A durability evaluation method for porous asphalt pavement under the coupling action of four fields

Abstract

The present invention provides a durability evaluation method for porous asphalt pavement under the action of four-field coupling, including: fabricating six asphalt mixture specimens by the wheel rolling method, dividing them into two groups, and reserving the specimens after curing and demolding. Weigh the dry weight T1 and volume index V1 of the first group of specimens, and the dry weight T2 and volume index V2 of the second group of specimens; add fine aggregate to 2.5 L of pure water and stir evenly to obtain a plugging solution; lock the first group of demolded specimens back with a large rut specimen template, then pour the plugging solution onto the specimens to obtain rut specimens in a plugged state, then put them into an oven and dry for 48 hours until constant weight, and finally demold and cool them and weigh to obtain the dry weight T2; put the first group of rut specimens in a plugged state into a soaking rut tester for soaking rut test to obtain the soaking dynamic stability D1; put the second group of asphalt mixture specimens into a rut tester for air curing and heat preservation and then conduct the test to obtain the dynamic stability D2; calculate the void decay rate and dynamic stability decay rate according to the obtained parameters, and use the calculation result as an index to judge the anti-humid and heat performance of the porous asphalt pavement in a plugged state, and evaluate the durability of the porous asphalt pavement in humid and hot areas during long-term operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of durability evaluation of asphalt pavements, and particularly relates to a method for evaluating the durability of porous asphalt pavements under the coupling action of four fields. Background Art

[0002] In recent years, due to the rapid development of China's economy, each province in the country has made great progress in the construction field of expressways, and the national expressway network has been basically completed. At the same time, with the popularization of the concept of sponge ecological cities, traditional dense-graded asphalt pavements can no longer meet the needs of urban development. Porous asphalt pavements have won more and more favor from road workers due to their outstanding performance in water permeability, noise reduction, anti-skid and durability, and have been vigorously promoted in high-grade pavements and municipal roads in China.

[0003] A porous asphalt pavement is a pavement constructed with porous asphalt mixture as the surface layer, and its porosity is generally greater than 18%. The surface water of this kind of pavement can enter the pavement and be discharged laterally, thus eliminating surface water accumulation and effectively reducing the traffic accident rate caused by wet and slippery roads in rainy days. The porous asphalt pavement mainly has the following advantageous characteristics: (1) Greatly improve the driving safety and comfort in rainy days. There is no water accumulation on the porous asphalt pavement in rainy days, which can ensure good adhesion between the tire and the pavement, greatly improve the anti-skid performance of the pavement, and prevent the occurrence of hydroplaning accidents; at the same time, it can reduce the splash water and water mist behind the vehicle, improve the driving conditions, and improve the visibility of driving in rainy days; the texture depth and anti-skid performance of the pavement are significantly improved, and the road safety accidents are greatly reduced. (2) Reduce the rolling noise generated by vehicle driving. Highway traffic noise is mainly generated by the vehicle itself and the interaction between the tire and the pavement when the vehicle is driving. According to relevant data, when the vehicle speed is greater than 50 km / h, the main noise source is the noise between the tire and the pavement. The porous asphalt pavement has a large porosity and is a multi-porous structure. This kind of structure reduces the pumping effect between the tire and the pavement, reduces the noise by 3-8 decibels, and improves the living environment along the road. (3) Improve the visual performance of the pavement and prevent glare. Because the surface of the porous asphalt pavement is rough and easy to form diffuse reflection, it can prevent the sun from dazzling in the daytime and slow down the glare of oncoming vehicle lights at night, thus greatly reducing the incidence of road traffic accidents and having good social and economic benefits.

[0004] Due to the large void characteristics of porous asphalt pavement, there are many connected voids on the surface and inside of its asphalt mixture, making it more vulnerable to adverse factors such as sunlight, rain, and dust. Especially during operation, as debris such as dust and soil enters the voids of the porous asphalt pavement, the void ratio and permeability of the porous asphalt pavement decrease. During rainy-season driving, hydrodynamic pressure is formed, exacerbating the occurrence of diseases such as flaking and potholes on the porous asphalt pavement. Currently, relevant industry specifications for the mixture design of porous asphalt pavement have been published in China. However, in the mixture design, the durability problem of long-term operation of porous asphalt pavement has not been considered. The long-term durability problem is exactly the problem that needs to be solved for the large-scale popularization and use of porous asphalt pavement. In the actual operation process in humid and hot regions, the most vulnerable stage for diseases to occur on porous asphalt pavement is after rain in blocked sections, where hydrodynamic pressure is formed by the driving load, continuously eroding the structure of the porous asphalt pavement. Therefore, the present invention proposes a durability evaluation method for porous asphalt pavement in humid and hot regions under the coupling action of "water-temperature-load-void blockage", which can complement the current mixture design specifications, propose new methods and indicators for the durability design of the mixture of porous asphalt pavement, and can more effectively ensure the durability of porous asphalt pavement. Summary of the Invention

