Method for confirming proportion of surface modification solution for improving water damage resistance of acidic aggregate asphalt mixture

Abstract

The invention relates to the field of asphalt mixture materials, provides a method for confirming the proportion of a surface modification solution for improving the water damage resistance of an acid aggregate asphalt mixture, and solves the defects of performance excess and material waste caused by lack of a systematic and accurate solution proportion confirmation method in the existing acid aggregate surface modification method. The method comprises the steps that a silane coupling agent KH550, deionized water and absolute ethyl alcohol are mixed according to different mass ratios, and surface modification solutions with different ratios are prepared through magnetic stirring, standing and other links; the acid aggregate is soaked in surface modification solutions with different proportions, and surface modification of the acid aggregate is achieved after high-temperature dehydration and curing; determining and observing the hydrolysis condition of the modified solution by using Fourier transform infrared spectroscopy; a scanning electron microscope and an energy spectrum instrument are used for respectively observing the state and surface element composition of a silane film after the surface of the aggregate is modified, and the adhesion work and stripping work of the aggregate are measured and calculated by means of a contact angle instrument, so that the surface modification effect is determined.

Description

Technical Field

[0001] The present application relates to the field of asphalt mixture materials, and more particularly to a method for confirming a solution ratio, and more particularly to a method for confirming a surface modified solution ratio for improving water damage resistance of an acidic aggregate asphalt mixture. Background Art

[0002] In road engineering, common aggregates include basalt, granite, limestone and diabase. Different aggregates have different properties and different adhesion properties with asphalt. One of the main reasons is that the pH value of different aggregate surfaces is different. It is generally believed that asphalt is acidic. Under the same conditions, the adhesion between alkaline aggregates and asphalt is better than that between acidic aggregates, because the surface active sites of alkaline aggregates will react chemically with the acidic substances in asphalt to form stable chemical bonds and improve the adhesion strength. Therefore, the aggregates used in asphalt pavements are often alkaline or neutral high-quality aggregates, but the reserves of these aggregates are limited and cannot meet the needs of long-term use. In order to use high-quality stone sources, many engineering projects do not hesitate to purchase alkaline or neutral high-quality aggregates across provinces, resulting in extremely high engineering costs. However, my country has abundant reserves of acidic stones, which can be easily obtained locally and have low use costs. In highway construction, if acidic aggregates with excellent mechanical properties are reasonably used, the dependence on other high-quality aggregates can be reduced, effectively reducing construction costs.

[0003] Studies have shown that the problem of insufficient adhesion between the aggregate and asphalt needs to be solved in the engineering application of acidic aggregates, especially under the action of water, which can easily lead to damage and deterioration of the asphalt pavement, thus causing various diseases. At present, there are two common treatments for the application of acidic aggregates. One is to add anti-stripping agents to asphalt or asphalt mixtures to improve the anti-stripping performance of asphalt mixtures. Another acidic aggregate treatment method is to modify the surface of the aggregate to improve the interfacial adhesion and interfacial water damage resistance between the aggregate and asphalt. Compared with other treatment methods, silane coupling agents can directly modify aggregates, play a chemical bond bridge role between the interface of asphalt and aggregates, and have the advantages of good thermal stability and uniform modification.

[0004] A large number of experimental studies have shown that the adhesion between asphalt and aggregate interface is selective, and the water sensitivity of mixtures composed of the same aggregate and different asphalt compositions varies greatly, so aggregate treatment must be designed specifically. Therefore, although the treatment technology of surface modified acidic aggregates with silane coupling agents has made a lot of progress, there is a lack of systematic solution configuration methods, which often only focuses on improving the modification effect while ignoring the balance between performance and cost.

