Composite pavement phase change material, preparation method and application thereof

Abstract

The application relates to the technical field of road engineering construction, and particularly discloses a composite road surface phase change material and a preparation method and application thereof. The composite road surface phase change material comprises a cellulose aerogel base material, a phase change core material impregnated in pores of the base material and an outer coating layer material; wherein the phase change core material comprises expanded graphite, lauric acid / myristic acid eutectic and polyethylene glycol; and the outer coating layer material is a mixture of petroleum resin and maleic anhydride modified asphalt. The composite road surface phase change material can play a significant temperature control role in the asphalt pavement, improve the high and low temperature performance of the asphalt pavement mixture, effectively prolong the service life of the road surface, and effectively make up for the defects of the prior art.

Description

Technical Field

[0001] This invention relates to the field of road engineering construction technology, and in particular to a composite pavement phase change material, its preparation method, and its application. Background Technology

[0002] Asphalt pavement is a key component of modern transportation infrastructure, widely used in roads, bridges, airports, and other fields. With the continuous increase in traffic volume and temperature fluctuations caused by climate change, asphalt pavement faces a series of performance problems that directly affect the durability, safety, and service life of roads. Especially under high and low temperature conditions, asphalt pavement exhibits defects such as rutting, cracking, and aging, severely impacting road performance and maintenance costs.

[0003] High-temperature rutting occurs when asphalt softens under high temperatures, leading to permanent deformation of the pavement under vehicle loads, affecting its smoothness and safety. Simultaneously, low temperatures cause asphalt to become brittle, resulting in cracks and further exacerbating moisture intrusion, ultimately damaging the roadbed. Furthermore, diurnal temperature variations and seasonal changes cause temperature fluctuations in asphalt pavements, leading to thermal expansion and contraction, which can easily cause thermal fatigue cracks over time. Traditional asphalt pavement modification methods, such as polymer modification and anti-rutting additives, can improve the high-temperature and low-temperature performance of asphalt to some extent, but their passive adaptation mechanism to temperature changes cannot completely solve the problems caused by temperature fluctuations. Therefore, designing a technology for actively regulating temperature is particularly important.

[0004] Phase change materials (PCMs) possess phase change heat storage properties, enabling them to absorb or release significant amounts of latent heat during temperature changes, effectively regulating the surrounding environment's temperature. Adding PCMs to asphalt pavements provides a thermal buffer. In high-temperature environments, PCMs can absorb excess heat, preventing excessive asphalt softening and reducing rutting. In low-temperature environments, PCMs can release stored heat, improving the asphalt's low-temperature toughness and effectively mitigating low-temperature cracking.

[0005] However, the direct application of phase change materials (PCMs) to asphalt mixtures also presents some challenges. Composite PCMs typically have poor thermal conductivity, potentially leading to localized overheating or slow temperature equalization in the pavement, thus affecting their temperature control performance. In asphalt pavements, good thermal diffusivity is crucial to ensure rapid response to temperature changes. Furthermore, the poor compatibility between asphalt and PCMs can cause phase separation or uneven dispersion during mixing, impacting the overall performance of the asphalt mixture. The PCMs may also exhibit low adhesion to asphalt, reducing the adhesion between asphalt and aggregates, thereby affecting pavement durability and rutting resistance.

[0006] Therefore, developing an asphalt mixture with good compatibility, good thermal conductivity, and stable performance is of great significance for promoting the road construction field. Summary of the Invention

[0007] In view of this, the present invention provides a composite pavement phase change material, its preparation method, and its application. The composite pavement phase change material comprises a cellulose aerogel substrate, a phase change core material impregnated in the pores of the substrate, and an outer coating material; wherein the phase change core material comprises expanded graphite, lauric acid / myristic acid eutectic, and polyethylene glycol; and the outer coating material is a mixture of petroleum resin and maleic anhydride modified asphalt. The composite pavement phase change material can exert a significant temperature control effect in asphalt pavements, improve the high and low temperature performance of asphalt pavement mixtures, and effectively extend the service life of the pavement, effectively overcoming the shortcomings of existing technologies.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0009] The first aspect of the present invention provides a composite pavement phase change material, comprising a cellulose aerogel substrate, a phase change core material impregnated in the pores of the cellulose aerogel substrate, and an outer coating material covering the surface of the cellulose aerogel substrate; wherein the phase change core material comprises expanded graphite, lauric acid / myristic acid eutectic and polyethylene glycol; and the outer coating material is a mixture of petroleum resin and maleic anhydride modified asphalt.

