test the high temperature resistance of the pavement material, the heating pipe is slowly heated to 40 ℃, and the phenomena of cracks, oil bleeding and deformation do not occur in the pavement material paved outside the heating pipe after 72 hours of observation, so that the pavement material provided by the invention has higher high temperature resistance.
Example 2
Firstly, pressing, calcining and micronizing magnetic powder; wherein the magnetic powder is powder of magnetic materials of iron, cobalt, nickel and alloys thereof; the calcination process comprises primary calcination and secondary calcination, wherein the primary calcination temperature is 900 ℃, the calcination time is 12 hours, the secondary calcination temperature is 1400 ℃, and the calcination time is 8 hours; weighing the macadam, the rubber powder, the epoxy resin powder and the magnetic powder according to the weight parts, carrying out ball milling, sieving, and magnetizing by a magnetizer in batches, wherein the ball milling temperature is 45 ℃, the sieving mesh number is 220 meshes, and the processing time by the magnetizer is 2s, so as to obtain a mixture A;
step two, heating GA asphalt to 160 ℃, adding asphalt-based carbon fiber in parts by weight, cooling to 80 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 60 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
and step four, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, wherein the mixing equipment does not contain ferromagnetic substances, so that the magnetic material is prevented from being absorbed on the equipment, adding the surface modifier in the optimal adding amount while stirring, and continuously stirring to obtain the pavement material.
Example 3
Firstly, pressing, calcining and micronizing magnetic powder; wherein the magnetic powder is powder of magnetic materials of iron, cobalt, nickel and alloys thereof; the calcination process comprises primary calcination and secondary calcination, wherein the primary calcination temperature is 800 ℃, the calcination time is 11 hours, the secondary calcination temperature is 1300 ℃, and the calcination time is 6 hours; weighing the macadam, the rubber powder, the epoxy resin powder and the magnetic powder according to the weight parts, carrying out ball milling, sieving, and magnetizing by a magnetizer in batches, wherein the ball milling temperature is 40 ℃, the sieving mesh number is 200 meshes, and the processing time by the magnetizer is 2s, so as to obtain a mixture A;
step two, heating GA asphalt to 170 ℃, adding asphalt-based carbon fiber in parts by weight, cooling to 90 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 63 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
and step four, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, wherein the mixing equipment does not contain ferromagnetic substances, so that the magnetic material is prevented from being absorbed on the equipment, adding the surface modifier in the optimal adding amount while stirring, and continuously stirring to obtain the pavement material.
Comparative example 1
Weighing broken stone, rubber powder and epoxy resin powder in parts by weight, carrying out ball milling, and sieving at the ball milling temperature of 30 ℃ with the sieve mesh number of 160 meshes to obtain a mixture A;
step two, heating GA asphalt to 160 ℃, adding asphalt-based carbon fiber in parts by weight, cooling to 80 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 60 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
and step four, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, wherein the mixing equipment does not contain ferromagnetic substances, so that the magnetic material is prevented from being absorbed on the equipment, adding the surface modifier in the optimal adding amount while stirring, and continuously stirring to obtain the pavement material.
The pavement materials obtained in the embodiment 1 and the comparative example 1 are selected and detected by a digital display pavement material strength tester, and the result shows that the strength of the pavement material obtained in the embodiment 1 is higher than that of the pavement material obtained in the comparative example 1, which shows that the addition of the magnetic powder is beneficial to improving the strength of the pavement material.
Using the pavement materials obtained in example 1 and comparative example 1, test sections of 150 m in length and 4 m in width were laid, respectively, and the durability of the obtained pavement materials was tested by running the unmanned automatic control test flat car back and forth on the two test sections. In order to simulate the reduction and damage of the road surface function caused by the running of a large vehicle, a trailer body with 3 shafts and 10 wheels is used, and under the condition that the load of a test flat car is kept the same, the maximum design speed per hour is 30km/h, and the general running speed is 10-20 km/h. The test flat car is operated for 12 hours every day and continuously driven for 50 days, the pavement damage is detected by using an image processing technology in the whole process, the pavement material obtained in the comparative example 1 firstly has a crack phenomenon, and the pavement material obtained in the example 1 does not have the crack phenomenon in the test time; after the test is finished, crack detection is performed on the pavement materials obtained in the example 1 and the comparative example 1, and the total crack rate of the pavement material obtained in the example 1 is far lower than that of the pavement material obtained in the comparative document 1. This is because the addition of the magnetic material increases the stability of the internal structure of the pavement material, thereby enhancing the durability of the pavement material.