[0005] Chinese patent publication number CN108975760B discloses an enhancer for modifying acid aggregate asphalt mixture and its application, wherein the enhancer is made of modifier A and modifier B used in combination; the mass of modifier A is 0.2%-2% of the mass of base asphalt in the acid aggregate asphalt mixture, and the mass of modifier B is 0.4%-1% of the total mass of the acid aggregate asphalt mixture; the modifier A is a silane coupling agent; the modifier B is a natural asphalt solid powder; the particle size of the natural asphalt solid powder of modifier B is 400 mesh-600 mesh; the use of the enhancer adopts the following operating steps: (1) according to the total amount of acid aggregate asphalt mixture to be prepared and the mass of base asphalt used to prepare the acid aggregate asphalt mixture, determine the mass of modifier A and modifier B; prepare base asphalt, acid aggregate, mineral powder, modifier A and modifier B for use; (2) heating the base asphalt to 140-160°C, then adding the modifier A of step (1) to the base asphalt and mixing for 20-60 minutes to obtain modified asphalt; (3) heating and controlling the temperature of the acidic aggregate to 160-200°C, adding the modified asphalt of step (2) to the acidic aggregate, mixing for 90 seconds, and obtaining product 1; (4) adding the modifier B and the mineral powder to the product 1 obtained in step (3), mixing at 150-170°C for 90 seconds, and obtaining an acidic aggregate asphalt mixture that can be paved and formed at 120-150°C. This patent improves the performance of the aggregate asphalt mixture by applying the modifier to the acidic aggregate. When applied to pavement, the mixing temperature and the molding temperature are both reduced, which saves energy consumption and reduces the aging degree of the asphalt. However, this patent still focuses on improving the performance, and does not involve the system solution preparation method, which still ignores the balance between performance and cost. Summary of the invention

[0006] Therefore, in response to the above problems, the present application provides a method for confirming the ratio of surface modification solution for improving the water damage resistance of acidic aggregate asphalt mixture, so as to solve the defects of existing acidic aggregate surface modification methods that lack a systematic and accurate method for confirming the ratio of solution, resulting in excess performance and material waste.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted in this application is: A method for confirming the proportion of a surface modification solution for improving water damage resistance of an acid aggregate asphalt mixture comprises the following steps: S1: Silane coupling agent KH550, deionized water and anhydrous ethanol were mixed in six different mass ratios, and after magnetic stirring and standing, surface modification solutions with different ratios were prepared; S2: soaking the acidic aggregate with the surface modification solution of different proportions prepared in S1, and achieving surface modification of the acidic aggregate after high-temperature dehydration and curing; S3: Determine the hydrolysis status of the hydrolysis solution in S1, and observe, measure and quantify the surface modification effect of the surface-modified acidic aggregate in S2; S4: Based on the results of S3 and combined with the cost, determine the optimal ratio of the surface modification solution; S5: Use the optimal ratio of the surface modification solution determined in S4 to treat the acidic aggregate and prepare the asphalt mixture. The adhesion grade of the surface modified aggregate and the road performance of the asphalt mixture are evaluated to verify the effectiveness of the surface modification solution determined by this method in improving the anti-water damage performance.

[0008] The beneficial effects of the above scheme are: (1) This application accurately grasps the hydrolysis of KH550 in a mixed solution of water and ethanol, and determines the best hydrolysis solution for KH550; observes and measures the modification degree of the surface modification solution on the aggregate surface from a microscopic perspective, and accurately quantifies and evaluates the surface modification effect, thereby determining the best surface modification solution; (2) This application can accurately determine the ratio of the acidic aggregate surface modification solution that meets road use requirements, thereby avoiding excess performance and material waste while ensuring performance, thereby saving costs.

[0009] Furthermore, step S1 is specifically as follows: S11: The first four of the six different mass ratios of KH550, deionized water, and anhydrous ethanol are used to determine the ratio of deionized water to anhydrous ethanol, and the last two are used to determine the ratio of KH550; S12: The solution is magnetically stirred for 20 min to 25 min at room temperature, and is allowed to stand for 1 h to 1.2 h at room temperature; Further, the first four solutions in step S11 have a fixed ratio of KH550 and change the ratio of deionized water and anhydrous ethanol, and the last two solutions have a fixed ratio of deionized water and anhydrous ethanol as the optimal ratio determined based on S3 and change the ratio of KH550; The beneficial effect of the above further scheme is that the first four solution ratios can be used to determine the best hydrolysis solution suitable for KH550 hydrolysis, and the last two solution ratios can be used to determine the best KH550 ratio.

[0010] Furthermore, step S2 is specifically as follows: S21: The solution fully soaks the aggregate for 10 min; S22: Take out the aggregate treated in S21 and put it into a 160°C oven for curing for 1h; The beneficial effect of the above further scheme is to ensure that the surface modification solution fully contacts the aggregate surface and achieves sufficient modification.

