A semi-flexible pavement material test specimen manufacturing device

Abstract

The utility model provides a kind of semi-flexible pavement material test piece production device, belong to pavement material technical field, including cylinder mould, clamp, chassis, pressurizing mould top cover and base test piece, the circumference outside of base test piece is sleeved in the cylinder mould, the bottom end of cylinder mould is arranged on chassis, the circumference outside of cylinder mould is sleeved in clamp, cylinder mould and base test piece are fastened together, the top of cylinder mould is provided with pressurizing mould top cover.In the utility model, by using thin steel sheet as mould basic material, cylinder mould opening design is used on mould form, so that novel mould can be reused, the test piece surface obtained after grouting is smooth, the height of top surface grouting is controllable using scale mark on cylinder mould, the size of test piece after grouting is formed is regular, mould material is easy to obtain, and assembly is convenient and simple.

Description

Technical Field

[0001] This utility model relates to the field of road surface materials technology, and in particular to a device for fabricating semi-flexible road surface material specimens. Background Technology

[0002] Currently, existing highway and urban road pavements are basically divided into two categories: asphalt concrete pavement and cement concrete pavement. Asphalt concrete pavement has advantages such as seamless construction, good surface smoothness, high flexibility, and a smooth and comfortable ride. Furthermore, its construction is highly mechanized, fast, of high quality, and easy to maintain. Therefore, asphalt concrete pavement has been widely promoted and applied in highway construction. However, due to the viscoelastic and plastic properties of asphalt materials, the strength and rheological properties of the asphalt pavement structural layer are greatly affected by temperature changes. In the high temperatures of summer, the decrease in the viscosity of the asphalt material weakens the cohesion between aggregate particles. Under horizontal forces, this easily leads to sliding and displacement between asphalt mixture particles, causing shear deformation damage such as rutting, shoving, wave-like structures, and shoving in the asphalt pavement structural layer, reducing driving comfort.

[0003] Cement concrete pavement materials have the characteristics of strong resistance to deformation, long service life and low daily maintenance costs. However, this pavement structure has problems such as poor driving comfort and difficulty in repairing pavement structure after damage occurs.

[0004] Combining the advantages of asphalt concrete pavement and cement concrete pavement, semi-flexible pavement materials have emerged, representing a new type of pavement material that combines rigidity and flexibility. It refers to a pavement formed by injecting a special grout, primarily composed of cement, into a compacted asphalt mixture (with a porosity as high as 20%–30%). Compared to asphalt mixtures, semi-flexible pavements improve rutting resistance, low-temperature crack resistance, and durability. Furthermore, compared to cement concrete, semi-flexible materials lower the modulus, improve crack resistance, and also enhance driving comfort and durability. In addition, semi-flexible pavement materials possess properties such as oil resistance, acid resistance, heat resistance, water resistance, skid resistance, and ease of coloring.

[0005] In the design, construction, and quality acceptance of semi-flexible pavement materials, it is necessary to test various technical indicators of the materials and prepare semi-flexible pavement material specimens in the laboratory. Current specimen preparation methods often involve surrounding the specimen with plastic wrap to prevent grout leakage during the grouting process, and then securing the plastic wrap with transparent tape. While this method is convenient in terms of material availability, it is cumbersome to operate, and wrinkles may appear on the surface of the plastic wrap during wrapping, resulting in wrinkled textures on the surface of the specimen after grouting, affecting the final molding effect. Furthermore, the grouting height on the top surface is uncontrollable, and this mold cannot be reused. Summary of the Invention

[0006] To overcome the above problems, this utility model provides a semi-flexible pavement material specimen preparation device. By selecting an asphalt mixture matrix that meets the porosity requirements and by selecting the grouting mold material and designing the mold form, the new mold can be reused, resulting in a smooth surface of the specimen after grouting, controllable grouting height on the top surface, and regular specimen size after grouting and molding.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A semi-flexible pavement material specimen preparation device includes a cylindrical mold, a clamp, a chassis, a pressure mold top cover, and a substrate specimen. The cylindrical mold is fitted around the outer circumference of the substrate specimen, and the bottom end of the cylindrical mold is set on the chassis. The clamp is fitted around the outer circumference of the cylindrical mold, and the pressure mold top cover is set on the top of the cylindrical mold. A pressure cylinder is connected to the pressure mold top cover. The substrate specimen is a cylinder made of asphalt mixture with a porosity of 20%-30%.

