A method for detecting and evaluating the durability of road markings

Abstract

The present invention discloses a method for detecting and evaluating the durability of road markings, which includes manufacturing an asphalt rut plate coated with markings; placing the asphalt rut plate flat in the horizontal groove of an accelerated loading test device; setting the parameters of the accelerated loading test device to conduct loading tests according to the set number of loadings. After each loading test is completed, photos of the changes in the markings are obtained by taking pictures, and finally, a retroreflective marking measuring instrument is used to measure the retroreflective brightness coefficient on the surface of the asphalt rut plate; the comprehensive durability score P of the markings on the corresponding asphalt rut plate is calculated according to three detection indexes. The detection method of the present application can analyze and propose the comprehensive durability score P of the durability of the road markings based on the changes in the appearance and reflective performance of the road markings under the action of vehicle loads during travel. According to P, the durability level can be obtained, and this durability level can provide a basis and reference for the selection of the maintenance timing of the markings.

Description

Technical Field

[0001] The present invention relates to the field of road marking detection, and particularly relates to a method for detecting and evaluating the durability of road markings. Background Art

[0002] As one of the most important components of traffic infrastructure, road markings mainly serve to guide the driving of motor vehicles and non-motor vehicles on the road. This also makes road markings the "lifeline" for drivers' driving safety. Currently, the detection of road markings mainly focuses on the performance of the marking paint itself and glass beads. For example, the industry standard - "Pavement Marking Paint" (JT / T 280-2004) classifies the marking paint and sets standard requirements for the performance of various types of markings, such as density, viscosity, thermal stability, film appearance, non-sticking tire dry specimen, covering power, abrasion resistance, water resistance, alkali resistance, adhesion, flexibility, freeze-thaw stability, low-temperature crack resistance, artificial accelerated weather resistance, etc. At the same time, the corresponding test procedures and requirements are given: such as the national standard - "Quality Requirements and Test Methods for Road Traffic Markings" (GB / T 16311-2009). Requirements for the performance of road markings are put forward, such as: appearance quality, shape and size, marking thickness, chromaticity performance, photometric performance, and skid resistance performance, and the corresponding performance detection procedures and requirements are given; such as the national standard - "Glass Beads for Road Markings" (GB / T 24722-2020), which puts forward requirements for the appearance, roundness rate, particle size distribution, density, refractive index, water resistance, magnetic particle content, etc. of glass beads and describes its detection method.

[0003] In existing standards, usually performance requirements are put forward for the marking paint and glass beads themselves, but the specific road use performance durability of road markings is not specified, and there is no specific detection method. However, the road use performance durability of road markings is extremely important for practical applications and has important reference value for judging the service life and maintenance cycle of road markings. Therefore, there is an urgent need in the market for a detection method that can reasonably evaluate the durability of road markings. Summary of the Invention

[0004] Aiming at the above problems, the present invention aims to provide a detection method that can effectively reflect the durability of road markings.

[0005] To achieve the technical purpose, the solution of the present invention is: a method for detecting and evaluating the durability of road markings, and the specific steps are as follows:

[0006] S1. Make asphalt rutting plates coated with road markings, the number of asphalt rutting plates is greater than or equal to 3, and number the asphalt rutting plates. The asphalt rutting plates are cured for more than 24 hours in an environment with a temperature of 23±2°C and a humidity of 50±10%;

[0007] S2. Place the asphalt rutting plate flat in the horizontal groove of the accelerated loading test device, record its initial appearance state, select at least 3 test points on each asphalt rutting plate, and use a retroreflective marking measuring instrument to measure and record the initial retroreflective brightness coefficient of each test point;

[0008] S3. Set the parameters of the accelerated loading test device, with the rolling frequency being 7200 ± 200 times per hour, the tire pressure being 750 ± 50 kPa, the width of the test wheel being 80 ± 5 mm, and the speed of the test wheel being 30 ± 2 km / h;

[0009] Conduct the loading test according to the set number of loadings. After each loading test is completed, obtain photos of the marking changes by taking pictures, collect the shed glass beads at the same time, and weigh them to obtain the shed mass m0; finally, use a retroreflective marking measuring instrument to measure the retroreflective brightness coefficient c on the surface of the asphalt rutting plate;

[0010] S4. Calculate the obtained appearance quality change S, the proportion G of the shed glass bead area, and the retroreflective brightness change R respectively, and calculate the comprehensive durability score P of the marking on the corresponding asphalt rutting plate according to the three detection indicators.

