Basalt fiber reinforced drainage anti-crack pavement paving structure

Abstract

The utility model relates to the technical field of road and bridge construction, in particular to a basalt fiber reinforced drainage anti-crack pavement paving structure, which comprises a soil base and a reinforced concrete pavement, a low-dosage cement stabilized macadam subbase layer is paved above the soil base, a leveling layer is paved above the low-dosage cement stabilized macadam subbase layer, and a water drainage layer is paved above the leveling layer. An SBS hot asphalt macadam sealing layer is arranged between the leveling layer and the low-dosage cement stabilized macadam subbase layer, a drainage anti-crack multifunctional layer is laid on the leveling layer, and a reinforced concrete pavement is laid on the drainage anti-crack multifunctional layer; the basalt fiber reinforced drainage anti-crack pavement paving structure has the beneficial effects that the thickness of the basalt fiber reinforced drainage anti-crack pavement paving structure is equivalent to that of a conventional highway toll plaza paving structure, and the basalt fiber reinforced drainage anti-crack pavement paving structure is light in weight under the conditions that the drainage anti-crack concrete is small in density and the size is the same, so that the engineering cost is saved, and obvious economic value is achieved; and the drainage anti-crack concrete has excellent drainage and reflection crack resistance.

Description

Technical Field

[0001] The invention relates to the technical field of road and bridge construction, in particular to a basalt fiber reinforced drainage and crack-resistant road pavement structure. Background Art

[0002] The pavement structure of highway toll plazas is subject to heavy-loaded and slow-speed traffic. In order to improve the bearing capacity of the pavement, a solution combining reinforced concrete panels and cement-stabilized gravel base is generally adopted. The reinforced concrete panels bear the main loads and the lower bearing layer of cement-stabilized gravel shares the secondary loads. The two are tightly bonded together to form the pavement structure of the toll plaza.

[0003] In the prior art, cement-stabilized gravel shrinks due to construction and curing conditions, which causes cracks in the structure plate due to temperature shrinkage or shrinkage, affecting the properties of the structural plate. The cracking of the cement-stabilized gravel in the lower bearing layer can easily cause reflective cracks in the reinforced concrete panel of the upper bearing layer. In rainy and snowy weather, free water enters the pavement structure through the cracks in the top panel. Under the dynamic water pressure of driving, it can easily cause scouring of the lower bearing layer, causing the top panel to become hollow and the lower bearing layer to become loose. Such water damage seriously affects the service durability of the pavement structure and shortens its service life.

[0004] Therefore, at this stage, there is an urgent need to invent a structural solution that can prevent the cracks in cement-stabilized gravel from continuing to reflect upward and can promptly discharge the free water inside the pavement structure, so as to fundamentally solve the problem of water damage to the existing pavement structure. Summary of the invention

[0005] The object of the present invention is to provide a basalt fiber reinforced drainage and crack-resistant road pavement structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a basalt fiber reinforced drainage and crack-resistant pavement structure, comprising a soil base and a reinforced concrete pavement, a low-dose cement-stabilized gravel subbase is laid on the soil base, a leveling layer is laid on the low-dose cement-stabilized gravel subbase, an SBS hot asphalt gravel seal layer is arranged between the leveling layer and the low-dose cement-stabilized gravel subbase, a drainage and crack-resistant multifunctional layer is laid on the leveling layer, and the reinforced concrete pavement is laid on top of the drainage and crack-resistant multifunctional layer.

[0007] Preferably, the low-dose cement-stabilized crushed stone subbase strictly controls the amount of cement-binding materials added to the low-dose cement-stabilized crushed stone, and the unconfined compressive strength of the mixture is controlled between 3 and 5 MPa, thereby slowing down the occurrence of thermal shrinkage and shrinkage cracks.

[0008] Preferably, the SBS hot asphalt chip seal layer adopts SBS hot asphalt chip seal layer, including SBS hot asphalt and chipped stone, the SBS asphalt spreading amount is 0.8-1.2Kg / ㎡, the chipped stone with a particle size of 5-10mm is spread at a rate of 5-7Kg / ㎡, and the SBS hot asphalt and the chipped stone are constructed synchronously using a synchronous chip seal layer vehicle.

