Method for determining the temperature and time for preparing evaporation residue of thermosetting modified emulsified asphalt

Abstract

The present invention discloses a method for determining the preparation temperature and time of evaporation residue of thermosetting modified emulsified asphalt. The method first obtains a white ratio value based on a binary processing analysis after the thermosetting modified emulsified asphalt is stabilized by low-temperature evaporation, so as to determine the range of feasible temperatures and record the bubble print ablation time T1. Then, based on the feasible temperature, the performance stabilization time T2 is recorded through a needle penetration experiment. Combined with the recorded bubble print ablation time T1 and the performance stabilization time T2, the preparation temperature and time of the evaporation residue are determined. Based on the above method, the temperature and time selection for preparing the residue by the low-temperature evaporation method are unified. The temperature selection will be affected by the performance stabilization time T2, that is, the low-temperature evaporation time. At the same time, the low-temperature evaporation time also varies with the different selected temperatures, which effectively controls the arbitrariness of the current low-temperature evaporation method in selecting temperature and time. Based on the present method, a residue with good performance can be prepared.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering detection, and in particular to a method for determining the preparation temperature and time of evaporation residue of thermosetting modified emulsified asphalt. Background Art

[0002] In recent years, water-based epoxy-modified emulsified asphalt has been increasingly used in the field of road engineering materials for improving asphalt pavement functional layers, pavement repairs, and cold-mix asphalt mixtures, due to its ability to effectively improve the poor adhesion and temperature sensitivity of emulsified asphalt. Furthermore, water-based epoxy resin-modified emulsified asphalt can be used to produce high-performance modified emulsified asphalt that combines the advantages of emulsified asphalt with high strength, high adhesion, and excellent durability, leading to the gradual promotion of this material. With the in-depth study of water-based epoxy-modified emulsified asphalt, specific performance indicators need to be tested. Typically, emulsified asphalt is subjected to the direct evaporation method specified in T0651 of the Asphalt Test Procedure JTG E20-2011 to obtain a residue, and the properties of the residue are studied to evaluate the asphalt performance.

[0003] However, the incorporation of waterborne epoxy resin fundamentally changes the properties of emulsified asphalt. Waterborne epoxy emulsified asphalt no longer has the thermoplastic properties of asphalt and becomes a thermosetting material. As a thermosetting material, waterborne epoxy resin does not have the properties of being able to flow and deform when heated, and can maintain a certain shape after cooling; in addition, when using traditional methods to prepare evaporation residues, high temperatures will damage the stable structure formed by the curing of waterborne epoxy, which greatly reduces the performance of waterborne epoxy emulsified asphalt, resulting in the final test results not reflecting the actual performance. Obviously, the existing traditional methods for obtaining evaporation residues are no longer applicable to this thermosetting modified emulsified asphalt, which also shows that there is no standardized method for obtaining evaporation residues in the field of road engineering testing technology for waterborne epoxy modified emulsified asphalt.

[0004] At present, the common method used by domestic and foreign scholars for water-based epoxy modified emulsified asphalt is to use low-temperature evaporation to obtain residues. The low temperature generally ranges from 60℃ to 100℃. In terms of evaporation time, if the time is too long, it will not be effective, and if it is too short, residues with stable performance cannot be obtained. Therefore, in existing research, there is no unified low-temperature evaporation temperature and time. Therefore, it is impossible to obtain residues with good performance by unifying the temperature and time of low-temperature evaporation. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt. This method can effectively unify the temperature and time of low-temperature evaporation, and thereby obtain a residue with good performance.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A method for determining the temperature and time for preparing evaporation residue of thermosetting modified emulsified asphalt comprises the following steps:

[0008] S1: pre-treating the thermosetting modified emulsified asphalt to obtain multiple first experimental groups and second experimental groups;

[0009] S2: placing the first experimental group in different evaporation temperature environments, and obtaining pictures of each first experimental group at multiple moments;

[0010] S3: Binarize the captured image to obtain a binary image, and obtain the white ratio value corresponding to each first experimental group at each moment through the binary image;

[0011] S4: Filter out the white proportion value that meets the threshold condition, take the evaporation temperature corresponding to the white proportion value that meets the threshold condition as the feasible temperature, and record the bubble print ablation time T1 corresponding to the feasible temperature;

[0012] S5: Conduct a needle penetration test on the second experimental group placed at the feasible temperature to obtain the needle penetration value. Based on the needle penetration value requirements, screen and record the performance stabilization time T2 corresponding to different feasible temperatures;

[0013] S6: Determine the evaporation residue preparation temperature and evaporation residue preparation time according to the bubble print ablation time T1 and the performance stabilization time T2.

