Nanoparticle and polymer composite enhanced warm-mixed modified asphalt and application thereof

Abstract

The invention discloses nano-particle and polymer composite reinforced warm mixing modified asphalt and application thereof, and relates to the technical field of environmental engineering materials.The warm mixing modified asphalt is prepared from, by weight, 60-80 parts of matrix asphalt, 5-15 parts of biomass-based polymer, 2-8 parts of nano-particles, 1-5 parts of warm mixing agent and 0.5-3 parts of silane coupling agent; the biomass-based polymer is selected from one of a biomass modified styrene-butadiene-styrene block copolymer, biomass polyurethane and biomass epoxy resin, the nano-particles and the biomass-based polymer form a multi-scale enhancing system, and the nano-particles enhance the mechanical properties of the asphalt in a micro scale; the biomass-based polymer improves the elasticity and toughness of the asphalt in a macroscopic scale, and the comprehensive performance of the modified asphalt is remarkably improved through the synergistic effect of the two.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering materials technology, specifically to warm-mix modified asphalt reinforced with nanoparticles and polymers and its applications. Background Technology

[0002] Asphalt, as a core material for road and waterproofing projects, plays an irreplaceable role in infrastructure construction. However, the mixing and construction temperature of traditional asphalt mixtures is usually as high as 160-180℃, which has problems such as high energy consumption, high pollutant emissions, and harsh construction conditions. With increasingly stringent environmental protection requirements and the advancement of the "dual carbon" target, the development of energy-saving and environmentally friendly warm-mix asphalt technology has become an important trend in the industry. Warm-mix asphalt technology, with the help of warm-mix agents, can reduce the construction temperature by 20-40℃, significantly reducing energy consumption and harmful gas emissions. However, existing technologies still face the following key problems: the viscosity of asphalt increases after cooling, which weakens the bonding performance with aggregates and affects road performance; a single modifier is difficult to meet the requirements of high-temperature stability and low-temperature crack resistance; traditional petroleum-based modifiers are not environmentally friendly enough and do not conform to the concept of sustainable development; and nanomaterials are prone to agglomeration in asphalt, with poor dispersibility, which limits their modification effect. Therefore, the development of warm-mix modified asphalt reinforced with nanoparticles and polymers and its applications are needed. Summary of the Invention

[0003] The purpose of this invention is to provide warm-mix modified asphalt reinforced with nanoparticles and polymers and its applications.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising the following components by weight: Base asphalt: 60-80 parts; Biomass-based polymers: 5-15 parts; Nanoparticles: 2-8 parts; Warm mixing agent: 1-5 parts; Silane coupling agent: 0.5-3 parts; The biomass-based polymer is selected from one of biomass-modified styrene-butadiene-styrene block copolymer, biomass polyurethane, and biomass epoxy resin. The biomass-based polymer is derived from renewable biomass resources and obtained through chemical modification. It has good environmental friendliness and compatibility with asphalt, and can significantly improve the high-temperature stability and low-temperature flexibility of asphalt.

[0005] The nanoparticles are selected from one of nano-silica, nano-titanium dioxide, nano-calcium carbonate, and nano-zinc oxide, with a particle size of 10-80 nanometers. The nanoparticles have high specific surface area and surface activity, and can form a physical cross-linking network in the asphalt system, thereby enhancing the mechanical properties and durability of the asphalt.

[0006] The warm mix agent is selected from one of the following: organic amine warm mix agents, surfactant warm mix agents, and wax warm mix agents. Its function is to reduce the viscosity and construction temperature of asphalt while maintaining good workability.

[0007] The silane coupling agent, as a surface modifier and compatibilizer, can improve the surface properties of nanoparticles, enhance their dispersibility in asphalt, and strengthen the interfacial bonding between components.

[0008] The base asphalt has a penetration of 60-80 (25℃, 100g, 5 seconds), a softening point of 45-52℃, and a ductility greater than 100cm (15℃).