[0011] Furthermore, step S3 is specifically as follows: S31: using Fourier transform infrared spectroscopy to measure the difference in characteristic peaks of functional groups of the hydrolysis solution, thereby observing the hydrolysis condition; S32: Use scanning electron microscopy and energy dispersive spectrometer to test aggregates before and after surface modification to observe and measure the surface modification effect; S33: Use a contact angle instrument to test aggregates before and after surface modification and calculate surface energy parameters, adhesion work and peeling work to quantify the surface modification effect; Further, step S31 uses 1085 cm in infrared spectrum. -1 The hydrolysis condition can be judged by the change in the intensity of the characteristic peak of -Si-OC-, because when KH550 is hydrolyzed in a mixed solution of water and ethanol, the functional group at one end of the siloxane will hydrolyze into -OH to form silanol, resulting in a decrease in -Si-OC-. Furthermore, in step S32, the surface morphology of the aggregate is observed using a scanning electron microscope to determine the modification effect, because the silanol after the hydrolysis of KH550 will undergo a condensation reaction with the hydrogen bonds on the surface of the acidic aggregate to form a chemical bond connection. At the same time, the molecules of KH550 itself undergo a condensation reaction to form a film structure covering the surface of the aggregate. The more obvious the film structure is, the better the modification effect is. Furthermore, the step S32 uses the surface atomic percentage measured by the energy spectrometer to determine the surface modification effect. Due to the presence of the modified membrane structure, the Si percentage on the aggregate surface will decrease, and the C percentage will increase significantly. The more the C element percentage, the better the coverage effect of the membrane structure and the better the surface modification effect. Furthermore, in step S33, three liquids with known surface energy parameters, namely, distilled water, ethylene glycol, and propylene glycol, are used to test the aggregate before and after surface modification, and the surface energy parameters of the aggregate are calculated according to the following simultaneous equations: ; ; In the formula, is the surface energy of the solid, is the surface energy of the liquid, is the contact angle of the liquid on the solid surface, and represent the polar and non-polar components of the solid surface energy, respectively. and They represent the polar component and non-polar component of the liquid surface energy respectively. The units of surface energy and its components are both mJ·m -2 ; Furthermore, the step S33 calculates the adhesion work and the stripping work according to the calculated surface energy parameters and the following formula. The greater the adhesion work, the better the adhesion of the asphalt-aggregate system in a dry state, and the smaller the stripping work, the less likely the asphalt film is to be stripped from the aggregate surface in the presence of water: ; ; In the formula, and are the adhesion work and the peeling work, is the surface energy of water, and represent the polar and non-polar components of aggregate surface energy, respectively. and Represent the polar and non-polar components of asphalt surface energy, and They represent the nonpolar component and polar component of water surface energy respectively. The units of adhesion work, peeling work, surface energy and its components are all mJ·m -2 .

[0012] The beneficial effects of the above further scheme are: accurately grasping the changes in the hydrolysis characteristic functional groups under different ratios of surface modification solutions, the degree of formation of the silane film on the aggregate surface, and quantifying the surface modification effect.

[0013] Furthermore, the step S5 is specifically as follows: S51: The adhesion grade is tested according to the boiling method of "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) T0616-1993; S52: The road performance is as follows: the high temperature performance index is the Marshall stability and dynamic stability, the low temperature performance index is the low temperature bending failure strain, and the water damage resistance index is the water immersion Marshall residual stability and the freeze-thaw splitting residual strength ratio.

[0014] The beneficial effect of the above further scheme is that it verifies that the surface modified solution meets the actual road performance requirements.

[0015] The present application provides a method for confirming the proportion of surface modification solution for improving the water damage resistance of acidic aggregate asphalt mixture. The method accurately grasps the hydrolysis of silane coupling agent, observes the degree of surface modification from a microscopic perspective, and accurately quantifies and evaluates the surface modification effect, thereby achieving a solution configuration that balances performance and cost requirements, greatly improving the water damage resistance of acidic aggregate asphalt mixture, and providing a reference for the improved application of acidic aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of a specific implementation method of this application; Figure 2 The infrared spectra of KH550 and the hydrolysis solution in the specific implementation mode of the present application; Figure 3The scanning electron microscope surface morphology of basalt and tuff before and after modification in the specific implementation mode of this application; Figure 4 is the surface atomic percentage of the acidic aggregate before and after modification in the specific implementation mode of this application; Figure 5 is the adhesion work of the acidic aggregate before and after modification in the specific implementation mode of this application; Figure 6 The stripping work of the acidic aggregate before and after modification in the specific implementation mode of the present application; Figure 7 It is the adhesion work and peeling work of the acidic aggregate before and after modification by the surface modification solution of silane coupling agent with different concentrations in the specific embodiment of the present application. DETAILED DESCRIPTION

