Anti-heavy-load asphalt pavement modifier, preparation method and application

Abstract

The application discloses an anti-heavy-load asphalt pavement modifier, a preparation method and application thereof, and comprises the following raw materials in parts by weight: 100 parts of polyamide recycled material, 5-25 parts of glycidyl methacrylate copolymer compatilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid absorbent, and 0.1-2 parts of antioxidant. The anti-heavy-load asphalt pavement modifier has super high strength and toughness, and when added into asphalt mixture, can not only greatly improve the shearing strength of the asphalt mixture at high temperature, but also can obviously improve the water damage resistance and fatigue resistance of the asphalt mixture, and has important significance for asphalt pavement disease prevention and treatment and treatment under high temperature and extreme load environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt modifier, in particular to an anti-heavy-load asphalt pavement modifier, a preparation method and application. BACKGROUND

[0002] In recent years, through the large-scale promotion and application of SBS modified asphalt and anti-rutting materials, the rutting disease of ordinary asphalt pavement has been basically controlled. However, with the rapid development of economic society, the traffic flow of part of the trunk highway is too concentrated, and the highway transportation vehicles are developing towards large-scale, towing and containerization. The early damage phenomenon dominated by asphalt pavement rutting deformation and fatigue cracking is still prominent in local areas.

[0003] The generation of pavement diseases will significantly affect the service performance of the pavement. The excessive deformation of the road surface will affect the flatness of the pavement, cause the loss of control of the vehicle when overtaking or changing lanes, affect the steering stability of the vehicle, and also cause poor drainage of the road surface in rainy days, thereby reducing the anti-skid performance of the pavement. Even the vehicle may slip or ice due to the water accumulation in the rut, which affects the safety of high-speed driving. The pavement cracking will cause the rainwater to enter the pavement base, and under the rolling of the vehicle, the dynamic water scouring damage to the base will be caused, thereby inducing other diseases such as potholes and pumping, and affecting the service life of the pavement.

[0004] In view of the disease problems of asphalt pavement under heavy-load traffic environment, high modulus asphalt, high content anti-rutting agent and other high-performance materials are currently used, but the rutting disease of the pavement has not been completely treated. In some areas, technical solutions such as epoxy asphalt and semi-flexible grouting pavement are also tried, but the problems such as complex construction process, insufficient mechanization, long closed traffic time, high engineering cost and the like limit the large-scale promotion and application thereof. Moreover, due to the excessive rigidity of the above-mentioned materials, the cracking phenomenon often occurs soon after the pavement is opened to traffic, which affects the service performance of the pavement.

[0005] Therefore, at present, it is urgent to provide a comprehensive solution capable of enabling the asphalt pavement to have high-temperature anti-rutting and low-temperature anti-cracking performance under heavy-load traffic environment, so as to meet the specific needs of green traffic and safe traffic under the new situation. SUMMARY

[0006] The present application relates to the technical field of asphalt modifier, in particular to an anti-heavy-load asphalt pavement modifier, a preparation method and application.

[0007] In a first aspect, the application provides an anti-heavy-load asphalt pavement modifier, which comprises the following raw materials in parts by weight: 100 parts of polyamide recycled material, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid absorbent, and 0.1-2 parts of antioxidant.

[0008] In a second aspect, the application provides a preparation method of the anti-heavy-load asphalt pavement modifier, which comprises the following steps.

[0009] The raw materials are weighed, which comprise the following raw materials in parts by weight: 100 parts of polyamide recycled material, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid absorbent, and 0.1-2 parts of antioxidant.

[0010] The raw materials are mixed uniformly to obtain a mixture;

[0011] The mixture is melt-mixed and then extruded and granulated, and is cooled and dried to obtain the anti-heavy-load asphalt pavement modifier.

[0012] In a third aspect, the application provides the anti-heavy-load asphalt pavement modifier according to the first aspect in the application in the asphalt and asphalt mixture.

[0013] Therefore, the anti-heavy-load asphalt pavement modifier according to the application has super-high strength and toughness, and when added into the asphalt mixture, can greatly improve the shear strength of the asphalt mixture at high temperature, and can obviously improve the water damage resistance and fatigue resistance of the asphalt mixture, and has important significance for the prevention and treatment of the asphalt pavement diseases under high temperature and extreme load environment. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative labor based on these drawings.

