Crack-resistant basalt-fiber-grid-reinforced pavement structure

Abstract

A crack-resistant basalt-fiber-grid-reinforced pavement structure, comprising a cement-stabilized macadam base course and a pavement course arranged on the upper side of the cement-stabilized macadam base course. The pavement course comprises an upper basalt-fiber-reinforced concrete layer (1) and a lower basalt-fiber-reinforced concrete layer (3) located below the upper basalt-fiber-reinforced concrete layer (1). A first basalt-fiber-grid layer (4) is arranged between the lower basalt-fiber-reinforced concrete layer (3) and the cement-stabilized macadam base course. The outer diameter of sand and gravel particles in the upper basalt-fiber-reinforced concrete layer (1) is smaller than the outer diameter of sand and gravel particles in the lower basalt-fiber-reinforced concrete layer (3).

Description

A crack-resistant basalt fiber grid reinforced pavement structure Technical Field

[0001] The utility model relates to the field of road paving structures, in particular to a crack-resistant basalt fiber grid reinforced 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] Patent number CN201811495338.3, entitled "A Hybrid Basalt Fiber-Reinforced Concrete and Its Preparation Method," discloses a reinforced concrete layer mixed with basalt fiber. The concrete layer includes sand and asphalt mixed together, and the concrete layer also includes basalt fiber mixed with sand and asphalt. Basalt fiber, like reinforcing bars, can significantly improve the crack resistance and shear resistance of the concrete layer. However, using only a single layer of this basalt fiber-reinforced concrete layer cannot maximize the effect of the pavement structure layer, and the pavement layer has insufficient rutting resistance and fatigue resistance.

[0005] Utility Model Content

[0006] The purpose of the utility model is to provide a crack-resistant basalt fiber grid reinforced pavement structure to solve the technical problem in the prior art that the pavement layer has a single structure, resulting in weak rutting resistance and fatigue cracking resistance.

[0007] In order to solve the above technical problems, the technical solution of a basalt fiber grid reinforced pavement structure in the present invention is as follows:

[0008] A crack-resistant basalt fiber grid reinforced 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. 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. A first basalt fiber grid layer is arranged between the lower basalt fiber reinforced concrete layer and the cement-stabilized gravel base layer. 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.

[0009] In some embodiments, a second basalt fiber grid layer is disposed between the upper basalt fiber reinforced concrete layer and the lower basalt fiber reinforced concrete layer.

[0010] In some embodiments, the sum of the thicknesses of the upper basalt fiber reinforced concrete layer and the lower basalt fiber reinforced concrete layer is 11 cm to 13 cm.

[0011] In some embodiments, the cement-stabilized gravel base 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, and the thickness of the upper cement-stabilized gravel layer is greater than that of the lower cement-stabilized gravel layer.

[0012] In some embodiments, the first basalt fiber grid layer is composed of multiple horizontally arranged basalt fiber grids, the adjacent sides of two adjacent basalt fiber grids overlap by 0.2m to 0.3m, the overlapping positions of two adjacent basalt fiber grids are connected by metal wires, and each basalt fiber grid is fixed to the cement-stabilized gravel base by U-shaped nails.

[0013] The beneficial effects of the present invention are as follows: In the present invention, a lower basalt fiber reinforced concrete layer and an upper basalt fiber reinforced concrete layer mixed with basalt fiber are used to construct the pavement layer, making full use of the reinforcement, adsorption, stabilization and toughening 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 corresponding position of the upper basalt fiber reinforced concrete layer. The lower layer, i.e., the corresponding position of the lower basalt fiber reinforced concrete layer, can significantly improve the rutting resistance and fatigue resistance of the lower layer. The functions of each surface layer are different. The outer diameter of the sand and gravel particles in the lower layer is larger than that of the sand and gravel particles in the upper layer. The tensile stress of the surface layer gradually increases from top to bottom. At this time, the first basalt fiber grid layer on the upper side of the cement-stabilized gravel base can effectively offset the tensile stress and prevent further expansion of cracks. In the present invention, the performance of each functional layer is enhanced through structural changes, and basalt fiber grids are applied to the corresponding structural layers to improve the crack resistance and shear resistance of the pavement structural layer, thereby improving the high-temperature stability, low-temperature crack resistance, water stability, dynamic modulus and fatigue life of the asphalt mixture, and reducing the early diseases of asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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:

[0015] FIG1 is a schematic structural diagram of Example 1 of the present utility model;

[0016] FIG2 is a schematic diagram of fixing the first basalt fiber grid layer in FIG1 ;

[0017] FIG3 is a schematic structural diagram of Example 2 of the present utility model;

[0018] Explanation of the accompanying drawings: 1. upper basalt fiber reinforced concrete layer; 2. second basalt fiber grid layer; 3. lower basalt fiber reinforced concrete layer; 4. first basalt fiber grid layer; 5. upper cement-stabilized gravel layer; 6. lower cement-stabilized gravel layer; 7. basalt fiber grid; 8. overlapping portion; 9. metal wire; 10. U-shaped nail. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings illustrate preferred embodiments of the present invention. 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.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field 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.

