Resin asphalt concrete and preparation method thereof

Abstract

The present invention discloses a resin asphalt concrete and a preparation method thereof, belonging to the technical field of concrete preparation. The asphalt concrete is composed of three components: A, B, and C. Component A is modified asphalt, component B is an epoxy resin main agent, and component C is stone. The mass ratio of the three components A, B, and C is 130-170:6-18:450-800. The resin asphalt of the present invention fundamentally changes the thermoplasticity of asphalt, and the obtained resin asphalt mixture has strong rutting resistance and low-temperature deformation performance. The construction process of the present invention is relatively simple and can be used not only for new expansion joints, but also for the rapid maintenance of existing expansion joints. The raw material cost is low and the economy is significant.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete preparation, and in particular relates to resin asphalt concrete and a preparation method thereof. Background Art

[0002] Currently, asphalt is the most commonly used binder for seamless expansion joints. However, it suffers from low-temperature brittleness and insufficient high-temperature stability. Therefore, asphalt-based materials require extensive modification to produce high-performance elastomers. Because seamless expansion joint filling materials are rich in asphalt, their low-temperature elongation and deformation and high-temperature traffic load-bearing capacity are both dependent on the properties of the asphalt binder, placing higher demands on the asphalt's compatibility with both low and high temperatures.

[0003] Common seamless expansion joint materials are composed of high-dose asphalt and specifically graded aggregates. However, high asphalt dosages can cause defects such as rutting, oiling, and shifting in high summer temperatures, and cracking and interface delamination in low winter temperatures, resulting in a shorter service life. This not only places significant pressure on transportation but also increases maintenance costs.

[0004] CN 108659555A discloses a high-viscosity, high-elasticity asphalt for seamless expansion joints. This patent only incorporates epoxy resin without a curing agent, thus maintaining the asphalt's thermoplastic properties. CN 116396014 A discloses a rubber-powdered epoxy asphalt binder and prefabricated structure for expansion joints, as well as its preparation method and application. While this improves the asphalt's thermoplasticity, resulting in seamless expansion joints with excellent high- and low-temperature performance, the resin content is high, resulting in high costs and no significant improvement in deformation capacity. Furthermore, the system requires a long curing time, requiring only prefabrication in a prefabrication yard and on-site installation and construction, making it less adaptable to the maintenance and treatment of existing expansion joints of varying types. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for preparing resin asphalt concrete to solve the problems of rutting, oiling and displacement of current asphalt seamless expansion joint materials in high temperature environments in summer and cracks and interface peeling in low temperature environments in winter.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: the asphalt concrete is composed of three components A, B, and C, wherein component A is modified asphalt, component B is epoxy resin main agent, and component C is stone, and the mass ratio of the three components A, B, and C is 130-170:6-18:450-800.

[0007] Furthermore, the modified asphalt is composed of 100 parts of road asphalt, 3-10 parts of thermoplastic elastomer, 15-30 parts of rubber powder, 2-5 parts of rubber oil, 6-18 parts of curing agent, 0.1-1 part of anti-aging agent, 1-5 parts of organic bentonite, and 0.05-0.2 parts of maleic anhydride grafted modified graphene; the epoxy resin main agent is composed of bisphenol A epoxy resin E51, liquid nitrile rubber, and carbonate in a mass ratio of 60-110:10-25:10-25; the stone is gravel of a single particle size, with a high-temperature crushing value of ≤25%, a compressive strength of ≥120 MPa, and a particle size of 9.5-13.2 mm or 13.2-16 mm.

[0008] Furthermore, the curing agent is composed of an aliphatic primary amine, a modified phenolic amine, a polysulfide compound and an accelerator, with a mass ratio of 70-100:10-20:5-15:3-13; the relative molecular mass of the aliphatic primary amine is 200-300, and the amine value is 180-260 mgKOH / g; the amine value of the modified phenolic amine is 200-300 mgKOH / g; the polysulfide compound is a liquid with a relative molecular mass of 500-1000; and the accelerator is a mixture of one or more of bisphenol, phenol and m-cresol.

[0009] Furthermore, the acid value of the liquid nitrile rubber is 25-40 mgKOH / g, and the relative molecular mass is 3000-4500; and the carbonate is a mixture of one or more of EC, PC, and GC.

[0010] Furthermore, the road asphalt is 70# base asphalt, 90# base asphalt or a mixture of the two; the thermoplastic elastomer is linear styrene-butadiene-styrene block copolymer SBS; the rubber powder is bias tire rubber powder with a particle size of 40-60 mesh, a natural rubber content of ≥25%, and a carbon black content of 28-35%; the anti-aging agent is composed of a hindered phenol antioxidant and an ultraviolet absorber in a mass ratio of 1:1.