[0015] Figure 1 is a flow chart of the preparation method of the anti-heavy-load asphalt pavement modifier according to the embodiments of the application;

[0016] Figure 2 is a schematic diagram of the mineral aggregate grading curve according to the embodiments of the application. DETAILED DESCRIPTION

[0017] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in order to make the technical solutions in the embodiments of the present application apparent to those skilled in the art. Obviously, the described embodiments are only a part but not all of the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts should fall into the scope of the present application.

[0018] The present application discloses a heavy load resistant asphalt pavement modifier. The asphalt modifier comprises raw materials in the following weight proportions: 100 parts of polyamide recycled material, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid absorbent, and 0.1-2 parts of antioxidant.

[0019] Preferably, the asphalt modifier comprises raw materials in the following weight proportions: 100 parts of polyamide recycled material, 5-20 parts of glycidyl methacrylate copolymer compatibilizer, 5-15 parts of waste tire rubber powder, 2-5 parts of lubricant, 1-3 parts of silane coupling agent, 2-3 parts of acid absorbent, and 0.1-1 parts of antioxidant.

[0020] Preferably, the weight proportion of the glycidyl methacrylate copolymer compatibilizer is 5, 12, 15, 18, 20, 25, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0021] Preferably, the weight proportion of the waste tire rubber powder is 5, 8, 10, 12, 15, 20, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0022] Preferably, the weight proportion of the lubricant is 1, 2, 3, 5, 8, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0023] Preferably, the weight proportion of the silane coupling agent is 1, 2, 2.5, 3, 5, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0024] Preferably, the weight proportion of the acid absorbent is 2, 3, 5, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0025] Preferably, the weight proportion of the antioxidant is 0.1, 0.5, 1, or a range with any of the foregoing weight proportions as the upper and lower limits.

[0026] Preferably, the total mass proportion of the glycidyl methacrylate copolymer compatibilizer and the waste tire rubber powder is 20-30%, and the mass ratio of the glycidyl methacrylate copolymer compatibilizer, the waste tire rubber powder, and the silane coupling agent is 3:2:0.5.

[0027] Specifically, the polyamide recycled material includes polyamide 6 recycled material and polyamide 12 recycled material in a weight ratio of 1:3-4.

[0028] The polyamide 6 recycled material, as an engineering plastic, has high tensile strength, thermal stability, wear resistance, etc., but the toughness is relatively poor; the polyamide 12 recycled material has more outstanding effects in chemical resistance, impact toughness, and processing performance, etc.; after the two are mixed according to the above weight ratio, the asphalt mixture is modified, and a more balanced modified effect of road performance can be obtained.

[0029] Specifically, the glycidyl methacrylate copolymer compatibilizer includes at least one of ethylene-glycidyl methacrylate copolymer and styrene-glycidyl methacrylate copolymer, and the glycidyl methacrylate copolymer compatibilizer contains 5-10% of glycidyl methacrylate by mass percentage.

[0030] The blending system of polyamide and asphalt is a thermodynamically unstable system, so improving the compatibility through reactive compatibilization technology is one of the most effective means; the glycidyl methacrylate copolymer contains a large number of epoxy groups, which on the one hand chemically reacts with polyamide during melt extrusion, and on the other hand chemically reacts with hydroxyl, carboxyl in asphalt and hydroxyl on the surface of stone, etc., thereby forming a stable, three-dimensional network structure of the compatible mixed system, so that the asphalt mixture can exhibit excellent high and low temperature road performance.

[0031] Specifically, the lubricant includes at least one of ethylene bis-stearamide, oxidized polyethylene wax, pentaerythritol stearate, and montan wax.

[0032] Specifically, the silane coupling agent includes at least one of 3-ureidopropyl trimethoxysilane, γ-mercaptopropyl triethoxysilane (KH-580), and bis(3-tri-ethoxysilylpropyl) tetrasulfide (Si69).

[0033] Specifically, the acid absorbent includes at least one of magnesium oxide, calcium hydroxide, and 12-alkyl benzene sulfonic acid sodium.

[0034] Specifically, the antioxidant includes at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine (1098), tris(2,4-di-tert-butyl) phenyl phosphite (168), and dilauryl thiodipropionate.

[0035] Specifically, the waste tire rubber powder has a mesh size of 80-200 mesh. Below 80 mesh, the particles are too large to be uniformly mixed and dispersed, thereby affecting the performance; above 200 mesh, dust is generated, so the mesh size is determined to be 80-200 mesh.