[0021] An embodiment 1 of a crack-resistant basalt fiber grid reinforced pavement structure in the present invention is shown in Figures 1 and 2 : it comprises a cement-stabilized gravel base layer and a pavement layer arranged on the upper side of the cement-stabilized gravel base layer.

[0022] The cement-stabilized crushed stone base layer includes a lower cement-stabilized crushed stone layer 6 and an upper cement-stabilized crushed stone layer 5 laid on the upper side of the lower cement-stabilized crushed stone layer 6. The thickness of the upper cement-stabilized crushed stone layer 5 is greater than that of the lower cement-stabilized crushed stone layer 6. In this embodiment, the thickness of the lower cement-stabilized crushed stone layer 6 is 18 cm, and the thickness of the upper cement-stabilized crushed stone layer 5 is 36 cm.

[0023] The pavement layer includes an upper basalt fiber reinforced concrete layer 1 and a lower basalt fiber reinforced concrete layer 3 located below the upper basalt fiber reinforced concrete layer. The basalt fiber reinforced concrete layer refers to a concrete layer mixed with basalt fiber, which is a mixture of basalt fiber, asphalt, sand and gravel. The basalt fiber reinforced concrete layer belongs to the existing technology and its structure will not be described in detail here.

[0024] The outer diameter of the sand and stone particles in the upper basalt fiber reinforced concrete layer 1 is smaller than the outer diameter of the sand and stone particles in the lower basalt fiber reinforced concrete layer 3 .

[0025] A first basalt fiber grid layer 4 is provided between the lower basalt fiber reinforced concrete layer 3 and the upper cement-stabilized crushed stone layer 5. A second basalt fiber grid layer 2 is provided between the upper basalt fiber reinforced concrete layer 1 and the lower basalt fiber reinforced concrete layer 3. The combined thickness of the upper and lower basalt fiber reinforced concrete layers 1 and 3 is 12 cm.

[0026] During the specific production process, after the lower cement-stabilized gravel layer 6 is laid, the upper cement-stabilized gravel layer 5 is laid. After the upper cement-stabilized gravel layer 5 is laid, the dirt on the upper side is cleaned, emulsified asphalt is spread, and after demulsification and drying, the first basalt fiber grid layer 4 is laid. The first basalt fiber grid layer 4 is composed of multiple horizontally arranged basalt fiber grids 7. The adjacent ends of two adjacent basalt fiber grids 7 have overlapping portions 8. The overlapping portions 8 are 0.25m long. The overlapping portions 8 of two adjacent basalt fiber grids 7 are overlapped together. At the same time, the overlapping portions 8 of two adjacent basalt fiber grids 7 are tied together with metal wires 9. Each basalt fiber grid 7 is fixed to the cement-stabilized gravel base layer with U-shaped nails 10.

[0027] After the first basalt fiber grid layer 4 is laid, the lower basalt fiber reinforced concrete layer 3 is laid, and then the second basalt fiber grid layer 2 is laid on the upper end of the lower basalt fiber reinforced concrete layer 3. The laying process of the second basalt fiber grid layer 2 is the same as that of the first basalt fiber grid layer 4. Finally, the upper basalt fiber reinforced concrete layer 1 is laid on the upper side of the second basalt fiber grid layer 2. The crack-resistant basalt fiber grid reinforced pavement structure in this embodiment is a high-strength crack-resistant basalt fiber grid reinforced pavement structure.

[0028] During the construction process, the basalt fiber grid layer should be laid flat and dense, without curling or kinking during the laying process. The dorsal and ventral water-soluble substances of the basalt fiber grid 7 should be facing downwards, and the basalt fiber grid 7 should be kept flat and straightened without overlapping. Two adjacent basalt fiber grids 7 should be overlapped by 0.25m, and the overlapping parts 8 of the basalt fiber grids 7 should be connected with metal wire 9 (iron wire or aluminum wire). U-shaped nails 10 should be used to firmly fix the basalt fiber grid 7 to the ground every 1.5m to prevent displacement during construction. After the basalt fiber grid 7 is laid and fixed, use a roller to moderately roll it to stabilize it so that the grid is firmly bonded to the lower surface.

