Crack-resistant basalt fiber asphalt pavement structure

Abstract

A crack-resistant basalt fiber asphalt pavement structure, relating to the technical field of road paving structures, and comprising a cement stabilized macadam base layer and a pavement layer disposed on the upper side of the cement stabilized macadam base layer. A macadam seal coat (3) is disposed between the cement stabilized macadam base layer and the pavement layer, and the macadam seal coat (3) comprises a sand and gravel aggregate layer (6), an upper asphalt layer (7), a basalt fiber layer (8), and a lower asphalt layer (9) which are sequentially disposed from top to bottom, wherein the outer diameter of sand and gravel particles of the sand and gravel aggregate layer (6) is smaller than that of sand and gravel particles of the pavement layer. The macadam seal coat (3) is disposed between the cement stabilized macadam base layer and the pavement layer, and the macadam seal coat (3) is like a high-elasticity and high-strength mesh structure for buffering between the cement stabilized macadam base layer and the pavement layer, so that cracks generated in the cement stabilized macadam base layer are prevented from expanding upward, thereby improving the fatigue resistance of the pavement structure layer.

Description

A crack-resistant basalt fiber asphalt pavement structure Technical Field

[0001] The present invention relates to the technical field of road paving structures, in particular to a crack-resistant basalt fiber asphalt pavement structure. Background Art

[0002] The traditional pavement structure includes a cement-stabilized gravel layer at the bottom and a pavement layer laid on the upper side of the cement-stabilized gravel layer. The pavement layer is generally made of an asphalt concrete layer of a certain thickness, and the asphalt concrete layer includes sand, gravel, asphalt, etc. mixed together.

[0003] The function of the pavement layer is to make the road surface resistant to low temperatures, rutting and fatigue. However, this traditional asphalt concrete layer has limited crack resistance and is prone to cracking. In order to ensure the strength of the road surface, a thicker pavement layer is often required, which not only increases construction costs but also makes the construction process more complicated.

[0004] The inventors are aware of a basalt fiber-reinforced concrete layer, which includes sand, gravel, and asphalt mixed together, and basalt fibers mixed with the sand, gravel, and asphalt. Basalt fibers, like tendons, significantly enhance the concrete layer's crack resistance and shear resistance. However, using only a single layer of this basalt fiber-reinforced concrete layer fails to maximize the pavement's structural performance, resulting in insufficient rutting and fatigue resistance.

[0005] In addition, there is a serious problem with traditional pavement structures. When the base layer, i.e. the cement-stabilized gravel layer, sinks or cracks due to other reasons, the cracks will quickly spread from bottom to top to the pavement layer, causing the pavement layer to crack rapidly and the fatigue resistance of the pavement structure layer to be poor. Summary of the Invention

[0006] The purpose of the present invention is to provide a crack-resistant basalt fiber asphalt pavement structure to solve the technical problem that the above-mentioned pavement structure has weak tensile stress resistance and cracks are easily transmitted between the pavement layer and the roadbase.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A crack-resistant basalt fiber asphalt pavement structure includes a cement-stabilized gravel base layer and a pavement layer arranged on the upper side of the cement-stabilized gravel base layer. A gravel seal layer is arranged between the cement-stabilized gravel base layer and the pavement layer. The gravel seal layer includes a sand and gravel aggregate layer, an upper asphalt layer, a basalt fiber layer and a lower asphalt layer arranged in sequence from top to bottom. The outer diameter of the sand and gravel particles in the sand and gravel aggregate layer is smaller than the outer diameter of the sand and gravel particles in the pavement layer.

[0009] In one embodiment, the pavement layer includes an upper basalt fiber reinforced concrete layer and a lower basalt fiber reinforced concrete layer located below the upper basalt fiber reinforced concrete layer, and the outer diameter of sand and gravel particles in the upper basalt fiber reinforced concrete layer is smaller than the outer diameter of sand and gravel particles in the lower basalt fiber reinforced concrete layer.

[0010] In one embodiment, the pavement layer has a thickness of 11 cm to 13 cm.

[0011] In one embodiment, the spreading amount of basalt fibers in the basalt fiber layer is 100 g / m 2 ~120g / m 2 .

[0012] In one embodiment, the cement-stabilized gravel layer includes a lower cement-stabilized gravel layer and an upper cement-stabilized gravel layer laid on the upper side of the lower cement-stabilized gravel layer. The thickness of the upper cement-stabilized gravel layer is greater than that of the lower cement-stabilized gravel layer. The thickness of the cement-stabilized gravel layer is 40 cm to 48 cm.