[0011] Furthermore, a method for preparing resin asphalt concrete is also provided, comprising the following steps.

[0012] S1. After heating the road asphalt, a styrene-based thermoplastic elastomer is added, the mixture is sheared, and then rubber powder, rubber oil, a curing agent, an anti-aging agent, an organic bentonite, and maleic anhydride-grafted modified graphene are added in sequence, and the mixture is continuously stirred to obtain a modified asphalt;

[0013] S2, mixing bisphenol A epoxy resin E51, liquid nitrile rubber, and glycerol carbonate in proportion, stirring, and then ultrasonically dispersing to obtain an epoxy resin main agent;

[0014] S3, mixing the modified asphalt of step S1 with the epoxy resin main agent of step S2, and stirring to obtain a resin asphalt binder;

[0015] S4. After the stones are heated, they are mixed with resin asphalt binder and stirred continuously to obtain resin asphalt concrete.

[0016] Furthermore, the road asphalt heating temperature in step S1 is 170-185°C, the shear time after adding the thermoplastic elastomer is 60-120 minutes, and the shear rate is 3000-4000 r / min; the stirring time after adding rubber powder, rubber oil, curing agent, anti-aging agent, organic bentonite and maleic anhydride grafted modified graphene is 30-90 minutes, and the stirring temperature is 170-185°C.

[0017] Furthermore, the stirring temperature in step S2 is 40-60° C., and the stirring time is 3-10 min.

[0018] Furthermore, during the mixing in step S3, the temperature of the modified asphalt is 170-185°C, the temperature of the epoxy resin main agent is 40-60°C, the stirring time is 3-5 minutes, and the stirring temperature is maintained at 170-185°C.

[0019] Furthermore, the stone heating temperature in step S4 is 175-190°C, the heating time is not less than 4 hours, the mixing temperature of the stone and the resin asphalt binder is 170-185°C, and the mixing time is 3-5 minutes.

[0020] The beneficial effects of the present invention are:

[0021] (1) The introduction of epoxy resin and curing agent can change the thermoplasticity of asphalt, making it have certain thermosetting properties, thereby improving the high-temperature rutting resistance and interfacial bonding performance of resin asphalt mixture.

[0022] (2) This scheme adopts a curing system of aliphatic primary amines, modified phenolic amines, polysulfide compounds and accelerators, as well as liquid nitrile rubber and glycerol carbonate. On the one hand, it can effectively regulate the operation time and curing time of the resin asphalt mixture. Among them, the mixture has an operation time of about 1 hour at high temperature and can form initial strength in a relatively short time at room temperature, which is conducive to opening traffic as soon as possible. On the other hand, it can effectively improve the flexibility of the resin asphalt and can synergistically enhance the low-temperature cracking resistance of the resin asphalt mixture with maleic anhydride grafted modified graphene; organic bentonite can further improve the adhesion between the resin asphalt binder and the stone.

[0023] (3) The construction process of the present invention is relatively simple and can be used not only for new expansion joints, but also for the rapid repair of existing expansion joints. The raw material cost is low and the economy is significant.

[0024] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. DETAILED DESCRIPTION

[0025] A method for preparing resin asphalt concrete.

[0026] Example 1

[0027] S1. After heating 100 parts of road asphalt (70# base asphalt) to 170°C, 3 parts of linear styrene-butadiene-styrene block copolymer (SBS) were added, and shearing was carried out at 3000 r / min for 60 min using a shearing machine. Then, 30 parts of 40-mesh bias tire rubber powder, 2 parts of rubber oil, 11 parts of a curing agent consisting of an aliphatic primary amine (amine value of 203 mgKOH / g) with a mass ratio of 80:10:6:5, a modified phenolic amine (amine value of 215 mgKOH / g), a polysulfide compound and an accelerator (phenol) were added in sequence, 0.3 parts of an anti-aging agent consisting of a hindered phenol antioxidant 2246 and an ultraviolet absorber UV-622 with a mass ratio of 1:1, 2 parts of organic bentonite and 0.05 parts of maleic anhydride grafted modified graphene were added, and the mixture was stirred at 180°C for 30 min to obtain modified asphalt;

[0028] S2, bisphenol A epoxy resin E51, liquid nitrile rubber (acid value 28 mgKOH / g), and carbonate EC were mixed in a mass ratio of 60:10:10, and stirred at 40°C for 3 minutes to obtain an epoxy resin main agent;

[0029] S3. Maintain 130 parts of the modified asphalt prepared in step S1 at 180°C and 11 parts of the epoxy resin main agent prepared in step S2 at 40°C. Mix the modified asphalt and the epoxy resin main agent, and stir for 3 minutes to obtain a resin asphalt binder. Maintain the temperature at 180°C.

