Salt-storage ice-melting asphalt concrete pavement structure

Abstract

The utility model discloses a salt storage and ice melting asphalt concrete pavement structure which comprises a surface layer, a first permeable layer, a first salt storage layer, a second permeable layer, a second salt storage layer, a sealing layer and a base layer which are sequentially arranged from top to bottom, the salt storage amount of the second salt storage layer is larger than that of the first salt storage layer, and the salt storage amount of the first salt storage layer is larger than that of the surface layer. According to the utility model, a gradient doping mode that the salt storage amount is gradually reduced from bottom to top is realized, so that when rainwater permeates into a pavement structure, the initial salt storage amount can be effectively reduced by the small doping amount of the surface layer, and the salt storage filler in the middle and lower layers can migrate to the upper layer under the action of concentration difference; the problem that salt in the middle and lower layers of a traditional salt-storage asphalt concrete pavement is interlocked in the lower layer to cause waste is effectively solved, the utilization rate of raw materials is greatly increased, and meanwhile the ice and snow melting service life of the salt-storage ice-melting asphalt concrete pavement is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of road engineering, in particular to a salt-storing and ice-melting asphalt concrete pavement structure. Background Art

[0002] In cold environments, snow and ice accumulation on the road surface can easily lead to serious traffic accidents and bring huge economic losses. Salt-storage asphalt pavement, as a functional pavement with the ability to melt snow and suppress ice, can ensure the road surface's anti-skid properties and road passability in cold environments, effectively ensuring the smooth and safe flow of roads in winter, and is increasingly being used in road design.

[0003] As an active road deicing facility, the existing salt-storage asphalt pavement is usually paved with salt-storage asphalt mixture, which is composed of asphalt concrete and slow-release salt-storage filler as aggregate or filler. The salt-storage asphalt pavement not only has the advantages of active, efficient, bottom-up melting of ice and snow, but also can achieve continuous and lasting snow and ice melting, avoiding a series of adverse effects caused by the use of a large amount of snow-melting agents. At the same time, under the rolling action of vehicle loads, the efficiency of snow and ice melting is improved, a large amount of snow-melting agents can be saved, and the corrosion of chloride salts on the environment and infrastructure along the line is reduced.

[0004] However, after long-term use and research, it was found that the existing slow-release salt storage fillers have the problem of insufficient time effectiveness. The main reason is that if the slow-release salt storage fillers are only added to the upper layer, it is easy to cause a large amount of snow-melting salt to be lost under the action of rain and vehicle rolling, resulting in a short period of time for the snow-melting function; if they are added to the upper, middle and lower layers of the road at the same time, there are the following shortcomings: the slow-release salt storage fillers in the lower layer are difficult to migrate to the upper layer, which easily leads to difficulty in the upward migration of the slow-release salt storage fillers in the middle and lower layers, resulting in a waste of fillers. The slow-release salt storage fillers in the upper layer are difficult to be replenished in time after precipitation, which will cause the road surface to have a short time to melt snow and ice, and it is difficult to truly achieve the effect of long-term self-melting snow and ice on the road surface. Utility Model Content

[0005] In view of the deficiencies existing in the prior art, the utility model provides a salt-storing and ice-melting asphalt concrete pavement structure.

[0006] The utility model discloses a salt-storing ice-melting asphalt concrete pavement structure, comprising a surface layer, a first permeable layer, a first salt-storing layer, a second permeable layer, a second salt-storing layer, a sealing layer and a base layer, which are arranged in sequence from top to bottom;

[0007] The salt storage capacity of the second salt storage layer is greater than that of the first salt storage layer, and the salt storage capacity of the first salt storage layer is greater than that of the surface layer.

[0008] As a further improvement of the utility model, the surface layer is an asphalt concrete layer, and the thickness of the asphalt concrete layer is 10-50 mm;

[0009] The salt storage capacity of the asphalt concrete layer is 0%.

[0010] As a further improvement of the present invention, the first permeable layer and the second permeable layer are both first adhesive layers;

[0011] The spreading amount of the first adhesive layer is 0.3-1.5 kg / m 2 .

[0012] As a further improvement of the utility model, the sealing layer is a second adhesive layer;

[0013] The spreading amount of the second adhesive layer is 0.2-2kg / m 2 .

[0014] As a further improvement of the present invention, the first adhesive layer and the second adhesive layer are both one of a polyurethane adhesive layer, an epoxy resin adhesive layer and an emulsified asphalt adhesive layer.

[0015] As a further improvement of the utility model, the first salt storage layer is a middle surface layer, and the middle surface layer is a first salt storage asphalt mixture layer;

[0016] The thickness of the first salt-storing asphalt mixture layer is 20-50 mm, and the salt storage amount of the first salt-storing asphalt mixture layer is 4-7%.