[0009] As a further aspect of the present invention, the weight proportions of each component are as follows: 70 parts of base asphalt, 10 parts of biomass-based polymer, 5 parts of nanoparticles, 3 parts of warm mix agent, and 1.5 parts of silane coupling agent.

[0010] This invention also provides a method for preparing the above-mentioned warm-mix modified asphalt, comprising the following steps: Step S1: Heat the base asphalt to 160-180℃ and maintain a constant temperature to make the asphalt flow. Step S2: Under a shear rate of 3000-5000 rpm, nanoparticles and silane coupling agent are added to the base asphalt and sheared and dispersed for 30-50 minutes to ensure uniform dispersion of nanoparticles and surface modification. Step S3: Add biomass-based polymer to the material obtained in step S2, and shear and mix for 40-60 minutes at a shear rate of 4000-6000 rpm to allow the polymer to fully swell and form a stable blend system with the asphalt. Step S4: Add warm mix agent to the material obtained in step S3, and mix for 20-30 minutes at a shear rate of 2000-3000 rpm to ensure uniform dispersion of the warm mix agent and obtain warm mix modified asphalt. In step S2, the weight ratio of silane coupling agent to nanoparticles is 1:3 to 1:6. The silane coupling agent can react with the hydroxyl groups on the surface of the nanoparticles to form an organic coating layer on the surface of the nanoparticles, thereby improving their oleophilicity and dispersibility. In step S3, the addition temperature of the biomass-based polymer is controlled at 165-175℃. This temperature range can ensure the swelling and dispersion of the polymer, while avoiding polymer degradation caused by excessively high temperatures.

[0011] This invention also provides the application of the above-mentioned warm-mix modified asphalt in road engineering, which can be used for the surface layer and bonding layer construction of road engineering such as highways, urban roads, and airport runways.

[0012] This invention also provides the application of the above-mentioned warm-mix modified bitumen in building waterproofing projects, which can be used for roof waterproofing, underground waterproofing, bridge waterproofing and other projects.

[0013] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows: 1. Significant synergistic enhancement effect: Nanoparticles and biomass-based polymers form a multi-scale enhancement system. Nanoparticles enhance the mechanical properties of asphalt at the microscale, while biomass-based polymers improve the elasticity and toughness of asphalt at the macroscale. The synergistic effect of the two significantly improves the overall performance of modified asphalt.

[0014] 2. Significantly reduced construction temperature: Through the action of warm mix agent, the construction temperature can be reduced by 30-50℃, the mixing temperature can be reduced to 120-140℃, and the paving temperature can be reduced to 110-130℃, effectively reducing energy consumption and pollutant emissions and improving the construction environment.

[0015] 3. Excellent high-temperature stability: The softening point of modified asphalt can be increased by 15-25℃, the dynamic viscosity at 60℃ can be increased by 2-3 times, and the high-temperature rutting resistance is significantly enhanced, which can meet the requirements of heavy traffic and high-temperature areas.

[0016] 4. Excellent low-temperature crack resistance: Biomass-based polymers give asphalt good elastic recovery ability. The ductility of modified asphalt at 5℃ can reach more than 30cm, and the low-temperature bending strain capacity is increased by more than 40%, effectively preventing low-temperature cracking.

[0017] 5. Uniform dispersion of nanoparticles: The surface of nanoparticles is modified by using silane coupling agents and combined with high-speed shearing process, which solves the problem of easy agglomeration of nanoparticles. The nanoparticles have good dispersibility and stability in asphalt.

[0018] 6. Outstanding environmental performance: Biomass-based polymers are derived from renewable resources, which is in line with the concept of sustainable development; warm mix technology reduces construction temperature, reduces emissions of volatile organic compounds and greenhouse gases, and is significantly environmentally friendly.

[0019] 7. Enhanced durability: The addition of nanoparticles enhances the asphalt's resistance to ultraviolet radiation and oxidation, significantly improving the aging performance of the modified asphalt and extending its service life.

