MMA mortar for repairing pits in asphalt pavement of civil airport as well as preparation method and construction method of MMA mortar

Abstract

The invention discloses MMA (methyl methacrylate) mortar for repairing pits in asphalt pavement of civil airports. The MMA mortar is prepared from the following components in parts by weight: 100 parts of methyl methacrylate resin monomer, 0.60-0.66 part of initiator, 20-40 parts of plasticizer, 0.8-1.2 parts of accelerant, 500-1000 parts of fine aggregate and 25-50 parts of inorganic filler. The invention also discloses a preparation method of the MMA mortar for repairing the pit slot of the asphalt pavement of the civil airport and a construction method of the MMA mortar for repairing the pit slot of the asphalt pavement of the civil airport. The method can be used for repairing pit slots and crack diseases of the asphalt pavement under the condition of meeting the requirement of airport non-stop construction.

Description

Technical Field

[0001] The present invention relates to the technical field of airport pavement composite repair materials, and specifically to an MMA mortar for pothole repair of civil airport asphalt pavement and a preparation method thereof. Background Art

[0002] During the use of civil airport asphalt pavement, the pavement is affected by the combined action of natural factors and traffic loads for a long time, and diseases such as potholes, cracks, ruts, and loose spalling will occur. This not only affects the comfort of passengers, but also has the risk of the spalled aggregates being sucked into the aircraft engine, seriously affecting activities such as the safe takeoff, landing, and driving of the aircraft. Therefore, once potholes appear on the airport pavement, repair construction needs to be carried out immediately.

[0003] At present, pothole repair materials at home and abroad mainly focus on hot mix asphalt mixture, cold mix asphalt mixture, and polymer reaction type mixture. Hot mix asphalt mixture needs to maintain a temperature above 100 °C during transportation, paving, and compaction, and the construction has limitations in terms of climate and environment; although cold mix asphalt mixture can be constructed at a lower temperature, its strength formation depends on the volatilization of solvents or water in the asphalt binder, and it generally has the defect of low early strength.

[0004] Polymer reaction type mixture can make up for the inherent thermoplastic characteristics of asphalt binder, and has advantages such as good workability during construction at low temperature, fast curing speed, and high early strength, which is very suitable for the characteristics of non-stop operation construction of airport pavement. According to relevant literature research, polymer reaction type mixture can be roughly divided into epoxy resin type mixture, polyurethane type mixture, unsaturated polyester type mixture, and acrylate type mixture. The initial viscosity of methyl methacrylate (MMA) is controllable, and rapid curing can be achieved at low temperature. Its mortar has high early strength, and its fatigue resistance, impact resistance, and chemical corrosion resistance are all very excellent.

[0005] Therefore, an MMA mortar for pothole repair of civil airport asphalt pavement, a preparation method, and a construction method are provided. Summary of the Invention

[0006] The purpose of the present invention is to overcome the existing defects and provide an MMA mortar for pothole repair of civil airport asphalt pavement and a preparation method thereof, which can be used to repair potholes and crack diseases of asphalt pavement under the requirements of non-stop operation construction of the airport.

[0007] The technical solution to achieve the above purpose is:

[0008] An MMA mortar for pothole repair of civil airport asphalt pavement according to one of the present inventions is prepared from the following components by weight:

[0009] 100 parts of methyl methacrylate resin monomer, 0.60 - 0.66 parts of initiator, 20 - 40 parts of plasticizer, 0.8 - 1.2 parts of accelerator, 500 - 1000 parts of fine aggregate, 25 - 50 parts of inorganic filler.

[0010] Preferably, the initiator is any one of benzoyl peroxide, methyl ethyl ketone peroxide or tert-butyl peroxybenzoate.

[0011] Preferably, the plasticizer is any one of butyl methacrylate, dioctyl phthalate, dibutyl phthalate or diisodecyl phthalate.

[0012] Preferably, the accelerator is any one of N,N-dimethylaniline (DMA) or N,N-dimethyl-p-toluidine (DMPT).

[0013] Preferably, the fine aggregate is machine-made sand obtained by crushing basalt.

[0014] Preferably, the inorganic filler is mineral powder ground from limestone.

