Asphalt road capable of reducing road surface temperature

Abstract

The present invention relates to asphalt roads, and more particularly to an asphalt road that can reduce road surface temperature. The road is paved using the following method: a roadbed and a cushion layer are laid; a base layer is laid by adding 1-2% flaky graphite powder to the base material, mixing uniformly, and compacting the layers in layers; and a surface layer is laid by adding 0.5-1% flaky aluminum powder and 1-2% flaky graphite powder to the asphalt material, mixing uniformly, and then laying the asphalt layer. The flaky aluminum powder and flaky graphite powder of the present invention can more quickly transfer heat absorbed by the surface layer to the base layer, and the flaky aluminum powder and flaky graphite powder can partially reflect sunlight, thereby effectively reducing the road temperature, extending the service life of the asphalt road, and reducing maintenance costs.

Description

Technical Field

[0001] The invention relates to asphalt roads, and in particular to an asphalt road capable of reducing road surface temperature. Background Art

[0002] Asphalt pavement experiences high temperatures in the summer, reaching as high as 50-80°C due to direct sunlight. These high temperatures can pose significant risks to roads. First, high temperatures reduce the strength of asphalt pavement. Long-term driving on hot surfaces by large vehicles can easily cause rutting, damaging the pavement and increasing repair costs. Second, high temperatures cause the asphalt to melt, increasing the adhesion between wheels and the road surface, impacting vehicles. Summary of the Invention

[0003] The present invention provides an asphalt highway capable of reducing road surface temperature, which can effectively reduce the temperature of the highway, increase the service life of the asphalt highway, and reduce maintenance costs.

[0004] The present invention is achieved by the following measures:

[0005] An asphalt road capable of reducing road surface temperature is paved by the following method:

[0006] laying of roadbed and subgrade;

[0007] Laying the base layer: prepare the base material, add 1-2% (by weight) of flaky graphite powder to the base material, mix evenly, and compact the base material in layers;

[0008] Laying the surface layer: prepare the surface layer asphalt material, add 0.5-1% (by weight) of flaky aluminum powder and 1-2% (by weight) of flaky graphite powder to the surface layer asphalt material, mix evenly, lay the surface layer asphalt material on the base layer, flatten it to form an asphalt layer.

[0009] The above-mentioned asphalt highway capable of reducing road surface temperature is preferably characterized in that: the base material further contains 15-25% (by weight) of steel slag particles.

[0010] The above-mentioned asphalt highway capable of reducing road surface temperature is preferably: after the surface asphalt material is leveled and compacted, aluminum-plated glass beads are evenly sprayed on the surface of the asphalt surface layer at 40-60°C, and the aluminum-plated glass beads are pressed into the surface of the asphalt surface layer with a roller.

[0011] The above-mentioned asphalt road capable of reducing the road surface temperature is preferably: the amount of the aluminum-plated glass beads added is 5-10g / M 2 .

[0012] Cooling principle of the present invention:

[0013] Because the surface layer contains flaky aluminum powder and flaky graphite powder, they have excellent thermal conductivity, which can transfer the heat absorbed by the surface layer to the base layer more quickly, reducing the temperature of the surface layer. In addition, the flaky aluminum powder and flaky graphite powder have certain reflective properties and can also reflect some sunlight, reducing the amount of heat absorbed by the surface layer and preventing excessive absorption of sunlight.

[0014] Similarly, adding a certain amount of flaky graphite powder to the base layer can improve the base layer's thermal conductivity. In a preferred embodiment, adding a certain amount of steel slag, which contains 2% to 8% metallic iron, can improve the base layer's thermal conductivity while increasing its strength.

[0015] In the preferred embodiment, spraying aluminum-coated glass beads on the surface of the asphalt layer can effectively reflect and scatter sunlight, reduce the absorption of sunlight by the asphalt pavement, and lower the surface temperature of the asphalt surface layer.