[0020] 8. Simple and feasible process: The preparation process uses conventional shearing and mixing equipment, requiring no special devices. The process parameters are easy to control, making it suitable for industrial production and widespread application. Attached Figure Description

[0021] Figure 1 This is a flow chart of the preparation process of the warm-mix modified asphalt of the present invention; Figure 2 This is a schematic diagram illustrating the component interactions of the warm-mix modified asphalt of this invention. Figure 3 This is a schematic diagram of the surface modification mechanism of nanoparticles in this invention; Figure 4 This is a schematic diagram of the multi-scale reinforcement structure of the warm-mix modified asphalt of the present invention. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 The specific embodiments of the present invention will be further described below. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0023] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] A warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising the following components by weight: Base bitumen (penetration 70, softening point 48℃): 70 parts; Biomass-modified SBS (star structure, 30% biomass content): 10 parts; Nano-silica (particle size 20 nm): 5 parts; Organic amine warm mix agent: 3 parts; Aminosilane coupling agent: 1.5 parts.

[0025] The preparation method is as follows: Step S1: Heat 70 parts of base asphalt to 170°C and maintain the temperature for 30 minutes to ensure that the asphalt is completely melted and reaches a uniform flow state; Step S2: Under high-speed shearing conditions of 4000 rpm, 1.5 parts of aminosilane coupling agent and 5 parts of nano silica were added to the base asphalt in sequence, and sheared and dispersed for 40 minutes. During this process, the aminosilane coupling agent reacted with the silanol groups on the surface of nano silica to form chemical bonds, and at the same time, organic segments were coated on the surface of nanoparticles to improve their oleophilicity. Step S3: Add 10 parts of biomass modified SBS to the material obtained in step S2, increase the shear rate to 5000 rpm, continue shearing and mixing for 50 minutes, and keep the temperature at 170℃. Under high-speed shearing, the biomass modified SBS gradually swells and forms a stable two-phase structure with the asphalt, in which the SBS forms a continuous network phase to provide elastic support. Step S4: Reduce the shear rate to 2500 rpm, add 3 parts of organic amine warm mix agent to the material obtained in step S3, mix for 25 minutes to obtain warm mix modified asphalt. The warm mix agent forms a fine lubricating layer in the asphalt, reducing the frictional resistance between the asphalt and the aggregate.

[0026] The performance test results are as follows: Penetration (25℃): 52; Softening point: 71℃; Ductility (5℃): 32cm; Dynamic viscosity at 60℃: 245,000 Pa·s; Mixing temperature: 135℃; Paving temperature: 125℃; Difference in softening point before and after aging: 5℃; Mass loss before and after aging: 0.3%; Example 2

[0027] A warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising the following components by weight: Base bitumen (penetration 65, softening point 50℃): 75 parts; Biomass polyurethane (soft segment is biomass polyol): 8 parts; Nano titanium dioxide (30 nm particle size): 4 parts; Surfactant-based warm mix agent: 2 parts; Vinylsilane coupling agent: 1 part; The preparation method is as follows: Step S1: Heat 75 parts of base bitumen to 165°C and maintain the temperature for 30 minutes; Step S2: Under high-speed shearing conditions of 3500 rpm, add 1 part of vinyl silane coupling agent and 4 parts of nano titanium dioxide to the matrix asphalt in sequence, and shear and disperse for 35 minutes. Step S3: Add 8 parts of biomass polyurethane to the material obtained in step S2, increase the shear rate to 4500 rpm, continue shearing and mixing for 45 minutes, and keep the temperature at 168℃. The urethane groups in the biomass polyurethane will form hydrogen bonds with the polar components in the asphalt, thereby enhancing the interfacial bonding. Step S4: Reduce the shear rate to 2200 rpm, add 2 parts of surfactant-based warm mix agent to the material obtained in step S3, mix for 22 minutes to obtain warm mix modified asphalt.