[0010] Compared to existing technologies, this invention provides a composite pavement phase change material with a cellulose aerogel substrate as the supporting framework, providing a porous structure that ensures the morphological stability of the composite pavement phase change material. Expanded graphite, lauric acid / myristic acid eutectic, and polyethylene glycol are used as the phase change core material, giving the composite pavement phase change material different phase change temperatures and latent heat characteristics, enabling heat storage and release during temperature fluctuations. When the ambient temperature rises, the lauric acid / myristic acid eutectic and polyethylene glycol in the phase change core material absorb heat and undergo a solid-liquid phase change process, thereby reducing the temperature of the asphalt surface and preventing high-temperature rutting. When the temperature drops, the lauric acid / myristic acid eutectic and polyethylene glycol in the phase change core material release the stored heat, alleviating the embrittlement of asphalt in low-temperature environments and reducing the occurrence of low-temperature cracks. Furthermore, the expanded graphite in the phase change core material acts as a thermally conductive filler, effectively improving the thermal conductivity of the composite phase change material, shortening the thermal response time, and accelerating temperature equalization.

[0011] The outer coating material, composed of a mixture of petroleum resin and maleic anhydride-modified asphalt, enhances the compatibility between the phase change material (PCM) and asphalt, prevents PCM leakage, and improves the adhesion and durability of the composite pavement PCM to asphalt. Furthermore, the composite PCM forms a barrier through its outer coating, preventing the intrusion of moisture and air, reducing oxidation reactions, and improving the oxidation resistance and aging resistance of the asphalt. More importantly, the composite pavement PCM provided by this invention uses readily available and environmentally friendly raw materials, meeting green and environmental protection requirements while improving asphalt pavement performance.

[0012] Preferably, the cellulose aerogel substrate has a pore volume of 0.8–1.5 cm. 3 / g.

[0013] Preferably, the phase change core material comprises the following raw material components in parts by mass: 3-5 parts expanded graphite, 5-10 parts lauric acid / myristic acid eutectic and 5-8 parts polyethylene glycol.

[0014] Preferably, the outer coating material comprises petroleum resin and maleic anhydride modified asphalt in a mass ratio of 1:3 to 1:5.

[0015] A second aspect of the present invention provides a method for preparing the composite pavement phase change material, comprising the following steps:

[0016] S1, cellulose powder is dispersed in an alkaline solution, and a crosslinking agent is added to carry out a gelation reaction to obtain an aerogel precursor;

[0017] S2, freeze-dry the aerogel precursor to obtain cellulose aerogel;

[0018] S3, weigh lauric acid / myristic acid eutectic and polyethylene glycol according to the design ratio, mix them, heat and melt them, and then add expanded graphite to obtain phase change mixed material;

[0019] S4, the cellulose aerogel is added to the phase change mixture, and vacuum impregnation is performed under a vacuum degree of 0.07-0.08 MPa, followed by cooling and granulation to obtain phase change material particles;

[0020] S5, maleic anhydride modified asphalt is heated to 150-170℃, petroleum resin is added according to the design ratio, and mixed evenly to obtain the outer coating material.

[0021] S6, the phase change material particles are immersed in an alcohol solution of silane coupling agent for surface activation, and then immersed in the outer coating material. Solid-liquid separation and curing are performed to obtain a composite pavement phase change material.

[0022] Preferably, in S1, the mass-to-volume ratio of the cellulose powder to the alkaline solution is 1g:3mL to 1g:5mL; wherein the alkaline solution is a 0.1-0.3mol / L sodium hydroxide solution.

[0023] Preferably, in S1, the crosslinking agent is an aqueous ammonia solution of 0.1 to 0.2 mol / L.

[0024] Preferably, in S1, the volume ratio of the crosslinking agent to the alkaline solution is 1:6 to 1:8.

[0025] Preferably, in S1, the temperature of the gelation reaction is 60-80°C, and the time of the gelation reaction is 6-8 hours.