[0036] The system adds the waste tire rubber powder treated by the silane coupling agent, and on the basis of ensuring the interface compatibility of the system, the crack resistance of the asphalt mixture can be further improved, and the temperature fatigue and load fatigue failure ability of the asphalt mixture under low temperature environment and large traffic volume can be further improved.

[0037] In addition, the embodiment of the present application also discloses a preparation method of the heavy-load-resistant asphalt pavement modifier. Figure 1 As shown in the figure, the method comprises the following steps:

[0038] Step S101: The raw materials including the following weight proportions are weighed: 100 parts of polyamide recycled material, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid absorbent, and 0.1-2 parts of antioxidant.

[0039] Step S102: The raw materials are uniformly mixed to obtain a mixture.

[0040] Specifically, the mixing temperature is 60-100 DEG C.

[0041] Step S103: After the mixture is melt-mixed and extruded and granulated, the heavy-load-resistant asphalt pavement modifier is obtained through cooling and drying.

[0042] Specifically, the melt-mixing is performed by using a double-screw extruder, and the reaction extrusion is performed by using a melt booster pump. The barrel temperature of the double-screw extruder is 220 DEG C.-260 DEG C., the pressure difference between the inlet and outlet of the melt booster pump is controlled to be 3-20 MPa, and the screw rotation speed of the double-screw extruder is 100-250 r / min.

[0043] Since the polyamide needs a high temperature to be extruded and granulated, and the recycled material and the waste tire rubber powder contain certain impurities, the extrusion molding is difficult. If the blend stays in the double-screw extruder for too long, the material is prone to degradation, and the mechanical properties are weakened; and if the stay time is too short, the reaction process of the compatibilizer is insufficient, and the toughness of the material cannot be fully improved. Therefore, the embodiment of the present application solves the above problems by controlling the extrusion temperature, the pressure difference between the inlet and outlet of the melt booster pump, and the screw rotation speed of the extruder, so as to ensure the quality stability of the modifier.

[0044] The single-particle mass of the modifier obtained through the extrusion and granulation is 0.05-5 mg.

[0045] The above preparation method is simple, the material and production cost are controllable, and the production and application are facilitated.

[0046] In addition, the embodiment of the present application also discloses the application of the heavy-load-resistant asphalt pavement modifier in the asphalt mixture.

[0047] Specifically, the heavy-duty asphalt pavement modifier and aggregate are put into a mixing pot at 180°C and dry-mixed evenly. Then, the base asphalt is added and mixed evenly, and finally, mineral powder is added and mixed evenly to obtain the heavy-duty asphalt mixture.

[0048] Specifically, the dry mixing and blending times are both 90 seconds. The mass ratio of the heavy-duty asphalt pavement modifier to the aggregate can be 1:200.

[0049] Specifically, 70# base asphalt can be used. The mass percentage of the heavy-duty asphalt pavement modifier in the asphalt mixture is 0.2% to 0.6%.

[0050] Asphalt content is one of the most important technical indicators of asphalt mixtures. Excessive asphalt content leads to poor high-temperature stability, making the pavement prone to bleeding, rutting, and shoving. Conversely, insufficient asphalt content reduces fatigue resistance, causing pavement cracking. As mentioned earlier, the embodiment of this invention proposes an anti-heavy-load asphalt pavement modifier with a single particle mass of only 0.05–1 mg. The smaller the particle size of the modifier, the larger its specific surface area, enabling it to adsorb more asphalt without bleeding. Compared to conventional asphalt mixtures, the asphalt content of the mixture with the anti-heavy-load asphalt pavement modifier is 0.3–0.6% higher. Therefore, while ensuring the high-temperature performance of the asphalt mixture, it also takes into account low-temperature crack resistance and fatigue resistance.

[0051] The invention's technical solution will be further described below with specific embodiments.

[0052] Example 1

[0053] The heavy-load asphalt pavement modifier of Example 1 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 5 parts of ethylene-glycidyl methacrylate copolymer compatibilizer, 10 parts of waste tire rubber powder, 2 parts of oxidized polyethylene wax, 2 parts of 3-ureapropyltrimethoxysilane coupling agent, 3 parts of sodium 12-alkylbenzenesulfonate acid absorber, and 0.5 parts of 1098 antioxidant.