[0014] Furthermore, in S1, the specific steps of pre-treating the thermosetting modified emulsified asphalt to obtain the first experimental group are:

[0015] (1) Weigh the thermosetting modified emulsified asphalt sample;

[0016] (2) The symmetrically taken thermosetting modified emulsified asphalt sample is slowly heated and stirred until the thermosetting modified emulsified asphalt sample becomes viscous;

[0017] (3) adding a curing agent to the viscous thermosetting modified emulsified asphalt sample and continuing to heat until the viscous thermosetting modified emulsified asphalt sample recovers its fluidity, and pouring the recovered fluidity thermosetting modified emulsified asphalt sample into multiple evaporating dishes;

[0018] (4) After the evaporating dishes have been left to stand for a first preset time, each evaporating dish is numbered to obtain a plurality of first experimental groups.

[0019] Furthermore, in S1, the specific steps of pre-treating the thermosetting modified emulsified asphalt to obtain the second experimental group are:

[0020] Repeat steps (1) to (3); pour the thermosetting modified emulsified asphalt sample that has recovered its fluid state into multiple sample dishes, and let the sample dishes stand for a second preset time to obtain a second experimental group.

[0021] Furthermore, in S2, two first experimental groups are placed in a blast oven at 70°C, 80°C, 90°C, and 100°C, respectively, and photos of each first experimental group are taken at multiple moments until the bubble marks on the surfaces of the thermosetting modified emulsified asphalt samples in the first experimental groups no longer change.

[0022] Furthermore, in S3, the captured image is binarized using matlab software to obtain a binarized image.

[0023] Furthermore, in S4, the threshold condition is that the white ratio value is ≤ 0.01%.

[0024] Furthermore, in S5, the second experimental group is placed at a feasible temperature, and the mass of the residue in the second experimental group is measured at intervals of a third preset time until the difference between two consecutive measured masses is less than 0.01 g.

[0025] Furthermore, in S5, a needle penetration test is conducted on the second experimental group placed at a feasible temperature, and three moments corresponding to the difference between the maximum and minimum needle penetration values ​​of three consecutive moments is less than 0.2 mm are screened out, and the middle moment among the three moments is taken as the performance stabilization time T2.

[0026] Furthermore, the thermosetting modified emulsified asphalt adopts water-based epoxy modified emulsified asphalt.

[0027] Furthermore, the specific steps of S6 are: calculating the performance stabilization time T2 and the bubble print ablation time T1 corresponding to different feasible temperatures to obtain multiple groups of difference absolute values, and by comparing the multiple groups of difference absolute values, taking the feasible temperature value corresponding to the smallest difference absolute value as the evaporation residue preparation temperature, and taking the performance stabilization time corresponding to the feasible temperature value as the evaporation residue preparation time.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a method for determining the preparation temperature and time of evaporation residue of thermosetting modified emulsified asphalt. The method first determines the range of feasible temperature after the thermosetting modified emulsified asphalt is stabilized by low-temperature evaporation, and then records the white ratio value obtained by binarization processing analysis, based on the feasible temperature, and then records the performance stabilization time T2 through a needle penetration experiment. Combined with the recorded bubble ablation time T1 and the performance stabilization time T2, the preparation temperature and time of the evaporation residue are determined. Based on the above method, the temperature and time selection for preparing the residue by the low-temperature evaporation method are unified. The temperature selection will be affected by the performance stabilization time T2, that is, the low-temperature evaporation time. At the same time, the low-temperature evaporation time also varies with different selected temperatures, which effectively controls the arbitrariness of the current low-temperature evaporation method in selecting temperature and time. Moreover, the determination of temperature and time by the present method can prepare a residue with good performance.