[0015] A preparation method of MMA mortar for pothole repair of civil airport asphalt pavement according to the second aspect of the present invention includes:

[0016] Step S1, loading the purified methyl methacrylate monomer, initiator and plasticizer into a three-necked flask respectively, and stirring and reacting under the condition of water bath heating at 75 - 90 °C. When the viscosity of the system reaches 20 - 40 mPa·s, stop heating and terminate the reaction to obtain a prepolymer;

[0017] Step S2, cooling the prepolymer in cold water. After cooling to a stable state, add the accelerator and stir until complete heat release and a certain viscosity are achieved, thus obtaining the MMA prepolymer binder;

[0018] Step S3, pouring the MMA prepolymer binder into a mixing pot previously filled with reasonably graded fine aggregate and inorganic filler, and manually stirring evenly with a mixing shovel to prepare the MMA mortar.

[0019] Preferably, in the step S1, before using the methyl methacrylate monomer, it is first pretreated under the condition of water bath at 20 - 80 °C, or washed with NaOH solution and distilled water to remove impurities;

[0020] In step S3, after the MMA mortar is stirred evenly, it is filled into the cement mortar test mold in two portions with a proper spoon. When filling the first layer, use a large spreader to vertically place it on the top of the test mold and spread the mortar evenly along the mold groove back and forth. After vibrating on the vibrating table 60 times, then fill the second layer. After spreading it evenly with a small spreader, vibrate it 60 times again. After the second vibration is completed, remove the mortar test mold, use a trowel to scrape off the excess mortar material on the surface and level it, and place it in a curing box at a certain temperature and humidity for curing for 3h, 1d, and 28d respectively. Demold to form test pieces and test the mechanical strength at different ages.

[0021] A construction method of MMA mortar for pothole repair of civil airport asphalt pavement according to the third aspect of the present invention includes:

[0022] Step T1, before construction, cut and excavate or mill along the pothole repair contour line to the non-seeping and stable part at the bottom of the pothole, and its depth is not less than the maximum depth of the pothole. When the pothole is relatively deep, excavate in layers according to the original asphalt surface layer, and form a stepped overlap between layers, and the overlap width is not less than 20 cm;

[0023] Step T2, clean the loose asphalt mixture in the pothole on the pavement to make the bottom flat and firm, the wall surface perpendicular to the pavement, and the bottom surface and wall surface of the pothole clean, completely dry, and without loose materials;

[0024] Step T3, spray and coat the bonding material on the bottom surface and wall surface of the pothole on the pavement, including but not limited to emulsified asphalt;

[0025] Step T4, use special equipment to heat and keep warm the MMA mortar, and fill the hot materials in layers according to the excavated layers, and level and compact layer by layer.

[0026] The beneficial effects of the present invention are as follows: In the methyl methacrylate monomer, various additives, fine aggregates, and inorganic filler modifiers are incorporated, and a polymethyl methacrylate mortar repair material is prepared through a polymerization reaction. Compared with other existing repair materials, the repair material of the present invention has the characteristics of good fluidity, can be cured at low temperature and has a short curing time, which very well meets the requirements of the non-stop maintenance construction of airport asphalt pavement. At the same time, the mechanical strength of this material is also relatively high, and it can reach a certain strength at an early stage, and its durability performance such as resistance to salt solution erosion, resistance to ultraviolet aging, and resistance to freeze-thaw cycle performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flowchart of a preparation method of MMA mortar for pothole repair of civil airport asphalt pavement according to the present invention;

[0028] Figure 2 is a flowchart of a construction method of MMA mortar for pothole repair of civil airport asphalt pavement according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] An MMA mortar for pothole repair of civil airport asphalt pavement, the MMA mortar is prepared from the following components by weight:

[0032] 100 parts of methyl methacrylate resin monomer, 0.60 - 0.66 parts of initiator, 20 - 40 parts of plasticizer, 0.8 - 1.2 parts of accelerator, 500 - 1000 parts of fine aggregate, 25 - 50 parts of inorganic filler.

[0033] In the embodiment, the initiator is any one of benzoyl peroxide, methyl ethyl ketone peroxide or tert-butyl peroxybenzoate.

[0034] In the embodiment, the plasticizer is any one of butyl methacrylate, dioctyl phthalate, dibutyl phthalate or diisodecyl phthalate.

[0035] In the embodiment, the accelerator is any one of N,N-dimethylaniline (DMA) or N,N-dimethyl-p-toluidine (DMPT).