As described above, the present invention has at least the following advantageous effects: firstly, the pavement material based on image processing provided by the invention is high-temperature resistant, strong in high-temperature bearing capacity and long in service life; secondly, the pavement material provided by the invention is simple to prepare, wide in source, low in cost and suitable for large-scale popularization; thirdly, the invention firstly proposes that the magnetic material is added into the pavement material, thereby increasing the stability of the obtained pavement material and improving the high temperature resistance of the pavement material. The service life of the device is prolonged.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention is intended, and further modifications may readily occur to those skilled in the art, whereby the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (7)

1. The pavement material based on image processing is characterized by comprising the following materials in parts by weight:
10-23 parts of GA asphalt, 60-85 parts of macadam, 10-15 parts of rubber powder, 15-25 parts of epoxy resin powder, 1-2 parts of magnetic powder, 1-3 parts of asphalt-based carbon fiber, 1-3 parts of stabilizer, 6-10 parts of acetone and 10-15 parts of stearic acid; wherein the magnetic powder is powder of magnetic materials of iron, cobalt, nickel and alloys thereof;
the pavement material is prepared by the following preparation method:
weighing broken stone, rubber powder, epoxy resin powder and magnetic powder in parts by weight, ball-milling, sieving, and magnetizing by a magnetizer in batches to obtain a mixture A;
step two, heating GA asphalt to 160-180 ℃, adding asphalt-based carbon fibers in parts by weight, cooling to 80-100 ℃, and sequentially adding acetone and stearic acid in parts by weight to obtain a mixture B;
step three, cooling the mixture B obtained in the step two to 60-65 ℃, and adding a stabilizer in parts by weight to obtain a mixture C;
step four, taking another raw material, repeating the steps one to three to obtain a mixture A and a mixture C, adding the mixture A and the mixture C into asphalt mixture mixing equipment, wherein the mixing equipment does not contain ferromagnetic substances, adding 1-10 parts by weight of surface modifier according to the proportion, stirring to obtain different pavement materials, placing the obtained pavement materials in a drying oven at 50 ℃ for 72 hours, repeatedly rolling for 5000 times through a flat car simulation rut rolling, and screening the addition amount of the surface modifier when the pavement condition index is highest and the pavement damage degree is lowest by utilizing a buckling method and an image processing technology, wherein the addition amount is the optimal addition amount of the surface modifier, and the optimal addition amount is 3 parts;
the image processing technology is a simple pavement damage detection system and comprises a CCD camera, an image acquisition card, image storage and display software and image processing and evaluation software; the image processing method is a quadtree splitting and merging based method; the image processing method of the quadtree splitting and merging comprises the steps of firstly smoothing and enhancing an image, then carrying out edge detection by using a Sobel operator, then using expansion to communicate discrete edges and skeletonization, simultaneously trimming some isolated points or generated burrs, finally using the quadtree splitting and merging, optimizing an obtained crack image, evaluating the length or area of road damage, simultaneously providing characteristic information of communication group elements, appearance ratio, saturation and projection histogram in a processed binary image, and adding the characteristic information in an original gray image, wherein the characteristic information in the original gray image is a sample consisting of average gray value, variance, third moment, invariant moment, average gradient, average value of gradient vector direction, texture energy image-based characteristics and gray level co-occurrence matrix-based characteristics; classifying by using an SVM (support vector machine), and finally evaluating a classification result;
and step five, adding the mixture C obtained in the step three into asphalt mixture mixing equipment, adding the mixture A obtained in the step one in batches, adding the surface modifier in the optimal adding amount while stirring to obtain the pavement material, wherein the mixing equipment does not contain ferromagnetic substances.
2. The image-processing-based pavement material according to claim 1, wherein the stabilizer is polyvinyl alcohol or ethylene glycol.
3. The image-processing-based pavement material according to claim 1, wherein the pitch-based carbon fibers have a diameter of 0.9 to 2.2 mm.
4. The image processing-based pavement material according to claim 1, wherein the ball milling temperature in the first step is 30-45 ℃, and the mesh number is 160-220.
5. The image processing-based pavement material according to claim 1, wherein the step one further comprises a pretreatment of the magnetic powder, wherein the pretreatment comprises: pressing, calcining and micronizing the magnetic powder; the calcination process comprises primary calcination and secondary calcination, wherein the primary calcination temperature is 700-900 ℃, the calcination time is 10-12 hours, the secondary calcination temperature is 1200-1400 ℃, and the calcination time is 4-8 hours.
6. The image processing-based pavement material according to claim 1, wherein the processing time of the magnetizer in the first step is 2-3 s.
7. The image processing-based pavement material according to claim 1, wherein the stirring time in the fourth step is 10-18 h.
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