阅读说明：本技术 一种相变储热-反射隔热复合功能型降温路面材料、制备方法及其应用 (Phase-change heat storage-reflection heat insulation composite functional cooling pavement material, preparation method and application thereof ) 是由 柴冲冲 韩建勇 杨利香 陆美荣 韩云婷 刘飞 陈智蓉 钱耀丽 周骁琛 于 2021-07-29 设计创作，主要内容包括：本申请涉及路面材料的技术领域,具体公开了一种相变储热-反射隔热复合功能型降温路面材料、制备方法及其应用。该相变储热-反射隔热复合功能型降温路面材料,包括：沥青混合料和反射隔热涂料,所述反射隔热涂料涂覆在所述沥青混合料表面；所述沥青混合料由包含以下重量百分比的原料制成：粗集料50-80％,细集料10-20％,填料0.1-15％,沥青4-7％、纤维0.05-0.5％以及相变材料0.01-0.1％,所述相变材料的相变温度为30℃-60℃。本发明通过将相变材料和反射隔热涂料的结合使用,使得沥青路面降温效果更佳显著,是相变材料和反射隔热涂料熔化吸热的共同作用。(The application relates to the technical field of pavement materials, and particularly discloses a phase-change heat storage-reflection heat insulation composite functional cooling pavement material, a preparation method and application thereof. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises: the reflective heat-insulating coating is coated on the surface of the asphalt mixture; the asphalt mixture is prepared from the following raw materials in percentage by weight: 50-80% of coarse aggregate, 10-20% of fine aggregate, 0.1-15% of filler, 4-7% of asphalt, 0.05-0.5% of fiber and 0.01-0.1% of phase change material, wherein the phase change temperature of the phase change material is 30-60 ℃. The phase-change material and the reflective heat-insulation coating are combined for use, so that the asphalt pavement has a better and obvious cooling effect, and the phase-change material and the reflective heat-insulation coating are used together for melting and absorbing heat.)

1. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material is characterized in that: the reflective heat-insulating coating is coated on the surface of the asphalt mixture; the asphalt mixture is prepared from the following raw materials in percentage by weight: 50-80% of coarse aggregate, 10-20% of fine aggregate, 0.1-15% of filler, 4-7% of asphalt, 0.05-0.5% of fiber and 0.01-0.1% of phase change material, wherein the phase change temperature of the phase change material is 30-60 ℃.

2. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 1, wherein: the reflective heat-insulation coating is prepared from the following raw materials in percentage by weight: 3-5% of silane coupling agent, 18-25% of silica sol, 18-25% of styrene-acrylic emulsion, 20-30% of titanium dioxide, 1-2% of film-forming assistant, 4-8% of clay mineral, 2-5% of nano zirconia, 1-1.5% of dispersant, 0.15-0.25% of pH regulator and the balance of water;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

3. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 1, wherein: the phase-change material is one or more of paraffin, fatty acid and polyethylene glycol.

4. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 1, wherein: the coarse aggregate at least comprises one of basalt, limestone or granite.

5. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 4, wherein: the coarse aggregates comprise coarse aggregates with the particle size of 10-15mm and coarse aggregates with the particle size of 5-10mm, and the mass ratio of the coarse aggregates with the particle size of 10-15mm to the coarse aggregates with the particle size of 5-10mm is 1-2: 1.

6. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 1, wherein: the fine aggregate is limestone chips, and the filler is limestone mineral powder.

7. The phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in claim 1, wherein: the fiber at least comprises one of lignin fiber and mineral fiber.

8. A method for preparing a phase-change heat storage-reflection heat insulation composite functional cooling pavement material as claimed in any one of claims 1 to 7, which is characterized in that: the method specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate is 50 to 80 percent, the fine aggregate is 10 to 20 percent, the filler is 0.1 to 15 percent, the asphalt is 4 to 7 percent, the fiber is 0.05 to 0.5 percent, and the phase change material is 0.01 to 0.1 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 160-180 ℃, and the preheating time is 2-12 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the temperature of 160-180 ℃ to obtain an asphalt mixture, wherein the asphalt mixture is obtained by adopting a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material.

9. The method for preparing a phase-change heat storage-reflection heat insulation composite functional cooling pavement material according to claim 8, wherein the method comprises the following steps: in the step S5, the coating thickness of the reflective heat insulation coating is 1.5-2 mm.

10. The application of the phase-change heat storage-reflection heat insulation composite functional cooling pavement material in roads according to claim 1.