[0005] The purpose of the present invention is to provide a durability evaluation method for porous asphalt pavement under the coupling action of four fields, aiming to evaluate the long-term operation durability of porous asphalt pavement by calculating the void attenuation rate and dynamic stability attenuation rate under the coupling action of "water-temperature-load-void blockage".

[0006] To achieve the above technical purposes and reach the above technical effects, the present invention is realized through the following technical solutions:

[0007] The present invention provides a durability evaluation method for porous asphalt pavement under the coupling action of four fields, including the following steps:

[0008] Step 1: Use the wheel rolling method to fabricate six asphalt mixture specimens, divide them into two groups, with three specimens in each group. After the cured and formed asphalt mixture specimens are demolded, they are reserved for use. At the same time, weigh the dry weight T1 and volume index V1 of the first group of asphalt mixture specimens, and the dry weight T2 and volume index V2 of the second group of asphalt mixture specimens.

[0009] Step 2: Add a fixed gradation amount of fine aggregate to 2.5 L of pure water and stir evenly to obtain a prepared blockage solution.

[0010] Step 3: Reinstall the first group of asphalt mixture specimens after demolding using the large rutting plate specimen template, and then slowly and evenly pour the prepared plugging solution onto the asphalt mixture specimens. During this process, continuously stir with a glass rod in the beaker to make the plugging solution disperse evenly and prevent the plugging solution from splashing. Repeat the plugging test several times to obtain the rutting specimens in the plugged state, then put them into the oven and dry for 48 hours until constant weight. Finally, demold and let them cool, and weigh to obtain the dry weight T2;

[0011] Step 4: Put the first group of rutting specimens in the plugged state into the immersion rutting instrument, carry out the immersion rutting test after soaking and heat preservation, and the immersion dynamic stability D1 can be obtained after the test;

[0012] Step 5: Put the second group of asphalt mixture specimens into the rutting instrument, carry out the test after air curing and heat preservation, and the dynamic stability D2 can be obtained after the test;

[0013] Step 6: According to the obtained parameters, calculate the void decay rate according to the following formula:

[0014] V dr =(VV1 - VV2) / VV1 * 100%=(V1 * T2 - V2 * T1) / (V1 * V2 * r t - V2 * T1) * 100%;

[0015] In the formula: V dr is the void decay rate, VV1 is the initial void ratio of the rutting specimen, VV2 is the void ratio of the rutting specimen after the test, V1 is the volume of the first group of asphalt mixture specimens, V2 is the volume of the second group of asphalt mixture specimens, and r t is the maximum theoretical density of the rutting specimen;

[0016] Step 7: According to the obtained parameters, calculate the dynamic stability decay rate according to the following formula:

[0017] D dr =(D2 - D1) / D2 * 100%;

[0018] In the formula: D dr is the dynamic stability decay rate, D1 is the 50°C immersion dynamic stability in the plugged state, and D2 is the 60°C dynamic stability in the air bath;

[0019] Step 8: Conduct durability evaluation according to the void decay rate V dr and the dynamic stability decay rate D dr When the void decay rate V dr of the porous asphalt mixture is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [0 - 35%], the durability is excellent; when the void decay rate V drIn the range of [0 - 20%], the dynamic stability attenuation rate D dr When it is in the range of [35% - 50%], the durability is good; when the void attenuation rate V of the porous asphalt mixture dr In the range of [0 - 20%], the dynamic stability attenuation rate D dr When it is in the range of [50% - 100%], the durability is poor; or when the void attenuation rate V of the porous asphalt mixture dr > 20%, the dynamic stability attenuation rate D dr When it is in the range of [0% - 50%], the durability is good; when the void attenuation rate V of the porous asphalt mixture dr > 20%, the dynamic stability attenuation rate D dr When it is in the range of [50% - 100%], the durability is poor.

[0020] As a further improvement of the present invention, the void ratios of the asphalt mixture specimens in step 1 are consistent, the repeatability error is 15% of the average value, and the size of each specimen is 300 mm × 300 mm × 50 mm.