[0011] Preferably, the calculation formula for the comprehensive durability score P is:

[0012]

[0013] Among them: k1 is the weight coefficient of the appearance quality change, k2 is the weight coefficient of the proportion of the shed glass bead area, and k3 is the weight coefficient of the retroreflective brightness coefficient;

[0014] Among them: a is the appearance quality damage rate, b is the proportion of the shed area, and a and b are obtained by analyzing the marking change photos by the grayscale method; in the calculation formula of the score P, the value range of a is: 0 ≤ a ≤ 25%, the value range of b is: 0 ≤ b ≤ 20%, and the value range of c is: c ≥ 150 score P calculation formula;

[0015] The evaluation of the durability level is shown in Table 1:

[0016] Comprehensive score P 100≥P≥90 90>P≥80 80>P≥70 70>P≥60 60>P Durability level Excellent Good Medium Poorer Poor

[0017] Preferably, the coating used in the marking is one or more of hot-melt coating, two-component coating, water-based coating, and solvent-based coating; among them, the coating width of the marking is 15 ± 0.5 cm, and the spreading amount of the surface-spread glass beads of the marking is 350 - 450 g / m 2 ;

[0018] The asphalt rutting plates to be tested are of the same size, the markings coated on the asphalt rutting plates have the same thickness, and the edges of the asphalt rutting plates are flat.

[0019] Preferably, during the accelerated loading process in step S3, one or more of the following treatments are continuously applied to the external environment of the asphalt rutting plate: water spraying treatment, hot air treatment, or ultraviolet lamp irradiation treatment.

[0020] In step S3, the number of loading times are 10,000 times, 20,000 times, 30,000 times, 40,000 times, 50,000 times, 100,000 times, and 150,000 times respectively.

[0021] Preferably, in order to simulate the actual aging environment of the marking paint in step S2, when the cumulative number of loading times is 20,000 times, the number of continuous water spraying treatments on the external environment is greater than or equal to 10,000 times; when the cumulative number of loading times is 40,000 times, the number of continuous hot air treatments on the external environment is greater than or equal to 10,000 times; when the cumulative number of loading times is 100,000 times, the irradiation time of the continuous ultraviolet lamp irradiation treatment on the external environment is greater than or equal to 21,600 s.

[0022] Preferably, the detection indexes of the appearance quality change include marking damage and peeling, marking cracking, and significant change in the appearance color of the marking.

[0023] The beneficial effects of the present invention: The detection method of the present application can analyze and propose the comprehensive durability score P of the marking according to the changes in the appearance and reflective performance of the road marking under the action of vehicle load. According to the value of P, the durability grade can be obtained; this durability grade can provide a basis and reference for the selection of the maintenance time of the marking, and can predict the service life of the marking. When the durability grade is poor, the marking needs to be maintained; at the same time, according to the detection and evaluation method of the present application, the marking with poor durability can be found in time, and the road unit can better maintain the old marking, effectively reducing unnecessary marking maintenance and lowering the maintenance cost. Specific embodiments

[0024] The following further describes the present invention in detail with specific embodiments.

[0025] A specific embodiment of the present invention is a method for detecting and evaluating the durability of road markings, and the specific steps are as follows: S1. Fabricate asphalt rutting plates coated with markings. The number of asphalt rutting plates is greater than or equal to 3, and the asphalt rutting plates are numbered. The asphalt rutting plates are cured for more than 24 h in an environment with a temperature of 23 ± 2 °C and a humidity of 50 ± 10%; the paint used in the marking is one or more of hot melt paint, two-component paint, water-based paint, and solvent-based paint; the coating width of the marking is 15 ± 0.5 cm, and the spreading amount of the surface-sprinkled glass beads of the marking is 350 - 450 g / m 2 , and the total weight of the glass beads is m1; the asphalt rutting plates to be detected are of the same size, the thickness of the markings coated on the asphalt rutting plates is the same, and the edges of the asphalt rutting plates are flat.