[0030] Compared with the traditional method of directly obtaining the residue of emulsified asphalt by evaporation, the present invention can effectively eliminate the damage caused by high temperature to the stable structure formed by the solidification of thermosetting modified emulsified asphalt, and greatly reduce the performance of thermosetting modified emulsified asphalt, resulting in the final test results not reflecting the actual performance. At the same time, the residue obtained by this method is uniform in nature and has no variability. The test results of the residue performance are highly accurate and practical, and can reflect the actual performance. In addition, the present method not only standardizes the temperature and time of the low-temperature evaporation method, but also supplements the feasible preparation method of the thermosetting modified emulsified asphalt residue, so that the measured performance of the epoxy resin modified emulsified asphalt residue can be unified with the specification standards.

[0031] Preferably, this method uses the condition that the surface of the sample is smooth and flat after the low-temperature evaporation is stable (i.e., the white ratio is ≤0.01% when the value is stable) to determine the range of feasible temperatures, and then selects the feasible temperature with the smallest stable time difference ΔT as the temperature for preparing the evaporation residue based on the feasible temperature. The smaller ΔT is, the closer the performance stabilization time T2 is to the bubble mark ablation time T1. After the bubble mark absorpts at T1, the surface of the sample is smooth and flat, and the properties are uniform. Thereafter, the closer the performance stabilization time T2 of the sample is to T1, that is, the smaller ΔT is, the more time waste can be reduced, and the overall low-temperature evaporation time of the residue is also reduced. The low-temperature evaporation temperature and time of the epoxy-modified emulsified asphalt sample obtained based on the above scheme make the temperature and time selection for preparing the residue by the low-temperature evaporation method uniform. The choice of temperature will be affected by the performance stabilization time T2, that is, the low-temperature evaporation time. At the same time, the low-temperature evaporation time also varies due to different selected temperatures. This also effectively controls the arbitrariness of the current low-temperature evaporation method in selecting temperature and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1( a ) shows the evolution of binary images at different evaporation temperatures (just after casting and after 12 hours at room temperature) provided by an embodiment of the present invention;

[0033] FIG1( b ) shows the evolution process of the binary image at different evaporation temperatures provided by an embodiment of the present invention (different temperatures in the second stage);

[0034] Figure 2 A graph showing the relationship between the white ratio and time at different evaporation temperatures provided by an embodiment of the present invention;

[0035] Figure 3 An analysis chart of the white ratio development trend at a relatively low evaporation temperature (≤80°C) provided by an embodiment of the present invention;

[0036] Figure 4 An analysis chart of the white ratio development trend at higher evaporation temperatures (>80°C) provided by an embodiment of the present invention;

[0037] Figure 5 The relationship between the residual mass, needle penetration and time at a feasible temperature (70°C) provided by the embodiment of the present invention;

[0038] Figure 6 A graph showing the relationship between the mass of residue at a feasible temperature (80°C), needle penetration and time provided by an embodiment of the present invention;

[0039] Figure 7 The present invention provides a flow chart of a method for determining the temperature and time for preparing evaporation residue of thermosetting modified emulsified asphalt. DETAILED DESCRIPTION

[0040] The present invention provides a method for determining the temperature and time for preparing evaporation residue of thermosetting modified emulsified asphalt, comprising the following steps:

[0041] S1: Pre-treating thermosetting modified emulsified asphalt (waterborne epoxy modified emulsified asphalt) to obtain multiple first experimental groups and second experimental groups;

[0042] The specific steps for pre-treating the thermosetting modified emulsified asphalt to obtain the first experimental group are as follows:

[0043] (1) Weigh the thermosetting modified emulsified asphalt sample;

[0044] (2) The symmetrically taken thermosetting modified emulsified asphalt sample is slowly heated and stirred until the thermosetting modified emulsified asphalt sample becomes viscous;

[0045] (3) adding a curing agent to the viscous thermosetting modified emulsified asphalt sample and continuing to heat until the viscous thermosetting modified emulsified asphalt sample recovers its fluidity, and pouring the recovered fluidity thermosetting modified emulsified asphalt sample into multiple evaporating dishes;

[0046] (4) After the evaporating dishes have been left to stand for a first preset time, each evaporating dish is numbered to obtain a plurality of first experimental groups.