[0021] As a further improvement of the present invention, the gradation and quality of the fine aggregate in step 2 are as shown in the following table:

[0022]

[0023] As a further improvement of the present invention, in step 3, in order to pour the blocking solution completely into the rut specimen, a total of 500 ml of pure water is used in multiple times to wash all the dust fine aggregate adhering to the cup wall into the rut specimen, so that the total water consumption is 3 L; the height of the blocking solution from the surface of the rut specimen is 10 - 15 cm; the number of blocking tests is 3 times.

[0024] As a further improvement of the present invention, the template material of the large rut plate specimen in step 3 is steel plate or copper plate, and its inner size is 300 mm × 300 mm × 100 mm; during the mold loading process, the bottom of the rut specimen plate is aligned with the bottom of the large rut plate specimen template, so that the inner side of the large rut plate specimen template is 50 mm higher than the top of the rut specimen plate; the drying temperature of the rut specimen of the modified asphalt mixture is 105°C ± 5°C; the drying temperature of the rut specimen of the matrix asphalt mixture is 80°C ± 5°C; the cooling time after drying is 48 h.

[0025] As a further improvement of the present invention, the temperature of the immersion heat preservation in step 4 is 50°C, and the time of the immersion heat preservation is not less than 5 hours and not more than 12 hours.

[0026] As a further improvement of the present invention, the temperature of the heat preservation in step 5 is 60°C, and the heat preservation time is not less than 5 hours and not more than 12 hours.

[0027] Advantages of the present invention:

[0028] The evaluation method adopted by the present invention fully considers the most unfavorable operating environment of the porous asphalt pavement under the coupled environmental conditions of "water-temperature-load-void blockage". The physical and mechanical theories of the evaluation results are clear, and the indicators are closely related to the actual situation of the porous asphalt pavement. It can accurately evaluate the long-term operating durability of the porous asphalt pavement in humid and hot regions, provide new methods and parameters for the durability evaluation of the porous asphalt pavement in China, and enrich the durability evaluation means of the drainage and noise reduction asphalt mixture. Description of the drawings

[0029] Figure 1 It is a step flow block diagram of the durability evaluation method described in the present invention. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The present invention provides a durability evaluation method for a porous asphalt pavement under the action of four-field coupling, including the following steps:

[0032] Step 1: Use the wheel rolling method to form six PAC-13 asphalt mixture specimens, divide them into two groups, with three specimens in each group. After the cured and formed asphalt mixture specimens are demolded, they are reserved for use. At the same time, weigh the dry weight T1 and volume index V1 of the first group of asphalt mixture specimens, and the dry weight T2 and volume index V2 of the second group of asphalt mixture specimens;

[0033] Two types of modified asphalt were used to prepare PAC-13 asphalt mixtures. One was Shell SBS modified asphalt, and the other was high-performance rubber modified asphalt (Rubber Modified Asphalt, RMA) produced by Guangxi Transportation Science & Technology Group Co., Ltd. The high-viscosity modifier was produced by Zhonglu High-Tech Transportation Technology Group Co., Ltd. The target void ratio for mix design was 21% for both. First, batching was carried out according to the density of Marshall standard compaction specimens at 100% ± 1%. Then, according to the "Method for Making Asphalt Mixture Specimens (Wheel Rolling Method)" (T0703-2011) in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), 2 groups of 12 specimens (each specimen size: 300mm × 300mm × 50mm) of porous asphalt mixture rut specimens were made. When forming specimens by the wheel rolling method, the cushion paper in the test mold was made of release paper to prevent the cushion paper from adhering to the bottom and side of the rut specimen and affecting the clogging test. After the formed rut specimens were placed at room temperature for curing for 48h, the mold was removed and weighed, and the volume index was measured. They were divided into four groups for standby. The results are shown in Table 1 below. According to the calculation method, the maximum theoretical density was 2.717g / cm 3 , and the repeatability error of the void ratio for each group satisfied within 15% of the average value.

[0034] Table 1 Basic indicators of four groups of asphalt mixtures

[0035]

[0036]

[0037] Step 2: Add a certain gradation amount of fine aggregate to 2.5L of pure water and stir well to obtain the prepared clogging solution; according to the fine aggregate gradation composition in Table 2, weigh 260g of the ingredients, and then add them to 2.5L of pure water and stir well to make the clogging solution.