[0008] Furthermore, an air inlet is provided in the middle of the top cover of the pressurizing mold, and a rubber tube is connected to the air inlet, with one end of the rubber tube connected to the pressurizing air cylinder.

[0009] Furthermore, the top cover of the pressure mold is tightly fitted to the cylindrical mold, and the top cover of the pressure mold is made of rubber.

[0010] Furthermore, the cylindrical mold is configured as an open cylindrical structure, and the side wall of the cylindrical mold is provided with graduations. Furthermore, several clamps are provided, and the clamps and the cylindrical mold are configured as a detachable device. Furthermore, the chassis is configured as a cylindrical structure with an open top and a closed bottom, and the chassis and the cylindrical mold are configured as detachable devices. This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: In this utility model, thin steel plate is used as the basic material of the mold, and the mold adopts a cylindrical mold opening design, which makes the new mold reusable. The surface of the specimen obtained after grouting is flat. The grouting height of the top surface can be controlled by the scale marks on the cylindrical mold. The specimen after grouting and molding has regular size. The mold material is easy to obtain and the assembly is convenient and simple. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the specimen fabrication device of this utility model; Figure 2 This is a partial structural schematic diagram of the specimen fabrication device of this utility model; Figure 3This is a schematic diagram of the structure of the pressure mold top cover of this utility model; Figure 4 This is a structural schematic diagram of the cylindrical mold of this utility model; Figure 5 This is a top view of the chassis of this utility model; Figure 6 This is a front view of the chassis of this utility model.

[0012] In the attached diagram, 1-cylindrical mold, 2-clamp, 3-base platen, 4-top cover of pressure mold, 41-inflation hole, 42-rubber tube, 5-substrate specimen, and 6-pressure cylinder. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of this utility model, and these aspects can be achieved even without these specific details.

[0014] like Figure 1-2 As shown, a semi-flexible pavement material specimen fabrication device includes a cylindrical mold 1, a clamp 2, a base plate 3, a pressure mold top cover 4, and a substrate specimen 5. The cylindrical mold 1 is fitted around the outer circumference of the substrate specimen 5, with its bottom end positioned on the base plate 3. The clamp 2 is fitted around the outer circumference of the cylindrical mold 1, securing the cylindrical mold 1 and the substrate specimen 5 together. The pressure mold top cover 4 is positioned on top of the cylindrical mold 1, and a pressure cylinder 6 is connected to the top cover 4. The substrate specimen 5 is a cylinder made of asphalt mixture with a porosity of 20%-30%. The bottom end of the cylindrical mold 1 is tightly secured by the base plate 3, and the portion above the bottom end of the cylindrical mold 1 is secured by the clamp 2, ensuring that the cylindrical mold 1 and the substrate specimen 5 are firmly attached without affecting the molding effect after grouting. The mold material of this invention is readily available, assembly is convenient and simple, and the device is reusable.

[0015] like Figure 3 As shown, an air inlet 41 is provided in the middle of the top cover 4 of the pressure mold. A rubber tube 42 is connected to the air inlet 41, and one end of the rubber tube 42 is connected to the pressure cylinder 6. One end of the rubber tube 42 extends through the air inlet 44 into the interior of the top cover 4 of the pressure mold, and the other end of the rubber tube 42 is connected to the air hole of the pressure cylinder 6. When using pressure-assisted grouting, air is pumped into the cylindrical mold 1 through the pressure cylinder 6 and the rubber tube 42 to pressurize the interior of the cylindrical mold 1. The pressure forces the grout into the voids of the substrate specimen 5 until all the grout flows into the interior of the substrate specimen 5 and fills the voids.

