High-performance epoxy asphalt concrete and preparation method thereof

Abstract

The invention discloses high-performance epoxy asphalt concrete. The high-performance epoxy asphalt concrete is prepared from high-performance epoxy asphalt, aggregate and fibers, the high-performance epoxy asphalt is composed of a component A, a component B and a component C, the component A is modified asphalt, the component B is modified epoxy resin, and the component C is a curing agent; the invention also discloses a preparation method of the high-performance epoxy asphalt concrete. According to the epoxy asphalt concrete disclosed by the invention, the graphene is adopted to modify the epoxy asphalt, so that the toughening effect of the epoxy asphalt is improved; meanwhile, the phase structures of the epoxy resin and the road asphalt are regulated and controlled by adopting the styrene thermoplastic elastomer, so that the compatibility and toughness of the epoxy resin and the asphalt are further improved; the styrene thermoplastic elastomer is adopted to carry out surface modification on the graphene, so that not only are the dispersity and interface bonding property of the graphene and the epoxy asphalt improved, but also the graphene serving as a flexible chain segment can further toughen the epoxy asphalt, the cracking resistance and fatigue durability of the epoxy asphalt concrete are improved, and the service life of the epoxy asphalt concrete is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of road materials, and in particular relates to a high-performance epoxy asphalt concrete and a preparation method thereof. Background Art

[0002] Epoxy asphalt paving systems boast excellent mechanical properties and high-temperature stability. Since their successful application on the Nanjing Second Yangtze River Bridge in 2001, achieving excellent results, they have been widely adopted and applied in numerous steel bridge deck paving projects across my country, becoming one of the mainstream paving solutions for steel bridges. While epoxy asphalt paving materials offer advantages such as high strength and excellent corrosion resistance, their primary component, epoxy resin, is a thermosetting polymer that becomes brittle and rigid after chemical crosslinking. This results in poor deformation and toughness, which can easily lead to premature cracking in the mixture. This cracking significantly impacts the integrity of the pavement, leading to a decrease in overall performance and durability. Furthermore, epoxy resin's poor compatibility with asphalt and its tendency to delaminate significantly impact its application in steel bridge deck paving. Toughening and modifying epoxy asphalt and improving the compatibility of the two materials have been significant research challenges and have garnered increasing attention in recent years. Summary of the Invention

[0003] The present invention aims to solve, at least to some extent, one of the technical problems in the related art. To this end, the main purpose of the present invention is to provide a high-performance epoxy asphalt concrete having excellent crack resistance and fatigue durability, which can effectively extend the service life of the epoxy asphalt concrete.

[0004] The present invention also provides a method for preparing the high-performance epoxy asphalt concrete.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A high-performance epoxy asphalt concrete, which consists of high-performance epoxy asphalt, aggregate and fiber; the weight of the high-performance epoxy asphalt accounts for 6.3-7.0% of the weight of the aggregate, and the weight of the fiber accounts for 0.2-0.5% of the weight of the aggregate; and the high-performance epoxy asphalt consists of three components A, B and C, wherein the component A is modified asphalt, the component B is modified epoxy resin, and the component C is a curing agent, the weight ratio of the components B and C is 70-100:50-80, and the total mass of the components B and C accounts for 40-50% of the weight of the high-performance epoxy asphalt.

[0007] In certain specific embodiments, the curing agent is composed of a long carbon chain unsaturated primary amine, an aromatic amine and an amino-terminated hyperbranched polyamide in a mass ratio of 70-120:10-30:10-20, and is obtained by stirring at room temperature for 10-30 minutes.

[0008] Furthermore, the long carbon chain unsaturated primary amine is cis-oleyl primary amine; the aromatic amine curing agent is one or more of 4,4'-diphenyldisulfide, bis(2-aminophenyl)disulfide, and 4,4'-diaminodiphenyl disulfide; the amino group number of the amino-terminated hyperbranched polyamide is 3-15 mol, and the molecular weight is 300-2000.

[0009] In certain specific embodiments, the modified asphalt consists of 100 parts of road asphalt, 2-5 parts of styrene-based thermoplastic elastomer, 5-15 parts of rubber powder, 2-5 parts of rubber oil, and 0.1-0.3 parts of anti-aging agent.