Technical Field

The application relates to the technical field of pavement materials, in particular to a phase-change heat storage-reflection heat insulation composite functional cooling pavement material, a preparation method and application thereof.

Background

With the rapid development of highway industry in China, asphalt pavements are widely used for highway pavements with the advantages of comfort and stability in driving, low noise and the like, which are difficult to replace cement concrete pavements. According to statistics, the asphalt pavement in the existing highway in China accounts for more than 85 percent, and becomes the most main pavement form in paving roads in China. Asphalt is a temperature-sensitive viscoelastic material, and is widely applied to pavement engineering and also faces negative effects caused by temperature. Particularly, with global warming, the temperature in hot areas in summer in China often exceeds 35 ℃ and even reaches more than 40 ℃, and the absorptivity of the asphalt to solar heat radiation is as high as 85% -95% due to the black heat absorption property of the asphalt, so that the temperature of the asphalt pavement is extremely easy to reach more than 60 ℃, the softening point of the asphalt is reached, and the service temperature range of the asphalt pavement is exceeded, and the phenomena of poor thermal stability such as rutting, cuddling, pushing and the like are generated on the asphalt pavement, thereby seriously affecting the pavement performance of the asphalt pavement.

In order to solve the problem of poor thermal stability of the asphalt pavement caused by high temperature, the wide application of the reflective heat-insulating coating relieves the high-temperature hazard of the asphalt pavement, but the reflective heat-insulating coating is easy to peel off and lose efficacy with the increase of the traffic flow of the road and has short service life. Chinese patent publication No. CN103508701A discloses a composite phase-change cooling asphalt pavement material, which is prepared by mixing coarse aggregates, fine aggregates, filler, a non-coagulant silica shaping composite phase-change material, fibers and asphalt or modified asphalt according to a certain proportion.

Although the methods solve the problem of high temperature hazard of some pavements, the situation that the thermal stability of the asphalt pavement is poor is still severe along with the complex change of the environmental temperature in the use process of the asphalt pavement. Accordingly, it is desirable to provide a pavement material that is effective in improving the thermal stability of asphalt pavement.

Disclosure of Invention

In order to overcome the defect of poor heat stability of the asphalt pavement, the application provides a phase-change heat storage-reflection heat insulation composite functional cooling pavement material, a preparation method and application thereof.

In a first aspect, the application provides a phase-change heat storage-reflection heat insulation composite functional cooling pavement material, which adopts the following technical scheme:

the phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture; the asphalt mixture is prepared from the following raw materials in percentage by weight: 50-80% of coarse aggregate, 10-20% of fine aggregate, 0.1-15% of filler, 4-7% of asphalt, 0.05-0.5% of fiber and 0.01-0.1% of phase change material, wherein the phase change temperature of the phase change material is 30-60 ℃.

Preferably, the reflective heat insulation coating is prepared from the following raw materials in percentage by weight: 3-5% of silane coupling agent, 18-25% of silica sol, 18-25% of styrene-acrylic emulsion, 20-30% of titanium dioxide, 1-2% of film-forming assistant, 4-8% of clay mineral, 2-5% of nano zirconia, 1-1.5% of dispersant, 0.15-0.25% of pH regulator and the balance of water;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Preferably, the phase change material is one or more of paraffin, fatty acid and polyethylene glycol.

Preferably, the coarse aggregate includes at least one of basalt, limestone or granite.

Preferably, the coarse aggregates comprise coarse aggregates with the particle size of 10-15mm and coarse aggregates with the particle size of 5-10mm, and the mass ratio of the coarse aggregates with the particle size of 10-15mm to the coarse aggregates with the particle size of 5-10mm is 1-2: 1.

Preferably, the fine aggregate is limestone chips, and the filler is limestone mineral powder.

Preferably, the fiber comprises at least one of lignin fiber and mineral fiber.

In a second aspect, the application provides a method for preparing a phase-change heat storage-reflection heat insulation composite functional cooling pavement material, which adopts the following technical scheme:

a preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate is 50 to 80 percent, the fine aggregate is 10 to 20 percent, the filler is 0.1 to 15 percent, the asphalt is 4 to 7 percent, the fiber is 0.05 to 0.5 percent, and the phase change material is 0.01 to 0.1 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 160-180 ℃, and the preheating time is 2-12 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the temperature of 160-180 ℃ to obtain an asphalt mixture, wherein the asphalt mixture is obtained by adopting a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating the surface of the test piece obtained by demolding in the step S4 with a reflective heat-insulating coating to obtain the phase-change heat storage-reflective heat-insulating composite functional cooling pavement material.

