Asphalt pavement structure containing blast furnace slag powder-fly ash large-particle-size macadam base

Abstract

The utility model relates to the technical field of road structures, and provides an asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle-size macadam base. The asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle-size macadam base layer comprises a bottom cushion layer, the blast furnace slag powder-fly ash large-particle-size macadam base layer and an asphalt mixture layer, and the blast furnace slag powder-fly ash large-particle-size macadam base layer is arranged on the upper side of the bottom cushion layer; and the asphalt mixture layer is arranged on the upper side of the blast furnace slag powder-fly ash large-particle-size macadam base layer. By adopting the blast furnace slag powder-fly ash large-particle-size macadam base layer, on one hand, the risk of cracking of the base layer is reduced, and on the other hand, the bearing capacity of the base layer is improved due to direct mutual contact of large-particle-size macadam, so that the asphalt pavement structure has high strength and anti-cracking performance and can tolerate a more stringent use environment, and the service life of the asphalt pavement structure is prolonged. Meanwhile, the service life of the asphalt pavement is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of road structures, in particular to an asphalt pavement structure containing a blast furnace slag powder-fly ash large-diameter crushed stone base. Background Art

[0002] The traditional asphalt pavement structure uses a water-stable base (i.e. cement-stabilized crushed stone base) as the main form of the road pavement base. The water-stable base is a structural layer obtained by paving and compacting graded crushed stone as aggregate, using a certain amount of cement material and sufficient mortar to fill the gaps in the aggregate according to the principle of interlocking and squeezing. The water-stable base is a semi-rigid structure with the advantages of high strength and good stability. Its disadvantage is that it is prone to shrinkage cracks, and the bearing capacity is insufficient under heavy traffic, resulting in deformation, looseness, and cracking and sinking.

[0003] When steel is produced, coal is used as the basic fuel for electricity production. Therefore, a large amount of blast furnace slag and fly ash are produced every year. These solid wastes not only occupy land resources, but also bring great safety hazards to the ecological environment. Utility Model Content

[0004] The utility model provides an asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle crushed stone base, which is used to solve any of the above-mentioned defects in the prior art and ensure that the structure of the asphalt pavement containing a blast furnace slag powder-fly ash large-particle crushed stone base has both structural strength and effective crack resistance.

[0005] The utility model provides an asphalt pavement structure, comprising: a bottom cushion layer, a blast furnace slag powder-fly ash large-particle crushed stone base layer and an asphalt mixture layer, wherein the blast furnace slag powder-fly ash large-particle crushed stone base layer is arranged on the upper side of the bottom cushion layer, the asphalt mixture layer is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base layer, and the asphalt mixture layer is suitable for directly contacting with automobile tires.

[0006] According to the asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle crushed stone base provided by the utility model, it also includes a graded crushed stone leveling layer; the bottom cushion layer is a cement concrete crushed stone layer, and the graded crushed stone leveling layer is arranged between the cement concrete crushed stone layer and the blast furnace slag powder-fly ash large-particle crushed stone base, and the thickness of the graded crushed stone leveling layer is 4cm-8cm.

[0007] The asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle crushed stone base layer provided by the utility model also includes a crushed stone sealing layer, which is arranged between the blast furnace slag powder-fly ash large-particle crushed stone base layer and the asphalt mixture layer; the thickness of the crushed stone sealing layer is 1cm-1.6cm.

[0008] According to the asphalt pavement structure containing blast furnace slag powder-fly ash large-particle crushed stone base provided by the utility model, it also includes a stress absorption layer, which is arranged between the blast furnace slag powder-fly ash large-particle crushed stone base and the asphalt mixture layer; the thickness of the stress absorption layer is 2cm-3cm.

[0009] The asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model also includes a graded crushed stone cushion layer; the bottom cushion layer is a water-stable base layer, the graded crushed stone cushion layer is arranged on the lower side of the water-stable base layer, and the thickness of the graded crushed stone cushion layer is 15cm-20cm.

[0010] According to the asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle crushed stone base provided by the utility model, the asphalt mixture layer includes an asphalt mixture upper layer and an asphalt mixture lower layer; the asphalt mixture upper layer is suitable for contacting the automobile tires, the asphalt mixture upper layer is arranged on the upper side of the asphalt mixture lower layer, and the asphalt mixture lower layer is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base.

[0011] According to the asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model, the asphalt mixture layer also includes an asphalt mixture middle surface layer, and the asphalt mixture middle surface layer is arranged between the asphalt mixture upper layer and the asphalt mixture lower layer.