[0047] In addition, the specific steps of pre-treating the thermosetting modified emulsified asphalt to obtain the second experimental group are as follows:

[0048] Repeat the above steps (1) to (3); pour the thermosetting modified emulsified asphalt sample that has recovered its fluid state into multiple sample dishes, and let the sample dishes stand for a second preset time to obtain a second experimental group.

[0049] S2: placing the first experimental group in different evaporation temperature environments, and obtaining pictures of each first experimental group at multiple moments;

[0050] Specifically, two first experimental groups were placed in a blast oven at 70°C, 80°C, 90°C and 100°C respectively, and photos of each first experimental group were taken at multiple moments until the bubble marks on the surfaces of the thermosetting modified emulsified asphalt samples in the first experimental group no longer changed.

[0051] S3: Using MATLAB software to perform binarization processing on the captured images to obtain binary images, and obtaining the white proportion value corresponding to each first experimental group at each time through the binary images;

[0052] S4: Filter out the white proportion value that meets the threshold condition, take the evaporation temperature corresponding to the white proportion value that meets the threshold condition as the feasible temperature, and record the bubble ablation time T1 corresponding to the feasible temperature; the above threshold condition is that the white proportion value ≤ 0.01%.

[0053] S5: Conduct a needle penetration test on the second experimental group placed at the feasible temperature to obtain the needle penetration value. Based on the needle penetration value requirements, record the performance stabilization time T2 corresponding to different feasible temperatures;

[0054] Specifically: placing the second experimental group at a feasible temperature, and measuring the mass of the residue in the second experimental group at intervals of a third preset time, until the difference between two consecutive measured masses is less than 0.01 g.

[0055] A needle penetration test was conducted on the second experimental group placed at a feasible temperature, and three moments corresponding to the difference between the maximum and minimum needle penetration values ​​of three consecutive moments was less than 0.2mm were screened out. The middle moment among the three moments was taken as the performance stabilization time T2.

[0056] S6: Determine the evaporation residue preparation temperature and evaporation residue preparation time according to the bubble print ablation time T1 and the performance stabilization time T2.

[0057] The specific steps are: calculate the performance stabilization time T2 and the bubble print ablation time T1 corresponding to different feasible temperatures to obtain multiple groups of difference absolute values. By comparing the multiple groups of difference absolute values, the feasible temperature value corresponding to the smallest difference absolute value is used as the evaporation residue preparation temperature, and the performance stabilization time corresponding to the feasible temperature value is used as the evaporation residue preparation time.

[0058] The present invention will be further described below with reference to the accompanying drawings and examples.

[0059] Example

[0060] As preferred embodiments of the present invention are as follows:

[0061] As described in the background art, in the prior art, there is currently no unified low-temperature evaporation temperature and time for obtaining a residue with good performance. Therefore, it is necessary to explore a method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt. Therefore, this embodiment provides a method for determining the effective construction time of a mixing type water-based epoxy emulsified asphalt. In this embodiment, the thermosetting modified emulsified asphalt can be a composite modified emulsified asphalt with an epoxy resin modifier. The following uses a water-based epoxy emulsified asphalt that is first emulsified and then modified. The solid content of the emulsified asphalt is 60%. This embodiment is used to determine the temperature and time for preparing the residue of the modified asphalt with a 10% epoxy resin content. The specific steps are as follows:

[0062] Step 1: Preparation: Preparation of the residue evaporating dish. The specific steps are as follows:

[0063] The first step is to prepare a metal plate and a glass rod, wash them, dry them, and weigh the total mass (m1). Then use the metal plate to weigh the prepared water-based epoxy-modified emulsified asphalt sample without adding a curing agent. Weigh the total mass (m2) of the metal plate, glass rod, and emulsion (the abbreviation of the water-based epoxy-modified emulsified asphalt sample) so that m2-m1=300±1g, and the weighed mass is accurate to 0.1g.