[0016] Since both the surface layer and the base layer have good thermal conductivity, the heat absorbed by the surface layer can be transferred to the roadbed and cushion layer. Due to the high water content in the roadbed and cushion layer, heat is more easily transferred and can be transferred to deeper strata, thereby reducing the temperature of the road surface.

[0017] The beneficial effects of the present invention are that it can effectively reduce the temperature of the road, increase the service life of the asphalt road, reduce the maintenance cost, and reduce the incidence of vehicle accidents. Implementation Method

[0018] The present invention is described in detail below with reference to the embodiments. Example 1

[0019] The implementation section is a provincial-level asphalt high-grade highway in Shandong, and the experimental section is 500m.

[0020] The road base is laid on the road surface. The main material of the road base is soil, with a small amount of cement added to improve the performance. It is laid flat and compacted.

[0021] Lay a cushion layer on the roadbed. The cushion layer material is granular materials such as sand and gravel, with the content of particles smaller than 0.075mm not exceeding 5%. It should be laid flat and compacted.

[0022] Laying the base: The base of this section of road is a semi-rigid base, and the main material is lime-stabilized steel slag mixture, which is composed of 18% lime, 25% fly ash, 35% gravel and crushed stone, 20% steel slag, and 2% flaky graphite powder by weight.

[0023] The gravel and crushed stone used are composed of a certain proportion of sand, fine crushed stone and coarse crushed stone, and their particle composition meets the requirements of dense gradation, with the content of particles smaller than 0.075mm not exceeding 5%.

[0024] The base layer is constructed in two layers, namely the upper base layer and the lower base layer.

[0025] Laying the surface layer: The surface layer material uses a medium-grained asphalt mixture, in which the mineral particle size is 16mm. Melt the asphalt, mix the mineral and asphalt evenly, then add 0.8% flaky aluminum powder and 1.5% flaky graphite powder, mix evenly, and make the surface layer asphalt material. Lay the asphalt layer, lay it flat and compact it. Example 2

[0026] Example 2 is basically the same as Example 1, except that after the asphalt is leveled and compacted, aluminum-coated glass beads are evenly sprayed on the surface of the asphalt layer in an amount of 6 g / M 2 , use a roller to press the aluminum-coated glass beads into the surface of the asphalt surface layer.

[0027] Comparative Example

[0028] The comparative example is basically the same as Example 1, except that no flaky aluminum powder and flaky graphite powder are added to the base layer and the surface layer.

[0029] The test results are as follows

[0030] The performance test of the above experimental road section and the comparison road surface was carried out at a summer temperature of 37°C and direct sunlight at noon. The surface temperature of the road section in Example 1 was 55°C, and there was no obvious change in the asphalt road surface. When the vehicle was driving, there was no adhesion between the wheels and the asphalt road surface.

[0031] The surface temperature of the road section in Example 2 was 52° C., and the asphalt on the road surface did not change significantly. When the vehicle was traveling, there was no adhesion between the wheels and the asphalt road surface.

[0032] The surface temperature of the road is 62°C, and the asphalt on the road surface has become soft and sticky. When the vehicle is driving, the wheels have a slight adhesion to the asphalt road surface.

Claims

1. An asphalt road capable of reducing road surface temperature, characterized in that It is laid using the following method: laying of roadbed and subgrade; Laying the base layer: prepare the base material, add 1-2% (by weight) of flaky graphite powder to the base material, mix evenly, and compact the base material in layers; Laying the surface layer: preparing a surface layer asphalt material, adding 0.5-1% (by weight) of flaky aluminum powder and 1-2% (by weight) of flaky graphite powder to the surface layer asphalt material, mixing them evenly, laying the surface layer asphalt material on the base layer, and flattening it to form an asphalt layer; The base material also contains 15-25% (by weight) of steel slag particles; After the surface asphalt material is leveled and compacted, aluminum-plated glass beads are evenly sprayed on the surface of the asphalt surface at 40-60°C, and the aluminum-plated glass beads are pressed into the surface of the asphalt surface with a roller; the amount of aluminum-plated glass beads added is 5-10g / M 2 .