[0010] In certain specific embodiments, the modified epoxy resin is a styrene-based thermoplastic elastomer covalently grafted graphene-modified epoxy resin, which is prepared by the following method:

[0011] S1: Pour a toluene solution of a styrene-based thermoplastic elastomer into a flask, add a graphene dispersion dropwise while stirring, protect under a nitrogen atmosphere, and react at 90-110° C. for 36 hours; after the reaction is completed, remove the unreacted styrene-based thermoplastic elastomer, and dry to obtain the styrene-based thermoplastic elastomer covalently grafted with graphene;

[0012] S2: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin at a weight ratio of 50-100:5-20:5-20 at room temperature to obtain a composite epoxy resin;

[0013] S3: At 50-60° C., the composite epoxy resin and the styrene-based thermoplastic elastomer covalently grafted graphene are uniformly mixed by ultrasonic dispersion at a weight ratio of 100:0.1-0.5, the dispersion temperature is 40-60° C., and the dispersion time is 10-30 min to obtain a styrene-based thermoplastic elastomer covalently grafted graphene modified epoxy resin.

[0014] Furthermore, the styrene-based thermoplastic elastomer is at least one of a maleic anhydride grafted styrene-butadiene-styrene block copolymer or a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer.

[0015] Furthermore, the graphene dispersion is at least one of an N-methylpyrrolidone dispersion of graphene, a dimethylformamide dispersion of graphene, or a dimethyl sulfoxide dispersion of graphene.

[0016] Furthermore, the glycidyl ester is at least one of diglycidyl phthalate, diglycidyl dimer acid ester, diglycidyl sebacate, and diglycidyl azelate; and the hyperbranched epoxy resin has an epoxy value of 0.15-0.2 mol / 100g and a molecular weight of 3000-4000.

[0017] As the same concept, the present invention also provides a method for preparing the high-performance epoxy asphalt concrete, comprising the following steps:

[0018] 1) Heat the road asphalt to 170-180°C, add 2-5 parts of styrene-based thermoplastic elastomer to 100 parts of the road asphalt, and shear for 60-120 minutes at a shear rate of 3000-4000 r / min. Then, add 5-15 parts of rubber powder, 2-5 parts of rubber oil, and 0.1-0.3 parts of an anti-aging agent in sequence, and continue stirring for 30-90 minutes while maintaining the temperature at 180-190°C to prepare component A;

[0019] 2) Mix component B and component C in a ratio of 70-100:50-80, stir for 3-5 minutes, and prepare mixture D;

[0020] 3) Add mixture D to component A in proportion at 180-190°C and stir for 3-5 minutes to prepare high-performance epoxy asphalt, maintaining the temperature at 170-185°C;

[0021] 4) The aggregates are mixed and heated to 170-190° C., and then the fibers are added and stirred for 20-30 seconds, and then the high-performance epoxy asphalt is added and stirred for 120-180 seconds, and the mixing temperature is maintained at 170-185° C. until the mixture is uniformly mixed to obtain the high-performance epoxy asphalt concrete.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] 1) The epoxy asphalt concrete of the present invention modifies the epoxy resin by covalently grafting graphene with a styrene-based thermoplastic elastomer, which significantly improves the dispersibility and interfacial bonding of graphene in the matrix resin, better exerts the reinforcing and toughening effects of graphene, and the graphene itself can further toughen the epoxy asphalt as a flexible segment; the phase structure of the epoxy resin and road asphalt is regulated by the styrene-based thermoplastic elastomer, which can improve the compatibility of the epoxy resin and asphalt; in addition, the end-amino hyperbranched polyamide curing agent is used to further play a role in toughening and softening, thereby making the epoxy asphalt concrete have excellent crack resistance and fatigue durability, thereby extending its service life. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to specific examples. The following examples are merely illustrative and non-restrictive, and should not be used to limit the scope of protection of the present invention.

[0025] When expressing a certain amount, concentration or other value or parameter in the form of a range, preferred range, or preferred upper and lower numerical limits, it should be understood that it is equivalent to specifically disclosing any range by combining any pair of upper range limits or preferred numerical values with any lower range limit or preferred numerical value, without considering whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values listed herein include the endpoints of the range and all integers and fractions within the range.