[0054] The raw materials were mixed evenly at 60℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 250℃ and the screw speed was 250 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 5 mg.

[0055] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 528g of 70# base asphalt was added and mixed for 90 seconds. Then, mineral powder was added and mixed for 90 seconds to obtain heavy-load resistant asphalt mixture.

[0056] Example 2

[0057] The heavy-load asphalt pavement modifier of Example 2 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 5 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 15 parts of waste tire rubber powder, 5 parts of ethylene bis-stearamide, 2 parts of 3-ureapropyltrimethoxysilane coupling agent, 3 parts of sodium 12-alkylbenzenesulfonate acid absorber, and 0.5 parts of 1098 antioxidant.

[0058] The raw materials were mixed evenly at 60℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 260℃ and the screw speed was 250 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 1 mg.

[0059] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 528g of 70# base asphalt was added and mixed for 90 seconds. Then, mineral powder was added and mixed for 90 seconds to obtain heavy-load resistant asphalt mixture.

[0060] Example 3

[0061] The heavy-load asphalt pavement modifier of Example 3 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 12 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 8 parts of waste tire rubber powder, 3 parts of ethylene bis-stearamide, 2 parts of 3-ureapropyltrimethoxysilane coupling agent, 2 parts of magnesium oxide acid absorber, and 0.1 parts of 168 antioxidant.

[0062] The raw materials were mixed evenly at 80℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 250℃ and the screw speed was 200 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.5 mg.

[0063] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 540g of 70# base asphalt was added and mixed for 90 seconds. Then mineral powder was added and mixed for 90 seconds to obtain heavy-load resistant asphalt mixture.

[0064] Example 4

[0065] The heavy-load asphalt pavement modifier of Example 4 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 15 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 10 parts of waste tire rubber powder, 2 parts of pentaerythritol stearate, 2.5 parts of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 2 parts of magnesium oxide acid absorber, and 1 part of 168 antioxidant.

[0066] The raw materials were mixed evenly at 80℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 250℃ and the screw speed was 150 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.1 mg.

[0067] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 564g of 70# base asphalt was added and mixed for 90 seconds. Then, mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0068] Example 5

[0069] The heavy-load asphalt pavement modifier of Example 5 was prepared using raw materials comprising the following parts by weight: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 15 parts of ethylene-glycidyl methacrylate copolymer compatibilizer, 10 parts of waste tire rubber powder, 3 parts of pentaerythritol stearate, 2.5 parts of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 2 parts of magnesium oxide acid absorber, and 0.5 parts of 168 antioxidant.

[0070] The raw materials were mixed evenly at 80℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 250℃ and the screw speed was 150 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.1 mg.

[0071] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows:Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 564g of 70# base asphalt was added and mixed for 90 seconds. Then, mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0072] Example 6

[0073] The heavy-load asphalt pavement modifier of Example 6 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 18 parts of ethylene-glycidyl methacrylate copolymer compatibilizer, 12 parts of waste tire rubber powder, 3 parts of pentaerythritol stearate, 3 parts of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 3 parts of magnesium oxide acid absorber, and 0.5 parts of 168 antioxidant.

[0074] The raw materials were mixed evenly at 80℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 260℃ and the screw speed was 100 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.05 mg.

[0075] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 576g of 70# base asphalt was added and mixed for 90 seconds. Then mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0076] Example 7

[0077] The heavy-load asphalt pavement modifier of Example 7 was prepared using raw materials in the following weight parts: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 20 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 5 parts of waste tire rubber powder, 3 parts of lignite wax, 1 part of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 2 parts of calcium hydroxide acid absorbent, and 1 part of dilauryl thiodipropionate antioxidant.

[0078] The raw materials were mixed evenly at 100℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 220℃ and the screw speed was 100 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.05 mg.

[0079] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 576g of 70# base asphalt was added and mixed for 90 seconds. Then mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0080] Example 8

[0081] The heavy-load asphalt pavement modifier of Example 8 was prepared using raw materials comprising the following parts by weight: 25 parts of recycled polyamide 6, 75 parts of recycled polyamide 12, 20 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 15 parts of waste tire rubber powder, 3 parts of lignite wax, 3 parts of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 2 parts of calcium hydroxide acid absorbent, and 0.5 parts of dilauryl thiodipropionate antioxidant.

[0082] The raw materials were mixed evenly at 100℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 260℃ and the screw speed was 100 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.05 mg.