[0036] In the embodiment, the fine aggregate is machine-made sand obtained by crushing basalt.

[0037] In the embodiment, the inorganic filler is mineral powder ground from limestone.

[0038] As Figure 1 shown, a preparation method of an MMA mortar for pothole repair of civil airport asphalt pavement includes:

[0039] Step S1, respectively load the purified methyl methacrylate monomer, initiator and plasticizer into a three-necked flask, and stir and react under the condition of water bath heating at 75 - 90 °C. When the viscosity of the system reaches 20 - 40 mPa·s, stop heating and terminate the reaction to obtain a prepolymer.

[0040] In the embodiment, before using methyl methacrylate monomer, it is first pre-treated under the condition of a water bath at 20 - 80 °C, or washed with NaOH solution and distilled water to remove impurities.

[0041] Step S2: Cool the prepolymer in cold water. After cooling to a stable state, add a promoter and stir until complete heat release and a certain viscosity are achieved, thus obtaining the MMA prepolymer binder.

[0042] Step S3: Pour the MMA prepolymer binder into a mixing pan that has been previously filled with reasonably graded fine aggregates and inorganic fillers, and manually stir evenly with a mixing shovel to prepare the MMA mortar.

[0043] In the embodiment, after the MMA mortar is stirred evenly, it is filled into the cement mortar test mold in two portions using an appropriate spoon. When filling the first layer, use a large spreading tool to vertically place it on top of the test mold and spread the mortar back and forth along the mold groove to level it. After starting the vibrating table and vibrating 60 times, then fill the second layer. After spreading it flat with a small spreading tool and vibrating 60 times again, after the second vibration is completed, remove the mortar test mold, use a trowel to scrape off the excess mortar material on the surface and level it, and place it in a curing box at a certain temperature and humidity for curing for 3h, 1d, and 28d respectively. Demold to form test pieces and test the mechanical strength at different ages.

[0044] As Figure 2 shown, a construction method of MMA mortar for pothole repair of civil airport asphalt pavement includes:

[0045] Step T1: Cut and excavate or mill along the pothole repair contour line during construction until reaching the non-seepage stable part at the bottom of the pothole, with a depth not less than the maximum depth of the pothole. When the pothole is relatively deep, excavate in layers according to the original asphalt surface layer, forming a stepped overlap between layers, with an overlap width not less than 20 cm;

[0046] Step T2: Clean the loose asphalt mixture in the pavement pothole to achieve a flat and solid bottom, with the wall surface perpendicular to the pavement, and the bottom and wall surfaces of the pothole being clean, completely dry, and free of loose materials;

[0047] Step T3: Spray and coat an adhesive material on the bottom and wall surfaces of the pavement pothole, including but not limited to emulsified asphalt;

[0048] Step T4: Use special equipment to heat and keep the MMA mortar warm, and fill in the hot materials in layers according to the excavated levels, and level and compact layer by layer.

[0049] In order to make the purpose and advantages of the present invention clearer and more understandable, the following specifically describes the present invention in combination with embodiments. It should be understood that the following text only describes one or several specific implementation manners of the present invention, and does not strictly limit the specific scope of protection claimed by the present invention.

[0050] Example 1

[0051] An MMA-based mortar repair material for pothole repair of civil airport asphalt pavements, which is prepared from the following components by weight: 100 parts of methyl methacrylate resin monomer, 0.60 part of initiator (benzoyl peroxide), 30 parts of plasticizer (butyl methacrylate), 0.80 part of accelerator (N,N-dimethyl-p-toluidine), 600 parts of fine aggregate (particle size 0.075 - 2.36 mm), and 30 parts of inorganic filler.

[0052] Preparation method of MMA-based mortar pothole repair material:

[0053] Stir and react the methyl methacrylate resin monomer, initiator and plasticizer at 80 °C for 27 min, measure the viscosity of the system to be 26.7 mPa·s, stop heating, terminate the reaction, and obtain a prepolymer;

[0054] Place the prepolymer in cold water for cooling. After cooling to a stable state, add the accelerator and stir until complete heat release and a certain viscosity are achieved, that is, an MMA prepolymer binder is obtained;

[0055] Pour the MMA prepolymer binder into a mixing pot that has been previously filled with reasonably graded fine aggregate and inorganic filler, and manually stir evenly with a mixing spatula;