[0026] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0027] The materials, methods, and examples herein are illustrative and, unless otherwise indicated, are not to be construed as limiting.

[0028] In the following examples, the hyperbranched epoxy resin has an epoxy value of 0.16 mol / 100 g and an average molecular weight of 3800;

[0029] The amino group number of the amino-terminated hyperbranched polyamide is 6 mol, and the molecular weight is 1000.

[0030] The anti-aging agent is a composite of an ultraviolet absorber and a hindered amine light stabilizer, with a mass ratio of 1:1. The ultraviolet absorber is UV531 and the hindered amine light stabilizer is HS-944.

[0031] The maleic anhydride grafted styrene-butadiene-styrene block copolymer (MAH-g-SBS) was purchased from Dongguan Chengyi Plastic Co., Ltd. with a block ratio of 30 / 70 and a grafting rate of 1.0%; and the maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer (MAH-g-SEBS) was purchased from Dongguan Chengyi Plastic Co., Ltd. with a block ratio of 30 / 70 and a grafting rate of 1.0%;

[0032] The graphene is amino-modified graphene, which was purchased from Suzhou Tanfeng Graphene Technology Co., Ltd.

[0033] Example 1

[0034] This embodiment provides a method for preparing high-performance epoxy asphalt concrete, which comprises the following steps:

[0035] 1) Preparation of component B modified epoxy resin

[0036] S1: Pour a toluene solution of a styrene-based thermoplastic elastomer into a flask, add a graphene dispersion dropwise while stirring, protect under a nitrogen atmosphere, and react at 90° C. for 36 hours; after the reaction is completed, remove the unreacted styrene-based thermoplastic elastomer, and dry to obtain a styrene-based thermoplastic elastomer covalently grafted with graphene;

[0037] S2: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin at a weight ratio of 50:5:5 at room temperature to obtain a composite epoxy resin;

[0038] S3: At 50° C., the composite epoxy resin and the styrene-based thermoplastic elastomer covalently grafted graphene were uniformly mixed by ultrasonic dispersion at a weight ratio of 100:0.1, the dispersion temperature was 40° C., and the dispersion time was 30 min to obtain a styrene-based thermoplastic elastomer covalently grafted graphene modified epoxy resin (component B);

[0039] The styrene-based thermoplastic elastomer is a maleic anhydride grafted styrene-butadiene-styrene block copolymer;

[0040] The graphene dispersion is an N-methylpyrrolidone dispersion of graphene; and the glycidyl ester is diglycidyl phthalate.

[0041] 2) Preparation of component A modified asphalt

[0042] Heat the road asphalt to 170°C, add 2 parts of styrene-based thermoplastic elastomer to 100 parts of the road asphalt, and shear for 60 minutes at a shear rate of 3000 r / min. Then, add 5 parts of rubber powder, 2 parts of rubber oil, and 0.1 parts of anti-aging agent in sequence, and continue stirring for 30 minutes. Maintain the temperature at 180°C to prepare component A.

[0043] The styrene-based thermoplastic elastomer is a maleic anhydride grafted styrene-butadiene-styrene block copolymer.

[0044] 3) Preparation of component C curing agent

[0045] The curing agent consists of a long carbon chain unsaturated primary amine, an aromatic amine and an amino-terminated hyperbranched polyamide in a mass ratio of 70:10:10, and is prepared by stirring at room temperature for 10 minutes.

[0046] The long carbon chain unsaturated primary amine is cis-oleyl primary amine; and the aromatic amine curing agent is bis(2-aminophenyl) disulfide.

[0047] 4) Components B and C were mixed in a ratio of 70:50 and stirred for 3 minutes to prepare mixture D;

[0048] 5) At 180°C, add mixture D to component A in proportion (the mass of mixture D accounts for 40% of the weight of high-performance epoxy asphalt).