[0017] The present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, a method for confirming the proportion of a surface modification solution for improving water damage resistance of an acid aggregate asphalt mixture comprises the following steps: S1: Silane coupling agent KH550, deionized water and anhydrous ethanol were mixed in six different mass ratios, and after magnetic stirring and standing, surface modification solutions with different ratios were prepared; In step S1, the first four of the six different mass ratios of KH550, deionized water, and anhydrous ethanol are used to determine the ratio of deionized water and anhydrous ethanol, and the ratio of deionized water and anhydrous ethanol is changed to fix the ratio of KH550, as shown in 1-1 to 1-4 in Table 1; the last two are used to determine the ratio of KH550, and the ratio of deionized water and anhydrous ethanol is fixed to the optimal ratio determined based on S3, and the ratio of KH550 is changed, as shown in 2-1 to 2-2 in Table 1. The magnetic stirring time of the solution is 20 minutes at room temperature, and the standing time is 1 hour at room temperature; Table 1 Surface modification solution ratio

[0019] S2: soaking the acidic aggregate with the surface modification solution of different proportions prepared in S1, and achieving surface modification of the acidic aggregate after high-temperature dehydration and curing; The aggregate used in step S2 is acidic tuff excavated in Fujian Province, and high-quality basalt produced by Sichuan Minerals is used for comparison. The surface modification solution is fully soaked in the aggregate for 10 minutes, and then the treated aggregate is taken out and placed in a 160°C oven for curing for 1 hour; S3: Determine the hydrolysis status of the hydrolysis solution in S1, and observe, measure and quantify the surface modification effect of the surface-modified acidic aggregate in S2; In step S3, Fourier transform infrared spectroscopy was used to determine the difference in the characteristic peaks of the functional groups of the hydrolysis solution. When KH550 was hydrolyzed in a mixed solution of water and ethanol, the functional group at one end of the siloxane would be hydrolyzed into -OH to form silanol, resulting in a decrease in -Si-OC-. Therefore, the peak at 1085 cm in the infrared spectrum was used. -1 The hydrolysis condition can be judged by the change of the characteristic peak intensity of -Si-OC-. Figure 2 As shown, the -Si-OC- characteristic peak of solution 1-3 is the weakest, indicating that its hydrolysis degree is the highest.

[0020] A scanning electron microscope and an energy dispersive spectrometer are used to test the aggregates before and after surface modification to observe and measure the surface modification effect. This is because the silanol after the hydrolysis of KH550 will undergo a condensation reaction with the hydrogen bonds on the surface of the acidic aggregate to form a chemical bond connection. At the same time, a condensation reaction occurs between the molecules of KH550 itself to form a film structure covering the surface of the aggregate. The more obvious the film structure, the better the modification effect. And due to the existence of the modified membrane structure, the proportion of Si on the aggregate surface will decrease, and the proportion of C will increase significantly. The higher the proportion of C elements, the better the coverage effect of the membrane structure and the better the surface modification effect. Figure 3 As shown in the figure, by observing the surface of the tuff modified by solution 1-3 and solution 1-4, it can be found that a layer of velvety mesh "film" is obviously formed, among which the film of the tuff modified by solution 1-3 is particularly obvious. Figure 4 As shown in the figure, compared with the unmodified tuff, the Si proportion on the surface of the modified tuff decreased, and the C proportion increased significantly. The increase in the C atom proportion on the surface of the tuff after 1-3 modification was the most obvious.

[0021] The contact angles of the aggregates before and after surface modification were tested using distilled water, ethylene glycol, and propylene glycol, three liquids with known surface energy parameters, respectively, and the surface energy parameters of the aggregates were calculated using the following simultaneous equations: ; ; In the formula, is the surface energy of the solid, is the surface energy of the liquid, is the contact angle of the liquid on the solid surface, and represent the polar and non-polar components of the solid surface energy, respectively. and They represent the polar component and non-polar component of the liquid surface energy respectively. The units of surface energy and its components are mJ·m -2 .