[0026] Preferably, in S2, the freeze-drying temperature is -40 to -20°C, and the freeze-drying time is 24 to 30 hours.

[0027] Preferably, in S3, the preparation method of the lauric acid / myristic acid eutectic includes the following steps: weighing lauric acid and myristic acid in a molar ratio of 1:1 to 3:1, mixing, heating to melt, and slowly cooling at a rate of 1 to 2 °C / min to obtain the lauric acid / myristic acid eutectic.

[0028] Lauric acid and myristic acid, as natural organic acids, have good chemical and thermal stability. In particular, during repeated phase transitions, the chemical structure of the lauric acid / myristic acid eutectic is relatively stable, and it can maintain good phase transition performance during long-term use. In addition, the phase transition temperature of the lauric acid / myristic acid eutectic material is not easily affected by changes in the external environment, making it a highly stable phase transition material.

[0029] Preferably, in step S4, the vacuum impregnation temperature is 50–60°C, and the vacuum impregnation time is 1–2 hours.

[0030] Preferably, in step S5, the preparation method of the maleic anhydride modified asphalt includes the following steps: heating the asphalt to 160-180°C, adding maleic anhydride and an initiator, and then heating to 180-200°C to carry out a modification reaction to obtain maleic anhydride modified asphalt.

[0031] Maleic anhydride-modified asphalt introduces maleic anhydride groups, which increase polar groups in the asphalt molecular chain. These polar groups can form physical bonding forces such as hydrogen bonds, van der Waals forces, or dipole interactions with lauric acid / myristic acid eutectic or polyethylene glycol in the phase change material, thereby enhancing the compatibility between asphalt and phase change materials.

[0032] More preferably, the mass ratio of maleic anhydride to asphalt is 0.1:1 to 0.2:1.

[0033] More preferably, the initiator is dicumyl peroxide.

[0034] More preferably, the amount of the initiator added is 0.1% to 0.5% of the mass of the asphalt.

[0035] More preferably, the modification reaction takes 30 to 50 minutes.

[0036] Preferably, the petroleum resin is C9 petroleum resin.

[0037] Petroleum resins can enhance the ductility of asphalt, reduce cracks caused by heat-cold cycles, and to some extent improve the fatigue resistance of composite materials, thus extending the service life of asphalt pavement materials.

[0038] Preferably, in step S6, the mass-to-volume ratio of the phase change material particles to the alcohol solution of the silane coupling agent is 1g:5mL to 1g:8mL; wherein the mass percentage of the silane coupling agent in the alcohol solution of the silane coupling agent is 35% to 45%.

[0039] More preferably, the silane coupling agent is KH550.

[0040] Preferably, in step S6, the surface activation temperature is 40–50°C, and the surface activation time is 2–3 hours.

[0041] Preferably, in S6, the mass ratio of the phase change material particles to the outer coating material is 1:5 to 1:7.

[0042] Preferably, in step S6, the curing temperature is 120-130℃, and the curing time is 2-3 hours.

[0043] A third aspect of the present invention provides an asphalt-based pavement material, including the composite pavement phase change material.

[0044] The fourth aspect of this invention provides the application of the asphalt-based pavement material in the field of road engineering construction.

[0045] In summary, the composite pavement phase change material provided by this invention can not only improve the high and low temperature performance of asphalt pavement through phase change temperature regulation, but also effectively delay the aging of asphalt materials and extend the service life of asphalt pavement materials by controlling temperature changes, thereby reducing maintenance and repair costs, and providing new design ideas for the development of asphalt pavement materials. Detailed Implementation

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The preparation methods of the lauric acid / myristic acid eutectic used in the following embodiments and comparative examples include the following steps: lauric acid and myristic acid are weighed in a molar ratio of 1:1, mixed, heated to melt, and slowly cooled at a rate of 2°C / min to obtain the lauric acid / myristic acid eutectic.

[0048] The preparation methods of maleic anhydride modified bitumen used in the following embodiments and comparative examples include the following steps:

[0049] 500g of asphalt was heated to 170℃, 80g of maleic anhydride and 1.5g of dicumyl peroxide were added, and the temperature was then raised to 190℃ for a modification reaction of 35 minutes to obtain maleic anhydride modified asphalt.