[0049] The aggregates are mixed and heated to 170°C, and then fibers are added and stirred for 20 seconds, and then high-performance epoxy asphalt is added and stirred for 120 seconds, wherein the weight of the high-performance epoxy asphalt is 6.3% of the weight of the aggregate and the weight of the fibers is 0.2% of the weight of the aggregate; the mixing temperature is maintained at 170°C, and the high-performance epoxy asphalt concrete is obtained after mixing evenly.

[0050] Example 2

[0051] This embodiment provides a method for preparing high-performance epoxy asphalt concrete, which comprises the following steps:

[0052] 1) Preparation of component B modified epoxy resin

[0053] S1: Pour a toluene solution of a styrene-based thermoplastic elastomer into a flask and dropwise add the graphene dispersion while stirring. The mixture is then heated at 90°C for 36 hours under a nitrogen atmosphere. After the reaction is complete, remove the unreacted styrene-based thermoplastic elastomer and dry the mixture to obtain the styrene-based thermoplastic elastomer covalently grafted with graphene.

[0054] S2: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin in a weight ratio of 80:12:15 at room temperature to obtain a composite epoxy resin;

[0055] S3: At 50° C., the composite epoxy resin and the styrene-based thermoplastic elastomer covalently grafted graphene were uniformly mixed by ultrasonic dispersion at a weight ratio of 100:0.3, the dispersion temperature was 50° C., and the dispersion time was 20 min to obtain a styrene-based thermoplastic elastomer covalently grafted graphene modified epoxy resin (component B);

[0056] The styrene-based thermoplastic elastomer is a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer;

[0057] The graphene dispersion is a dimethyl sulfoxide dispersion of graphene; and the glycidyl ester is dimer acid diglycidyl ester.

[0058] 2) Preparation of component A modified asphalt

[0059] Heat the road asphalt to 175°C, add 3 parts of styrene-based thermoplastic elastomer to 100 parts of the road asphalt, and shear for 80 minutes at a shear rate of 3500 r / min. Then, add 10 parts of rubber powder, 3 parts of rubber oil, and 0.2 parts of anti-aging agent in sequence, and continue stirring for 60 minutes. Maintain the temperature at 180°C to prepare component A.

[0060] The styrene-based thermoplastic elastomer is a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer.

[0061] 3) Preparation of component C curing agent

[0062] The curing agent consists of a long carbon chain unsaturated primary amine, an aromatic amine and an amino-terminated hyperbranched polyamide in a mass ratio of 80:20:15, and is prepared by stirring at room temperature for 10 minutes.

[0063] The long carbon chain unsaturated primary amine is cis-oleyl primary amine; and the aromatic amine curing agent is 4,4'-dithiodiphenylamine.

[0064] 4) Components B and C were mixed in a ratio of 80:70 and stirred for 3 minutes to prepare mixture D;

[0065] 5) At 180°C, add mixture D to component A in proportion (the mass of mixture D accounts for 45% of the weight of high-performance epoxy asphalt).

[0066] After the aggregate is mixed, it is heated to 180°C, and then the fiber is added and stirred for 25 seconds, and then the high-performance epoxy asphalt is added and stirred for 150 seconds, wherein the weight of the high-performance epoxy asphalt is 6.5% of the weight of the aggregate, and the weight of the fiber is 0.3% of the weight of the aggregate; the mixing temperature is maintained at 175°C, and the high-performance epoxy asphalt concrete is obtained after mixing evenly.

[0067] Example 3

[0068] This embodiment provides a method for preparing high-performance epoxy asphalt concrete, which comprises the following steps:

[0069] 1) Preparation of component B modified epoxy resin

[0070] S1: Pour a toluene solution of a styrene-based thermoplastic elastomer into a flask and dropwise add the graphene dispersion while stirring. The mixture is then heated at 100°C for 36 hours under a nitrogen atmosphere. After the reaction is complete, remove the unreacted styrene-based thermoplastic elastomer and dry the mixture to obtain the styrene-based thermoplastic elastomer covalently grafted with graphene.