[0064] The second step is to place the metal plate containing the sample together with the glass rod on an electric furnace with an asbestos pad and slowly heat it while stirring with the glass rod. This process usually does not exceed 30 minutes until the sample becomes viscous and begins to lose its fluidity.

[0065] The third step is to add the appropriate curing agent to the sample, continue heating and stirring with a glass rod, and pour the sample into the evaporating dish while it recovers its fluidity. This typically takes 3-5 minutes. The sample temperature must not drop significantly during the pouring process; constant stirring and heating are required to maintain the temperature.

[0066] Step 4: Repeat steps 1 to 3 to obtain 8 sets of evaporating dishes, and place the evaporating dishes containing the samples at room temperature for at least 12 hours to prepare for the low-temperature evaporation process.

[0067] Step 2: Number the 8 groups of evaporating dishes as 70-Ⅰ, 70-Ⅱ, 80-Ⅰ, 80-Ⅱ, 90-Ⅰ, 90-Ⅱ, 100-Ⅰ, and 100-Ⅱ, and use a mobile phone to select a suitable angle to take pictures of them.

[0068] Step 3: Place the evaporating dishes No. 70-Ⅰ and 70-Ⅱ in a blast oven preheated to 70°C; place the evaporating dishes No. 80-Ⅰ and 80-Ⅱ in a blast oven preheated to 80°C; place the evaporating dishes No. 90-Ⅰ and 90-Ⅱ in a blast oven preheated to 90°C; place the evaporating dishes No. 100-Ⅰ and 100-Ⅱ in a blast oven preheated to 100°C.

[0069] Step 4: Perform subsequent operations in a blast oven at different temperatures of 70°C, 80°C, 90°C, and 100°C. The specific steps are as follows:

[0070] The first step is to start timing from the time the evaporating dish is placed in the blast oven. Use a mobile phone to take pictures at a suitable angle at times of 1h, 2h, 3h, 4h, 5h, 6h, 9h, 12h, 18h..., and take pictures at intervals of 6h after 12h until the bubble mark on the surface of the sample no longer changes.

[0071] In the second step, the pictures taken at each moment were binarized using MATLAB software, and the proportion of the cumulative number of white pixels to the total number of pixels was calculated. The proportion of white pixels at each moment was equal to the average value of the two groups of experiments.

[0072] Step 5: According to the change process of the white proportion under the four low-temperature evaporation temperatures, find the low-temperature evaporation temperature at which the white proportion value is ≤0.01% under the condition of stable white proportion, and call this temperature the feasible temperature. Record the time T1 corresponding to the first time the white proportion value is ≤0.01% at this temperature as the bubble print ablation time.

[0073] The feasible temperatures of the material are 70°C and 80°C, and the recording times are T1,70=36h; T1,80=42h respectively.

[0074] Step 6: Replace the evaporating dish with a sample dish with needle penetration, weigh the mass M of the sample dish, perform the first to third steps of the above step 1 to obtain the sample, and place the sample dish containing the sample at room temperature and let it stand for not less than 12 hours.

[0075] Step 7: Weigh the total mass m0 of the sample dish and the sample. Start timing from the moment the sample dish is placed in the blast oven preheated to 70℃ and 80℃ respectively. Use an electronic scale with an accuracy of 0.01g to weigh the total mass every 3 hours and record it as m3, m6, m9, etc. until the difference between the two consecutive total masses is less than 0.01g. Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 This is a relationship diagram between the residue mass, needle penetration and time. Through this relationship, T2 can be determined to determine whether the T2 obtained by the needle penetration test is accurate.

[0076] Step 8: Starting from the 24th hour, conduct a needle penetration test at 25°C every 6 hours. The end judgment is: stop when the difference between the maximum and minimum values ​​of the needle penetration values ​​at three consecutive moments is less than 0.2mm (the graduation value is 0.1mm), and record the middle time of the three moments as T2 as the performance stabilization time. The recorded times are T2, 70 =54h; T2, 80 =42h.

