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asphalt pavement structure

A technology for asphalt pavement and asphalt surface layer, applied in the field of traffic engineering, can solve the problems of unsatisfactory comprehensive performance of asphalt mixture of thermal insulation layer, limited effect of pavement temperature control, easy wear and loss of thermal insulation coating, etc. The effect of ventilation and heat dissipation, preventing the downward conduction of heat, and enhancing the resistance to water damage

Inactive Publication Date: 2019-05-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application number 201610176684 discloses a small particle size and large pore multi-layer drainage asphalt pavement structure. The three layers of asphalt concrete that make up the surface layer are all drainage asphalt concrete. The construction cost is high and the rainwater infiltrated into the road surface will shrink cracks along the base layer. Seepage into roadbed
Chinese patent application number CN201610147804 discloses a construction method for dust removal and drainage large-porosity asphalt pavement with graded crushed stone composite layer. The surface layer is used for drainage, which has limited effect on pavement temperature control.
Nevertheless, the technology of active temperature control of asphalt pavement to improve pavement performance is still in its infancy. The overall performance of the asphalt mixture used for the insulation layer is not ideal, and the insulation coating is prone to wear and loss, which affects the durability of the pavement.
In addition, the corresponding asphalt pavement structure has not been designed according to the climate characteristics of each region in the prior art

Method used

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Examples

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Embodiment 1

[0038] The asphalt pavement structure in this embodiment is suitable for areas where the annual average temperature is below 10°C.

[0039] Such as Figures 9 to 11 As shown, a kind of asphalt pavement structure of the present embodiment comprises an asphalt pavement 3, and the asphalt pavement 3 includes a lower layer 31, a middle surface layer 32, a drainage heat insulation layer 33 and an upper layer 34 arranged sequentially from bottom to top, The drainage heat insulation layer 33 is an asphalt mixture layer with a porosity of 8% to 20%. The asphalt pavement structure of this embodiment has both drainage and temperature control functions, and a drainage and heat insulation layer 33 is set between the upper layer 34 and the middle layer 32 of the asphalt surface layer 3, compared with setting a drainage asphalt concrete PAC or PAC on the road surface. The open-graded asphalt wear layer OGFC not only drains the asphalt surface layer 3 that is most affected by external water...

Embodiment 2

[0055] The asphalt pavement structure of this embodiment is suitable for areas with an annual average temperature of 10°C to 15°C.

[0056] In this embodiment, the structure of the asphalt pavement is roughly the same as that of Embodiment 1, except that the middle surface layer 32 also serves as the drainage and heat insulation layer 33, and the drainage and heat insulation layer 33 is fine-grained asphalt with a porosity of 15% to 20%. The mixture layer (this example is the open-graded asphalt wear course OGFC-13), the middle surface layer 32 is a medium-grained asphalt mixture layer with a void ratio of 8% to 15% (this example is the open-graded asphalt wear course OGFC-16), the thickness of the middle surface layer 32 is T3, wherein, 50mm≤T3≤70mm.

[0057] After selecting the specific values ​​of T1, T2, T3, and T4 within the above range, determine the thickness of the remaining layers of the asphalt pavement structure according to the method of my country's highway asphal...

Embodiment 3

[0060] The asphalt pavement structure in this embodiment is suitable for areas where the average temperature is above 15° C. and where the cooling effect of natural ventilation and drainage is limited.

[0061] The structure of the asphalt pavement in this embodiment is substantially the same as that in Embodiment 2, except that: the drainage heat insulation layer 33 contains water-retaining materials, and the water-retention materials are poured into the drainage heat insulation layer 33 after paving.

[0062] The drainage heat insulation layer 33 implements partial water retention to improve the cooling effect, so that part of the pores of the drainage heat insulation layer 33 are filled with water retention materials, and its temperature control ability is stronger, so as to prevent the formation of pore water pressure in the drainage heat insulation layer 33 under the action of the wheel load , can further actively control moisture, help to reduce the pore water pressure of...

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Abstract

The invention discloses an asphalt pavement structure comprising an asphalt surface layer which comprises a lower layer, an intermediate layer, a drainage insulation layer and an upper layer arranged in order from bottom to top, wherein the drainage insulation layer is an asphalt mixture layer with a porosity of 8% to 20%. The asphalt pavement structure disclosed by the invention has the functions of drainage and temperature control, and has the advantages of reducing water damage and ruts of asphalt pavements.

Description

technical field [0001] The invention relates to the field of traffic engineering, in particular to an asphalt pavement structure. Background technique [0002] The asphalt pavement is exposed to the natural environment, and the temperature and humidity inside the pavement change with the natural environment. The performance of the asphalt pavement is greatly affected by the change of the natural environment. For a long time, my country's highways generally use three-layer dense asphalt mixture as the semi-rigid base asphalt pavement of the surface layer, such as figure 1 As shown, the upper layer is generally 40mm thick, the middle layer is 50mm or 60mm thick, and the lower layer is 70mm or 80mm thick. The ideal structure of dense graded asphalt mixture is a dense skeleton structure, but because the skeleton structure of coarse aggregate is affected by the interference of fine aggregate, coarse aggregate is often suspended between fine aggregate, such as figure 2 As shown...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/32E01C11/00
CPCE01C7/32E01C7/325E01C11/225
Inventor 姜旺恒韦潇树王润丰王征东刘志恒
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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