[0083] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 576g of 70# base asphalt was added and mixed for 90 seconds. Then mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0084] Example 9

[0085] The heavy-load asphalt pavement modifier of Example 9 was prepared using raw materials in the following weight parts: 20 parts of recycled polyamide 6, 80 parts of recycled polyamide 12, 15 parts of styrene-glycidyl methacrylate copolymer compatibilizer, 10 parts of waste tire rubber powder, 2 parts of pentaerythritol stearate, 2.5 parts of bis(3-tri-ethoxysilylpropyl)tetrasulfide silane coupling agent, 2 parts of magnesium oxide acid absorber, and 1 part of 168 antioxidant.

[0086] The raw materials were mixed evenly at 80℃ to obtain a mixture; the mixture was melt-blended using a twin-screw extruder and then reacted and extruded using a melt booster pump. The barrel temperature of the twin-screw extruder was 250℃ and the screw speed was 150 r / min. After cutting, cooling and drying, the modifier material was obtained with a single particle mass of 0.1 mg.

[0087] Asphalt mixtures were prepared in the laboratory using the aforementioned heavy-load asphalt pavement modifier, and the aggregate gradation curves used are as follows: Figure 2 As shown. 60g of the above modifier and 12000g of aggregate were put into a mixing pot at 180℃ and dry-mixed for 90 seconds. 564g of 70# base asphalt was added and mixed for 90 seconds. Then, mineral powder was added and mixed for 90 seconds to obtain heavy-duty asphalt mixture.

[0088] Comparative Example 1

[0089] The difference between Comparative Example 1 and the above examples is that no modifier is added when preparing the asphalt mixture in the laboratory, and the amount of 70# base asphalt is 504g.

[0090] Comparative Example 2

[0091] The difference between Comparative Example 2 and Comparative Example 1 is that when preparing asphalt mixtures in the laboratory, the 70# base asphalt was replaced with SBS modified asphalt.

[0092] Comparative Example 3

[0093] The difference between Comparative Example 3 and Example 1 is that the modifier consists only of a mixture of recycled polyamide 6 and recycled polyamide 12 (mass ratio of 1:3), and the amount of 70# base asphalt used is 504g.

[0094] Comparative Example 4

[0095] The difference between Comparative Example 4 and Example 3 is that the modifier only contains recycled linear high-density polyethylene.

[0096] According to the test methods in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011)," the asphalt mixtures prepared above were subjected to relevant performance tests. Marshall stability and dynamic stability at 70℃ and 1MPa were used to evaluate the high-temperature deformation resistance of the asphalt mixture under high temperature and heavy load conditions. The -10℃ low-temperature flexural failure strain was used to evaluate the crack resistance of the asphalt mixture under low-temperature conditions. Finally, the freeze-thaw splitting strength ratio was used to evaluate the water damage resistance of the asphalt mixture. The test results are shown in Table 1.

[0097] Table 1 Performance of Examples and Comparative Examples

[0098]

[0099] The test results of Examples 1-9 and Comparative Examples 1-4 show that the heavy-load resistant asphalt mixtures prepared by Examples 1-9 have good road performance in terms of high-temperature deformation resistance, low-temperature crack resistance and water damage resistance, indicating that the heavy-load resistant asphalt pavement modifier and its preparation method of the present invention have good implementation effect.

[0100] According to Examples 1-9, it was found that the content of glycidyl methacrylate copolymer compatibilizer has a significant impact on the high-temperature deformation resistance and water damage resistance of asphalt mixtures, and the relationship is almost positively correlated. This is mainly due to the large number of epoxy groups in the glycidyl methacrylate copolymer. The epoxy groups react chemically with the active groups of the polyamide matrix, asphalt, and aggregate, which greatly improves the mechanical properties of the asphalt mixture and enhances the interfacial adhesion between asphalt and aggregate.

[0101] Examples 3-6 and Example 9 also show that the ratio of glycidyl methacrylate copolymer compatibilizer, waste tire rubber powder and silane coupling agent has a certain correlation with the low temperature toughness of asphalt mixture. When the sum of the two is 20-30% and the mass ratio of the three is 3:2:0.5, the low temperature toughness of asphalt mixture reaches the optimum.