[0016] like Figure 4 As shown, the cylindrical mold 1 is formed by bending a rectangular steel plate into an open cylinder. Height markings are provided on the side wall of the cylindrical mold 1. The cylindrical mold 1 is formed by bending a rectangular steel plate, but the two ends of the rectangular steel plate are not connected during bending, making it a cylindrical structure with openings at both ends and one side. This also facilitates the use of substrate specimens 5 of different diameters. When the cylindrical mold 1 is fitted onto the outside of the substrate specimen 5, the two ends of the opening on one side of the cylindrical mold 1 are overlapped to ensure that the cylindrical mold 1 is securely fastened to the outer circumference of the substrate specimen 5. Several clamps 2 are provided, and the clamps 2 and the cylindrical mold 1 are configured as detachable devices, which facilitates later maintenance and management, and can be disassembled and reused.

[0017] like Figure 5-6 As shown, the chassis 3 is configured as a cylindrical structure with an open top and a sealed bottom, and the chassis 3 and the cylindrical mold 1 are configured as a detachable device. The chassis 3 being configured as a cylindrical structure with an open top and a sealed bottom can fix and seal the bottom end of the cylindrical mold 1, further strengthening the bond strength between the cylindrical mold 1 and the substrate specimen 5.

[0018] Working principle Remove the top cover 4 of the pressure mold, and place the cylindrical mold 1 on the outside of the substrate specimen 5, so that the steel plates on both sides of the opening of the cylindrical mold 1 overlap, thereby wrapping the substrate specimen 5 inside the cylindrical mold 1; place the clamp 2 on the outside of the cylindrical mold 1 and tighten the clamp 2 to make the cylindrical mold 1 fit with the substrate specimen 5, and then put the cylindrical mold 1 into the base plate 3; grout the substrate specimen 5, and install the top cover 4 of the pressure mold on the cylindrical mold 1 to apply pressure. Since the top cover 4 of the pressure mold is made of rubber and is telescopic, it can fit tightly with the cylindrical mold 1 to form a pressurized environment until all the grout flows into the internal gaps of the substrate specimen 5 and fills the gaps.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for fabricating semi-flexible pavement material specimens, characterized in that: The test specimen includes a cylindrical mold (1), a clamp (2), a base plate (3), a pressure mold top cover (4), and a substrate specimen (5). The cylindrical mold (1) is fitted on the outer circumference of the substrate specimen (5). The bottom end of the cylindrical mold (1) is set on the base plate (3). The clamp (2) is fitted on the outer circumference of the cylindrical mold (1). The pressure mold top cover (4) is set on the top of the cylindrical mold (1). A pressure cylinder (6) is connected to the pressure mold top cover (4). The substrate specimen (5) is a cylinder made of asphalt mixture with a porosity of 20%-30%.

2. The apparatus for fabricating semi-flexible pavement material specimens according to claim 1, characterized in that: An air inlet (41) is provided in the middle of the top cover (4) of the pressurizing mold. A rubber tube (42) is connected to the air inlet (41), and one end of the rubber tube (42) is connected to the pressurizing air cylinder (6).

3. The apparatus for fabricating semi-flexible pavement material specimens according to claim 1, characterized in that: The pressure mold top cover (4) is tightly fitted to the cylindrical mold (1), and the pressure mold top cover (4) is made of rubber.

4. The apparatus for fabricating semi-flexible pavement material specimens according to claim 1, characterized in that: The cylindrical mold (1) is configured as an open cylindrical structure, and the side wall of the cylindrical mold (1) is provided with a scale.

5. The apparatus for fabricating semi-flexible pavement material specimens according to claim 1, characterized in that: The clamps (2) are provided in several units, and the clamps (2) and the cylindrical mold (1) are configured as detachable devices.

6. The apparatus for fabricating semi-flexible pavement material specimens according to claim 1, characterized in that: The chassis (3) is configured as a cylindrical structure with an open top and a closed bottom, and the chassis (3) and the cylindrical mold (1) are configured as detachable devices.

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