Preferably, in step S5, the reflective thermal insulation coating is applied to a thickness of 1.5-2 mm.

In a third aspect, the application provides an application of the phase-change heat storage-reflection heat insulation composite functional cooling pavement material on a road.

In summary, the present application has the following beneficial effects: when the temperature reaches the phase change temperature range, the phase change material achieves the storage and release performance of heat energy through the change of the phase state of the phase change material. When the phase-change material is converted from a solid state to a liquid state, a large amount of heat is absorbed from the environment, so that the effect of cooling is achieved; the reflective heat-insulation coating forms a reflective heat-insulation coating on the surface of the pavement, and functional filler particles in the coating reflect radiation in a visible region and a near infrared region which account for more than 90% of the total solar radiation energy to the external space, so that the temperature of the asphalt pavement is reduced. Through the combined use of the phase-change material and the reflective heat-insulation coating, the asphalt pavement cooling effect is more remarkable, and the phase-change material and the reflective heat-insulation coating are under the combined action of melting and heat absorption.

Detailed Description

The present application will be described in further detail with reference to examples.

Examples

Example 1

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 58% of coarse aggregate, 19.5% of fine aggregate, 15% of filler, 7% of No. 70 matrix asphalt, 0.45% of fiber and 0.05% of phase change material, wherein the coarse aggregate is basalt, and the mass ratio of the basalt with the grain size of 10-15mm to the basalt with the grain size of 5-10mm is 1: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is lignin fiber; the phase change material is paraffin.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5703%, silica sol 25%, styrene-acrylic emulsion 18%, rutile titanium dioxide 25%, film-forming aid 1%, kaolin 4%, nano-zirconia 2%, dispersing agent 1.2%, pH regulator 0.2%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: 58% of coarse aggregate, 19.5% of fine aggregate, 15% of filler, 7% of No. 70 matrix asphalt, 0.45% of fiber and 0.05% of phase change material;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 160 ℃, and the preheating time is 12 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously and uniformly stirring, wherein the stirring temperature is 160 ℃, and obtaining an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 1.5 mm.

Example 2

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 62% of coarse aggregate, 18% of fine aggregate, 13% of filler, 6.4% of SBS modified asphalt, 0.5% of fiber and 0.1% of phase change material, wherein the coarse aggregate is limestone, and the mass ratio of the limestone with the particle size of 10-15mm to the limestone with the particle size of 5-10mm is 2: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is 0.3 percent of lignin fiber and 0.2 percent of mineral fiber; the phase-change material comprises 0.2% of fatty acid and 0.2% of polyethylene glycol.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5704%, silica sol 18%, styrene-acrylic emulsion 20%, rutile titanium dioxide 30%, film-forming aid 1%, kaolin 6%, nano-zirconia 3%, dispersing agent 1.5%, pH regulator 0.25%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate accounts for 62 percent, the fine aggregate accounts for 18 percent, the filler accounts for 13 percent, the SBS modified asphalt accounts for 6.4 percent, the fiber accounts for 0.5 percent and the phase-change material accounts for 0.1 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 180 ℃ and the preheating time is 2 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 180 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 2 mm.

Example 3

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 70% of coarse aggregate, 20% of fine aggregate, 4.8% of filler, 5% of SBS modified asphalt, 0.1% of fiber and 0.1% of phase change material, wherein the coarse aggregate is granite, and the mass ratio of the granite with the grain diameter of 10-15mm to the granite with the grain diameter of 5-10mm is 1.5: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is mineral fiber; the phase change material is a fatty acid.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5705%, silica sol 20%, styrene-acrylic emulsion 25%, rutile titanium dioxide 20%, film-forming aid 2%, kaolin 8%, nano-zirconia 4%, dispersant 1%, pH regulator 0.15%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersant is LBD-1 dispersant;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate accounts for 70 percent, the fine aggregate accounts for 20 percent, the filler accounts for 4.8 percent, the SBS modified asphalt accounts for 5 percent, the fiber accounts for 0.1 percent, and the phase-change material accounts for 0.1 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 170 ℃ and the preheating time is 8 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 180 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 2 mm.