[0026] S2. Place the asphalt rutting plate flat in the horizontal groove of the accelerated loading test device, record its initial appearance state, select at least 3 test points on each asphalt rutting plate, and use a retroreflective marking measuring instrument to measure and record the initial retroreflective brightness coefficient of each test point.

[0027] S3. Set the parameters of the accelerated loading test device, with a rolling frequency of 7200 ± 200 times per hour, a tire pressure of 750 ± 50 kPa, a test wheel width of 80 ± 5 mm, and a test wheel speed of 30 ± 2 km / h; conduct continuous spraying of water, hot air, and ultraviolet lamp irradiation on the external environment of the asphalt rutting plate.

[0028] Conduct loading tests according to the settings. The loading times are 10,000 times, 20,000 times, 30,000 times, 40,000 times, 50,000 times, 100,000 times, and 150,000 times (the loading times of 50,000 times, 100,000 times, and 150,000 times correspond to the service life of the marking line of 1 year, 3 years, and 5 years under the actual heavy traffic condition). After each loading test is completed, take photos of the marking line changes, and at the same time collect the shed glass beads and weigh them to obtain the shed mass m0 (i.e., the mass of the shed glass beads); finally, use a retroreflective marking measuring instrument to measure the retroreflective brightness coefficient c on the surface of the asphalt rutting plate.

[0029] S4. Calculate the obtained appearance quality change S (the detection indicators of appearance quality change include marking line breakage and shedding, marking line cracking, and significant change in the appearance color of the marking line), the proportion G of the shed glass bead area, and the retroreflective brightness change R, and calculate the comprehensive durability score P of the marking line on the corresponding asphalt rutting plate according to the three detection indicators. The calculation formula for the comprehensive durability score P is:

[0030] Calculation method for the score of the appearance quality change rate S:

[0031] Calculation method for the score of the proportion G of the shed glass bead area:

[0032] Calculation method for the score of the retroreflective brightness change rate R:

[0033] Where: k1 is the weight coefficient of the appearance quality change, k2 is the weight coefficient of the proportion of the shed glass bead area, and k3 is the weight coefficient of the retroreflective brightness coefficient.

[0034] Where: a is the damage rate of appearance quality, b is the proportion of the shedding area. a and b are obtained by analyzing the photos of the marking line change through the grayscale method, where b ≥ m0 / m1 (since it is impossible to completely collect the shed glass beads, so m0 is less than or equal to the mass of the actually shed glass beads); and the value range of a is: 0 ≤ a ≤ 25%, the value range of b is: 0 ≤ b ≤ 20%, and the value range of the retroreflective brightness coefficient c is: c ≥ 150; e in formula (3) is the natural constant, and its value is approximately 2.7182. Maintenance is required when the durability level is poor.

[0035] The price durability levels are shown in Table 1:

[0036] Comprehensive score P 100≥P≥90 90>P≥80 80>P≥70 70>P≥60 60>P Durability level Excellent Good Medium Poorer Poor

[0037] And if any one of the three indicators a, b, and c exceeds the specified value, maintenance should be carried out on the marking line here. When a > 25%, the marking line should be maintained; when b > 20%, the marking line should be maintained; when the retroreflective brightness coefficient c < 150, the marking line should be maintained.

[0038] For the change in appearance quality, in actual applications, the greater the change in appearance quality, the poorer the durability of the marking line, the lower the service quality of the marking line, and the shorter the service life. That is, the larger the value of a, the more serious the damage to the marking line quality. According to the actual engineering application scenario, when the damage rate of the marking line reaches 25%, the damage to the marking line quality is more obvious, and cracks, pollution, etc. occur. 25% is the upper limit value of a. The reflective performance of the marking line is a key indicator for evaluating the road use performance of the marking line. Its reflective performance is related to glass beads. One is the shedding of glass beads, and the other is the retroreflective brightness coefficient of the marking line (the retroreflective function is provided by glass beads). That is, the proportion of the shedding of glass beads b and the retroreflective brightness coefficient c. The upper limit of the proportion of the shedding area of glass beads is 20%, and the lower limit of the retroreflective brightness coefficient is 150. The values of b and c are highly correlated. The larger b is, the smaller c is, and they are inseparable and independent.