[0050] Example 1

[0051] This embodiment provides a composite pavement phase change material, specifically comprising the following: a cellulose aerogel substrate, a phase change core material impregnated in the pores of the substrate, and an outer coating material; wherein, the phase change core material comprises the following raw material components in parts by mass: 40g expanded graphite, 60g lauric acid / myristic acid eutectic, and 60g polyethylene glycol; the outer coating material is a mixture of 20g petroleum resin and 80g maleic anhydride modified asphalt.

[0052] The preparation method of the composite pavement phase change material includes the following steps:

[0053] S1, 200g of cellulose powder was dispersed in 800mL of 0.2mol / L sodium hydroxide solution, 120mL of 0.2mol / L ammonia solution was added, the mixture was mixed evenly, and the gelation reaction was carried out at 70℃ for 7h to obtain the aerogel precursor;

[0054] S2, the aerogel precursor is cooled to -30℃ and freeze-dried for 28 hours to obtain a pore volume of 1.3 cm³. 3 / g of cellulose aerogel;

[0055] S3, weigh lauric acid / myristic acid eutectic and polyethylene glycol according to the design ratio, mix, heat to melt, and then add expanded graphite to obtain a fluid phase change hybrid material;

[0056] S4, the cellulose aerogel is added to the phase change mixture, and vacuum impregnation is performed at a vacuum degree of 0.08 MPa and 60°C for 2 hours. Solid-liquid separation, cooling, and granulation are then performed to obtain phase change material particles.

[0057] S5. Weigh out maleic anhydride modified asphalt and C9 petroleum resin according to the design ratio. Heat the maleic anhydride modified asphalt to 165°C, add C9 petroleum resin, mix evenly, and obtain the outer coating material.

[0058] S6. 100g of the phase change material particles are immersed in 650mL of an alcohol solution of KH550 silane coupling agent with a mass percentage of 40%, and surface activated at 45°C for 2.5h. Then, the particles are immersed in the outer coating material, and solid-liquid separation is performed. The mixture is then cured at 130°C for 2h to obtain the composite pavement phase change material.

[0059] Example 2

[0060] This embodiment provides a composite pavement phase change material, specifically comprising the following: a cellulose aerogel substrate, a phase change core material impregnated in the pores of the substrate, and an outer coating material; wherein, the phase change core material comprises the following raw material components in parts by mass: 30g expanded graphite, 60g lauric acid / myristic acid eutectic, and 50g polyethylene glycol; the outer coating material is a mixture of 15g petroleum resin and 50g maleic anhydride modified asphalt.

[0061] The preparation method of the composite pavement phase change material includes the following steps:

[0062] S1, 200g of cellulose powder was dispersed in 950mL of 0.1mol / L sodium hydroxide solution, 120mL of 0.2mol / L ammonia solution was added, the mixture was mixed evenly, and the gelation reaction was carried out at 65℃ for 8h to obtain the aerogel precursor;

[0063] S2, the aerogel precursor is cooled to -35℃ and freeze-dried for 30 hours to obtain a pore volume of 1.0 cm³. 3 / g of cellulose aerogel;

[0064] S3, weigh lauric acid / myristic acid eutectic and polyethylene glycol according to the design ratio, mix them, heat and melt them, and then add expanded graphite to obtain a fluid phase change hybrid material;

[0065] S4, the cellulose aerogel is added to the phase change mixture, and vacuum impregnation is performed at a vacuum degree of 0.08 MPa and 60°C for 2 hours. Solid-liquid separation, cooling, and granulation are then performed to obtain phase change material particles.

[0066] S5. Weigh out maleic anhydride modified asphalt and C9 petroleum resin according to the design ratio. Heat the maleic anhydride modified asphalt to 155°C, add C9 petroleum resin, and mix evenly to obtain the outer coating material.

[0067] S6. 100g of the phase change material particles are immersed in 500mL of an alcohol solution of KH550 silane coupling agent with a mass percentage of 40%, and surface activated at 50°C for 2.5h. Then, the particles are immersed in the outer coating material, and solid-liquid separation is performed. The mixture is then cured at 130°C for 2h to obtain the composite pavement phase change material.