[0017] As a further improvement of the utility model, the second salt storage layer is a lower layer, and the lower layer is a second salt storage asphalt mixture layer;

[0018] The thickness of the second salt-storage asphalt mixture layer is 20-60 mm, and the salt storage amount of the second salt-storage asphalt mixture layer is greater than 10%.

[0019] As a further improvement of the utility model, the base layer is a roadbed, and the compaction degree of the roadbed is greater than 93%.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model realizes a gradient adding method in which the salt storage amount gradually decreases from bottom to top by making the salt storage amount of the second salt storage layer greater than that of the first salt storage layer, and the salt storage amount of the first salt storage layer greater than that of the surface layer, so that when rainwater infiltrates into the pavement structure, the less adding amount of the surface layer can effectively reduce the initial salt analysis amount, and the salt storage filler of the middle and lower layers can migrate to the upper layer under the action of the concentration difference, effectively solving the problem that the salt of the middle and lower layers of the traditional salt-storing asphalt concrete pavement is locked in the lower layer and causes waste, greatly improving the utilization rate of raw materials, and at the same time increasing the ice and snow melting effect of the salt-storing ice-melting asphalt concrete pavement;

[0022] The utility model provides the first and second permeable layers and makes full use of their thermal expansion and contraction effects, so that when the temperature is 5°C or below, the contraction effect causes the first and second permeable layers to produce permeable pores, so that the melted salt storage filler enters the road surface in the form of a solution, and the salt compounds in the deep layer of the road surface are released under the vehicle load, pumping action, osmotic pressure and capillary action, and rise to the road surface, thereby achieving a better ice and snow melting effect; when the temperature is greater than 20°C, the first and second permeable layers close the pores under the action of thermal expansion, so that the melted salt storage filler cannot migrate upward to the surface layer, thereby extending the service life of the salt storage ice melting asphalt concrete pavement;

[0023] The utility model reduces the waste of salt-storage fillers by setting the surface layer as an asphalt concrete layer without salt-storage fillers, while ensuring the road performance of the road surface and extending the service life of the salt-storage snow-melting road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side sectional view of the structural schematic diagram of a salt-storing and ice-melting asphalt concrete pavement structure disclosed in one embodiment of the utility model.

[0025] In the figure:

[0026] 1. Surface layer; 2. First permeable layer; 3. First salt storage layer; 4. Second permeable layer; 5. Second salt storage layer; 6. Sealing layer; 7. Base layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0031] like Figure 1 As shown, a salt-storing ice-melting asphalt concrete pavement structure provided by the utility model includes a surface layer 1, a first permeable layer 2, a first salt storage layer 3, a second permeable layer 4, a second salt storage layer 5, a sealing layer 6 and a base layer 7 arranged in sequence from top to bottom; wherein the salt storage amount of the second salt storage layer 5 is greater than the salt storage amount of the first salt storage layer 3, and the salt storage amount of the first salt storage layer 3 is greater than the salt storage amount of the surface layer 1.

[0032] In this embodiment, the salt storage capacity of the second salt storage layer 5 is greater than that of the first salt storage layer 3, and the salt storage capacity of the first salt storage layer 3 is greater than that of the surface layer 1, so that a gradient addition method in which the salt storage capacity gradually decreases from bottom to top is achieved, so that when rainwater penetrates into the pavement structure, the less addition amount of the surface layer 1 can effectively reduce the initial salt analysis amount, and the salt storage fillers in the middle and lower layers can migrate to the upper layer under the action of the concentration difference, which effectively solves the problem that the salt in the middle and lower layers of the traditional salt-storage asphalt concrete pavement is locked in the lower layer and causes waste, greatly improves the utilization rate of raw materials, and increases the ice and snow melting effect of the salt-storage ice-melting asphalt concrete pavement; at the same time, By setting the first and second permeable layers and making full use of their thermal expansion and contraction effects, when the temperature is 5°C or below, the contraction effect causes the first and second permeable layers to produce permeable pores, allowing the melted salt-storage filler to enter the road surface in the form of a solution, and the salt compounds in the deep layer of the road surface are released under the action of vehicle load, pumping, osmotic pressure and capillary action, and rise to the surface layer 1 of the road surface, thereby achieving a better ice and snow melting effect; when the temperature is greater than 20°C, the first and second permeable layers close the pores under the action of thermal expansion, so that the melted salt-storage filler cannot migrate upward to the surface layer 1, thereby extending the service life of the salt-storage ice-melting asphalt concrete pavement.

[0033] Specific:

[0034] like Figure 1 As shown, in the above embodiment, preferably, the surface layer 1 serves as the upper layer or the wear layer, and the upper layer or the wear layer is an asphalt concrete layer, and the thickness of the asphalt concrete layer is 10-50 mm; the salt storage capacity of the asphalt concrete layer is 0%.

[0035] In this embodiment, by setting the surface layer 1 as an asphalt concrete layer without salt-storage filler, on the one hand, the waste of salt-storage filler is reduced, and on the other hand, the road performance of the road surface is guaranteed, and the service life of the salt-storage snow-melting road surface is extended.