[0038] Table 2 Fine aggregate gradation composition

[0039]

[0040] Step 3: Lock the first group of demolded specimens back using the large rut plate specimen template, and then slowly and evenly pour the prepared clogging solution onto the asphalt mixture specimen according to the principle of first the edge and then the center. During this process, continuously stir with a glass rod in the beaker to make the clogging solution disperse evenly and at the same time prevent the clogging solution from splashing out; repeat the clogging test several times to obtain the rut specimen in the clogged state, then put it into the oven and dry it for 48 hours until it reaches a constant weight. Finally, after demolding and cooling, weigh it to obtain T2;

[0041] Three asphalt mixture specimens of SBS modified asphalt PAC-13 and rubber modified asphalt PAC-13 after the first group were demolded were locked back using the large rutting plate specimen template, and then the outside of the specimen template was raised with bricks so that the lower part of the rutting plate was suspended, allowing the prepared plugging solution to pass through freely. The bricks should not block the lower side of the rutting plate. Each specimen was equipped with 3 cups of plugging solution. Subsequently, the prepared plugging solution was slowly and evenly poured onto the specimen at a position 10 cm from the surface of the rutting specimen according to the principle of first the edge and then the center. During this period, continuously stir with a glass rod in the beaker to make the plugging solution disperse evenly and prevent the plugging solution from splashing out. To pour all the plugging solution into the rutting plate, 500 ml of pure water with a cumulative total amount can be used in multiple times to wash all the dust and fine aggregates sticking to the cup wall into the rutting plate, making the total water consumption 3 L. Each specimen was subjected to 3 plugging tests to obtain the rutting specimen in the plugged state, and then placed in an oven and dried at 105 °C for 48 hours until constant weight. Finally, after demolding and cooling for 48 h respectively, the weight was measured to obtain T2, and the results are shown in Table 3 below.

[0042] Table 3 Basic indexes of asphalt mixture after plugging test

[0043] Serial number (plugging test specimen) Dry weight / g <![CDATA[Volume / cm 3 > SBS group 1-1 10086.9 4545 SBS group 1-2 10001.3 4518 SBS group 1-3 10025.7 4527 CR group 1-1 9976.8 4536 CR group 1-2 10050.2 4554 CR group 1-3 10025.7 4554

[0044] Step 4: Put the first group of plugged specimens into the immersion rutting instrument, carry out the immersion rutting test after immersion and heat preservation, and the immersion dynamic stability D1 can be obtained after the test is completed.

[0045] Three plugged specimens of the first group of SBS modified asphalt PAC-13 and rubber modified asphalt PAC-13 were respectively put into the immersion rutting instrument for immersion and heat preservation at a temperature of 50 °C and an immersion heat preservation time of 6 hours. After the heat preservation time was up, the three specimens of the two kinds of PAC-13 were successively subjected to the immersion rutting test, and the dynamic stabilities D1 of the three specimens of the two kinds of PAC-13 were respectively obtained. Among them, the SBS modified asphalt PAC-13 was 9875 times / mm, 9777 times / mm and 9437 times / mm respectively; the rubber modified asphalt PAC-13 was 8874 times / mm, 8447 times / mm and 9217 times / mm respectively.

[0046] Step 5: Put the second group of cured and formed specimens into the rutting instrument for air curing and heat preservation and then conduct the test, and the dynamic stability D2 can be obtained after the test is completed.

[0047] Three specimens of SBS modified asphalt PAC-13 and three specimens of rubber modified asphalt PAC-13 in the second group were respectively placed in a rutting tester for air insulation at a temperature of 60°C for 6 hours. After the insulation time was up, the rutting tests were carried out on the three specimens of the two kinds of PAC-13 in turn, and the dynamic stability D2 of the three specimens of the two kinds of PAC-13 was obtained respectively. Among them, the SBS modified asphalt PAC-13 was 5925 times / mm, 5337 times / mm and 5105 times / mm respectively; the rubber modified asphalt PAC-13 was 5876 times / mm, 5797 times / mm and 6112 times / mm respectively.