[0039] For the coefficients k1, k2, and k3, for different application scenarios, their coefficients are different. For example, for municipal roads, the requirements for appearance quality are relatively high, and the main requirement for reflective performance is the retroreflective brightness coefficient, and its weight change can be adjusted to 0.5, 0.1, 0.4; while for highway sections, the appearance quality problem is less serious compared to the reflective performance problem, so its weight change can be adjusted to 0.4, 0.2, 0.4; for rural roads, the driving speed should not be too fast, and the requirements for night driving safety are relatively high, so its weight change can be adjusted to 0.3, 0.2, 0.5.

[0040] Existing maintenance is usually based on experience. If the marking has been used for a specified time, or if a single index such as appearance change, the proportion of the falling-off area of glass beads, or the retroreflective brightness coefficient exceeds the specified limit, it is used as the basis for maintenance. However, the existing method is prone to misestimating the best maintenance timing. On the one hand, it may fail to detect the road sections where markings need to be maintained. On the other hand, in order to avoid accidents, frequent maintenance is carried out, resulting in an increase in maintenance costs. At the same time, there are differences in the durability grades (actual states of the markings) of different coatings under different loading times. If a single index is used for judgment, the best maintenance timing will be missed. The marking durability evaluation method of this application can be used as a prediction model. By collecting the appearance quality damage rate a, the proportion of the falling-off area b, and the retroreflective brightness coefficient c of the road marking and substituting them into formula (1), the durability grade of the road marking can be calculated. Users can choose whether to carry out maintenance according to the durability grade. This method can be used to estimate the service life of the marking in different scenarios, comprehensively evaluate the road use performance of the marking, and judge the maintenance timing of the marking.

[0041] Next, three kinds of hot-melt coatings of Guangdong Road Tiger Traffic Co., Ltd. are selected. The hot-melt reflective coating is named hot-melt coating A, with a density of 1.92 g / m 3 , a softening point of 101 °C, a non-sticking tire drying time of < 3 min, a compressive strength of 21.3 MPa, and no premixed glass beads.

[0042] The hot-melt reflective coating is named hot-melt coating B, with a density of 2.12 g / m 3 , a softening point of 114 °C, a non-sticking tire drying time of < 3 min, a compressive strength of 22.4 MPa, and a premixed glass bead content of 20%.

[0043] The raised hot-melt coating is named hot-melt coating C, with a density of 2.07 g / m 3 , a softening point of 110 °C, a non-sticking tire drying time of < 3 min, a compressive strength of 23.4 MPa, and a premixed glass bead content of 25%.

[0044] Example 1

[0045] In this example, hot-melt coating A is used as the coating for the marking, and the specific detection method is as follows:

[0046] S101: Prepare hot-melt coating A and heat and stir it at 200 °C for 30 min to obtain a molten and flowing hot-melt coating.

[0047] S102: Use an asphalt rutting plate with dimensions of 300 mm × 150 mm × 50 mm as the base. First, fill the asphalt gaps in the asphalt rutting plate with a layer of putty film to make the asphalt surface flat. Then, apply hot-melt coating A to the asphalt rutting plate by scraping, controlling the marking thickness to be 1.8 - 2.5 mm. Next, evenly sprinkle glass beads on the surface. The particle size of the glass beads is 16 - 40 mesh, and the spreading amount is 350 - 450 g / m 2 , the refractive index of the glass beads is ≥ 1.7, and the roundness rate is 90%. Control the marking thickness according to the standard requirements. Prepare at least 3 specimens to ensure that the sizes of the specimens and the marking thicknesses of the coatings are basically the same, and the edges of the specimens are flat. After the specimens are cured in an environment with a temperature of 23°C ± 2°C and a humidity of 50% ± 10% for at least 24 hours, conduct the test.