[0030] S4. Heat 500 parts of 13.2-16 mm stone to 185°C and maintain for 5 hours, and then mix with resin asphalt binder in a mixing pot at 180°C for 3 minutes to obtain resin asphalt concrete.

[0031] Example 2

[0032] S1. After heating 100 parts of road asphalt (90# base asphalt) to 170°C, 5 parts of linear styrene-butadiene-styrene block copolymer SBS were added, and shearing was carried out at 3500r / min using a shearing machine for 90min. Then, 25 parts of 50-mesh bias tire rubber powder, 3 parts of rubber oil, 13 parts of a curing agent consisting of an aliphatic primary amine (amine value of 221mgKOH / g) with a mass ratio of 90:15:10:8, a modified phenolic amine (amine value of 230mgKOH / g), a polysulfide compound and an accelerator (bisphenol) were added in sequence, 0.5 parts of an anti-aging agent consisting of a hindered phenol antioxidant 425 and an ultraviolet absorber UV-531 with a mass ratio of 1:1, 3 parts of organic bentonite and 0.1 parts of maleic anhydride grafted modified graphene were added, and the mixture was stirred at 180°C for 45min to obtain modified asphalt;

[0033] S2, bisphenol A epoxy resin E51, liquid nitrile rubber (acid value 30mgKOH / g), and carbonate PC were mixed in a mass ratio of 80:15:15, and stirred at 50°C for 5 minutes to obtain an epoxy resin main agent;

[0034] S3. Maintain 140 parts of the modified asphalt prepared in step S1 at 180°C and 13 parts of the epoxy resin main agent prepared in step S2 at 50°C. Mix the modified asphalt and the epoxy resin main agent, and stir for 5 minutes to obtain a resin asphalt binder. Maintain the temperature at 180°C.

[0035] S4. Heat 600 parts of 9.5-13.2 mm stone to 185°C and maintain for 4 hours, and then mix with resin asphalt binder in a mixing pot at 180°C for 5 minutes to obtain resin asphalt concrete.

[0036] Example 3

[0037] S1. After heating 100 parts of road asphalt (a mixture of 70# base asphalt and 90# base asphalt in a mass ratio of 1:1) to 175°C, 7 parts of linear styrene-butadiene-styrene block copolymer SBS were added, and shearing was carried out at 3500r / min for 90min using a shearing machine. Then, 20 parts of 60-mesh bias tire rubber powder, 4 parts of rubber oil, 16 parts of a curing agent consisting of an aliphatic primary amine (amine value of 239mgKOH / g) with a mass ratio of 100:20:15:13, a modified phenolic amine (amine value of 253mgKOH / g), a polysulfide compound and an accelerator (m-cresol), 0.7 parts of an anti-aging agent consisting of a hindered phenol antioxidant 1010 and an ultraviolet absorber UV-326 with a mass ratio of 1:1, 5 parts of organic bentonite and 0.15 parts of maleic anhydride grafted modified graphene were added in sequence, and the mixture was stirred at 185°C for 60min to obtain modified asphalt;

[0038] S2, mixing bisphenol A epoxy resin E51, liquid nitrile rubber (acid value of 35 mgKOH / g), and carbonate GC in a mass ratio of 100:20:20, and stirring at 55° C. for 6 minutes to obtain an epoxy resin main agent;

[0039] S3. Maintaining the temperature of 185°C for 160 parts of the modified asphalt prepared in step S1 and 55°C for 16 parts of the epoxy resin main agent prepared in step S2, the modified asphalt and the epoxy resin main agent are mixed and stirred for 4 minutes to obtain a resin asphalt binder, and the temperature is maintained at 185°C.

[0040] S4. Heat 750 parts of 9.5-13.2 mm stone to 190°C and maintain for 6 hours, and then mix with resin asphalt binder in a mixing pot at 185°C for 4 minutes to obtain resin asphalt concrete.

[0041] Comparative Example 1 (same as Example 3, except that no curing agent or epoxy resin main agent is added)

[0042] S1. After heating 100 parts of road asphalt (a mixture of 70# base asphalt and 90# base asphalt in a mass ratio of 1:1) to 175°C, 7 parts of linear styrene-butadiene-styrene block copolymer (SBS) were added, and sheared at 3500 r / min for 90 minutes using a shearing machine. Then, 20 parts of 60-mesh bias tire rubber powder, 4 parts of rubber oil, 0.7 parts of an anti-aging agent consisting of a hindered phenol antioxidant 1010 and an ultraviolet absorber UV-326 in a mass ratio of 1:1, 5 parts of organic bentonite and 0.15 parts of maleic anhydride grafted modified graphene were added in sequence, and the mixture was stirred at 185°C for 60 minutes to obtain modified asphalt;

[0043] S2. Heat 750 parts of 9.5-13.2 mm stone to 190°C and maintain for 6 hours, and then mix with modified asphalt binder in a mixing pot at 185°C for 4 minutes to obtain modified asphalt concrete.