[0028] The performance test results are as follows: Penetration (25℃): 48; Softening point: 68℃; Ductility (5℃): 28cm; Dynamic viscosity at 60℃: 218,000 Pa·s; Mixing temperature: 130℃; Paving temperature: 120℃; Difference in softening point before and after aging: 6℃; Mass loss before and after aging: 0.4%; Example 3

[0029] A warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising the following components by weight: Base bitumen (penetration 75, softening point 46℃): 65 parts; Biomass epoxy resin (epoxy value 0.45): 12 parts; Nano-sized calcium carbonate (50 nm particle size): 6 parts; Wax-based warm mixing agent: 4 parts; Methacryloxysilane coupling agent: 2 parts; The preparation method is as follows: Step S1: Heat 65 parts of base bitumen to 175°C and maintain the temperature for 30 minutes; Step S2: Under high-speed shearing conditions of 4500 rpm, 2 parts of methacryloxysilane coupling agent and 6 parts of nano calcium carbonate were added to the matrix asphalt in sequence, and sheared and dispersed for 45 minutes. Step S3: Add 12 parts of biomass epoxy resin to the material obtained in step S2, increase the shear rate to 5500 rpm, continue shearing and mixing for 55 minutes, and keep the temperature at 173°C. The epoxy groups in the biomass epoxy resin can react with the carboxyl groups and other active groups in the asphalt to form a cross-linked structure. Step S4: Reduce the shear rate to 2800 rpm, add 4 parts of wax-based warm mix agent to the material obtained in step S3, mix for 28 minutes to obtain warm mix modified asphalt.

[0030] The performance test results are as follows: Penetration (25℃): 45; Softening point: 73℃; Ductility (5℃): 35cm; Dynamic viscosity at 60℃: 268,000 Pa·s; Mixing temperature: 138℃; Paving temperature: 128℃; Difference in softening point before and after aging: 4℃; Mass loss before and after aging: 0.2%; Example 4

[0031] A warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising the following components by weight: Base bitumen (penetration 68, softening point 49℃): 72 parts; Biomass-modified SBS (linear structure, 25% biomass content): 9 parts; Nano zinc oxide (40 nm particle size): 3 parts; Organic amine warm mix agent: 2.5 parts; Epoxy silane coupling agent: 1.2 parts; The preparation method is as follows: Step S1: Heat 72 parts of base bitumen to 168°C and maintain the temperature for 30 minutes; Step S2: Under high-speed shearing conditions of 3800 rpm, 1.2 parts of epoxy silane coupling agent and 3 parts of nano zinc oxide were added to the base asphalt in sequence, and sheared and dispersed for 38 minutes. Step S3: Add 9 parts of biomass modified SBS to the material obtained in step S2, increase the shear rate to 4800 rpm, continue shearing and mixing for 48 minutes, and keep the temperature at 169℃. Step S4: Reduce the shear rate to 2400 rpm, add 2.5 parts of organic amine warm mix agent to the material obtained in step S3, mix for 24 minutes to obtain warm mix modified asphalt.

[0032] The performance test results are as follows: Penetration (25℃): 50; Softening point: 69℃; Ductility (5℃): 30cm; Dynamic viscosity at 60℃: 232,000 Pa·s; Mixing temperature: 133℃; Paving temperature: 123℃; Difference in softening point before and after aging: 5℃; Mass loss before and after aging: 0.3%; Mechanism of action analysis The superior performance of the warm-mix modified asphalt of this invention is mainly attributed to the following mechanism of action: 1. Enhancement mechanism of nanoparticles Nanoparticles possess high specific surface area and surface activity, and play the following roles in asphalt: (1) Physical filling effect: Nanoparticles fill the micropores and defects of asphalt, improving the density and mechanical strength of asphalt; (2) Adsorption enhancement effect: The polar components in asphalt are adsorbed on the surface of nanoparticles to form an adsorption layer, which enhances the interfacial bonding between the particles and the asphalt matrix; (3) Network enhancement effect: Uniformly dispersed nanoparticles form a three-dimensional physical network in asphalt, which restricts the flow of asphalt molecules and improves high-temperature stability; (4) Anti-aging effect: Nanoparticles such as nano-titanium dioxide with photocatalytic activity can absorb ultraviolet light and slow down the photoaging of asphalt; nanoparticles can also block the diffusion of oxygen and delay oxidative aging.