[0048] S103: Select 3 specimens, mark them as No. 1, No. 2, and No. 3 respectively. Adjust the placement order and placement of the 3 specimens so that they can be placed flat in the horizontal groove of the accelerated loading test device, and then reinforce the 3 specimens with a screwdriver. Record the initial appearance state of each specimen, and then select 3 test points for each specimen. Use a domestic retroreflective marking measuring instrument (STT - 301C) to measure and record the initial retroreflective brightness coefficient of each test point.

[0049] S104: Adjust the parameters of the accelerated loading system. The rolling frequency is 7,200 times per hour, the tire pressure is 750 kPa, the width of the test wheel is 80 mm, and the speed of the test wheel is 30 km / h. During the loading process, keep the above parameters unchanged, and the cumulative loading times are 10,000 times, 20,000 times, 30,000 times, 40,000 times, 50,000 times, 100,000 times, and 150,000 times respectively. Among them, during the process of the cumulative loading times reaching 20,000 times, conduct continuous spraying water treatment on the external environment; during the process of the cumulative loading times reaching 40,000 times, conduct continuous hot air treatment on the external environment; during the process of the cumulative loading times reaching 100,000 times, conduct continuous ultraviolet lamp irradiation treatment on the external environment. After each loading is completed, observe the appearance change of the marking and the proportion of the glass bead shedding area; collect the shed glass beads and weigh them; then use the retroreflective marking measuring instrument to measure the value of the retroreflective brightness coefficient, and compare and analyze its change law.

[0050] S105: After accelerating the loading 50,000 times, 100,000 times, and 150,000 times, check whether the marking is damaged or cracked, whether there is a significant change in the appearance color, and the proportion of the glass bead shedding area to detect the durability of the appearance performance of the marking; use the change of the retroreflective brightness coefficient value to detect the durability of the reflective performance of the marking; the weight values of k1, k2, and k3 are 0.3, 0.2, and 0.5 respectively; comprehensively consider the above indicators to comprehensively detect the durability grade of the road - using performance of the hot - melt marking.

[0051] Table 1 Performance test and indicators of hot - melt coating A marking before and after accelerated loading

[0052]

[0053] The test results of the hot-melt coating A are shown in Table 1, and the test results are as follows:

[0054] Number of loading times (in ten thousands of times) S score G score R score P score Durability level 5 98.87 91.88 69.44 82.76 Good 10 95.78 84.00 58.44 74.75 Medium 15 93.21 75.00 12.5 49.21 Poor

[0055] Example 2

[0056] Use the hot-melt coating B to make the road markings and operate according to steps S101 - S105.

[0057] Table 2 Performance test and indicators of the road markings made of hot-melt coating B before and after accelerated loading

[0058]

[0059]

[0060] The test results of the hot-melt coating B are shown in Table 2, and the test results are as follows:

[0061] Number of loading times (in ten thousands of times) S score G score R score P score Durability level 5 98.47 93.24 66.10 81.24 Good 10 96.96 87.75 50.10 71.69 Medium 15 94.16 79.75 35.54 61.97 Poorer

[0062] Example 3

[0063] Take the road markings made of the hot-melt coating C as the test object and operate according to steps S101 - S105.

[0064] Table 3 Performance test and indicators of the road markings made of hot-melt coating C before and after accelerated loading

[0065]

[0066] The test results of the hot-melt coating C are shown in Table 3, and the test results are as follows:

[0067] Number of loading times (in ten thousands of times) S score G score R score P score Durability level 5 99.05 90.08 76.03 85.75 Good 10 97.61 85.56 63.12 77.96 Medium 15 96.07 78.84 51.53 70.35 Medium

[0068] Select two kinds of PMMA two-component coatings from Anhui Tuoli Engineering Materials Technology Co., Ltd. Among them, the spray type is named two-component coating D, and the scrape type is named two-component coating E, and they are respectively used as the coatings for the road markings and tested separately.

[0069] Example 4

[0070] Select the two-component coating D as the road marking coating. The two-component coating D is composed of component D1 and component D2. The specific test method is as follows:

[0071] S201: Prepare two-component coatings. At room temperature, add 4% curing agent to two-component D2 and stir for 3 - 5 min until it reaches a homogeneous state. Meanwhile, stir two-component D1 for 1 - 2 min until it becomes homogeneous. Then, sample two-component D1 and two-component D2 with added curing agent in a ratio of 1:1, mix them, and mechanically stir for 1 - 2 min. Obtain the two-component coatings for standby.