[0056] After the MMA mortar is stirred evenly, it is filled into a cement mortar test mold in two portions with an appropriate spoon. When filling the first layer, use a large spreading tool to vertically place it on top of the test mold and spread the mortar back and forth along the mold groove. After vibrating 60 times on a vibrating table, then fill the second layer. After spreading it flat with a small spreading tool and vibrating 60 times again, after the second vibration is completed, remove the mortar test mold, and use a trowel to scrape off the excess mortar material on the surface and level it;

[0057] Place it in a curing box at a certain temperature and humidity for curing for 3 h, 1 d, and 28 d respectively, demold to form specimens and test their fluidity, mechanical strength, and volume shrinkage rate at different ages.

[0058] Example 2

[0059] An MMA-based mortar repair material for pothole repair of civil airport asphalt pavements, which is prepared from the following components by weight: 100 parts of methyl methacrylate resin monomer, 0.60 part of initiator (benzoyl peroxide), 30 parts of plasticizer (butyl methacrylate), 0.80 part of accelerator (N,N-dimethyl-p-toluidine), 500 parts of fine aggregate (particle size 0.075 - 2.36 mm), and 30 parts of inorganic filler.

[0060] Preparation method of MMA-based mortar pothole repair material:

[0061] The methyl methacrylate resin monomer, initiator, and plasticizer were stirred and reacted at 80 °C for 30 min. The viscosity of the system was measured to be 32.5 mPa·s. Heating was stopped to terminate the reaction, and a prepolymer was obtained.

[0062] The prepolymer was placed in cold water for cooling. After cooling to a stable state, a promoter was added and stirred until complete exotherm and a certain viscosity were achieved, obtaining the MMA prepolymer binder.

[0063] The MMA prepolymer binder was poured into a mixing pan that had been pre-filled with well-graded fine aggregate and inorganic filler, and manually stirred evenly with a mixing spatula.

[0064] After the MMA mortar was stirred evenly, it was filled into the cement mortar test mold in two portions using an appropriate spoon. When filling the first layer, a large spreading tool was vertically placed on top of the test mold and the mortar was spread evenly along the mold groove back and forth. After vibrating 60 times on a vibrating table, the second layer was filled. After spreading evenly with a small spreading tool, it was vibrated 60 times again. After the second vibration was completed, the mortar test mold was removed, and the excess mortar material on the surface was scraped off and leveled with a trowel.

[0065] It was placed in a curing box at a certain temperature and humidity for curing for 3 h, 1 d, and 28 d respectively. Demolding was carried out to form specimens and test their fluidity, mechanical strength, and volume shrinkage rate at different ages.

[0066] Example 3

[0067] An MMA-based mortar repair material for pothole repair of civil airport asphalt pavements, which is prepared from the following components by weight: 100 parts of methyl methacrylate resin monomer, 0.60 parts of initiator (benzoyl peroxide), 30 parts of plasticizer (butyl methacrylate), 0.80 parts of promoter (N,N-dimethyl-p-toluidine), 700 parts of fine aggregate (particle size 0.075 - 2.36 mm), and 30 parts of inorganic filler.

[0068] Preparation method of the MMA-based mortar pothole repair material:

[0069] The methyl methacrylate resin monomer, initiator, and plasticizer were stirred and reacted at 80 °C for 33 min. The viscosity of the system was measured to be 38.2 mPa·s. Heating was stopped to terminate the reaction, and a prepolymer was obtained.

[0070] The prepolymer was placed in cold water for cooling. After cooling to a stable state, a promoter was added and stirred until complete exotherm and a certain viscosity were achieved, obtaining the MMA prepolymer binder.

[0071] The MMA prepolymer binder was poured into a mixing pan that had been pre-filled with well-graded fine aggregate and inorganic filler, and manually stirred evenly with a mixing spatula.

[0072] After the MMA mortar is stirred evenly, it is filled into the cement mortar test mold in two portions with a suitable spoon. When filling the first layer, use a large spreading tool to vertically place it on top of the test mold and spread the mortar back and forth along the mold groove. After vibrating on the vibrating table 60 times, then fill the second layer. After spreading it flat with a small spreading tool, vibrate it 60 times again. After the second vibration is completed, remove the mortar test mold, and use a trowel to scrape off the excess mortar material on the surface and level it;

[0073] Place it in a curing box with a certain temperature and humidity for curing for 3h, 1d, and 28d respectively. Demold to form test pieces and test their fluidity, mechanical strength, and volume shrinkage rate at different ages.