[0048] Step 6: According to the obtained parameters, calculate the void attenuation rate according to formula (1):

[0049] V dr =(VV1 - VV2) / VV1*100%=(V1*T2 - V2*T1) / (V1*V2*r t - V2*T1)*100%; (1)

[0050] In the formula: V dr is the void attenuation rate, VV1 is the initial void ratio of the rut specimen, VV2 is the void ratio of the rut specimen after the test, V1 is the volume of the first group of asphalt mixture specimens, V2 is the volume of the second group of asphalt mixture specimens, r t is the maximum theoretical density of the rut specimen, which can be obtained by the calculation method of specification T0705;

[0051] Step 7: According to the obtained parameters, calculate the dynamic stability attenuation rate according to formula (2):

[0052] D dr =(D2 - D1) / D2*100%; (2)

[0053] In the formula: D dr is the dynamic stability attenuation rate, D1 is the dynamic stability of immersion at 50°C in the blocked state, and D2 is the dynamic stability at 60°C in the air bath;

[0054] The larger the dynamic stability attenuation rate, the worse the anti-humid heat performance of the porous asphalt pavement in the blocked state, which to a certain extent represents the long-term durability of the PAC-13 porous asphalt pavement.

[0055] According to the calculation method, the maximum theoretical density is 2.717 g / cm 3 , and at the same time, the calculations are carried out according to the void attenuation rate formula (1) and the dynamic stability attenuation rate formula (2). The calculation results are shown in Table 4 and Table 5 below. Among them, in order to ensure the error of the test, the allowable error of the repeatable void attenuation rate is 20% of the average value, otherwise the test shall be carried out again; with V dr and D drThe calculation results are used as indicators to evaluate the anti-humid heat performance of porous asphalt pavement under blocked conditions, and to evaluate the durability of long-term operation of porous asphalt pavement in humid and hot regions.

[0056] Table 4 Test results of void decay rate

[0057]

[0058] Table 5 Test results of dynamic stability decay rate

[0059]

[0060] Step 8: According to the void decay rate V dr and the dynamic stability decay rate D dr conduct durability evaluation. When the void decay rate V dr of the porous asphalt mixture is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [0 - 35%], the durability is excellent; when the void decay rate V dr of the porous asphalt mixture is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [35% - 50%], the durability is good; when the void decay rate V dr of the porous asphalt mixture is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [50% - 100%], the durability is poor; or when the void decay rate V dr > 20% of the porous asphalt mixture, and the dynamic stability decay rate D dr is in the range of [0% - 50%], the durability is good; when the void decay rate V dr > 20% of the porous asphalt mixture, and the dynamic stability decay rate D dr is in the range of [50% - 100%], the durability is poor.

[0061] According to the results in Table 4, the repeatability allowable error of the void ratio after the clogging test of the two kinds of modified asphalt mixtures both meets 20% of the average value, so the above tests are valid. From Table 5, it can be seen that the dynamic stability of the PAC-13 asphalt mixture prepared with SBS modified asphalt under the conventional rutting test conditions > the dynamic stability of the PAC-13 asphalt mixture prepared with rubber modified asphalt, indicating that under normal conditions, the PAC-13 asphalt mixture prepared with SBS modified asphalt has stronger high-temperature resistance. However, in humid and hot regions, after the porous asphalt pavement has been in operation for a period of time, the voids on the surface of PAC-13 begin to show signs of clogging. Especially during heavy rain in summer at high temperatures, the porous asphalt pavement is in the most unfavorable service stage and is extremely prone to damage. And this test can better simulate this situation and better reflect the durability of the porous asphalt pavement. From Table 5, it can be seen that the dynamic stability attenuation rate of SBS-PAC-13 is 43.8% > the dynamic stability attenuation rate of RMA-PAC-13 is 33.0%. This shows that the PAC-13 asphalt mixture prepared with SBS modified asphalt has stronger initial high-temperature resistance, but its durability in the actual service process is worse than that of the PAC-13 asphalt mixture prepared with rubber modified asphalt. The durability evaluation of the PAC-13 asphalt mixture prepared with SBS modified asphalt is excellent; the durability evaluation of the PAC-13 asphalt mixture prepared with rubber modified asphalt is good.