[0012] According to the asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model, the material of the upper layer of the asphalt mixture is AC-13 asphalt mixture or SMA-13 ​​asphalt mixture;

[0013] The material of the surface layer of the asphalt mixture is AC-20 asphalt mixture;

[0014] The material of the lower layer of the asphalt mixture is ATB-25 asphalt mixture or AC-20 asphalt mixture.

[0015] According to the asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model, the thickness of the upper layer of the asphalt mixture is 3.5cm-4cm, the thickness of the middle layer of the asphalt mixture is 5cm-7cm, and the thickness of the lower layer of the asphalt mixture is 6cm-8cm.

[0016] According to the asphalt pavement structure containing blast furnace slag powder-fly ash large-particle crushed stone base provided by the utility model, the thickness of the blast furnace slag powder-fly ash large-particle crushed stone base is 18cm-24cm.

[0017] The utility model provides an asphalt pavement structure containing a blast furnace slag powder-fly ash large-particle crushed stone base, which adopts a blast furnace slag powder-fly ash large-particle crushed stone base. On the one hand, the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base has a high proportion and less fine-grained aggregate, which reduces the risk of cracking of the base; on the other hand, since the large-particle crushed stones in the blast furnace slag powder-fly ash large-particle crushed stone base are in direct contact with each other, the bearing capacity of the base is improved, thereby making the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base have both high strength and crack resistance, so that the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base can withstand a more severe use environment, while improving the life of the asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model;

[0020] Figure 2 Another cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model;

[0021] Figure 3 Another cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model;

[0022] Figure 4 Another cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model;

[0023] Figure 5 Another cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model;

[0024] Figure 6 Another cross-sectional view of an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base provided by the utility model.

[0025] Reference numerals:

[0026] 10. Asphalt mixture layer; 11. Asphalt mixture upper layer; 12. Asphalt mixture lower layer; 13. Asphalt mixture middle layer; 20. Blast furnace slag powder-fly ash large-size crushed stone base layer; 30. Graded crushed stone leveling layer; 40. Cement concrete crushed stone layer; 50. Crushed stone sealing layer; 60. Stress absorption layer; 70. Graded crushed stone cushion layer; 80. Water-stabilized base layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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 embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0029] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Refer to the following Figures 1 to 6 The asphalt pavement structure containing blast furnace slag powder-fly ash large-particle crushed stone base according to the embodiment of the utility model is described. This pavement structure has good stability and bearing capacity, and can effectively improve the service life and driving comfort of the road. Therefore, the asphalt pavement structure containing blast furnace slag powder-fly ash large-particle crushed stone base can be used in maintenance projects and new pavement projects.

[0032] like Figure 1 As shown, the asphalt pavement structure of the blast furnace slag powder-fly ash large-particle crushed stone base 20 provided by the utility model includes a bottom cushion layer, a blast furnace slag powder-fly ash large-particle crushed stone base 20 and an asphalt mixture layer 10. The asphalt mixture layer 10 is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base 20, and the asphalt mixture layer 10 is suitable for direct contact with automobile tires. Using blast furnace slag powder and fly ash large-particle crushed stone as the base material of the pavement structure can provide the pavement structure with good bearing capacity and anti-deformation performance, and enhance the stability and bearing capacity of the pavement. The asphalt mixture layer 10 can provide the pavement with better friction performance and comfort, reduce driving noise and provide a good driving experience.

[0033] According to the asphalt pavement structure of the blast furnace slag powder-fly ash large-particle crushed stone base 20 of the utility model, the blast furnace slag powder-fly ash large-particle crushed stone base 20 is adopted. On the one hand, the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 accounts for a high proportion, and the fine-grained aggregate is small, which reduces the risk of cracking of the base; on the other hand, since the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 is in direct contact with each other, the bearing capacity of the base is improved, thereby making the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 have both high strength and crack resistance, so that the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 can withstand a more severe use environment, while improving the service life of the pavement.

[0034] like Figure 1 and Figure 2 As shown, in some embodiments of the utility model, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 also includes a graded crushed stone leveling layer 30; in this embodiment, the bottom cushion layer can be a cement concrete crushed stone layer 40, specifically, the cement concrete crushed stone layer 40 is formed by crushing the cement concrete board. The cement concrete crushed stone layer 40 can be formed by crushing the original cement concrete board of the road surface with a multi-hammer cement board crusher. In this way, the resources of the old cement road surface can be effectively utilized and the demand for new materials in the road surface construction process can be reduced. The graded crushed stone leveling layer 30 is arranged between the cement concrete crushed stone layer 40 and the blast furnace slag powder-fly ash large-particle crushed stone base 20. The thickness of the graded crushed stone leveling layer 30 can be 4cm-8cm. For example, in this embodiment, the thickness of the graded crushed stone leveling layer 30 can be 5cm.