[0044] Comparative Example 2 (same as Example 3, except that no curing agent, epoxy resin main agent and maleic anhydride grafted modified graphene were added)

[0045] S1. After heating 100 parts of road asphalt (a mixture of 70# base asphalt and 90# base asphalt in a mass ratio of 1:1) to 175°C, 7 parts of linear styrene-butadiene-styrene block copolymer (SBS) were added, and sheared at 3500 r / min for 90 minutes using a shearing machine. Then, 20 parts of 60-mesh bias tire rubber powder, 4 parts of rubber oil, 0.7 parts of an anti-aging agent consisting of a hindered phenol antioxidant 1010 and an ultraviolet absorber UV-326 in a mass ratio of 1:1, and 5 parts of organic bentonite were added in sequence, and the mixture was stirred at 185°C for 60 minutes to obtain a modified asphalt;

[0046] S2. Heat 750 parts of 9.5-13.2 mm stone to 190°C and maintain for 6 hours, and then mix with modified asphalt binder in a mixing pot at 185°C for 4 minutes to obtain modified asphalt concrete.

[0047] Comparative Example 3 (same as Example 3, except that maleic anhydride grafting-modified graphene is not added)

[0048] S1. After heating 100 parts of road asphalt (a mixture of 70# base asphalt and 90# base asphalt in a mass ratio of 1:1) to 175°C, 7 parts of linear styrene-butadiene-styrene block copolymer (SBS) were added, and shearing was carried out at 3500 r / min using a shearing machine for 90 minutes. Then, 20 parts of 60-mesh bias tire rubber powder, 4 parts of rubber oil, 16 parts of a curing agent consisting of an aliphatic primary amine (amine value of 239 mgKOH / g) in a mass ratio of 100:20:15:13, a modified phenolic amine (amine value of 253 mgKOH / g), a polysulfide compound and an accelerator (m-cresol), 0.7 parts of an anti-aging agent consisting of a hindered phenol antioxidant 1010 and an ultraviolet absorber UV-326 in a mass ratio of 1:1, and 5 parts of organic bentonite were added in sequence, and the mixture was stirred at 185°C for 60 minutes to obtain a modified asphalt;

[0049] S2, mixing bisphenol A epoxy resin E51, liquid nitrile rubber (acid value of 35 mgKOH / g), and carbonate GC in a mass ratio of 100:20:20, and stirring at 55° C. for 6 minutes to obtain an epoxy resin main agent;

[0050] S3. Maintaining the temperature of 185°C for 160 parts of the modified asphalt prepared in step S1 and 55°C for 16 parts of the epoxy resin main agent prepared in step S2, the modified asphalt and the epoxy resin main agent are mixed and stirred for 4 minutes to obtain a resin asphalt binder, and the temperature is maintained at 185°C.

[0051] S4. Heat 750 parts of 9.5-13.2 mm stone to 190°C and maintain for 6 hours, and then mix with resin asphalt binder in a mixing pot at 185°C for 4 minutes to obtain resin asphalt concrete.

[0052] According to the (JTG+E20-2011) "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", Examples 1 to 3 and conventional asphalt seamless expansion joint materials were tested, and the performance index results are shown in Table 1:

[0053] Table 1 Technical index results of asphalt seamless expansion joint materials

[0054]

[0055] As shown in the table above, the resin asphalt concretes prepared in Examples 1-3 all achieved dynamic stability exceeding 2000 mm / bounce at 60°C, bending strains exceeding 6000 με at -10°C, and bond strengths with cement concrete exceeding 1.4 MPa at 25°C and 1.1 MPa at 25°C, respectively. Conventional asphalt seamless expansion joint materials, on the other hand, exhibit dynamic stability of only 875 mm / bounce at 60°C, bending strains below 4000 με at -10°C, and bond strengths with cement concrete and asphalt concrete, respectively, exceeding 1.12 MPa at 25°C and 0.79 MPa at 25°C. Comparative Example 1 and Example 3 show that the addition of epoxy resin improves the high-temperature, low-temperature, and bonding properties of resin asphalt concrete. Comparative Example 2 and Example 1 show that maleic anhydride-grafted graphene improves the overall performance of resin asphalt concrete to a certain extent, but not significantly. Example 3, Comparative Examples 1, 2, and 3 show that epoxy resin and maleic anhydride-grafted graphene synergistically enhance the low-temperature cracking resistance of resin asphalt mixtures. Therefore, the resin asphalt concrete prepared in this application outperforms conventional asphalt seamless expansion joint materials in all aspects.