[0068] Example 3

[0069] This embodiment provides a composite pavement phase change material, specifically comprising the following: a cellulose aerogel substrate, a phase change core material impregnated in the pores of the substrate, and an outer coating material; wherein, the phase change core material comprises the following raw material components in parts by mass: 30g expanded graphite, 100g lauric acid / myristic acid eutectic, and 50g polyethylene glycol; the outer coating material is a mixture of 10g petroleum resin and 50g maleic anhydride modified asphalt.

[0070] The preparation method of the composite pavement phase change material includes the following steps:

[0071] S1, 200g of cellulose powder was dispersed in 800mL of 0.2mol / L sodium hydroxide solution, 120mL of 0.2mol / L ammonia solution was added, the mixture was mixed evenly, and the gelation reaction was carried out at 70℃ for 7h to obtain the aerogel precursor;

[0072] S2, the aerogel precursor is cooled to -40℃ and freeze-dried for 26 hours to obtain a pore volume of 1.5 cm³. 3 / g of cellulose aerogel;

[0073] S3, weigh lauric acid / myristic acid eutectic and polyethylene glycol according to the design ratio, mix, heat to melt, and then add expanded graphite to obtain a fluid phase change hybrid material;

[0074] S4, the cellulose aerogel is added to the phase change mixture, and vacuum impregnation is performed at a vacuum degree of 0.07 MPa and 60°C for 1.5 h. Solid-liquid separation is then performed, followed by cooling and granulation to obtain phase change material particles.

[0075] S5. Weigh out maleic anhydride modified asphalt and C9 petroleum resin according to the design ratio. Heat the maleic anhydride modified asphalt to 170°C, add C9 petroleum resin, mix evenly, and obtain the outer coating material.

[0076] S6. 100g of the phase change material particles are immersed in 750mL of an alcohol solution of KH550 silane coupling agent with a mass percentage of 35%, and surface activated at 40°C for 3h. Then, the particles are immersed in the outer coating material, and solid-liquid separation is performed. The mixture is then cured at 125°C for 3h to obtain the composite pavement phase change material.

[0077] Comparative Example 1

[0078] This comparative example provides a composite pavement phase change material. The difference from Example 1 is that the lauric acid / myristic acid eutectic in the phase change core material is replaced with an equal amount of lauric acid. Other components and processes remain unchanged and will not be described in detail here.

[0079] Comparative Example 2

[0080] This comparative example provides a composite pavement phase change material. The difference from Example 1 is that the lauric acid / myristic acid eutectic in the phase change core material is replaced with an equal amount of myristic acid. Other components and processes remain unchanged and will not be described in detail here.

[0081] Comparative Example 3

[0082] This comparative example provides a composite pavement phase change material. The difference between this example and Example 1 is that the phase change core material does not contain expanded graphite, while the other components and processes remain unchanged, and will not be described in detail here.

[0083] Comparative Example 4

[0084] This comparative example provides a composite pavement phase change material. The difference from Example 1 is that the outer coating material is a mixture of 10g petroleum resin and 40g asphalt. Other components and processes remain unchanged and will not be described in detail here.

[0085] Comparative Example 5

[0086] This comparative example provides a composite pavement phase change material. The difference between this example and Example 1 is that the outer coating material is a mixture of 40g of maleic anhydride modified asphalt. Other components and processes remain unchanged and will not be described in detail here.

[0087] To further demonstrate the technical effects of the present invention, the composite pavement phase change materials obtained in Examples 1-3 and Comparative Examples 1-5 are used to prepare asphalt mixtures, and the specific operations are shown in the application examples.

[0088] Application examples

[0089] Heat 500g of No. 90 asphalt to 170℃, add 30g of the composite phase change material, and shear at 2000rpm for 10min to obtain the phase change asphalt material.

[0090] The phase change asphalt material and aggregate are mixed evenly at a mass ratio of 5:95 to obtain an asphalt mixture; wherein the aggregate is conventional aggregate of the prior art.

[0091] The asphalt mixtures obtained from the various embodiments and comparative examples were subjected to the following tests: Rutting tests (dynamic stability) and four-point bending fatigue life tests were conducted at normal and high temperatures (65℃) according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The test results are shown in Table 1. Low-temperature bending tests (-15℃) were also conducted according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The test results are shown in Table 2.