[0077] Step 9, data processing; calculate ΔT = |T2-T1|, respectively ΔT 70 =18h;ΔT 80 =0h; because ΔT 70 >ΔT 80 Therefore, 80℃ was selected as the low-temperature preparation temperature of the evaporation residue of this sample, and T2=42h was selected as the low-temperature preparation time of the evaporation residue.

[0078] Draw a graph with time as the horizontal axis and m0-M, m3-M, m6-M, etc. as the vertical axis. Analyzing the graph, when the mass difference between two consecutive times is 0, the time corresponding to the previous one is T3 = 54 hours. T3 represents the evaporation time of the residue when the water in the material is completely evaporated.

[0079] For modified emulsified asphalt with different epoxy content of 3%, 5%, and 15%, the present invention was applied to obtain the evaporation residue preparation temperature and time. The specific results are shown in Table 1 below.

[0080] Table 1 shows the temperature and time schedule for the preparation of residues of modified emulsified asphalt with different epoxy content.

[0081] To ensure the orderly progress of the experiment, if there are not enough blast ovens to carry out low-temperature evaporation tests at four temperatures at the same time, two sets of evaporating dishes can be obtained in step one and placed in a blast oven preheated to 70°C to carry out step four. After completion, start 80°C, 90°C, and 100°C in sequence.

[0082] The results in Table 1 show that the epoxy resin content has no effect on the preparation temperature of the modified emulsified asphalt evaporation residue, but it has a significant impact on the corresponding preparation time. The optimal preparation temperature for the residue is 80°C, but the preparation time increases with the increase of waterborne epoxy resin.

[0083] Depend on Figure 2 The relationship between the white ratio and time at different evaporation temperatures shows that the binary image has two development trends at the four temperatures, namely lower evaporation temperature (70℃, 80℃) and higher evaporation temperature (90℃, 100℃). Figure 3 and Figure 4 .

[0084] The principle of temperature selection is to first determine the range of feasible temperatures after the low-temperature evaporation stabilizes and the surface of the sample is smooth and flat (i.e., the white ratio is ≤0.01% when the value is stable). Then, based on the feasible temperature, the feasible temperature with the smallest stable time difference ΔT is selected as the temperature for preparing the evaporation residue. The smaller ΔT is, the closer the performance stabilization time T2 is to the bubble mark ablation time T1. After the bubble mark absorpts at T1, the surface of the sample is smooth and flat, and the properties are uniform. Thereafter, the closer the performance stabilization time T2 of the sample is to T1, that is, the smaller ΔT is, the more time waste can be reduced, and the overall low-temperature evaporation time of the residue is also reduced. The low-temperature evaporation temperature and time of the epoxy-modified emulsified asphalt sample obtained based on the above scheme make the temperature and time selection for preparing the residue by the low-temperature evaporation method uniform. The choice of temperature will be affected by the performance stabilization time T2, that is, the low-temperature evaporation time. At the same time, the low-temperature evaporation time also varies due to different selected temperatures. This also effectively controls the arbitrariness of the current low-temperature evaporation method in selecting temperature and time.

[0085] The determination method provided in this embodiment standardizes the existing method of obtaining residues by low-temperature evaporation. Compared with the traditional direct evaporation method for obtaining emulsified asphalt residues, it can effectively eliminate the damage caused by high temperature to the stable structure formed by water-based epoxy curing, and greatly reduce the performance of water-based epoxy emulsified asphalt, resulting in the final test results not reflecting the actual performance. At the same time, the residue obtained by this method is uniform in nature and has no variability. The test results of the residue performance are highly accurate and practical, and can reflect the actual performance. In addition, this method not only standardizes the temperature and time of the low-temperature evaporation method, but also supplements the feasible preparation method of epoxy resin modified emulsified asphalt residue, so that the measured performance of the epoxy resin modified emulsified asphalt residue can be unified with the specification standards.