[0033] 2. Interfacial Modification Mechanism of Silane Coupling Agents The alkoxy group at one end of the silane coupling agent molecule undergoes a hydrolytic condensation reaction with the hydroxyl groups on the surface of the nanoparticles to form a stable silicon-oxygen bond. The organic functional group at the other end is compatible with the asphalt, forming an organic coating layer on the surface of the nanoparticles. This surface modification brings the following effects: (1) Improve the oleophilicity of nanoparticles and enhance their wettability and dispersibility in asphalt; (2) Reduce the surface energy of nanoparticles, reduce the van der Waals forces between particles, and inhibit aggregation; (3) Enhance the interfacial bonding force between nanoparticles and asphalt matrix, and improve stress transfer efficiency.

[0034] The effect of silane coupling agents can be characterized by the increase in interfacial bonding energy. Let the interfacial bonding energies between nanoparticles and asphalt before and after modification be respectively... and The interface bonding energy improvement rate is: ; in, To improve efficiency, the interface integration can be improved. The unit is the interfacial bonding energy before modification, expressed in joules per square meter. The value represents the interfacial bonding energy after modification, expressed in joules per square meter.

[0035] Tests have shown that the interfacial bonding energy can be improved by more than 60% after modification with silane coupling agents.

[0036] 3. Modification mechanism of biomass-based polymers Biomass-based polymers form continuous or semi-continuous network phases in asphalt, playing the following roles: (1) Elastic enhancement: The long-chain molecules of the polymer provide elastic support, improving the elastic recovery ability and fatigue resistance of asphalt; (2) Compatibility enhancement: Biomass-based polymers and asphalt have good compatibility and can form a stable blend system, avoiding phase separation; (3) Temperature sensitivity control: The glass transition temperature of polymers affects the temperature sensitivity of asphalt. Reasonable selection of polymers can broaden the service temperature range of asphalt. (4) Environmental characteristics: Biomass-based polymers are derived from renewable resources, which reduces dependence on petroleum resources and is in line with the concept of green development.

[0037] 4. Mechanism of action of warm mixing agents The functions of warm mix additives in asphalt include: (1) Reduce asphalt viscosity: The molecules of warm mix additive form a fine dispersed phase in the asphalt, which destroys the interaction between asphalt molecules and reduces the viscosity of the system; (2) Improved lubricity: The warm mix agent forms a lubricating layer at the interface between asphalt and aggregate, reducing frictional resistance and improving workability; (3) Promote asphalt-aggregate adhesion: Some warm mix additives have surface activity, which can promote the wetting and adhesion of asphalt to aggregates.

[0038] The reduction in asphalt viscosity can be characterized by warm mix efficiency: ; in, To improve the efficiency of warm mixing, The viscosity of the base asphalt at a certain temperature is expressed in Pascals per second (Pa·s). Viscosity of warm-mix modified asphalt at the same temperature, expressed in Pa·s.

[0039] The warm-mix modified asphalt of this invention can achieve a warm-mix efficiency of over 40% at 140℃.

[0040] 5. Multi-component synergistic enhancement mechanism Nanoparticles, biomass-based polymers, warm mix additives, and silane coupling agents form a multi-scale, multifunctional composite system in asphalt, with synergistic effects among the components: (1) Synergy between nanoparticles and polymers: Nanoparticles enhance the stiffness and strength of asphalt, while polymers improve the toughness and elasticity of asphalt. The combination of the two achieves a balance between rigidity and flexibility. (2) Synergistic effect of silane coupling agent and nanoparticles: The coupling agent improves the dispersibility of nanoparticles, so that the reinforcing effect can be fully utilized; (3) Synergy between warm mix agent and modified system: warm mix agent reduces construction temperature, while modified system ensures that the performance of asphalt does not decrease after cooling.