[0036] In the above embodiment, preferably, the first permeable layer 2 and the second permeable layer 4 are both first adhesive layers with thermal expansion and contraction effects, and the first adhesive layer is one of a polyurethane adhesive layer, an epoxy resin adhesive layer and an emulsified asphalt adhesive layer, and the spreading amount of the first adhesive layer is 0.3-1.5 kg / m 2 .

[0037] In the above embodiment, preferably, the sealing layer 6 is a second adhesive layer having a water-proof effect, and the spreading amount of the second adhesive layer is 0.2-2 kg / m 2 The second adhesive layer is one of a polyurethane adhesive layer, an epoxy resin adhesive layer and an emulsified asphalt adhesive layer.

[0038] In the above embodiment, preferably, the first salt storage layer 3 is a middle surface layer, which is a first salt storage asphalt mixture layer; the thickness of the first salt storage asphalt mixture layer is 20-50 mm, and the salt storage capacity of the first salt storage asphalt mixture layer is 4-7%.

[0039] In the above embodiment, preferably, the second salt storage layer 5 is the lower layer, which is the second salt storage asphalt mixture layer; the thickness of the second salt storage asphalt mixture layer is 20-60 mm, and the salt storage capacity of the second salt storage asphalt mixture layer is greater than 10%.

[0040] In the above embodiment, preferably, the first salt-storage asphalt mixture layer and the second salt-storage asphalt mixture layer are both paved with salt-storage asphalt mixture, wherein the salt-storage asphalt mixture is an existing material, and its ice-melting principle is an existing technology, which is disclosed in relevant documents such as "Research on Road Performance and Ice-Melting Characteristics of Salt-Storage Asphalt Mixture" by Meng Xianchun, "Long-term Evaluation of Salt-Storage Anti-Ice Asphalt Mixture" by Guo Peng, and "Research and Development and Performance Evaluation of Slow-Release Salt-Storage Asphalt Mixture" by Sun Rongrong. It mainly includes asphalt concrete and slow-release salt-storage filler as aggregate or filler. The asphalt concrete in this embodiment includes one of AC-10, AC-13, AC-20, SMA-10, and SMA-13. The slow-release salt-storage filler in this embodiment includes a salt filler, and the salt filler includes chloride salt or ammonium salt. When chloride salt is selected, sodium chloride, calcium chloride, magnesium chloride and other salts can be selected.

[0041] In the above embodiment, preferably, the base layer 7 is a roadbed, and the compaction degree of the roadbed is greater than 93%.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A salt-storage ice-melting asphalt concrete pavement structure, characterized in that: It includes a surface layer, a first permeable layer, a first salt storage layer, a second permeable layer, a second salt storage layer, a sealing layer and a base layer which are arranged in sequence from top to bottom; The salt storage capacity of the second salt storage layer is greater than that of the first salt storage layer, and the salt storage capacity of the first salt storage layer is greater than that of the surface layer.

2. The salt-storage ice-melting asphalt concrete pavement structure according to claim 1 is characterized in that: The surface layer is an asphalt concrete layer, and the thickness of the asphalt concrete layer is 10-50 mm; The salt storage capacity of the asphalt concrete layer is 0%.

3. The salt-storage ice-melting asphalt concrete pavement structure according to claim 1 is characterized in that: The first permeable layer and the second permeable layer are both first adhesive layers; The spreading amount of the first adhesive layer is 0.3-1.5 kg / m 2 .

4. The salt-storage ice-melting asphalt concrete pavement structure according to claim 3 is characterized in that: The sealing layer is a second adhesive layer; The spreading amount of the second adhesive layer is 0.2-2kg / m 2 .

5. The salt-storage ice-melting asphalt concrete pavement structure according to claim 4 is characterized in that: The first adhesive layer and the second adhesive layer are both one of a polyurethane adhesive layer, an epoxy resin adhesive layer and an emulsified asphalt adhesive layer.

6. The salt-storage ice-melting asphalt concrete pavement structure according to claim 1 is characterized in that: The first salt storage layer is a middle surface layer, and the middle surface layer is a first salt storage asphalt mixture layer; The thickness of the first salt-storing asphalt mixture layer is 20-50 mm, and the salt storage amount of the first salt-storing asphalt mixture layer is 4-7%.

7. The salt-storage ice-melting asphalt concrete pavement structure according to claim 1 is characterized in that: The second salt storage layer is the lower layer, and the lower layer is the second salt storage asphalt mixture layer; The thickness of the second salt-storage asphalt mixture layer is 20-60 mm, and the salt storage amount of the second salt-storage asphalt mixture layer is greater than 10%.

8. The salt-storage ice-melting asphalt concrete pavement structure according to claim 1 is characterized in that: The base layer is a roadbed, and the compaction degree of the roadbed is greater than 93%.

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