[0009] Preferably, the SBS hot asphalt chip seal 3 adheres the low-dose cement-stabilized chip base layer 2 and the leveling layer 4 together.

[0010] Preferably, the leveling layer is asphalt mortar, the asphalt is SBS modified asphalt, the asphalt dosage is 6.5-7.0% oil-rich asphalt mixture, the oil-rich asphalt mortar uses SBS modified asphalt grading with a maximum nominal particle size of 4.75 mm and a compacted thickness of 1-4 cm.

[0011] Preferably, the drainage and crack-resistant multifunctional layer includes mineral material, cement, and basalt fiber. The mineral material adopts two grades of 10-20mm and 5-10mm without admixture of fine aggregate to ensure that the mineral material has a connected porosity of 20-30%. The cement adopts slow-setting silicate cement with strength grade 32.5 or 42.5, and the admixture ratio is not more than 7% of the mass of the mineral material. The added basalt fiber has a length of 19mm and a diameter of 17μm, and the admixture amount accounts for 0.3-0.5% of the mass of the mineral material, to ensure that the 7d unconfined compressive strength of the drainage and crack-resistant concrete is not less than 5MPa.

[0012] Preferably, the flexural tensile strength of the reinforced concrete used in the reinforced concrete pavement is not less than 5Mpa.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The basalt fiber reinforced drainage and crack-resistant pavement structure proposed in the present invention is comparable to the thickness of the pavement structure layer of conventional highway toll plazas. The utility model patent not only has low density of drainage and crack-resistant concrete, light weight under the same volume, saves engineering cost and has obvious economic value, but also has excellent drainage and anti-reflective crack capabilities. The combination of drainage and crack-resistant concrete and asphalt mortar completely solves the problem of water damage caused by cracking of the pavement structure. The bearing capacity of the reinforced concrete structure on the top surface of the pavement can fully meet the needs of heavy-loaded slow-speed traffic. The pavement structure of the utility model has a more reasonable, durable and long-life structure and better economic and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a top view of the structure of the present invention;

[0017] Figure 3 for Figure 2 Structural cross-section at AA in the middle.

[0018] In the figure: soil base 1, low-dose cement-stabilized gravel subbase 2, SBS hot asphalt gravel seal layer 3, leveling layer 4, drainage and anti-cracking multifunctional layer 5, reinforced concrete pavement 6. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 3 The present invention provides a technical solution: a basalt fiber reinforced drainage and crack-resistant road pavement structure, comprising a soil base 1 and a reinforced concrete pavement 6, a low-dose cement-stabilized gravel subbase 2 is laid on the soil base 1, a leveling layer 4 is laid on the low-dose cement-stabilized gravel subbase 2, an SBS hot asphalt gravel seal layer 3 is arranged between the leveling layer 4 and the low-dose cement-stabilized gravel subbase 2, a drainage and crack-resistant multifunctional layer 5 is laid on the leveling layer 4, and the reinforced concrete pavement 6 is laid on the drainage and crack-resistant multifunctional layer 5.