[0035] like Figure 2 As shown, in some embodiments of the utility model, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 also includes a crushed stone seal layer 50, and the crushed stone seal layer 50 is arranged between the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 and the asphalt mixture layer 10. The crushed stone seal layer 50 can fill the gaps and uneven surfaces in the blast furnace slag powder-fly ash large-particle crushed stone base layer 20, increase the density and flatness of the base layer, and thus improve the adhesion and durability of the asphalt mixture layer 10.

[0036] This design can effectively improve the quality and service life of the road surface, and reduce problems such as road damage and vehicle driving discomfort caused by uneven or defective base layers. At the same time, the chip seal 50 can also disperse the load, protect the base layer, and improve the bearing capacity and stability of the road surface. The thickness of the chip seal 50 can be 1 cm to 1.6 cm, and the specific thickness can be adjusted according to the road surface design requirements and material availability. For example, in this embodiment, the thickness of the chip seal 50 can be 1.4 cm.

[0037] like Figure 3 As shown, in some embodiments of the utility model, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 also includes a stress absorption layer 60, which is arranged between the blast furnace slag powder-fly ash large-particle crushed stone base 20 and the asphalt mixture layer 10; the stress absorption layer 60 can absorb the thermal expansion and contraction stress caused by the dynamic load and temperature change of the pavement, reduce the influence of stress on the blast furnace slag powder-fly ash large-particle crushed stone base 20 and the asphalt mixture layer 10 structure, and improve the durability and safety of the pavement. This design can effectively reduce the risk of cracking and deformation of the pavement, extend the service life of the pavement, and improve driving comfort and safety.

[0038] The stress absorbing layer 60 can be made of a flexible material so that the stress absorbing layer 60 has good elasticity and deformation capacity, can absorb and disperse loads and stresses, and reduce the influence of stresses on the pavement structure. The thickness of the stress absorbing layer 60 can be 2 cm to 3 cm, and the specific thickness can be adjusted according to the pavement design requirements and material availability. For example, in this embodiment, the thickness of the stress absorbing layer 60 can be 2.5 cm.

[0039] like Figure 4 and Figure 5 As shown, in some embodiments of the utility model, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-size crushed stone base 20 also includes a graded crushed stone cushion layer 70; wherein the bottom cushion layer can be a water-stable base layer 80, and the graded crushed stone cushion layer 70 is located below the water-stable base layer 80, and the thickness of the graded crushed stone cushion layer 70 can be 15 cm to 20 cm. For example, in this embodiment, the thickness of the graded crushed stone cushion layer 70 can be 20 cm. The graded crushed stone cushion layer 70 can disperse the load of the pavement structure and provide waterproof and drainage functions, which helps to maintain the stability and durability of the pavement.

[0040] like Figure 6 As shown, in some embodiments of the utility model, the asphalt mixture layer 10 includes an asphalt mixture upper layer 11 and an asphalt mixture lower layer 12; wherein, the asphalt mixture upper layer 11 is arranged on the upper side of the asphalt mixture lower layer 12, and the asphalt mixture upper layer 11 can be made of fine asphalt mixture, and the asphalt mixture upper layer 11 is suitable for contacting with automobile tires to provide good friction and anti-skid performance, thereby ensuring that the vehicle has good control and stability during driving.

[0041] The asphalt mixture lower layer 12 is arranged on the upper side of the blast furnace slag powder-fly ash large-size crushed stone base layer 20. The asphalt mixture lower layer 12 can be made of coarse asphalt mixture to increase the bearing capacity and stability of the road surface.

[0042] like Figure 6 As shown, in some embodiments of the present invention, the asphalt mixture layer 10 further includes an asphalt mixture middle surface layer 13, which is disposed between the asphalt mixture upper layer 11 and the asphalt mixture lower layer 12. The asphalt mixture middle surface layer 13 can disperse and bear the traffic load, thereby increasing the stability of the asphalt mixture layer 10 structure, reducing the occurrence of pavement cracks and deformation to a certain extent, and improving the bearing capacity and durability of the pavement.

[0043] like Figure 6As shown, in some embodiments of the present invention, the material of the asphalt mixture upper layer 11 can be AC-13 asphalt mixture; or, in other embodiments, the material of the asphalt mixture upper layer 11 can be SMA-13 ​​asphalt mixture; so that the asphalt mixture upper layer 11 has higher density and durability and can withstand high vehicle traffic and heavy loads.