[0071] S2: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin at a weight ratio of 100:20:20 at room temperature to obtain a composite epoxy resin;

[0072] S3: At 60° C., the composite epoxy resin and the styrene-based thermoplastic elastomer covalently grafted graphene were uniformly mixed by ultrasonic dispersion at a weight ratio of 100:0.5, the dispersion temperature was 60° C., and the dispersion time was 10 min to obtain a styrene-based thermoplastic elastomer covalently grafted graphene modified epoxy resin (component B);

[0073] The styrene-based thermoplastic elastomer is a maleic anhydride grafted styrene-butadiene-styrene block copolymer; the graphene dispersion is a dimethylformamide dispersion of graphene; and the glycidyl ester is diglycidyl phthalate.

[0074] 2) Preparation of component A modified asphalt

[0075] Heat the road asphalt to 180°C, add 5 parts of styrene-based thermoplastic elastomer to 100 parts of the road asphalt, and shear for 120 minutes at a shear rate of 3000 r / min. Then, add 15 parts of rubber powder, 5 parts of rubber oil, and 0.3 parts of anti-aging agent in sequence, and continue stirring for 90 minutes. Maintain the temperature at 190°C to prepare component A.

[0076] The styrene-based thermoplastic elastomer is a maleic anhydride grafted styrene-butadiene-styrene block copolymer;

[0077] 3) Preparation of component C curing agent

[0078] The curing agent consists of a long carbon chain unsaturated primary amine, an aromatic amine and an amino-terminated hyperbranched polyamide in a mass ratio of 120:30:20, and is prepared by stirring at room temperature for 30 minutes.

[0079] Furthermore, the long carbon chain unsaturated primary amine is cis-oleyl primary amine; and the aromatic amine curing agent is 4,4'-diaminodiphenyl disulfide.

[0080] 4) Components B and C were mixed in a ratio of 100:80 and stirred for 3 minutes to prepare mixture D;

[0081] 5) At 180°C, add mixture D to component A in proportion (the mass of mixture D accounts for 40% of the weight of high-performance epoxy asphalt).

[0082] The aggregates are mixed and heated to 170°C, and then fibers are added and stirred for 20 seconds, and then high-performance epoxy asphalt is added and stirred for 120 seconds, wherein the weight of the high-performance epoxy asphalt is 7.0% of the weight of the aggregate and the weight of the fibers is 0.5% of the weight of the aggregate; the mixing temperature is maintained at 185°C, and the high-performance epoxy asphalt concrete is obtained after mixing evenly.

[0083] Comparative Example 1

[0084] The preparation method of a high-performance epoxy asphalt concrete provided in this comparative example is basically the same as that of Example 2, except that in step 1), instead of using a styrene-based thermoplastic elastomer copolymerized with graphene, a graphene-modified epoxy resin is directly used, specifically:

[0085] 1) Preparation of component B modified epoxy resin

[0086] S1: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin in a weight ratio of 80:12:15 at room temperature to obtain a composite epoxy resin;

[0087] S2: At 50° C., the composite epoxy resin and graphene were uniformly dispersed by ultrasonic dispersion at a weight ratio of 100:0.3, the dispersion temperature was 50° C., and the dispersion time was 20 min to obtain a graphene-modified epoxy resin;

[0088] The styrene-based thermoplastic elastomer is a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer;

[0089] The graphene dispersion is a dimethyl sulfoxide dispersion of graphene; and the glycidyl ester is dimer acid diglycidyl ester.

[0090] Comparative Example 2

[0091] The preparation method of a high-performance epoxy asphalt concrete provided in this comparative example is basically the same as that of Example 2, except that in step 2), no styrene-based thermoplastic elastomer is used. Specifically,

[0092] 2) Preparation of component A modified asphalt

[0093] Heat the road asphalt to 175°C, add 10 parts of rubber powder, 3 parts of rubber oil, and 0.2 parts of anti-aging agent to 100 parts of road asphalt, and continue stirring for 60 minutes while maintaining the temperature at 180°C to prepare component A.