Example 4

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 70% of coarse aggregate, 15% of fine aggregate, 8.55% of filler, 6% of No. 70 matrix asphalt, 0.4% of fiber and 0.05% of phase change material, wherein the coarse aggregate is basalt and granite, the mass ratio of the basalt with the grain diameter of 10-15mm to the basalt with the grain diameter of 5-10mm is 2:1, and the mass ratio of the granite with the grain diameter of 10-15mm to the granite with the grain diameter of 5-10mm is 1: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is 0.2 percent of lignin fiber and 0.3 percent of mineral fiber; the phase-change material comprises 0.2% of paraffin and 0.2% of polyethylene glycol.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5703%, silica sol 21%, styrene-acrylic emulsion 22%, rutile titanium dioxide 22%, film-forming aid 2%, kaolin 5%, nano-zirconia 5%, dispersing agent 1.3%, pH regulator 0.18%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate accounts for 70 percent, the fine aggregate accounts for 15 percent, the filler accounts for 8.55 percent, the No. 70 matrix asphalt accounts for 6 percent, the fiber accounts for 0.4 percent and the phase change material accounts for 0.05 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 180 ℃ and the preheating time is 10 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 170 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 1.5 mm.

Example 5

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 75% of coarse aggregate, 10% of fine aggregate, 10% of filler, 4.82% of SBS modified asphalt, 0.1% of fiber and 0.08% of phase change material, wherein the coarse aggregate is limestone and granite, the mass ratio of the limestone with the particle size of 10-15mm to the limestone with the particle size of 5-10mm is 1:1, and the mass ratio of the granite with the particle size of 10-15mm to the granite with the particle size of 5-10mm is 2: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is lignin fiber; the phase-change material comprises 0.1% of fatty acid and 0.1% of polyethylene glycol.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5704%, silica sol 20%, styrene-acrylic emulsion 24%, rutile titanium dioxide 28%, film-forming aid 1.5%, kaolin 7%, nano-zirconia 4%, dispersing agent 1.4%, pH regulator 0.22%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, the coarse aggregate accounts for 75 percent, the fine aggregate accounts for 10 percent, the filler accounts for 10 percent, the SBS modified asphalt accounts for 4.82 percent, the fiber accounts for 0.1 percent, and the phase-change material accounts for 0.08 percent;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 160 ℃, and the preheating time is 6 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 180 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 2 mm.

Example 6

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 73% of coarse aggregate, 15% of fine aggregate, 6.3% of filler, 5.5% of SBS modified asphalt, 0.1% of fiber and 0.1% of phase change material, wherein the coarse aggregate is basalt, limestone and granite, the mass ratio of the basalt with the particle size of 10-15mm to the basalt with the particle size of 5-10mm is 2:1, the mass ratio of the limestone with the particle size of 10-15mm to the limestone with the particle size of 5-10mm is 1:1, and the mass ratio of the granite with the particle size of 10-15mm to the granite with the particle size of 5-10mm is 1: 1; the fine aggregate is limestone chips; the filler is limestone mineral powder; the fiber is wood mineral fiber; the phase-change material comprises 0.2% of paraffin, 0.05% of fatty acid and 0.15% of polyethylene glycol.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5705%, silica sol 23%, styrene-acrylic emulsion 21%, rutile titanium dioxide 25%, film-forming aid 1.5%, kaolin 6%, nano-zirconia 3.5%, dispersing agent 1.3%, pH regulator 0.2%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein 73 percent of coarse aggregate, 15 percent of fine aggregate, 6.3 percent of filler, 5.5 percent of SBS modified asphalt, 0.1 percent of fiber and 0.1 percent of phase-change material;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 170 ℃ and the preheating time is 8 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 170 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

s4, placing the asphalt mixture prepared in the step S3 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S5, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S4 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 2 mm.

Comparative example

Comparative example 1

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture and a reflection heat insulation coating, wherein the reflection heat insulation coating is coated on the surface of the asphalt mixture.

The asphalt mixture is prepared from the following raw materials in percentage by weight: 78% of coarse aggregate, 12% of fine aggregate, 5.8% of filler, 4% of SBS modified asphalt and 0.2% of fiber, wherein the coarse aggregate, the fine aggregate, the filler and the fiber are the same as those in the example 6.