[0092] Table 1

[0093]

[0094] Table 2

[0095]

[0096] 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 or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite pavement phase change material, characterized in that: The invention comprises a cellulose aerogel substrate, a phase change core material impregnated in the pores of the cellulose aerogel substrate, and an outer coating material covering the surface of the cellulose aerogel substrate; wherein the phase change core material comprises expanded graphite, lauric acid / myristic acid eutectic, and polyethylene glycol; the outer coating material is a mixture of petroleum resin and maleic anhydride modified bitumen; the phase change core material comprises the following raw material components in parts by mass: 3-5 parts expanded graphite, 5-10 parts lauric acid / myristic acid eutectic, and 5-8 parts polyethylene glycol; the outer coating material comprises petroleum resin and maleic anhydride modified bitumen in a mass ratio of 1:3 to 1:

5.

2. The composite pavement phase change material as described in claim 1, characterized in that: The cellulose aerogel substrate has a pore volume of 0.8~1.5 cm³. 3 / g.

3. The method for preparing the composite pavement phase change material according to any one of claims 1 to 2, characterized in that: Includes the following steps: S1, cellulose powder is dispersed in an alkaline solution, and a crosslinking agent is added to carry out a gelation reaction to obtain an aerogel precursor; S2, freeze-dry the aerogel precursor to obtain cellulose aerogel; S3, weigh lauric acid / myristic acid eutectic and polyethylene glycol according to the design ratio, mix them, heat and melt them, and then add expanded graphite to obtain phase change mixed material; S4, the cellulose aerogel is added to the phase change mixture, and vacuum impregnation is performed under a vacuum degree of 0.07~0.08MPa, followed by cooling and granulation to obtain phase change material particles; S5, maleic anhydride modified asphalt is heated to 150~170℃, petroleum resin is added according to the design ratio, and mixed evenly to obtain the outer coating material. S6, the phase change material particles are immersed in an alcohol solution of silane coupling agent for surface activation, and then immersed in the outer coating material. Solid-liquid separation and curing are performed to obtain a composite pavement phase change material.

4. The method for preparing the composite pavement phase change material as described in claim 3, characterized in that: In S1, the mass-to-volume ratio of the cellulose powder to the alkaline solution is 1g:3mL to 1g:5mL; wherein the alkaline solution is a 0.1-0.3mol / L sodium hydroxide solution. In S1, the crosslinking agent is an aqueous ammonia solution of 0.1~0.2 mol / L; In S1, the volume ratio of the crosslinking agent to the alkaline solution is 1:6-1:8; In S1, the temperature of the gelation reaction is 60~80℃, and the time of the gelation reaction is 6~8h.

5. The method for preparing the composite pavement phase change material as described in claim 3, characterized in that: In S2, the freeze-drying temperature is -40~-20℃, and the freeze-drying time is 24~30h; In S3, the preparation method of the lauric acid / myristic acid eutectic includes the following steps: weighing lauric acid and myristic acid in a molar ratio of 1:1 to 3:1, mixing, heating to melt, and slowly cooling at a rate of 1 to 2 °C / min to obtain the lauric acid / myristic acid eutectic. In S4, the vacuum impregnation temperature is 50~60℃, and the vacuum impregnation time is 1~2h.

6. The method for preparing the composite pavement phase change material as described in claim 3, characterized in that: In S5, the preparation method of maleic anhydride modified asphalt includes the following steps: heating the asphalt to 160~180℃, adding maleic anhydride and an initiator, and then heating to 180~200℃ to carry out a modification reaction to obtain maleic anhydride modified asphalt.

7. The method for preparing the composite pavement phase change material as described in claim 3, characterized in that: In step S6, the mass-to-volume ratio of the phase change material particles to the alcohol solution of the silane coupling agent is 1g:5mL to 1g:8mL; wherein the mass percentage of the silane coupling agent in the alcohol solution is 35% to 45%. In S6, the surface activation temperature is 40-50℃, and the surface activation time is 2-3 hours. In S6, the mass ratio of the phase change material particles to the outer coating material is 1:5 to 1:

7.

8. An asphalt-based pavement material, characterized in that: Includes the composite pavement phase change material as described in any one of claims 1 to 2.

9. The application of the asphalt-based pavement material as described in claim 8 in the field of road engineering construction.

Images