[0094] Comparative Example 3

[0095] The preparation method of a high-performance epoxy asphalt concrete provided in this comparative example is basically the same as that of Example 2, except that in steps 1) and 2), instead of using a styrene-based thermoplastic elastomer copolymerized with graphene, a graphene-modified epoxy resin is directly used, and no styrene-based thermoplastic elastomer is used. Specifically,

[0096] 1) Preparation of component B modified epoxy resin

[0097] S1: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin in a weight ratio of 80:12:15 at room temperature to obtain a composite epoxy resin;

[0098] S2: At 50° C., the composite epoxy resin and graphene were uniformly dispersed by ultrasonic dispersion at a weight ratio of 100:0.3, the dispersion temperature was 50° C., and the dispersion time was 20 min to obtain a graphene-modified epoxy resin;

[0099] The styrene-based thermoplastic elastomer is a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer;

[0100] The graphene dispersion is a dimethyl sulfoxide dispersion of graphene; and the glycidyl ester is dimer acid diglycidyl ester.

[0101] 2) Preparation of component A modified asphalt

[0102] Heat the road asphalt to 175°C, add 10 parts of rubber powder, 3 parts of rubber oil, and 0.2 parts of anti-aging agent to 100 parts of road asphalt, and continue stirring for 60 minutes while maintaining the temperature at 180°C to prepare component A.

[0103] Comparative Example 4

[0104] This comparative example provides a method for preparing high-performance epoxy asphalt concrete, which is basically the same as that of Example 2, except that in step 3), amino-terminated hyperbranched polyamide is not used. Specifically,

[0105] 3) Preparation of component C curing agent

[0106] The curing agent is composed of a long carbon chain unsaturated primary amine and an aromatic amine in a mass ratio of 80:20 and is prepared by stirring at room temperature for 10 minutes.

[0107] The long carbon chain unsaturated primary amine is cis-oleyl primary amine; and the aromatic amine curing agent is 4,4'-dithiodiphenylamine.

[0108] Performance testing:

[0109] This application takes Example 2 as an example. According to JTG / T3364-02-2019—"Technical Specifications for Design and Construction of Highway Steel Bridge Deck Pavement" and JTG+E20-2011—"Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" and other specifications, the performance indicators of the prepared high-performance epoxy asphalt concrete are tested, and the results are shown in Table 1.

[0110] Table 1 Performance indicators of high performance epoxy asphalt concrete

[0111] Inspection items unit The present invention Existing technology Dynamic stability (60℃) times / mm 63000 57570 Bending strain (-10℃) με 5751 3823 Impact toughness N·m 2.94 2.16 Fatigue times (800 microstrain) Ten thousand times 257 149

[0112] According to the data in Table 1, the high-performance epoxy asphalt concrete provided in this application has excellent high and low temperature performance, as well as excellent ability to resist impact loads and durability.

[0113] The present invention also tests various properties of the epoxy asphalt concrete prepared in Comparative Examples 1-4. The test methods are as above, and the specific results are shown in Table 2:

[0114] Table 2 Performance indicators of epoxy asphalt concrete of Example 2 and Comparative Examples 1-4

[0115]

[0116] As can be seen from Table 2, the covalent grafting of graphene with styrene-based thermoplastic elastomer can better play the reinforcing and toughening effect of graphene, and it itself can further toughen epoxy asphalt as a flexible segment; the use of styrene-based thermoplastic elastomer can synergistically improve the performance of epoxy asphalt with the covalent grafting of graphene with styrene-based thermoplastic elastomer; in addition, the end-amino hyperbranched polyamide further plays a role in toughening and softening, thereby making the epoxy asphalt concrete of the present invention have excellent crack resistance and fatigue durability.

[0117] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A high performance epoxy asphalt concrete, characterized in that: It consists of high-performance epoxy asphalt, aggregate and fiber; the weight of high-performance epoxy asphalt accounts for 6.3-7.0% of the weight of aggregate, and the weight of fiber accounts for 0.2-0.5% of the weight of aggregate; and the high-performance epoxy asphalt consists of three components A, B and C, wherein the component A is modified asphalt, the component B is modified epoxy resin, and the component C is a curing agent. The weight ratio of the components B and C is 70-100:50-80, and the total mass of the components B and C accounts for 40-50% of the weight of the high-performance epoxy asphalt.

2. The high performance epoxy asphalt concrete according to claim 1, characterized in that The curing agent consists of a long carbon chain unsaturated primary amine, an aromatic amine and an amino-terminated hyperbranched polyamide in a mass ratio of 70-120:10-30:10-20, and is prepared by stirring at room temperature for 10-30 minutes.

