Multi-layer composite artificial stone pavement brick

Abstract

The utility model discloses a multilayer composite artificial stone pavement brick, which belongs to the technical field of building materials and road engineering and comprises a wear-resistant upper layer, a bearing middle layer connected to the bottom of the wear-resistant upper layer, and a damping lower layer connected to the bottom of the bearing middle layer. The bearing middle layer is of a solid structure; the damping lower layer is of a porous structure, and the porous structure is of a gradient pore structure, specifically, the internal pore size is large, and the external pore size is small; the density of the damping lower layer is gradually changed from inside to outside, specifically, the internal density is smaller than the external density. The pavement brick is designed into a multi-layer structure with a wear-resistant upper layer, a compression-resistant middle layer and an impact-resistant lower layer, so that the compression-resistant, wear-resistant and impact-resistant performances are realized; the fiber reinforced material is added into the artificial stone, so that the strength and the toughness are enhanced; artificial stone and polymer materials are mixed to form a porous structure, and energy absorption and buffering capacity is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building materials and road engineering, and particularly relates to a multi-layer composite artificial stone pavement brick. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Existing paving brick materials primarily include cement bricks, ceramic bricks, and natural stone. These materials suffer from poor wear resistance, cracking, and insufficient impact resistance during use. Especially in high-load and complex environments with high traffic volume and fluctuating climates, pavements paved with these traditional paving bricks are prone to damage over time, requiring frequent maintenance and replacement, increasing both manpower and financial expenditures.

[0004] Artificial stone, due to its controllable physical and chemical properties, exhibits excellent hardness, strength, and durability. Patent CN113896464B discloses a method for preparing recycled cement-based permeable paving bricks from organic artificial stone processing waste and waste rubber and plastic powder. The resulting cement-based permeable paving bricks exhibit excellent weather resistance, wear resistance, and strength.

[0005] Although the above scheme uses artificial stone to make permeable pavement bricks, the pavement bricks are made as a whole, which enhances their overall strength. However, there is no structural stratification based on the usage characteristics of the pavement bricks, and no shock-absorbing structure is designed. When the pavement bricks are impacted, they are easily damaged. Utility Model Content

[0006] In response to the above problems, the utility model provides a multi-layer composite artificial stone pavement brick, which is designed to have a multi-layer structure with a wear-resistant upper layer, a pressure-resistant middle layer, and an impact-resistant lower layer, thereby achieving excellent pressure resistance, wear resistance, and impact resistance, and significantly improving the service life and reliability of the pavement brick; the middle layer of the pressure-resistant bearing layer is enhanced in strength and toughness by adding fiber-reinforced materials during the production process of the artificial stone, thereby enhancing the overall strength and crack resistance of the structure; the lower layer of the seismic buffer layer is made of a mixture of high-toughness artificial stone and polymer material, and is designed to have a porous structure, which increases the energy absorption and buffering capacity, and prevents the brick body from being damaged when impacted.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A multi-layer composite artificial stone pavement brick comprises a wear-resistant upper layer, the bottom of the wear-resistant upper layer is connected to a load-bearing middle layer, and the bottom of the load-bearing middle layer is connected to a shock-absorbing lower layer;

[0009] The load-bearing middle layer is a solid structure; the shock-absorbing lower layer is a porous structure, and the porous structure is a gradient pore structure, specifically, the inner pore size is large and the outer pore size is small;

[0010] The density of the shock-absorbing lower layer gradually changes from the inner part to the outer part, and specifically, the inner density is smaller than the outer density.

[0011] Preferably, the internal pore size of the shock-absorbing lower layer is in the range of 0.5-3 mm, and the external pore size of the shock-absorbing lower layer is in the range of 200-500 μm.

[0012] Preferably, the overall porosity of the shock-absorbing lower layer is in the range of 20%-50%.

[0013] Preferably, the internal density of the shock-absorbing lower layer is in the range of 1.5-1.7 g / cm 3 , the external density range is 1.7-1.9g / cm 3 .