[0041] This multi-component synergistic enhancement enables the warm-mix modified asphalt of this invention to maintain a low construction temperature while exhibiting superior road performance compared to traditional hot-mix modified asphalt.

[0042] Application Examples Example 5: Road Engineering Application The warm-mix modified asphalt prepared in Example 1 was applied to the surface layer construction of a highway pavement project. The mix proportion of AC-13 asphalt mixture was used, and the warm-mix modified asphalt content was 5.8%. The construction parameters are as follows: Mixing temperature: 135℃; Paving temperature: 125℃; Compaction temperature: 115℃; Open traffic temperature: 65℃; During construction, the mixture exhibits good workability and easily achieves the design requirements for compaction. Compared with traditional hot-mix asphalt mixtures, energy consumption is reduced by about 25%, asphalt fume emissions are reduced by about 60%, and the construction environment is significantly improved.

[0043] After the road surface was paved, performance tests were conducted, and the results are as follows: Rutting test (60℃, 1 hour): Dynamic stability 8500 cycles per millimeter; Low-temperature bending test (-10℃): failure strain 3800 microstrain; Freeze-thaw splitting strength ratio: 89%; Permeability coefficient: 32 ml / min; Construction depth: 0.82 mm; All indicators meet the requirements of the technical specifications for highway pavement construction, with rutting dynamic stability and low-temperature bending strain significantly exceeding the specifications.

[0044] Example 6: Building Waterproofing Application The warm-mix modified bitumen prepared in Example 2 was applied to a building roof waterproofing project to prepare modified bitumen waterproof membrane. The process parameters are as follows: Base fabric: Polyester felt; Coating temperature: 140℃; Coating amount: 1.5 kg per square meter on one side; Covering material: fine sand.

[0045] The performance test results of the waterproof membrane are as follows: Tensile force (longitudinal): 850 Newtons per 50 millimeters; Elongation at maximum tensile force: 45%; Heat resistance: No flow, sliding, or dripping at 100℃; Flexible (-25℃): No cracks; Impermeability (0.3 MPa, 120 minutes): Impermeable; Oil seepage: No oil seepage.

[0046] All performance indicators meet the national standard requirements for elastomeric modified bitumen waterproof membranes, with particularly outstanding heat resistance and low-temperature flexibility.

[0047] Comparative Example Comparative Example 1: No nanoparticles added Following the formulation of Example 1, without adding nano-silica and silane coupling agent, and with the remaining components and preparation method being the same, comparative asphalt sample 1 was obtained.

[0048] The performance test results are as follows: Penetration (25℃): 58; Softening point: 65℃; Ductility (5℃): 28cm; Dynamic viscosity at 60℃: 185,000 Pa·s; The difference in softening point before and after aging: 9℃.

[0049] As can be seen from the comparison, without the addition of nanoparticles, the high-temperature stability (softening point, dynamic viscosity) of asphalt is significantly reduced, and its anti-aging performance (difference in softening point before and after aging) deteriorates.

[0050] Comparative Example 2: No biomass-based polymers added Following the formulation of Example 1, without adding biomass-modified SBS, and with the other components and preparation method being the same, comparative asphalt sample 2 was obtained.

[0051] The performance test results are as follows: Penetration (25℃): 48; Softening point: 59℃; Ductility (5℃): 18cm; Dynamic viscosity at 60℃: 215,000 Pa·s; The difference in softening point before and after aging: 7℃.

[0052] As can be seen from the comparison, without the addition of biomass-based polymers, the softening point of asphalt is significantly reduced, its low-temperature performance (ductility) deteriorates significantly, and its elastic recovery ability is insufficient.

[0053] Comparative Example 3: No silane coupling agent used Following the formulation of Example 1, without adding aminosilane coupling agent, nano-silica was directly added, and the remaining components and preparation method were the same, resulting in comparative asphalt sample 3.

[0054] The performance test results are as follows: Penetration (25℃): 54; Softening point: 68℃; Ductility (5℃): 29cm; Dynamic viscosity at 60℃: 208,000 Pa·s; The difference in softening point before and after aging: 6℃.