[0044] In some embodiments of the present invention, the material of the asphalt mixture middle surface layer 13 can be AC-20 asphalt mixture, so that the asphalt mixture middle surface layer 13 has higher strength and deformation resistance, thereby ensuring the stability and durability of the pavement structure.

[0045] In some embodiments of the present invention, the material of the asphalt mixture lower layer 12 can be ATB-25 asphalt mixture; or, in some other embodiments, the material of the asphalt mixture lower layer 12 can be AC-20 asphalt mixture, so that the asphalt mixture lower layer 12 has a higher bearing capacity and better deformation resistance.

[0046] like Figure 6 As shown, in some embodiments of the present invention, the thickness of the upper layer 11 of the asphalt mixture can be 3.5cm-4cm. For example, in this embodiment, the thickness of the upper layer 11 of the asphalt mixture can be 4cm; the thickness of the middle layer 13 of the asphalt mixture can be 5cm-7cm. For example, in this embodiment, the thickness of the middle layer 13 of the asphalt mixture can be 6cm; the thickness of the lower layer 12 of the asphalt mixture can be 6cm-8cm, for example, in this embodiment, the thickness of the lower layer 12 of the asphalt mixture can be 6cm.

[0047] like Figure 6 As shown, in some embodiments of the present invention, the thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 can be 18cm-24cm. For example, in this embodiment, the thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 can be 20cm.

[0048] The present invention is described below by the best embodiment. It should be known to those skilled in the art that the embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In the embodiments, unless otherwise specified, the means used are all technical means known to those skilled in the art.

[0049] Example 1

[0050] Example 1 corresponds to a maintenance project.

[0051] See also Figures 1 to 3Embodiment 1 of the utility model proposes an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base 20. The asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base 20 comprises a cement concrete crushed stone layer 40, a blast furnace slag powder-fly ash large-size crushed stone base 20 and an asphalt mixture layer 10, wherein the blast furnace slag powder-fly ash large-size crushed stone base 20 is arranged on the upper side of the cement concrete crushed stone layer 40, and the asphalt mixture layer 10 is arranged on the upper side of the blast furnace slag powder-fly ash large-size crushed stone base 20.

[0052] The cement concrete rubble layer 40 is formed by rubble-forming cement concrete slabs. Usually, a multi-hammer cement slab crusher can be used to rubble the original cement concrete slabs on the road surface to form the cement concrete rubble layer 40. The thickness of the cement concrete rubble layer 40 is usually 18 cm to 25 cm. For example, in this embodiment, the thickness of the cement concrete rubble layer 40 is 20 cm.

[0053] The blast furnace slag powder-fly ash large-grained stone base layer 20 refers to a skeleton structure with large-grained stone (it should be noted that the maximum particle size of large-grained stone is not more than 73mm) as the base layer, blast furnace slag powder and fly ash as cementitious materials, and smaller-grained aggregates, so that the entire base structure forms a skeleton-dense structure. On the one hand, in the blast furnace slag powder-fly ash large-grained stone base layer 20, large-grained stone accounts for a high proportion and fine-grained aggregate is less, which reduces the risk of cracking of the base layer; on the other hand, in the blast furnace slag powder-fly ash large-grained stone base layer 20, since large-grained stone directly contacts each other, the bearing capacity of the base layer is improved.

[0054] In addition, since large-size crushed stones are used to pave the blast furnace slag powder-fly ash large-size crushed stone base layer 20, the amount of cementitious materials such as slag powder and fly ash combined in the base layer is reduced, and the engineering cost is reduced. It can be seen that the embodiment of the utility model reduces the risk of base layer cracking by using the blast furnace slag powder-fly ash large-size crushed stone base layer 20, and alleviates the problem of asphalt pavement cracking caused by reflective cracks.

[0055] The thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 may be 18-24 cm. For example, in this embodiment, the thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 is 20 cm.

[0056] In this embodiment, the asphalt mixture layer 10 includes an asphalt mixture upper layer 11 and an asphalt mixture lower layer 12. The asphalt mixture upper layer 11 can be made of fine asphalt mixture, and the asphalt mixture upper layer 11 is suitable for contacting with automobile tires to provide good friction and anti-skid performance, ensuring that the vehicle has good control and stability during driving.

[0057] The asphalt mixture lower layer 12 is arranged on the lower side of the asphalt mixture upper layer 11, and the asphalt mixture lower layer 12 is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20. The asphalt mixture lower layer 12 can be made of coarse asphalt mixture to increase the bearing capacity and stability of the road surface.

[0058] Specifically, the material of the asphalt mixture upper layer 11 is AC-13 asphalt mixture or SMA-13 ​​asphalt mixture. For example, in this embodiment, the material of the asphalt mixture upper layer 11 is AC-13 asphalt mixture.