The reflective heat insulation coating is prepared from the following raw materials in percentage by weight:

silane coupling agent KH-5705%, silica sol 23%, styrene-acrylic emulsion 21%, rutile titanium dioxide 25%, film-forming aid 1.5%, kaolin 6%, nano-zirconia 3.5%, dispersing agent 1.3%, pH regulator 0.2%, and balance water, wherein the film-forming aid is propylene glycol butyl ether, and the dispersing agent is LBD-1 dispersing agent;

the preparation method of the reflective heat-insulating coating comprises the following steps:

(1) adding a silane coupling agent into the silica sol, then adding the styrene-acrylic emulsion, and stirring to obtain a mixture A;

(2) adding titanium dioxide, a film-forming aid, clay minerals, nano zirconia, a dispersing agent and a regulator into water, and uniformly mixing to obtain a mixture B;

(3) and mixing the mixture A and the mixture B, and then stirring to obtain the reflective heat-insulating coating.

Pigments of different colors were added to the reflective insulation coating in mass percent, the film thickness was 0.15mm, and the Total Solar Reflectance (TSR) and Near Infrared Reflectance (NIR) were measured.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: wherein, 78 percent of coarse aggregate, 12 percent of fine aggregate, 5.8 percent of filler, 4 percent of SBS modified asphalt and 0.2 percent of fiber;

s2, preheating the coarse aggregates, the fine aggregates, the fillers, the fibers and the asphalt weighed in the step S1 to obtain an asphalt mixture, wherein the preheating temperature is 170 ℃, and the preheating time is 8 hours;

s3, placing the asphalt mixture prepared in the step S2 into a track mold according to test procedures to form a test piece, and demolding after maintaining;

and S4, coating a reflective heat insulation coating on the surface of the test piece obtained by demolding in the step S3 to obtain the phase-change heat storage-reflective heat insulation composite functional cooling pavement material, wherein the thickness of the reflective heat insulation coating is 2 mm.

Comparative example 2

The phase-change heat storage-reflection heat insulation composite functional cooling pavement material comprises an asphalt mixture, wherein the asphalt mixture is prepared from the following raw materials in percentage by weight: 62% of coarse aggregate, 20% of fine aggregate, 10.4% of filler, 7% of SBS modified asphalt, 0.5% of fiber and 0.1% of phase change material, wherein the coarse aggregate, the fine aggregate, the filler, the fiber and the phase change material are the same as those in the embodiment 6.

A preparation method of a phase-change heat storage-reflection heat insulation composite functional cooling pavement material specifically comprises the following steps:

s1, weighing the raw materials according to the formula for later use: 62% of coarse aggregate, 20% of fine aggregate, 10.4% of filler, 7% of SBS modified asphalt, 0.5% of fiber and 0.1% of phase change material;

s2, preheating the coarse aggregate, the fine aggregate, the filler, the fibers and the asphalt weighed in the step S1 to obtain a premix, wherein the preheating temperature is 170 ℃, and the preheating time is 8 hours;

s3, adding the phase-change materials weighed according to the preset proportion into the premix obtained in the step S2 through heating, continuously stirring uniformly at the stirring temperature of 170 ℃ to obtain an asphalt mixture, wherein the asphalt mixture adopts a SMA asphalt mastic design method;

and S4, placing the asphalt mixture prepared in the step S3 into a track mold according to the test procedure to form a test piece, and demolding after maintenance to obtain the composite functional cooling pavement material.

Performance test

4% of black pigment is added into the reflective heat-insulating coating in the composite functional cooling pavement material, and the following performance tests are carried out on the composite functional cooling pavement material.

Temperature difference of cooling: taking a common asphalt pavement as a blank contrast, under the same illumination condition, after the common asphalt pavement is irradiated for the same time, measuring the temperature of the surface of each pavement material, wherein the difference value between the measured temperature and the blank contrast is the temperature difference of cooling;

immersion marshall experiment: the method is carried out according to an experimental method in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011);

and (3) rutting test: the method is carried out according to an experimental method of T0719-2011 in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011);

the freeze-thaw splitting test is carried out according to an experimental method of T0729-2000 in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011).

Table 1 results of performance testing

According to the performance test result, the embodiment combines the phase-change material and the reflective heat-insulation coating for use, so that the asphalt pavement cooling effect is better and remarkable, and the phase-change material and the reflective heat-insulation coating are used together for melting and absorbing heat, so that the cooling effect of the pavement material is improved. The pavement material prepared by the invention has excellent cooling effect, and other properties of the asphalt pavement are not reduced. Compared with the embodiment, the pavement material prepared by the comparative example has certain performance limitation because the phase change material is not added in the comparative example 1, the reflective heat insulation coating is not added in the comparative example 2.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.