3. The high performance epoxy asphalt concrete according to claim 2, characterized in that: The long carbon chain unsaturated primary amine is cis-oleyl primary amine; the aromatic amine curing agent is one or more of 4,4'-diphenyldisulfide, bis(2-aminophenyl)disulfide, and 4,4'-diaminodiphenyl disulfide; the amino group number of the amino-terminated hyperbranched polyamide is 3-15 mol, and the molecular weight is 300-2000.

4. The high performance epoxy asphalt concrete according to claim 1, characterized in that The modified asphalt consists of 100 parts of road asphalt, 2-5 parts of styrene-based thermoplastic elastomer, 5-15 parts of rubber powder, 2-5 parts of rubber oil, and 0.1-0.3 parts of anti-aging agent.

5. The high performance epoxy asphalt concrete according to claim 1, characterized in that: The modified epoxy resin is a styrene-based thermoplastic elastomer covalently grafted graphene-modified epoxy resin, which is prepared by the following method: S1: Pour a toluene solution of a styrene-based thermoplastic elastomer into a flask, add a graphene dispersion dropwise while stirring, protect under a nitrogen atmosphere, and react at 90-110° C. for 36 hours; after the reaction is completed, remove the unreacted styrene-based thermoplastic elastomer, and dry to obtain the styrene-based thermoplastic elastomer covalently grafted with graphene; S2: mixing bisphenol A epoxy resin, glycidyl ester and hyperbranched epoxy resin at a weight ratio of 50-100:5-20:5-20 at room temperature to obtain a composite epoxy resin; S3: At 50-60° C., the composite epoxy resin and the styrene-based thermoplastic elastomer covalently grafted graphene are uniformly mixed by ultrasonic dispersion at a weight ratio of 100:0.1-0.5, the dispersion temperature is 40-60° C., and the dispersion time is 10-30 min to obtain a styrene-based thermoplastic elastomer covalently grafted graphene modified epoxy resin.

6. The high performance epoxy asphalt concrete according to claim 4 or 5, characterized in that: The styrene-based thermoplastic elastomer is at least one of a maleic anhydride grafted styrene-butadiene-styrene block copolymer or a maleic anhydride grafted hydrogenated styrene-butadiene-styrene block copolymer.

7. The high performance epoxy asphalt concrete according to claim 5, characterized in that: The graphene dispersion is at least one of an N-methylpyrrolidone dispersion of graphene, a dimethylformamide dispersion of graphene, or a dimethyl sulfoxide dispersion of graphene.

8. The high performance epoxy asphalt concrete according to claim 7, characterized in that: The glycidyl ester is at least one of diglycidyl phthalate, diglycidyl dimer acid ester, diglycidyl sebacate, and diglycidyl azelate; the hyperbranched epoxy resin has an epoxy value of 0.15-0.2 mol / 100g and a molecular weight of 3000-4000.

9. A method for preparing high-performance epoxy asphalt concrete according to any one of claims 1 to 8, characterized in that: The steps include: 1) Heat the road asphalt to 170-180°C, add 2-5 parts of styrene-based thermoplastic elastomer to 100 parts of the road asphalt, and shear for 60-120 minutes at a shear rate of 3000-4000 r / min. Then, add 5-15 parts of rubber powder, 2-5 parts of rubber oil, and 0.1-0.3 parts of an anti-aging agent in sequence, and continue stirring for 30-90 minutes while maintaining the temperature at 180-190°C to prepare component A; 2) Mix component B and component C in a ratio of 70-100:50-80, stir for 3-5 minutes, and prepare mixture D; 3) Add mixture D to component A in proportion at 180-190°C and stir for 3-5 minutes to prepare high-performance epoxy asphalt, maintaining the temperature at 170-185°C; 4) The aggregates are mixed and heated to 170-190° C., and then the fibers are added and stirred for 20-30 seconds, and then the high-performance epoxy asphalt is added and stirred for 120-180 seconds, and the mixing temperature is maintained at 170-185° C. until the mixture is uniformly mixed to obtain the high-performance epoxy asphalt concrete.

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