[0059] The thickness of the asphalt mixture upper layer 11 is 3.5-4 cm. For example, in this embodiment, the thickness of the asphalt mixture upper layer 11 is 4 cm.

[0060] The material of the asphalt mixture lower layer 12 is ATB-25 asphalt mixture or AC-20 asphalt mixture. For example, in this embodiment, the material of the asphalt mixture lower layer 12 is ATB-25 asphalt mixture.

[0061] The thickness of the asphalt mixture lower layer 12 is 6-8 cm. For example, in this embodiment, the thickness of the asphalt mixture lower layer 12 is 8 cm.

[0062] The particle size of the asphalt mixture lower layer 12 is larger than that of the asphalt mixture upper layer 11 . The maximum particle size of the asphalt mixture lower layer 12 may be 25 mm, thereby providing a load-bearing foundation for the asphalt mixture upper layer 11 .

[0063] The asphalt mixture upper layer 11 is a layer that directly contacts with the automobile tires. The particle size of the asphalt mixture upper layer 11 is smaller than the particle size of the asphalt mixture lower layer 12. The maximum particle size of the asphalt mixture upper layer 11 may be 13.2 mm.

[0064] Furthermore, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 also includes a graded crushed stone leveling layer 30. The graded crushed stone leveling layer 30 is arranged between the cement concrete crushed stone layer 40 and the blast furnace slag powder-fly ash large-particle crushed stone base 20, and the thickness of the graded crushed stone leveling layer 30 is 4-8 cm. For example, in this embodiment, the thickness of the crushed stone leveling layer is 5 cm. The graded crushed stone leveling layer 30 can fill the potholes of the cement concrete crushed stone layer 40 and improve the flatness of the cement concrete crushed stone layer 40. In addition, the graded crushed stone leveling layer 30 can also slow down the upward reflection of the residual stress of the cement concrete crushed stone layer 40, reducing the risk of cracking of the blast furnace slag powder-fly ash large-particle crushed stone base 20.

[0065] According to the asphalt pavement structure of the blast furnace slag powder-fly ash large-particle crushed stone base 20 of the utility model, the blast furnace slag powder-fly ash large-particle crushed stone base 20 is adopted. On the one hand, the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 accounts for a high proportion, and the fine-grained aggregate is small, which reduces the risk of cracking of the base; on the other hand, since the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 is in direct contact with each other, the bearing capacity of the base is improved, thereby making the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 have both high strength and crack resistance, so that the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 can withstand a more severe use environment, while improving the service life of the pavement.

[0066] Further, see Figure 2 The asphalt pavement structure containing the blast furnace slag powder-fly ash large-size crushed stone base 20 also includes a crushed stone seal layer 50, which is arranged between the blast furnace slag powder-fly ash large-size crushed stone base 20 and the asphalt mixture layer 10, and the thickness of the crushed stone seal layer 50 is 1-1.6 cm. The crushed stone seal layer 50 is made of crushed stone and asphalt binder, wherein the crushed stone can be a single particle size aggregate of 13.2-19 cm, and the asphalt binder can be rubber asphalt, SBS modified asphalt, etc.

[0067] On the one hand, the chip seal 50 can further reduce the stress reflected from the blast furnace slag powder-fly ash large-particle crushed stone base 20 to the asphalt mixture layer 10, thereby reducing the risk of reflection cracks in the asphalt mixture layer 10. On the other hand, the chip seal 50 can reduce the impact of water on the underlying structure and improve the durability of the pavement structure. In addition, the chip seal 50 improves the connection between the blast furnace slag powder-fly ash large-particle crushed stone base 20 and the asphalt mixture layer 10, thereby improving the overall stability of the pavement structure.

[0068] Or, in some other examples of this embodiment, see Figure 3The asphalt pavement structure containing the blast furnace slag powder-fly ash large-size crushed stone base 20 also includes a stress absorption layer 60, which is arranged between the blast furnace slag powder-fly ash large-size crushed stone base 20 and the asphalt mixture layer 10. The stress absorption layer 60 is an asphalt mixture composed of fine aggregate, mineral filler and high elastic polymer modified asphalt binder. After forming, the stress absorption layer 60 is dense, has strong bonding force and is impermeable to water. It has good bonding performance with the blast furnace slag powder-fly ash large-size crushed stone base 20, can deform with the deformation of the blast furnace slag powder-fly ash large-size crushed stone base 20, and has excellent self-healing ability. The maximum particle size of the aggregate used in the stress absorption layer 60 is not greater than 9.5 mm; the asphalt in the stress absorption layer 60 can be high-viscosity asphalt, rubber asphalt, etc.; the oil-stone ratio of the stress absorption layer 60 can be 8.5-10.5%. For example, the oil-stone ratio of the stress absorption layer 60 in this embodiment can be 9.5%.