[0086] Although the embodiments of the present invention have been described above with reference to the accompanying drawings and examples, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and are not restrictive. A person skilled in the art, guided by the description, can also make various forms without departing from the scope of protection of the claims of the present invention, and all of these forms fall within the scope of protection of the present invention.

Claims

1. A method for determining the temperature and time for preparing evaporation residue of thermosetting modified emulsified asphalt, characterized in that: The steps are as follows: S1: pre-treating the thermosetting modified emulsified asphalt to obtain multiple first experimental groups and second experimental groups; S2: placing the first experimental group in different evaporation temperature environments, and obtaining pictures of each first experimental group at multiple moments; S3: Binarize the captured image to obtain a binary image, and obtain the white ratio value corresponding to each first experimental group at each moment through the binary image; S4: Filter out the white proportion value that meets the threshold condition, take the evaporation temperature corresponding to the white proportion value that meets the threshold condition as the feasible temperature, and record the bubble print ablation time T1 corresponding to the feasible temperature; S5: Conduct a needle penetration test on the second experimental group placed at the feasible temperature to obtain the needle penetration value. Based on the needle penetration value requirements, screen and record the performance stabilization time T2 corresponding to different feasible temperatures; S6: determining the evaporation residue preparation temperature and the evaporation residue preparation time according to the bubble print ablation time T1 and the performance stabilization time T2; In S2, two first experimental groups are placed in a blast oven at 70°C, 80°C, 90°C, and 100°C, respectively, and photographs are taken of each first experimental group at multiple times until the bubble marks on the surfaces of the thermosetting modified emulsified asphalt samples in the first experimental group no longer change; The specific steps of S6 are: calculating the performance stabilization time T2 and the bubble print ablation time T1 corresponding to different feasible temperatures to obtain multiple groups of difference absolute values; by comparing the multiple groups of difference absolute values, the feasible temperature value corresponding to the smallest difference absolute value is used as the evaporation residue preparation temperature, and the performance stabilization time corresponding to the feasible temperature value is used as the evaporation residue preparation time.

2. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, characterized in that: In S1, the specific steps of pre-treating the thermosetting modified emulsified asphalt to obtain the first experimental group are: (1) Weigh the thermosetting modified emulsified asphalt sample; (2) The symmetrically taken thermosetting modified emulsified asphalt sample is slowly heated and stirred until the thermosetting modified emulsified asphalt sample becomes viscous; (3) Adding a curing agent to the viscous thermosetting modified emulsified asphalt sample and continuing to heat until the viscous thermosetting modified emulsified asphalt sample recovers its fluidity, and pouring the recovered fluidity thermosetting modified emulsified asphalt sample into multiple evaporating dishes; (4) After the evaporating dishes have been left to stand for a first preset time, each evaporating dish is numbered to obtain a plurality of first experimental groups.

3. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 2, characterized in that: In S1, the specific steps of pre-treating the thermosetting modified emulsified asphalt to obtain the second experimental group are: Repeat steps (1) to (3); pour the thermosetting modified emulsified asphalt sample that has recovered its fluid state into a plurality of sample dishes, and let the sample dishes stand for a second preset time to obtain a second experimental group.

4. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, wherein: In S3, the captured image is binarized using MATLAB software to obtain a binary image.

5. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, characterized in that: In S4, the threshold condition is that the white ratio is ≤ 0.01%.

6. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, wherein: In S5, the second experimental group is placed at a feasible temperature, and the mass of the residue in the second experimental group is measured at intervals of a third preset time until the difference between two consecutive measured masses is less than 0.01 g.

7. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, wherein: In S5, a needle penetration test is conducted on the second experimental group placed at a feasible temperature, and three moments corresponding to the difference between the maximum and minimum needle penetration values ​​of three consecutive moments is less than 0.2 mm are screened out, and the middle moment among the three moments is taken as the performance stabilization time T2.

8. The method for determining the temperature and time for preparing the evaporation residue of thermosetting modified emulsified asphalt according to claim 1, wherein: The thermosetting modified emulsified asphalt adopts water-based epoxy modified emulsified asphalt.

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