[0013] The beneficial effects of the present invention are:

[0014] In the present invention, a gravel seal layer is provided between the cement-stabilized gravel base layer and the pavement layer. The gravel seal layer includes a sand and gravel aggregate layer, an upper asphalt layer, a basalt fiber layer and a lower asphalt layer arranged in sequence from top to bottom. The sand and gravel aggregate layer ensures the compressive performance of the gravel seal layer, the basalt fiber layer ensures the tensile capacity of the gravel seal layer, and the upper asphalt layer and the lower asphalt layer connect the gravel seal layer into a whole. The gravel seal layer is like a layer of high-elasticity and high-strength mesh structure buffered between the cement gravel base layer and the pavement layer, and is used to bear the tensile stress caused by the high-modulus asphalt concrete, prevent the cracks generated in the cement gravel base layer from expanding upward, thereby improving the fatigue resistance of the pavement structure layer.

[0015] Furthermore, the pavement layer is constructed using a lower basalt fiber-reinforced concrete layer and an upper basalt fiber-reinforced concrete layer incorporating basalt fiber. This fully utilizes the reinforcement, adsorption, stabilization, toughening, and crack-resistance properties of basalt fiber, significantly improving the low-temperature crack resistance and water stability of the upper layer of the pavement structure, i.e., the upper basalt fiber-reinforced concrete layer. The lower layer, i.e., the lower basalt fiber-reinforced concrete layer, significantly improves the rutting and fatigue resistance of the lower layer. Each surface layer has different functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] FIG1 is a schematic structural diagram of an embodiment of a crack-resistant basalt fiber asphalt pavement structure according to the present invention;

[0018] FIG2 is a schematic structural diagram of the chip seal in FIG1 ;

[0019] Explanation of the accompanying symbols: 1. Upper basalt fiber reinforced concrete layer; 2. Lower basalt fiber reinforced concrete layer; 3. Gravel seal layer; 4. Upper cement-stabilized gravel layer; 5. Lower cement-stabilized gravel layer; 6. Sand and gravel aggregate layer; 7. Upper asphalt layer; 8. Basalt fiber layer; 9. Lower asphalt layer. DETAILED DESCRIPTION

[0020] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0021] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] An embodiment of a crack-resistant basalt fiber asphalt pavement structure according to the present invention is shown in Figures 1 and 2 . The structure comprises a cement-stabilized gravel base layer and a pavement layer disposed above the cement-stabilized gravel base layer. In this embodiment, the cement-stabilized gravel base layer comprises a lower cement-stabilized gravel layer 5 and an upper cement-stabilized gravel layer 4 disposed above the lower cement-stabilized gravel layer 5. The upper cement-stabilized gravel layer 4 is thicker than the lower cement-stabilized gravel layer 5. The combined thickness of the upper and lower cement-stabilized gravel layers 4 and 5 is 44 cm, of which the upper cement-stabilized gravel layer 4 is 36 cm thick and the lower cement-stabilized gravel layer 5 is 18 cm thick.

[0023] The pavement layer includes an upper basalt fiber reinforced concrete layer 1 and a lower basalt fiber reinforced concrete layer 2 located below the upper basalt fiber reinforced concrete layer 1. The upper basalt fiber reinforced concrete layer 1 and the lower basalt fiber reinforced concrete layer 2 are concrete layers mixed with basalt fiber, which includes basalt fiber, sand and gravel particles, and asphalt. The basalt fiber reinforced concrete layer is a prior art and will not be described in detail here. The crack-resistant basalt fiber asphalt pavement structure in this embodiment is a high-modulus, crack-resistant basalt fiber asphalt pavement structure.

[0024] In one embodiment, the total thickness of the upper basalt fiber reinforced concrete layer 1 and the lower basalt fiber reinforced concrete layer 2 is 12 cm, wherein the thickness of the upper basalt fiber reinforced concrete layer 1 is 4 cm, and the thickness of the lower basalt fiber reinforced concrete layer 2 is 8 cm.

[0025] A chip seal 3 is provided between the pavement layer and the cement-stabilized gravel base. The chip seal 3 comprises, from top to bottom, a sand and gravel aggregate layer 6, an upper asphalt layer 7, a basalt fiber layer 8, and a lower asphalt layer 9. The outer diameter of the sand and gravel particles in the sand and gravel aggregate layer 6 is smaller than that of the pavement layer. In other words, the outer diameter of the sand and gravel particles in the sand and gravel aggregate layer 6 is smaller than that of the upper basalt fiber reinforced concrete layer 1. The basalt fiber in the basalt fiber layer 8 is applied at a rate of 100 g / m². 2 ~120g / m 2 .