[0029] In this utility model, an upper basalt fiber-reinforced concrete layer 1 forms the upper layer of the pavement, while a lower basalt fiber-reinforced concrete layer 3 forms the lower layer. The addition of basalt fiber to the corresponding concrete layers fully utilizes the basalt fiber's reinforcement, adsorption, stabilization, and toughening properties to significantly improve the low-temperature crack resistance and water stability of the upper layer of the pavement structure. The lower layer primarily serves as the rutting and fatigue cracking resistance zone, with peak shear stress occurring in the lower layer. Basalt fiber significantly improves the rutting and fatigue resistance of this lower layer. As tensile stress in the surface layer gradually increases downward along the upper and lower layers, the first basalt fiber grid layer 4 effectively offsets this stress, preventing further crack propagation. In this embodiment, a first basalt fiber grid layer 4 and a second basalt fiber grid layer 2 are used. The use of two basalt fiber grid layers is particularly suitable for heavy traffic, i.e., road conditions with relatively heavy vehicles, providing the pavement structure with greater shear resistance. The second basalt fiber grid layer 2 located between the lower layer and the upper layer, combined with the basalt fiber-modified asphalt mixture, can effectively reduce the overall permanent deformation of the pavement and improve the rutting and shear resistance of the surface layer; the first basalt fiber grid layer 4 located between the cement-stabilized gravel base layer and the lower layer can effectively delay the expansion of reflective cracks caused by base shrinkage to the surface layer, help maintain the structural plate properties of the pavement and reduce transverse cracks in the pavement.

[0030] Example 2 of a basalt fiber grid reinforced pavement structure is shown in Figure 3: The difference between Example 2 and Example 1 is that the pavement structure in this embodiment is suitable for the passage of light-loaded vehicles, and there is no second basalt fiber grid layer 2 between the upper basalt fiber reinforced concrete layer 1 and the lower basalt fiber reinforced concrete layer 3.

[0031] In the above 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 intermediate medium; 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 can understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] 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 utility model 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 utility model.

[0033] 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.

[0034] 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. A crack-resistant basalt fiber grid-reinforced 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: The road surface layer includes an upper basalt fiber reinforced concrete layer (1) and a lower basalt fiber reinforced concrete layer (3) located below the upper basalt fiber reinforced concrete layer (1). A first basalt fiber grid layer (4) is provided between the lower basalt fiber reinforced concrete layer (3) and the cement stabilized macadam base layer. The outer diameter of the sand and stone particles in the upper basalt fiber reinforced concrete layer (1) is smaller than the outer diameter of the sand and stone particles in the lower basalt fiber reinforced concrete layer (3).

2. The crack-resistant basalt fiber grid-reinforced pavement structure according to claim 1, wherein: A second basalt fiber grid layer (2) is provided between the upper basalt fiber reinforced concrete layer (1) and the lower basalt fiber reinforced concrete layer (3).

3. The crack-resistant basalt fiber grid-reinforced pavement structure according to claim 1, wherein: The sum of the thicknesses of the upper basalt fiber reinforced concrete layer (1) and the lower basalt fiber reinforced concrete layer (3) is 11 cm to 13 cm.

4. The crack-resistant basalt fiber grid-reinforced pavement structure according to claim 1, wherein: The cement stabilized macadam base layer includes a lower layer cement stabilized macadam layer (6) and an upper layer cement stabilized macadam layer (5) laid on the upper side of the lower layer cement stabilized macadam layer (6). The thickness of the upper layer cement stabilized macadam layer (5) is greater than the thickness of the lower layer cement stabilized macadam layer (6).

5. The crack-resistant basalt fiber grid-reinforced pavement structure according to any one of claims 1 to 4, characterized in that: The first basalt fiber grid layer (4) is composed of a plurality of horizontally arranged basalt fiber grids (7). The adjacent sides of two adjacent basalt fiber grids (7) overlap by 0.2 m to 0.3 m. The overlapping positions of two adjacent basalt fiber grids (7) are connected by metal wires (9). Each basalt fiber grid (7) is fixed to the cement stabilized macadam base layer by U-shaped nails (10).

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