[0055] As can be seen from the comparison, when no silane coupling agent is used, the dispersibility of nanoparticles deteriorates, the reinforcing effect weakens, and all properties of asphalt decrease.

[0056] The above comparison shows that the components of nanoparticles, biomass-based polymers, and silane coupling agents are all indispensable in this invention. They have a synergistic enhancement effect, which together ensures the excellent performance of warm-mix modified asphalt.

[0057] Test Method Description The performance testing methods involved in the above embodiments and comparative examples are as follows: Penetration: The penetration was determined according to GB / T 4509 "Determination of Penetration of Asphalt", with test conditions of 25℃, 100g, and 5 seconds. Softening point: Determined according to GB / T 4507 "Determination of softening point of bitumen - Ring and ball method"; Ductility: The test was conducted according to GB / T 4508 "Determination of Ductility of Asphalt", with a test temperature of 5℃ and a tensile speed of 5cm per minute. Dynamic viscosity: The dynamic viscosity was determined according to the rotational viscometer method in JTG E20 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" at a test temperature of 60℃. Aging performance: Aging treatment was carried out according to GB / T 0610 "Asphalt Rotating Film Heating Test", and the softening point and mass loss before and after aging were measured. Rutting test: Conducted according to the method in JTG E20, with a test temperature of 60℃ and a test time of 1 hour; Low-temperature bending test: The test was conducted according to the method in JTG E20, using a small beam bending test, and the test temperature was -10℃. Freeze-thaw splitting test: Performed according to the method in JTG E20; Waterproof membrane performance: Tested according to the methods in GB / T 18242 "Elastomer Modified Bituminous Waterproof Membranes".

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A warm-mix modified asphalt reinforced with nanoparticles and polymers, comprising warm-mix modified asphalt, characterized in that: The warm-mix modified asphalt comprises the following components by weight: Base bitumen: 60-80 parts; Biomass-based polymers: 5-15 parts; Nanoparticles: 2-8 parts; Warm mixing agent: 1-5 parts; Silane coupling agent: 0.5-3 parts; The biomass-based polymer is selected from one of the following: biomass-modified styrene-butadiene-styrene block copolymer, biomass polyurethane, and biomass epoxy resin.

2. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 1, characterized in that: The nanoparticles are selected from one of nano-silica, nano-titanium dioxide, nano-calcium carbonate, and nano-zinc oxide.

3. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 2, characterized in that: The nanoparticles have a particle size of 10-80 nanometers.

4. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 3, characterized in that: The warm mix agent is selected from one of the following: organic amine warm mix agents, surfactant warm mix agents, and wax warm mix agents.

5. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 4, characterized in that: The base asphalt has a penetration of 60-80 and a softening point of 45-52℃.

6. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 5, characterized in that: The modified asphalt is prepared by the following method: Step S1: Heat the base asphalt to 160-180℃ and maintain a constant temperature; Step S2: Under a shear rate of 3000-5000 rpm, nanoparticles and silane coupling agent are added to the matrix asphalt and sheared and dispersed for 30-50 minutes. Step S3: Add biomass-based polymer to the material obtained in step S2, and shear and mix for 40-60 minutes at a shear rate of 4000-6000 rpm; Step S4: Add warm mix agent to the material obtained in step S3, and mix for 20-30 minutes at a shear rate of 2000-3000 rpm to obtain warm mix modified asphalt.

7. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 6 and its application, characterized in that: In step S2, the weight ratio of silane coupling agent to nanoparticles is 1:3 to 1:

6.

8. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 7 and its application, characterized in that: The addition temperature of the biomass-based polymer in step S3 is 165-175℃.

9. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 8, characterized in that: The application of warm-mix modified asphalt in road engineering.

10. The warm-mix modified asphalt reinforced with nanoparticles and polymers according to claim 9, characterized in that: The application of warm-mix modified asphalt in building waterproofing projects.

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