Claims

1. A durability evaluation method for porous asphalt pavement under the coupling action of four fields, characterized in that, It includes the following steps: Step 1: Use the wheel rolling method to make six asphalt mixture specimens, divide them into two groups, with three specimens in each group. After the cured and formed asphalt mixture specimens are demolded, they are reserved for use. At the same time, weigh the dry weight T1 and volume index V1 of the asphalt mixture specimens in the first group, and the dry weight T2 and volume index V2 of the asphalt mixture specimens in the second group; Step 2: Add a fixed amount of fine aggregate to 2.5 L of pure water and stir well to obtain the prepared plugging solution; Step 3: Lock the first group of demolded asphalt mixture specimens back with a large rut specimen template, and then slowly and evenly pour the prepared plugging solution onto the asphalt mixture specimens. During this process, stir to make the plugging solution disperse evenly and prevent the plugging solution from splashing. Repeat the plugging test several times to obtain the rut specimens in the plugged state, then put them into the oven and dry for 48 hours until constant weight. Finally, demold and cool them, and then weigh to obtain the dry weight T'; Step 4: Put the rut specimens of the first group in the plugged state into the immersion rut instrument, carry out the immersion rut test after soaking and heat preservation, and obtain the immersion dynamic stability D1 after the test; Step 5: Put the asphalt mixture specimens of the second group into the rut instrument, carry out the test after air curing and heat preservation, and obtain the dynamic stability D2 after the test; Step 6: According to the obtained parameters, calculate the void decay rate according to the following formula: V dr =(VV1 - VV2) / VV1 * 100% = (T' - T1) / (V1 * r t - T1) * 100%; Where: V dr is the void attenuation rate, VV1 is the void ratio of the initial rut specimen, VV2 is the void ratio of the rut specimen after the test, V1 is the volume of the first group of asphalt mixture specimens, T' is the dry weight of the first group of asphalt mixture specimens after the plugging test, r t is the maximum theoretical density of the rut specimen; Step 7: According to the obtained parameters, calculate the dynamic stability decay rate according to the following formula: D dr =(D2 - D1) / D2 * 100%; Where: D dr is the attenuation rate of dynamic stability, D1 is the dynamic stability after 50°C immersion in the blocked state, and D2 is the dynamic stability at 60°C in the air bath; Step 8: Conduct durability evaluation based on the void decay rate V dr and the dynamic stability decay rate D dr When the void decay rate V of the porous asphalt mixture dr is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [0 - 35%], the durability is excellent; when the void decay rate V of the porous asphalt mixture dr is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [35% - 50%], the durability is good; when the void decay rate V of the porous asphalt mixture dr is in the range of [0 - 20%], and the dynamic stability decay rate D dr is in the range of [50% - 100%], the durability is poor; or when the void decay rate V of the porous asphalt mixture dr > 20%, and the dynamic stability decay rate D dr is in the range of [0% - 50%], the durability is good; when the void decay rate V of the porous asphalt mixture dr > 20%, and the dynamic stability decay rate D dr is in the range of [50% - 100%], the durability is poor.

2. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, characterized in that: The void ratios of the asphalt mixture specimens described in Step 1 are the same, and the repeatability error is 15% of the average value. The size of each specimen is 300 mm × 300 mm × 50 mm.

3. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, wherein, The total mass of the fine aggregate described in Step 2 is 260 g, of which the mass of the fine aggregate with a particle size of 0.075 mm - 0.3 mm is 91.52 g, the mass of the fine aggregate with a particle size of 0.3 mm - 0.6 mm is 64.48 g, the mass of the fine aggregate with a particle size of 0.6 mm - 1.18 mm is 39.52 g, the mass of the fine aggregate with a particle size of 1.18 mm - 2.36 mm is 37.18 g, and the mass of the fine aggregate with a particle size of 2.36 mm - 4.75 mm is 27.3 g.

4. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, wherein: In Step 3, to completely pour the plugging solution into the rut specimens, use a total of 500 ml of pure water in multiple times to wash all the dust and fine aggregate sticking to the cup wall into the rut specimens, so that the total water consumption is 3 L; the height of the plugging solution from the surface of the rut specimens is 10 - 15 cm; the number of plugging tests is 3 times.

5. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, characterized in that: The material of the large rut specimen template described in Step 3 is steel plate or copper plate, and its inner size is 300 mm × 300 mm × 100 mm; during the mold installation process, align the bottom of the rut specimen plate with the bottom of the large rut specimen template, so that the inner side of the large rut specimen template is 50 mm higher than the top of the rut specimen plate; the drying temperature of the rut specimens of the modified asphalt mixture is 105°C ± 5°C; the drying temperature of the rut specimens of the matrix asphalt mixture is 80°C ± 5°C; the cooling time after drying is 48 h.

6. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, wherein: The temperature of the soaking and heat preservation described in Step 4 is 50°C, and the soaking and heat preservation time is not less than 5 hours and not more than 12 hours.

7. The durability evaluation method of the porous asphalt pavement under the action of four-field coupling according to claim 1, characterized in that: The temperature for heat preservation described in Step 5 is 60°C, and the heat preservation time is not less than 5 hours and not more than 12 hours.

Images