[0069] The thickness of the stress absorbing layer 60 is 2-3 cm. For example, in this embodiment, the thickness of the stress absorbing layer 60 is 2.5 cm.

[0070] The stress absorbing layer 60 has the characteristics of high elasticity, high toughness and impermeability. These special properties enable the stress absorbing layer 60 to disperse the concentrated stress in the crack area of ​​the pavement structure to a larger area, reduce the stress peak, and play the effect of delaying the time of the appearance of the reflective cracks and slowing down the expansion speed of the reflective cracks. The stress absorbing layer 60 can also resist great deformation without breaking, and can isolate the road surface water from penetrating downward, and can also be well bonded to the blast furnace slag powder-fly ash large-particle crushed stone base 20, thereby increasing the fatigue life of the blast furnace slag powder-fly ash large-particle crushed stone base 20.

[0071] Example 2

[0072] Example 2 corresponds to a new pavement project.

[0073] See also Figures 4 to 6 , Embodiment 2 of the utility model proposes an asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base 20. The asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base 20 comprises a graded crushed stone cushion layer 70, a water-stable base layer 80, a blast furnace slag powder-fly ash large-size crushed stone base layer 20 and an asphalt mixture layer 10, wherein the blast furnace slag powder-fly ash large-size crushed stone base layer 20 is arranged on the upper side of the water-stable base layer 80, the asphalt mixture layer 10 is arranged on the upper side of the blast furnace slag powder-fly ash large-size crushed stone base layer 20, and the graded crushed stone cushion layer 70 is arranged on the lower side of the water-stable base layer 80.

[0074] The thickness of the graded crushed stone cushion layer 70 may be 15-20 cm. For example, in this embodiment, the thickness of the graded crushed stone cushion layer 70 is 20 cm. The maximum particle size of the crushed stones in the graded crushed stone cushion layer 70 is not greater than 37.5 mm. The graded crushed stone cushion layer 70 can enhance the strength of the pavement structure and provide a waterproof and drainage function for the pavement structure.

[0075] The water-stable base layer 80 is a structural layer obtained by paving and compacting the aggregates with graded crushed stones, a certain amount of cement materials and sufficient mortar to fill the gaps between the aggregates according to the interlocking principle. The thickness is usually 18-25 cm. For example, in this embodiment, the thickness of the water-stable base layer 80 is 20 cm.

[0076] The blast furnace slag powder-fly ash large-grained stone base layer 20 refers to a skeleton structure with large-grained stone (it should be noted that the maximum particle size of large-grained stone is not more than 73mm) as the base layer, blast furnace slag powder and fly ash as cementitious materials, and smaller-grained aggregates, so that the entire base structure forms a skeleton-dense structure. On the one hand, in the blast furnace slag powder-fly ash large-grained stone base layer 20, large-grained stone accounts for a high proportion and fine-grained aggregate is less, which reduces the risk of cracking of the base layer; on the other hand, in the blast furnace slag powder-fly ash large-grained stone base layer 20, since large-grained stone directly contacts each other, the bearing capacity of the base layer is improved.

[0077] In addition, since large-size crushed stones are used to pave the blast furnace slag powder-fly ash large-size crushed stone base layer 20, the amount of cementitious materials such as slag powder and fly ash combined in the base layer is reduced, and the engineering cost is reduced. It can be seen that the embodiment of the utility model reduces the risk of base layer cracking by using the blast furnace slag powder-fly ash large-size crushed stone base layer 20, and alleviates the problem of asphalt pavement cracking caused by reflective cracks.

[0078] The thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 is 18-24 cm. For example, in this embodiment, the thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer 20 is 20 cm.

[0079] In this embodiment, the asphalt mixture layer 10 includes an asphalt mixture upper layer 11 , an asphalt mixture middle layer 13 and an asphalt mixture lower layer 12 , and the asphalt mixture middle layer 13 is disposed between the asphalt mixture upper layer 11 and the asphalt mixture lower layer 12 .

[0080] The material of the upper layer 11 of the asphalt mixture is AC-13 asphalt mixture or SMA-13 ​​asphalt mixture. For example, in this embodiment, the material of the upper layer 11 of the asphalt mixture is AC-13 asphalt mixture. The material of the surface layer 13 of the asphalt mixture is AC-20 asphalt mixture. The material of the lower layer 12 of the asphalt mixture is ATB-25 asphalt mixture or AC-20 asphalt mixture. For example, in this embodiment, the material of the lower layer 12 of the asphalt mixture is ATB-25 asphalt mixture.