[0021] The technical index requirements of soil subgrade 1 must meet the relevant technical requirements of the "Technical Specifications for Highway Subgrade Construction" (JTG / T3610-2019), and the strength of the subgrade soil can effectively support the pavement structure; the technical index requirements of the low-dose cement-stabilized crushed stone 2 mentioned above must meet the "Technical Specifications for Highway Pavement Base Construction" (JTG / T F20-2015) related technical requirements, strictly control the amount of low-dose cement stabilized crushed stone mixed with cement binder, the unconfined compressive strength of the mixture is controlled between 3 and 5 MPa to slow down the occurrence of its own thermal shrinkage and shrinkage cracks; the SBS hot asphalt crushed stone seal layer 3 adopts SBS hot asphalt crushed stone seal layer, the SBS asphalt spreading amount is 0.8-1.2 kg / ㎡, the crushed stone with a particle size of 5-10 mm is spread at 5-7 kg / ㎡, SBS hot asphalt and crushed stone are synchronously constructed by synchronous crushed stone seal layer vehicles, SBS hot asphalt crushed stone seal layer 3 can effectively bond the low-dose cement stabilized crushed stone subbase 2 and the leveling layer 4 together, and play an effective waterproof bonding effect; the leveling layer 4 is asphalt mortar, the asphalt adopts SBS modified asphalt, the asphalt dosage is 6.5-7.0% oil-rich asphalt mixture, and the gradation range meets the "Technical Specifications for Highway Asphalt Pavement Construction" (JTGF40-2004) Table 5.3.2 -2AC-5 technical index requirements, oil-rich asphalt mortar uses SBS modified asphalt grading with a maximum nominal particle size of 4.75mm and a compaction thickness of 1 to 4cm. These characteristics ensure that the asphalt mortar has the ability to adjust the unevenness of the underlying layer and has large deformation and fatigue resistance, and has leveling and fatigue resistance characteristics; the drainage and crack-resistant multifunctional layer 5, the mineral material uses 10-20mm and 5-10mm two grades without fine aggregate to ensure that the mineral material has a connected porosity of 20-30%, the cement uses strength grade 32.5 or 42.5 slow-setting silicate cement with a mixing ratio of no more than 7% of the mineral material mass, and the added basalt fiber uses a length of 19mm and a diameter of 17μm, accounting for 0.3-0.5% of the mineral material mass, ensuring that the drainage and crack-resistant concrete 7d unconfined compressive strength is not less than 5MPa; the technical indicators of the reinforced concrete panel 6 meet the "Technical Specifications for Highway Cement Concrete Pavement Construction" (JTG / T F30-2014) related technical indicators require that the flexural tensile strength of reinforced concrete should not be less than 5MPa to ensure that the pavement has sufficient bearing capacity.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A basalt fiber reinforced drainage and crack-resistant pavement structure, comprising a soil base (1) and a reinforced concrete pavement (6), characterized in that: A low-dose cement-stabilized crushed stone subbase (2) is laid on the soil base (1), a leveling layer (4) is laid on the low-dose cement-stabilized crushed stone subbase (2), an SBS hot asphalt crushed stone seal layer (3) is provided between the leveling layer (4) and the low-dose cement-stabilized crushed stone subbase (2), a drainage and crack-resistant multifunctional layer (5) is laid on the leveling layer (4), and a reinforced concrete pavement (6) is laid on the drainage and crack-resistant multifunctional layer (5), wherein the drainage and crack-resistant multifunctional layer (5) comprises mineral materials, cement, and basalt fiber.

2. The basalt fiber reinforced drainage and crack-resistant pavement structure according to claim 1, characterized in that: The low-dose cement-stabilized crushed stone subbase (2) strictly controls the amount of cement-binding material added to the low-dose cement-stabilized crushed stone, and the unconfined compressive strength of the mixture is controlled between 3 and 5 MPa, thereby slowing down the occurrence of thermal shrinkage and drying shrinkage cracks.

3. The basalt fiber reinforced drainage and crack-resistant pavement structure according to claim 1, characterized in that: The SBS hot asphalt chip seal (3) adopts SBS hot asphalt chip seal, including SBS hot asphalt and chip, the SBS asphalt spreading amount is 0.8-1.2 kg / m2, the chip with a particle size of 5-10 mm is spread at 5-7 kg / m2, and the SBS hot asphalt and the chip are constructed synchronously by a synchronous chip seal vehicle.

4. The basalt fiber reinforced drainage and crack-resistant pavement structure according to claim 1, characterized in that: The SBS hot asphalt chip seal (3) bonds the low-dose cement-stabilized chip base (2) and the leveling layer (4) together.

5. The basalt fiber reinforced drainage and crack-resistant pavement structure according to claim 1, characterized in that: The leveling layer (4) is asphalt mortar, the asphalt is SBS modified asphalt, the asphalt dosage is 6.5-7.0% oil-rich asphalt mixture, the oil-rich asphalt mortar uses SBS modified asphalt with a maximum nominal particle size of 4.75 mm and a compacted thickness of 1-4 cm.

6. The basalt fiber reinforced drainage and crack-resistant pavement structure according to claim 1, characterized in that: The reinforced concrete used in the reinforced concrete pavement (6) has a bending tensile strength of not less than 5 MPa.

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