[0056] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A resin asphalt concrete, characterized by: The resin asphalt concrete is composed of three components A, B, and C. Component A is modified asphalt, component B is epoxy resin main agent, and component C is stone. The mass ratio of the three components A, B, and C is 130-170:6-18:450-800. The modified asphalt is composed of 100 parts of road asphalt, 3-10 parts of thermoplastic elastomer, 15-30 parts of rubber powder, 2-5 parts of rubber oil, 6-18 parts of curing agent, 0.1-1 part of anti-aging agent, 1-5 parts of organic bentonite, and 0.05-0.2 parts of maleic anhydride grafted modified graphene; The epoxy resin main agent is composed of bisphenol A epoxy resin E51, liquid nitrile rubber, and glycerol carbonate in a mass ratio of 60-110:10-25:10-25; The stone material is crushed stone of a single particle size, with a high temperature crushing value of ≤25%, a compressive strength of ≥120MPa, and a particle size of 9.5-13.2mm or 13.2-16mm; The curing agent consists of an aliphatic primary amine, a modified phenolic amine, a polysulfide compound and an accelerator, with a mass ratio of 70-100:10-20:5-15:3-13; the aliphatic primary amine has a relative molecular mass of 200-300 and an amine value of 180-260 mgKOH / g; the modified phenolic amine has an amine value of 200-300 mgKOH / g; the polysulfide compound is liquid and has a relative molecular mass of 500-1000; and the accelerator is a mixture of one or more of bisphenol, phenol and m-cresol.

2. The resin asphalt concrete according to claim 1, characterized in that: The relative molecular mass of the liquid nitrile rubber is 3000-4500.

3. The resin asphalt concrete according to claim 1, characterized in that: The road asphalt is 70# base asphalt, 90# base asphalt or a mixture of the two; the thermoplastic elastomer is linear styrene-butadiene-styrene block copolymer SBS; the rubber powder is bias tire rubber powder with a particle size of 40-60 mesh, a natural rubber content of ≥25%, and a carbon black content of 28-35%; the anti-aging agent is composed of a hindered phenol antioxidant and a UV absorber in a mass ratio of 1:

1.

4. The resin asphalt concrete according to any one of claims 1 to 3, characterized in that: Also included is a method for preparing resin asphalt concrete, comprising the following steps: S1. After heating the road asphalt, a styrene-based thermoplastic elastomer is added, the mixture is sheared, and then rubber powder, rubber oil, a curing agent, an anti-aging agent, an organic bentonite, and maleic anhydride-grafted modified graphene are added in sequence, and the mixture is continuously stirred to obtain a modified asphalt; S2, mixing bisphenol A epoxy resin E51, liquid nitrile rubber, and glycerol carbonate in proportion, stirring, and then ultrasonically dispersing to obtain an epoxy resin main agent; S3, mixing the modified asphalt of step S1 with the epoxy resin main agent of step S2, and stirring to obtain a resin asphalt binder; S4. After the stones are heated, they are mixed with resin asphalt binder and stirred continuously to obtain resin asphalt concrete.

5. The resin asphalt concrete according to claim 4, characterized in that: The road asphalt heating temperature in step S1 is 170-185° C., the shearing time after adding the thermoplastic elastomer is 60-120 min, and the shear rate is 3000-4000 r / min; the stirring time after adding rubber powder, rubber oil, curing agent, anti-aging agent, organic bentonite and maleic anhydride grafted modified graphene is 30-90 min, and the stirring temperature is 170-185° C.

6. The resin asphalt concrete according to claim 4, characterized in that: The stirring temperature in step S2 is 40-60° C., and the stirring time is 3-10 min.

7. The resin asphalt concrete according to claim 4, characterized in that: During the mixing in step S3, the temperature of the modified asphalt is 170-185°C, the temperature of the epoxy resin main agent is 40-60°C, the stirring time is 3-5 minutes, and the stirring temperature is maintained at 170-185°C.

8. The resin asphalt concrete according to claim 4, characterized in that: The stone heating temperature in step S4 is 175-190°C, and the heating time is not less than 4 hours. The mixing temperature of the stone and the resin asphalt binder is 170-185°C, and the mixing time is 3-5 minutes.

Images