[0102] The results of bending failure strain at -10°C in Examples 1-9 show that more compatibilizer is not necessarily better. As the amount of compatibilizer increases, the bending failure strain at -10°C reaches its maximum value and then decreases. This may be because excessive compatibilizer causes unreacted epoxy groups to damage the structure of the mixed system, leading to a decrease in the bending failure strain at -10°C. However, it has no significant impact on other road performance characteristics, indicating that the interactions between the components in the system of this invention are relatively complex.

[0103] Further comparison revealed that the molding process of the heavy-load asphalt modifiers prepared in Examples 1-9 also affected the performance of the mixture. The slower the screw speed of the extruder and the smaller the particle size of the modifier, the greater the optimal asphalt-aggregate ratio of the asphalt mixture and the better its low-temperature toughness.

[0104] In summary, the heavy-load asphalt pavement modifier of this invention has extremely high strength and toughness. When added to asphalt mixtures, it not only significantly improves the shear strength of asphalt mixtures at high temperatures, but also significantly improves the water damage resistance and fatigue resistance of asphalt mixtures. It is of great significance for the prevention and treatment of asphalt pavement diseases under high temperature and extreme load environments.

[0105] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heavy-load asphalt pavement modifier, characterized in that, The raw materials include the following parts by weight: 100 parts of recycled polyamide, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid scavenger, and 0.1-2 parts of antioxidant. The raw materials are mixed evenly to obtain a mixture, wherein the mixing temperature is 60~100℃; The mixture is melted and kneaded, then extruded and granulated. After cooling and drying, a heavy-duty asphalt pavement modifier is obtained. The mixture is melt-kneaded using a twin-screw extruder and reacted extruded using a melt booster pump. The barrel temperature of the twin-screw extruder is 220℃~260℃, the pressure difference between the inlet and outlet of the melt booster pump is controlled at 3~20MPa, and the screw speed of the twin-screw extruder is 100~250r / min.

2. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, It includes the following raw materials in parts by weight: 100 parts of recycled polyamide, 5-20 parts of glycidyl methacrylate copolymer compatibilizer, 5-15 parts of waste tire rubber powder, 2-5 parts of lubricant, 1-3 parts of silane coupling agent, 2-3 parts of acid absorber, and 0.1-1 parts of antioxidant.

3. The heavy-load asphalt pavement modifier according to claim 1, characterized in that: The polyamide recycled material includes: polyamide 6 recycled material and polyamide 12 recycled material in a weight ratio of 1:3~4.

4. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, The glycidyl methacrylate copolymer compatibilizer includes at least one of the following: ethylene-glycidyl methacrylate copolymer and styrene-glycidyl methacrylate copolymer, and the glycidyl methacrylate copolymer compatibilizer contains 5-10% glycidyl methacrylate by mass.

5. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, The lubricant includes at least one of the following: ethylene bis-stearamide, oxidized polyethylene wax, pentaerythritol stearate, and lignite wax.

6. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, The silane coupling agent includes at least one of the following: 3-ureapropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, and bis(3-tri-ethoxysilylpropyl)tetrasulfide.

7. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, The acid absorbent includes at least one of the following: magnesium oxide, calcium hydroxide, and sodium 12-alkylbenzenesulfonate.

8. The heavy-load asphalt pavement modifier according to claim 1, characterized in that, The antioxidant comprises at least one of the following: N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, tris(2,4-di-tert-butyl)phosphite, and dilauryl thiodipropionate.

9. A method for preparing a heavy-load asphalt pavement modifier, characterized in that, include: Weigh out the following raw materials in parts by weight: 100 parts of recycled polyamide, 5-25 parts of glycidyl methacrylate copolymer compatibilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of lubricant, 1-5 parts of silane coupling agent, 1-5 parts of acid scavenger, and 0.1-2 parts of antioxidant. The raw materials are mixed evenly to obtain a mixture, wherein the mixing temperature is 60~100℃; The mixture is melted and kneaded, then extruded and granulated. After cooling and drying, a heavy-duty asphalt pavement modifier is obtained. The mixture is melt-kneaded using a twin-screw extruder and reacted extruded using a melt booster pump. The barrel temperature of the twin-screw extruder is 220℃~260℃, the pressure difference between the inlet and outlet of the melt booster pump is controlled at 3~20MPa, and the screw speed of the twin-screw extruder is 100~250r / min.

10. The application of the heavy-duty asphalt pavement modifier as described in any one of claims 1-8 in asphalt mixtures.

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