[0081] The thickness of the upper layer 11 of the asphalt mixture is 3.5-4 cm. For example, in this embodiment, the thickness of the upper layer 11 of the asphalt mixture is 4 cm. The thickness of the middle layer 13 of the asphalt mixture is 5-7 cm. For example, in this embodiment, the thickness of the middle layer 13 of the asphalt mixture is 6 cm. The thickness of the lower layer 12 of the asphalt mixture is 6-8 cm. For example, in this embodiment, the thickness of the lower layer 12 of the asphalt mixture is 7 cm.

[0082] The particle size of the asphalt mixture lower layer 12 is larger than that of the asphalt mixture upper layer 11 . The maximum particle size of the asphalt mixture lower layer 12 may be 25 mm, thereby providing a load-bearing foundation for the asphalt mixture upper layer 11 .

[0083] The asphalt mixture upper layer 11 is a layer that directly contacts with the automobile tires. The particle size of the asphalt mixture upper layer 11 is smaller than the particle size of the asphalt mixture lower layer 12. The maximum particle size of the asphalt mixture upper layer 11 may be 13.2 mm.

[0084] The particle size of the asphalt mixture surface layer 13 is between the asphalt mixture upper layer 11 and the asphalt mixture lower layer 12 .

[0085] Furthermore, the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 also includes a graded crushed stone leveling layer 30. The graded crushed stone leveling layer 30 is arranged between the cement concrete crushed stone layer 40 and the blast furnace slag powder-fly ash large-particle crushed stone base 20, and the thickness of the graded crushed stone leveling layer 30 is 4-8 cm. For example, in this embodiment, the thickness of the crushed stone leveling layer is 5 cm. The graded crushed stone leveling layer 30 can fill the potholes of the cement concrete crushed stone layer 40 and improve the flatness of the cement concrete crushed stone layer 40. In addition, the graded crushed stone leveling layer 30 can also slow down the upward reflection of the residual stress of the cement concrete crushed stone layer 40, reducing the risk of cracking of the blast furnace slag powder-fly ash large-particle crushed stone base 20.

[0086] According to the asphalt pavement structure of the blast furnace slag powder-fly ash large-particle crushed stone base 20 of the utility model, the blast furnace slag powder-fly ash large-particle crushed stone base 20 is adopted. On the one hand, the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 accounts for a high proportion, and the fine-grained aggregate is small, which reduces the risk of cracking of the base; on the other hand, since the large-particle crushed stone in the blast furnace slag powder-fly ash large-particle crushed stone base 20 is in direct contact with each other, the bearing capacity of the base is improved, thereby making the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 have both high strength and crack resistance, so that the asphalt pavement structure containing the blast furnace slag powder-fly ash large-particle crushed stone base 20 can withstand a more severe use environment, while improving the service life of the pavement.

[0087] Further, see Figure 2 The asphalt pavement structure containing the blast furnace slag powder-fly ash large-size crushed stone base 20 also includes a crushed stone seal layer 50, which is arranged between the blast furnace slag powder-fly ash large-size crushed stone base 20 and the asphalt mixture layer 10, and the thickness of the crushed stone seal layer 50 is 1-1.6 cm. The crushed stone seal layer 50 is made of crushed stone and asphalt binder, wherein the crushed stone can be a single particle size aggregate of 13.2-19 cm, and the asphalt binder can be rubber asphalt, SBS modified asphalt, etc.

[0088] On the one hand, the chip seal 50 can further reduce the stress reflected from the blast furnace slag powder-fly ash large-particle crushed stone base 20 to the asphalt mixture layer 10, thereby reducing the risk of reflection cracks in the asphalt mixture layer 10. On the other hand, the chip seal 50 can reduce the impact of water on the underlying structure and improve the durability of the pavement structure. In addition, the chip seal 50 improves the connection between the blast furnace slag powder-fly ash large-particle crushed stone base 20 and the asphalt mixture layer 10, thereby improving the overall stability of the pavement structure.