[0074] Performance Test

[0075] 1. Fluidity Test

[0076] Use a cement mortar fluidity tester to test the fluidity change of the MMA-based mortar in Examples 1-3 with the MMA mortar stirred evenly manually over the curing time. The results are shown in Table 1:

[0077] Curing time / min 10 15 20 22 24 26 28 30 31 32 Flowability (Example 1) / mm 355 323 289 258 234 216 199 181 162 147 Flowability (Example 2) / mm 334 310 277 244 222 209 183 174 155 132 Flowability (Example 3) / mm 322 304 272 231 208 189 173 164 147 127

[0078] Table 1

[0079] It can be seen from Table 1 that the MMA-based mortar repair material of the present invention can control its fluidity by adjusting the material composition and synthesis conditions. In actual repair projects, it is generally required that the fluidity of the repair material is greater than 180mm for easy construction. Then the initial setting time is 26min, and the final setting time is greater than 32min. Therefore, for the construction process, it is necessary to complete the construction within 26min after adding the curing agent, and the curing can be achieved quickly after the construction is completed.

[0080] 2. Mechanical Strength (Compressive and Flexural Strength) Test

[0081] Use a flexural testing machine to test the flexural strength of the MMA mortar test pieces cured at different ages for the prismatic test pieces with a cross-sectional size of 40mm×40mm×160mm, and determine the flexural strength by the center loading method. When the test piece is placed in the lever-type flexural testing machine for testing, the lever should be in a horizontal state. After the test piece is placed, adjust the fixture so that the lever is as close to the horizontal position as possible when the test piece breaks.

[0082] The loading speed of the flexural test is 50N / s±10N / s until it breaks, and keep the two half prisms in a moist state until the compressive test is carried out. The flexural strength of the MMA mortar test piece is calculated according to the following formula:

[0083]

[0084] Where: Rf is the flexural strength (MPa), Ff is the failure load (N), L is the center distance between the support cylinders (mm), b is the side length of the square cross-section of the specimen, which is 40 mm.

[0085] Take the arithmetic mean of the flexural strength test values of three specimens, and the result shall be accurate to 0.1 MPa. When one of the three strength values exceeds the average value by ±10%, it shall be excluded and then averaged, and the average value shall be used as the flexural strength test result.

[0086] The two broken blocks after the flexural test shall be immediately subjected to the compressive test. The compressive test shall be carried out with a compressive fixture. The compressed surface of the specimen is the two side surfaces during specimen molding, and the area is 40 mm × 40 mm. Before the test, the sand grains or sundries between the compressed surface of the specimen and the pressure plate shall be removed. During the test, the side surface of the specimen shall be used as the compressed surface, the bottom surface of the specimen shall be closely attached to the positioning pin of the fixture, and the fixture shall be aligned with the center of the pressure plate of the press.

[0087] The loading speed of the press shall be controlled within the range of 2400 N / s ± 200 N / s, and it shall be more strictly controlled when approaching failure. The compressive strength of the MMA mortar specimen is calculated according to the following formula:

[0088]

[0089] Where: Rc is the compressive strength (MPa), Fc is the failure load (N), A is the compressed area (mm2) (40 mm × 40 mm).

[0090] Take the arithmetic mean of the six compressive strength test values, and the result shall be accurate to 0.1 MPa. If one of the six strength values exceeds the average value by ±10%, it shall be excluded and then averaged with the remaining five results. If one of the five values exceeds the average value by ±10% again, then this group of specimens shall be invalid.

[0091] 3. Volume shrinkage rate test

[0092] Prepare a test mold with dimensions of 25 mm × 25 mm × 280 mm. Pour the prepared MMA mortar into the test mold with nail heads at both ends in two layers. After the first layer of MMA mortar is poured into the test mold, use a small knife to compact it back and forth, especially on both sides of the nail heads. If necessary, it can be compacted several more times. Then use a scraping board to scrape off the MMA mortar that is more than 3 / 4 of the height of the test mold. Then use a 23 mm × 23 mm square tamping rod to vibrate from the inside of the nail head and place it in the curing box for curing.