[0072] S202: Use a 300mm×150mm×50mm asphalt rutting plate as the base. First, fill the asphalt gaps in the asphalt rutting plate with a layer of putty film to make the asphalt surface flat. Then, apply the two-component coatings obtained in step one onto the asphalt rutting plate by scraping, controlling the marking thickness to be 1.5 - 2 mm. Then, evenly sprinkle glass beads on the surface. The particle size of the glass beads is 16 - 40 mesh, and the spreading amount is 350 - 450 g / m 2 , the refractive index of the glass beads > 1.7, the roundness rate is 90%, and control the marking thickness according to the standard requirements. Prepare at least 3 specimens, ensure the size of the specimens, and the marking thickness of the coated specimens is basically the same, with the edges of the specimens being flat. After the specimens are cured in an environment with a temperature of 23 ± 2°C and a humidity of 50% ± 10% for at least 24 h, conduct the test.

[0073] S203: Select 3 specimens, place them flat in the horizontal groove of the accelerated loading test device and fix them. Record the initial appearance state of each specimen, and use a domestic retroreflective marking measuring instrument (STT - 301C) to measure and record the initial retroreflective brightness coefficient of each test point.

[0074] S204: Adjust the parameters of the accelerated loading system. The rolling frequency is 7200 times / hour, the tire pressure is 750 kPa, the width of the test wheel is 80 mm, and the speed of the test wheel is 30 km / h. Keep the above parameters unchanged, and the cumulative loading times are 10,000 times, 20,000 times, 30,000 times, 40,000 times, 50,000 times, 100,000 times, and 150,000 times respectively. Among them, during the loading process, continuously spray water treatment on the external environment, continuously conduct hot air treatment on the external environment, and continuously irradiate the external environment with ultraviolet lamps. After each loading is completed, observe the appearance change of the marking and the proportion of the glass bead shedding area; collect the shed glass beads and weigh them; then use the retroreflective marking measuring instrument to measure the value of the retroreflective brightness coefficient and analyze its change law by comparison.

[0075] S205: Detect the durability of the marking reflective performance based on the change of the retroreflective brightness coefficient value; the weight values of k1, k2, and k3 are 0.3, 0.2, and 0.5 respectively; comprehensively consider the above indicators to comprehensively detect the durability grade of the road performance of the hot melt marking.

[0076] Table 4 Performance Test and Index of Two-Component Coating D Marking Before and After Accelerated Loading

[0077]

[0078]

[0079] The test results of the two-component coating D are shown in Table 4, and the test results are as follows:

[0080] Number of loading times (in ten thousands of times) S score G score R score P score Durability level 5 99.73 98.04 86.63 92.84 Excellent 10 97.51 96.58 84.24 90.69 Excellent 15 96.47 92.16 76.29 85.52 Good

[0081] Example 5

[0082] Select the two-component coating E as the marking coating. The two-component coating E is composed of component E1 and component E2, and the detection operations are carried out by using steps S201 - S205. The specific results are as follows:

[0083] Table 5 Performance test and indicators of the two-component coating E marking before and after accelerated loading

[0084]

[0085] The test results of the two-component coating E are shown in Table 5, and the test results are as follows:

[0086] Number of loading times (in ten thousands of times) S score G score R score P score Durability level 5 99.92 98.44 90.04 94.68 Excellent 10 99.73 97.11 81.54 90.11 Excellent 15 98.81 94.48 70.18 83.63 Good

[0087] Based on the results of the specific Examples 1 - 5, the durability of various coatings is shown in Table 6:

[0088] Table 6 Detection results of the coating durability grade

[0089]

[0090] To sum up, the detection method of the present application can analyze and propose the comprehensive durability score P of the marking according to the changes in the appearance and retroreflective performance of the road marking under the action of the traffic load. According to P, the durability grade can be obtained, and this durability grade can provide a basis and reference for the selection of the marking maintenance time, and can predict the service life of the marking. When the durability grade is poor, the marking needs to be maintained; at the same time, according to the detection and evaluation method of the present application, the markings with poor durability can be found in time, and at the same time, the road unit can better maintain the old markings, which can effectively reduce unnecessary marking maintenance and reduce the maintenance cost.