[0089] Or, in some other examples of this embodiment, see Figure 3The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base 20 also includes a stress absorption layer 60, which is arranged between the blast furnace slag powder-fly ash large-size crushed stone base 20 and the asphalt mixture layer 10. The stress absorption layer 60 is an asphalt mixture, which is composed of fine aggregate, mineral filler and high elastic polymer modified asphalt binder. After molding, it is dense, has strong bonding force and is impermeable. It has good bonding performance with the blast furnace slag powder-fly ash large-size crushed stone base 20, can deform with the deformation of the blast furnace slag powder-fly ash large-size crushed stone base 20, and has excellent self-healing ability. The maximum particle size of the aggregate used in the stress absorption layer 60 is not more than 9.5mm; the asphalt in the stress absorption layer 60 can be high-viscosity asphalt, rubber asphalt, etc.; the oil-stone ratio of the stress absorption layer 60 can be 8.5-10.5%. For example, the oil-stone ratio of the stress absorption layer 60 in this embodiment can be 9.5%.

[0090] The thickness of the stress absorbing layer 60 is 2-3 cm. For example, in this embodiment, the thickness of the stress absorbing layer 60 is 2.5 cm.

[0091] The stress absorbing layer 60 has the characteristics of high elasticity, high toughness and impermeability. These special properties enable the stress absorbing layer 60 to disperse the concentrated stress in the crack area of ​​the pavement structure to a larger area, reduce the stress peak, and play the effect of delaying the time of the appearance of reflective cracks and slowing down the expansion speed of reflective cracks. The stress absorbing layer 60 can also resist great deformation without breaking, and can isolate the road surface water from penetrating downward, and can also be well bonded to the blast furnace slag powder-fly ash large-particle crushed stone base 20, thereby increasing the fatigue life of the blast furnace slag powder-fly ash large-particle crushed stone base 20.

[0092] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0093] It should be noted that the technical solutions in various embodiments of the present utility model can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present utility model.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 utility model.

Claims

1. An asphalt pavement structure containing a blast furnace slag powder-fly ash large-size crushed stone base, It is characterized in that It includes a bottom cushion layer, a blast furnace slag powder-fly ash large-particle crushed stone base layer, a graded crushed stone leveling layer, a crushed stone sealing layer and an asphalt mixture layer. The blast furnace slag powder-fly ash large-particle crushed stone base layer is arranged on the upper side of the bottom cushion layer, the asphalt mixture layer is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base layer, and the asphalt mixture layer is suitable for direct contact with automobile tires; the bottom cushion layer is a cement concrete crushed stone layer, the graded crushed stone leveling layer is arranged between the cement concrete crushed stone layer and the blast furnace slag powder-fly ash large-particle crushed stone base layer, and the thickness of the graded crushed stone leveling layer is 4cm-8cm; the crushed stone sealing layer is arranged between the blast furnace slag powder-fly ash large-particle crushed stone base layer and the asphalt mixture layer; the thickness of the crushed stone sealing layer is 1cm-1.6cm.

2. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 1, It is characterized in that It also includes a stress absorption layer, which is arranged between the blast furnace slag powder-fly ash large-grained crushed stone base layer and the asphalt mixture layer; the thickness of the stress absorption layer is 2cm-3cm.

3. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 1, It is characterized in that It also includes a graded crushed stone cushion layer; the bottom cushion layer is a water-stable base layer, the graded crushed stone cushion layer is arranged on the lower side of the water-stable base layer, and the thickness of the graded crushed stone cushion layer is 15cm-20cm.

4. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 1, It is characterized in that The asphalt mixture layer includes an asphalt mixture upper layer and an asphalt mixture lower layer; the asphalt mixture upper layer is suitable for contacting the automobile tires, the asphalt mixture upper layer is arranged on the upper side of the asphalt mixture lower layer, and the asphalt mixture lower layer is arranged on the upper side of the blast furnace slag powder-fly ash large-particle crushed stone base layer.

5. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 4, It is characterized in that The asphalt mixture layer also includes an asphalt mixture middle surface layer, and the asphalt mixture middle surface layer is arranged between the asphalt mixture upper layer and the asphalt mixture lower layer.

6. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 5, It is characterized in that The material of the upper layer of the asphalt mixture is AC-13 asphalt mixture or SMA-13 ​​asphalt mixture; The material of the surface layer of the asphalt mixture is AC-20 asphalt mixture; The material of the lower layer of the asphalt mixture is ATB-25 asphalt mixture or AC-20 asphalt mixture.

7. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 5, It is characterized in that The thickness of the upper layer of the asphalt mixture is 3.5cm-4cm, the thickness of the middle layer of the asphalt mixture is 5cm-7cm, and the thickness of the lower layer of the asphalt mixture is 6cm-8cm.

8. The asphalt pavement structure containing blast furnace slag powder-fly ash large-size crushed stone base according to claim 1, It is characterized in that The thickness of the blast furnace slag powder-fly ash large-particle crushed stone base layer is 18cm-24cm.

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