[0022] The adhesion work and stripping work are calculated according to the calculated surface energy parameters and the following formula. The asphalt used is No. 70 base asphalt and SBS modified asphalt with a dosage of 4.2%. The larger the adhesion work, the better the adhesion of the asphalt-aggregate system under dry conditions, and the smaller the stripping work, the less likely the asphalt film is to be stripped from the aggregate surface under water conditions: ; ; In the formula, and are the adhesion work and the peeling work, is the surface energy of water, and represent the polar and non-polar components of aggregate surface energy, respectively. and Represent the polar and non-polar components of asphalt surface energy, and They represent the nonpolar component and polar component of water surface energy respectively. The units of adhesion work, peeling work, surface energy and its components are all mJ·m -2 .

[0023] like Figure 5 and Figure 6 As shown, after modification, the adhesion work of tuff and asphalt is slightly increased, and the stripping work is significantly reduced. Among them, the tuff modified with 1-3 solution has the most obvious improvement, basically reaching the level of basalt, followed by the tuff modified with 1-4 solution.

[0024] S4: Based on the results of S3, combined with the cost, the optimal ratio of the hydrolysis solution is determined to be deionized water: anhydrous ethanol = 90:5. Based on this, the ratio of the 2-1 solution in Table 1 is determined to be KH550: water: anhydrous ethanol = 10:86:4, and the ratio of the 2-2 solution is KH550: deionized water: anhydrous ethanol = 15:82:3. Figure 7 As shown, it can be found that although the concentration of KH550 in solution 2-1 and solution 2-2 is higher than that in solution 1-3, their adhesion work is reduced and the peeling work is increased. Therefore, considering the modification effect and cost, the best ratio of KH550: deionized water: anhydrous ethanol is determined to be 5:90:5 for the surface modification solution of this embodiment.

[0025] S5: Use the optimal ratio of the surface modification solution determined in S4 to treat the acidic aggregate and prepare the asphalt mixture. The adhesion grade of the surface modified aggregate and the road performance of the asphalt mixture are evaluated to verify the effectiveness of the surface modification solution determined by this method in improving the anti-water damage performance.

[0026] The adhesion level described in step S5 is tested according to the boiling method of "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) T0616-1993. As shown in Table 2, the adhesion level of the tuff modified by the 1-3 solution to the matrix asphalt is significantly improved from level 3 to level 5. The adhesion level of the tuff modified by the 2-1 solution to the matrix asphalt is also improved from level 3 to level 5, but the concentration of the silane coupling agent used is high and the cost is high. In addition, the adhesion level of all aggregates to SBS modified asphalt is level 5. This is because the boiling method will be affected by the cohesive properties of asphalt. The cohesive properties of SBS modified asphalt are strong, and the asphalt film is not easily destroyed by the boiling method. The results of the adhesion level also prove that the 1-3 solution is the best ratio for the surface modification solution with tuff.

[0027] Table 2 Adhesion grade of tuff and asphalt after modification with different ratios of modified solutions

[0028] The road performance is high temperature performance index - Marshall stability and dynamic stability, low temperature performance index - low temperature bending failure strain, water damage resistance index - immersion Marshall residual stability and freeze-thaw splitting residual strength ratio. The types of asphalt mixtures used are AC-13 and SMA-13. As shown in Tables 3 and 4, compared with the unmodified tuff asphalt mixture, the high temperature performance, low temperature performance, and water damage resistance of the modified tuff asphalt mixture are significantly improved, all meeting the requirements of the specification and reaching a level similar to that of basalt asphalt mixture.

[0029] Table 3 Road performance of AC-13 asphalt mixtures prepared with different aggregates

[0030] Table 4 Road performance of SMA-13 ​​asphalt mixtures prepared with different aggregates

Claims

1. A method for confirming the proportion of a surface modification solution for improving water damage resistance of an acid aggregate asphalt mixture, characterized in that: The method comprises the following steps: S1: Silane coupling agent KH550, deionized water and anhydrous ethanol were mixed in six different mass ratios, and surface modification solutions with different ratios were prepared after magnetic stirring and standing. S2: soaking the acidic aggregate with the surface modification solution of different proportions prepared in S1, and achieving surface modification of the acidic aggregate after high-temperature dehydration and curing; S3: Determine the hydrolysis status of the hydrolysis solution in S1, and observe, measure and quantify the surface modification effect of the surface-modified acidic aggregate in S2; S4: Based on the results of S3 and combined with the cost, determine the optimal ratio of the surface modification solution; S5: Use the optimal ratio of the surface modification solution determined in S4 to treat the acidic aggregate and prepare the asphalt mixture. The adhesion grade of the surface modified aggregate and the road performance of the asphalt mixture are evaluated to verify the effectiveness of the surface modification solution determined by this method in improving the anti-water damage performance.

2. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acidic aggregate asphalt mixture according to claim 1, characterized in that: Step S1 is specifically as follows: S11: The first four of the six different mass ratios of KH550, deionized water and anhydrous ethanol are used to determine the ratio of deionized water and anhydrous ethanol, and the last two are used to determine the ratio of KH550; S12: The magnetic stirring time of the solution is 20min-25min at room temperature, and the standing time is 1h-1.2h at room temperature.

3. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acidic aggregate asphalt mixture according to claim 1, characterized in that: The first four solutions in step S1 have a fixed ratio of KH550 and change the ratio of deionized water and anhydrous ethanol. The last two solutions have a fixed ratio of deionized water and anhydrous ethanol based on the optimal ratio determined in S3 and change the ratio of KH550.

4. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acidic aggregate asphalt mixture according to claim 1, characterized in that: Step S2 is specifically as follows: S21: The solution fully soaks the aggregate for 10 min; S22: Take out the aggregate treated in S21 and put it into a 160°C oven for curing for 1 hour.

5. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acidic aggregate asphalt mixture according to claim 1, characterized in that: Step S3 is specifically as follows: S31: using Fourier transform infrared spectroscopy to measure the difference in characteristic peaks of functional groups of the hydrolysis solution, thereby observing the hydrolysis condition; S32: Use scanning electron microscopy and energy dispersive spectrometer to test aggregates before and after surface modification to observe and measure the surface modification effect; S33: The aggregates before and after surface modification were tested using a contact angle instrument and the surface energy parameters, adhesion work and peeling work were calculated to quantify the surface modification effect.

6. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acidic aggregate asphalt mixture according to claim 5, characterized in that: Step S31 uses the infrared spectrum at 1085 cm -1 The hydrolysis situation can be judged by the change of the intensity of the characteristic peak of -Si-OC-; The step S32 uses a scanning electron microscope to observe the surface morphology of the aggregate to determine the modification effect; Step S32 uses the surface atomic percentage measured by an energy spectrometer to determine the surface modification effect; Step S33 uses distilled water, ethylene glycol, and propylene glycol, three liquids with known surface energy parameters, to test the aggregate before and after surface modification, and calculates the aggregate surface energy parameters according to the following simultaneous equations: ； ； In the formula, is the surface energy of the solid, is the surface energy of the liquid, is the contact angle of the liquid on the solid surface, and represent the polar and non-polar components of the solid surface energy, respectively. and They represent the polar component and non-polar component of the liquid surface energy respectively. The units of surface energy and its components are both mJ·m -2 Step S33 calculates the adhesion work and the stripping work according to the calculated surface energy parameters and the following formula. The greater the adhesion work, the better the adhesion of the asphalt-aggregate system in dry conditions. The smaller the stripping work, the less likely the asphalt film is to be stripped from the aggregate surface in the presence of water: ； ； In the formula, and are the adhesion work and the peeling work, is the surface energy of water, and represent the polar and non-polar components of aggregate surface energy, respectively. and Represent the polar and non-polar components of asphalt surface energy, and They represent the nonpolar component and polar component of water surface energy respectively. The units of adhesion work, peeling work, surface energy and its components are all mJ·m -2 .

7. The method for confirming the proportion of a surface modification solution for improving water damage resistance of an acid aggregate asphalt mixture according to claim 1, characterized in that: Step S5 is specifically as follows: S51: the adhesion grade is tested by the boiling method according to the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011) T0616-1993; S52: The road performance is as follows: the high temperature performance index is the Marshall stability and dynamic stability, the low temperature performance index is the low temperature bending failure strain, and the water damage resistance index is the water immersion Marshall residual stability and the freeze-thaw splitting residual strength ratio.

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