[0091] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present invention shall be included within the protection scope of the technical solution of the present invention.

Claims

1. A method for detecting and evaluating the durability of road markings, characterized in that, The specific steps are as follows: S1. Fabricate asphalt rutting plates coated with markings. The number of asphalt rutting plates is greater than or equal to 3. Number the asphalt rutting plates and cure them in an environment with a temperature of 23 ± 2 °C and a humidity of 50 ± 10% for more than 24 h; S2. Place the asphalt rutting plates flat in the horizontal groove of the accelerated loading test device, record their initial appearance state, select at least 3 test points on each asphalt rutting plate, and use a retroreflective marking measuring instrument to measure and record the initial retroreflective brightness coefficient of each test point; S3. Set the parameters of the accelerated loading test device. The rolling frequency is 7200 ± 200 times / hour, the tire pressure is 750 ± 50 kPa, the width of the test wheel is 80 ± 5 mm, and the speed of the test wheel is 30 ± 2 km / h; Conduct loading tests according to the set number of loadings. After each loading test is completed, obtain photos of the marking changes by taking pictures, collect the shed glass beads at the same time, and weigh them to obtain the shed mass m0; finally, use a retroreflective marking measuring instrument to measure the retroreflective brightness coefficient c on the surface of the asphalt rutting plate; S4. Calculate the obtained appearance quality change S, the proportion G of the shed glass bead area, and the retroreflective brightness change R respectively, and calculate the comprehensive durability score P of the markings on the corresponding asphalt rutting plate according to the three detection indicators; The calculation formula for the comprehensive durability score P is: *100 ； Where: k1 is the weight coefficient of the appearance quality change, k2 is the weight coefficient of the proportion of the shed glass bead area, and k3 is the weight coefficient of the retroreflective brightness coefficient; Where: a is the appearance quality damage rate, b is the proportion of the shed area. a and b are obtained by analyzing the marking change photos by the grayscale method; at the same time, in the calculation formula of the score P, the value range of a is: 0 ≤ a ≤ 25%, the value range of b is: 0 ≤ b ≤ 20%, and the value range of c is: c ≥ 150; when the durability grade is poor, the markings need to be maintained; The durability grades are shown in Table 1: 。 2. The method for detecting and evaluating the durability of road markings according to claim 1, characterized in that: The paint used in the marking line is one or more of hot melt paint, two-component paint, water-based paint and solvent-based paint; among them, the coating width of the marking line is 15±0.5 cm, and the spreading amount of the surface-sprinkled glass beads of the marking line is 350-450 g / m 2 ; The asphalt rutting plates to be tested are of the same size, the markings coated on the asphalt rutting plates have the same thickness, and the edges of the asphalt rutting plates are flat.

3. The method for detecting and evaluating the durability of road markings according to claim 1, wherein: In step S3, during the accelerated loading process, perform one or more of continuous water spraying treatment, hot air treatment, and ultraviolet lamp irradiation treatment on the external environment of the asphalt rutting plates; In step S3, the number of loadings is 10,000 times, 20,000 times, 30,000 times, 40,000 times, 50,000 times, 100,000 times, and 150,000 times respectively.

4. The method for detecting and evaluating the durability of road markings according to claim 3, wherein: In step S2, in order to simulate the actual aging environment of the marking paint, when the cumulative number of loadings is 20,000 times, the number of continuous water spraying treatments on the external environment is greater than or equal to 10,000 times; when the cumulative number of loadings is 40,000 times, the number of continuous hot air treatments on the external environment is greater than or equal to 10,000 times; when the cumulative number of loadings is 100,000 times, the irradiation time of continuous ultraviolet lamp irradiation treatment on the external environment is greater than or equal to 21,600 s.

5. The durability detection and evaluation method of road markings according to claim 1, characterized in that: The detection indicators of the appearance quality change include marking breakage and shedding, marking cracking, and significant change in the appearance color of the markings.

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