[0026] The paving process of the crack-resistant basalt fiber asphalt pavement structure in this embodiment is as follows: after the lower cement-stabilized gravel layer 5 is laid, the upper cement-stabilized gravel layer 4 is laid, and then the dirt on the upper side is cleaned and the gravel seal layer 3 is laid. When laying the gravel seal layer 3, the lower asphalt layer 9 is first spread, and then the basalt fiber layer 8 is sprinkled on the lower asphalt layer 9. The basalt fiber layer 8 is composed of scattered basalt fiber filaments. Then, the upper asphalt layer 7 is spread on the upper side of the basalt fiber layer 8, and then sand and gravel aggregate is laid on the upper side of the upper asphalt layer 7. The sand and gravel aggregate constitute the sand and gravel aggregate layer 6, which is rolled and finally the pavement layer is laid.

[0027] In other embodiments of the present invention, to improve the tensile strength of the pavement structure for heavy-loaded vehicles, a basalt fiber grid layer can be laid between the upper basalt fiber reinforced concrete layer 1 and the lower basalt fiber reinforced concrete layer 2. This basalt fiber grid layer is composed of multiple horizontally arranged basalt fiber grids, with the adjacent ends of two adjacent basalt fiber grids having overlapping portions, and the overlapping portions of the two adjacent basalt fiber grids are overlapped together. Simultaneously, the overlapping portions of the two adjacent basalt fiber grids are tied together with wire, and each basalt fiber grid is fixed to the lower basalt fiber reinforced concrete layer 2 with U-shaped nails. When the upper basalt fiber reinforced concrete layer 1 is subjected to stress, the tensile stress in the pavement layer gradually increases from top to bottom. The basalt fiber grid layer can effectively offset the tensile stress and prevent further crack expansion.

[0028] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0030] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An anti-cracking basalt fiber asphalt pavement structure, comprising a cement stabilized macadam base layer and a pavement layer arranged on the upper side of the cement stabilized macadam base layer, characterized in that: A stone seal coat (3) is provided between the cement stabilized macadam base course and the pavement layer. The stone seal coat (3) comprises a sand and gravel aggregate layer (6), an upper asphalt layer (7), a basalt fiber layer (8), and a lower asphalt layer (9) arranged in sequence from top to bottom. The outer diameter of the sand and gravel particles in the sand and gravel aggregate layer (6) is smaller than the outer diameter of the sand and gravel particles in the pavement layer.

2. The anti-cracking basalt fiber asphalt pavement structure according to claim 1, wherein: The pavement layer comprises an upper basalt fiber reinforced concrete layer (1) and a lower basalt fiber reinforced concrete layer (2) located on the lower side of the upper basalt fiber reinforced concrete layer (1). The outer diameter of the sand and gravel particles in the upper basalt fiber reinforced concrete layer (1) is smaller than the outer diameter of the sand and gravel particles in the lower basalt fiber reinforced concrete layer (2).

3. The crack-resistant basalt fiber asphalt pavement structure according to claim 2, characterized in that: A basalt fiber grid layer is also laid between the upper basalt fiber reinforced concrete layer (1) and the lower basalt fiber reinforced concrete layer (2).

4. The crack-resistant basalt fiber asphalt pavement structure according to claim 3, characterized in that: The basalt fiber grid layer comprises a plurality of horizontally arranged basalt fiber grids. Adjacent ends of adjacent two basalt fiber grids have overlapping portions, and the overlapping portions of adjacent two basalt fiber grids are overlapped together.

5. The anti-cracking basalt fiber asphalt pavement structure according to claim 2, characterized in that: The thickness of the pavement layer is 11 cm to 13 cm.

6. The anti-cracking basalt fiber asphalt pavement structure according to claim 1, characterized in that: The spraying amount of basalt fibers in the basalt fiber layer (8) is 100 g / m 2 ~120 g / m 2 .

7. The anti-cracking basalt fiber asphalt pavement structure according to any one of claims 1 to 6, characterized in that: The cement stabilized macadam layer comprises a lower cement stabilized macadam layer (5) and an upper cement stabilized macadam layer (4) laid on the upper side of the lower cement stabilized macadam layer (5). The thickness of the upper cement stabilized macadam layer (4) is greater than the thickness of the lower cement stabilized macadam layer (5). The thickness of the cement stabilized macadam layer is 40 cm to 48 cm.

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