[0093] Starting from the time when the specimen is placed in the box, take it out and measure the length at 4 d, 11 d, 18 d, and 25 d (that is, at 7 d, 14 d, 21 d, and 28 d from the time of molding).

[0094] The measurement of the specimen length shall be carried out in a laboratory at 20℃±3℃, and the comparator can be used only after the temperature in the laboratory has reached a constant value.

[0095] The volume shrinkage rate of MMA mortar specimens at each age shall be calculated according to the following formula:

[0096]

[0097] In the formula: St is the volume shrinkage rate (%) of the MMA mortar specimen at age t, L 0 is the initial measurement reading (mm), Lr is the measurement reading at a certain age (mm), and 250 is the effective length of the specimen (mm).

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An MMA mortar for repairing potholes on asphalt pavement at civil airports, characterized in that: MMA mortar is prepared from the following components by weight: 100 parts of methyl methacrylate resin monomer, 0.60-0.66 parts of initiator, 20-40 parts of plasticizer, 0.8-1.2 parts of accelerator, 500-1000 parts of fine aggregate, and 25-50 parts of inorganic filler.

2. The MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 1 is characterized in that: The initiator is any one of benzoyl peroxide, methyl ethyl ketone peroxide or tert-butyl perbenzoate.

3. The MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 1 is characterized in that: The plasticizer is any one of butyl methacrylate, dioctyl phthalate, dibutyl phthalate or diisodecyl phthalate.

4. The MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 1, characterized in that: The accelerator is any one of N,N-dimethylaniline (DMA) and N,N-dimethyl-p-toluidine (DMPT).

5. The MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 1 is characterized in that: The fine aggregate is machine-made sand obtained by crushing basalt.

6. The MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 1, characterized in that: The inorganic filler is limestone ground into mineral powder.

7. A method for preparing MMA mortar for repairing potholes on asphalt pavement of civil airports, characterized in that: include: Step S1, respectively putting the purified methyl methacrylate monomer, initiator and plasticizer into a three-necked flask, and stirring and reacting them in a water bath at 75-90° C., and stopping heating and terminating the reaction when the viscosity of the system reaches 20-40 mPa·s to obtain a prepolymer; Step S2, placing the prepolymer in cold water to cool, adding a promoter and stirring until the prepolymer is cooled to a stable state until it is completely exothermic and has a certain viscosity, thereby obtaining an MMA prepolymer binder; Step S3, pouring the MMA prepolymer binder into a stirring pot that has been pre-filled with fine aggregates of reasonable grade and inorganic fillers, and manually stirring it evenly with a stirring spatula to obtain MMA mortar.

8. The method for preparing MMA mortar for repairing potholes on asphalt pavement of civil airports according to claim 7, characterized in that: In the step S1, before using the methyl methacrylate monomer, it is first pretreated in a water bath at 20-80° C., or washed with a NaOH solution and distilled water to remove impurities; In step S3, after the MMA mortar is evenly stirred, it is loaded into the cement mortar test mold twice with an appropriate spoon. When loading the first layer, a large feeder is vertically placed on the top of the test mold to spread the mortar back and forth along the mold groove. After starting the vibration table to vibrate 60 times, the second layer is loaded, and the mortar is spread and vibrated again 60 times after being leveled with a small feeder. After the second vibration is completed, the mortar test mold is removed, and the excess mortar material on the surface is scraped off and smoothed with a spatula, and then placed in a curing box with a certain temperature and humidity for curing for 3h, 1d and 28d respectively, and demolded to form test pieces and test the mechanical strength at different ages.

9. A construction method of MMA mortar for repairing potholes on asphalt pavement of civil airports, characterized in that: include: Step T1: Cut or mill along the contour line of the pit repair to a watertight and stable place at the bottom of the pit at a depth not less than the maximum depth of the pit. When the pit is deep, excavate in layers according to the original asphalt surface layer, and form a stepped overlap between the layers with an overlap width of not less than 20 cm; Step T2, clean up the loose asphalt mixture in the road surface potholes, so that the bottom is flat and solid, the wall is perpendicular to the road surface, and the bottom and wall of the potholes are clean, completely dry, and free of loose materials; Step T3, spraying and coating the bottom and wall of the road surface pothole with bonding materials, including but not limited to emulsified asphalt; Step T4, using special equipment to heat and insulate the MMA mortar, and filling the hot material in layers according to the excavated layers, and leveling and compacting them layer by layer.

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