[0014] Preferably, the wear-resistant upper layer, the wear-resistant upper layer, the load-bearing middle layer, and the shock-absorbing lower layer are connected by using an interlayer adhesive.

[0015] Preferably, the wear-resistant upper layer is made of polyurethane or epoxy resin material.

[0016] Preferably, the load-bearing middle layer is made of artificial stone material added with carbon fiber or glass fiber.

[0017] Preferably, the shock-absorbing lower layer is a polyurethane-artificial stone mixed material.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are:

[0019] The utility model designs the pavement bricks into a multi-layer structure with a wear-resistant upper layer, a pressure-resistant middle layer, and an impact-resistant lower layer, thereby achieving excellent pressure resistance, wear resistance, and impact resistance, and significantly improving the service life and reliability of the pavement bricks; the middle layer of the pressure-resistant bearing layer enhances its strength and toughness by adding fiber reinforcement materials during the production process of artificial stone, thereby enhancing the overall strength and crack resistance of the structure; the lower layer of the seismic buffer layer adopts a mixture of high-toughness artificial stone and polymer material, and is designed into a porous structure to increase energy absorption and buffering capacity, thereby preventing the brick body from being damaged when impacted. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0022] In the picture:

[0023] 1. Wear-resistant upper layer; 2. Load-bearing middle layer; 3. Shock-absorbing lower layer. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] The present invention is described in detail below with reference to the accompanying drawings. The embodiment disclosed herein is a multi-layer composite artificial stone pavement brick. Figure 1 As shown, it includes a wear-resistant upper layer 1, the bottom of the wear-resistant upper layer 1 is connected to the load-bearing middle layer 2, and the bottom of the load-bearing middle layer 2 is connected to the shock-absorbing lower layer 3.

[0026] The wear-resistant upper layer 1 is a high-hardness, wear-resistant coating. In this embodiment, it is made using high-performance polymer materials such as polyurethane or epoxy resin, as well as existing nano-coating technology, to enhance the scratch and stain resistance of the surface of the wear-resistant upper layer 1, thereby providing high wear resistance. It is understood that the wear-resistant upper layer 1 can be made into different colors and textures according to actual needs to enhance its aesthetics.

[0027] The load-bearing middle layer 2 is the main load-bearing layer and is a solid structure made of high-strength and high-toughness artificial stone material. Specifically, it uses resin and glass fiber reinforced composite material (CFRP) as the base binder, and is mixed by adding a high-strength mineral filler obtained by configuring 70% quartz sand, 15% basalt fiber, 10% granite powder, and 5% limestone powder. A catalyst, a curing agent, and a pigment are then added. The material is processed through steps such as mixing, curing, molding, demolding, drying, and surface polishing. In this embodiment, a reinforcing fiber material is added to the base binder during the above-mentioned production process. The reinforcing fiber material is glass fiber. By embedding 35% by weight of multi-directional cross-glass fibers in the load-bearing layer, the overall strength and crack resistance of the load-bearing layer are enhanced, so that the load-bearing layer is not easily damaged when it is subjected to the load pressure transmitted from the wear-resistant upper layer, and has a strong compressive resistance.

[0028] The shock-absorbing lower layer 3 is an impact-resistant, shock-absorbing layer with a porous structure. It is made by mixing high-strength, high-toughness artificial stone material produced in the same manner as above with a polymer material. This microporous structure is designed to increase energy absorption and cushioning capacity, preventing the pavement brick from breaking when subjected to stress. Specifically, the prepared high-strength, high-toughness artificial stone is crushed into tiny particles. A polymer material is used as a base binder, and a foaming agent is added to the polymer material. The crushed artificial stone particles are then added and uniformly mixed with the polymer material. During the curing process, a uniformly distributed foam structure is formed, resulting in a porous structure. In this embodiment, the polymer material is polyurethane.

[0029] Specifically, the internal pore size of the shock-absorbing lower layer was designed using finite element analysis (FEA), and a gradient pore structure was designed, with density gradually changing from the inside to the outside. In this embodiment, the simulations revealed a recommended pore size range of 200μm to 3mm. Smaller pore sizes help improve the overall strength of the material, while larger pore sizes aid in energy absorption and cushioning.

[0030] In this embodiment, by changing the amount of foaming agent used inside and outside, the pore sizes generated inside and outside the shock-absorbing lower layer are different. Specifically, the pore size in the internal area is larger, and a foaming agent with a mass ratio of 1% is used to make the pore size range from 0.5 to 3 mm. The pore size in the external area gradually decreases, and a foaming agent with a mass ratio of 0.2% is used to make the pore size range from 200 to 500 μm.

[0031] In this embodiment, by using artificial stones of different particle sizes inside and outside, the overall density of the shock-absorbing lower layer 3 gradually increases from the inside to the outside. Specifically, by selecting artificial stones with a particle size range of 2-3 mm, the inner part of the shock-absorbing lower layer has a lower density, ranging from 1.5-1.7 g / cm 3 By selecting artificial stone with a particle size range of 80-500μm, the outer layer of the shock-absorbing lower layer has a higher density in the range of 1.7-1.9g / cm 3 .

[0032] By gradually increasing the density inside and outside, combined with the designed pore size decreasing from the inside out, the shock-absorbing lower layer can absorb energy layer by layer when subjected to load impact from the upper layer, improving the cushioning effect and providing high impact resistance. This embodiment also designs the overall porosity of the shock-absorbing lower layer, with a recommended overall porosity range of 20%-50% to balance the overall material strength and energy absorption performance of the shock-absorbing layer.

[0033] In this embodiment, an interlayer adhesive is also used. A polyurethane-based adhesive is used as the interlayer adhesive to connect the wear-resistant upper layer 1, the load-bearing middle layer 2, and the shock-absorbing lower layer 3.

[0034] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A multi-layer composite artificial stone paving brick, characterized in that: It comprises a wear-resistant upper layer, the bottom of the wear-resistant upper layer is connected to the load-bearing middle layer, and the bottom of the load-bearing middle layer is connected to the shock-absorbing lower layer; The load-bearing middle layer is a solid structure; the shock-absorbing lower layer is a porous structure, and the porous structure is a gradient pore structure, specifically, the inner pore size is large and the outer pore size is small; The density of the shock-absorbing lower layer gradually changes from the inner part to the outer part, and specifically, the inner density is smaller than the outer density.

2. A multi-layer composite artificial stone pavement brick according to claim 1, characterized in that: The internal pore size of the shock-absorbing lower layer is in the range of 0.5-3 mm, and the external pore size of the shock-absorbing lower layer is in the range of 200-500 μm.

3. The multi-layer composite artificial stone paving brick according to claim 1, characterized in that: The overall porosity of the shock-absorbing lower layer ranges from 20% to 50%.

4. The multi-layer composite artificial stone pavement brick according to claim 1, characterized in that: The internal density of the shock-absorbing lower layer is in the range of 1.5-1.7 g / cm 3 , the external density range is 1.7-1.9g / cm 3 .

5. The multi-layer composite artificial stone pavement brick according to claim 1, characterized in that: The wear-resistant upper layer, the wear-resistant upper layer, the load-bearing middle layer and the shock-absorbing lower layer are connected by using an interlayer adhesive.

6. The multi-layer composite artificial stone paving brick according to claim 1, characterized in that: The wear-resistant upper layer is made of polyurethane or epoxy resin material.

7. The multi-layer composite artificial stone pavement brick according to claim 1, characterized in that: The load-bearing middle layer is made of artificial stone material added with carbon fiber or glass fiber.

8. The multi-layer composite artificial stone pavement brick according to claim 1, characterized in that: The shock-absorbing lower layer is a polyurethane-artificial stone mixed material.

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