An asphalt mixture slab test specimen density testing device

Abstract

The utility model relates to engineering test technical field, concretely is a kind of asphalt mixture slab test piece density testing device, including water injection tank, the front and back side wall of water injection tank is equipped with observation port, and observation port is provided with transparent plate;The outer surface of front side transparent plate is equipped with outside scale rule;The inside of rear side transparent plate is equipped with the inside water level ruler of vertical extension;Inside water level ruler is equipped with vertical sliding rail side, and the sliding block of vertical sliding is configured on sliding rail;Sliding block is connected with the suspension piece that can float on water surface, and suspension piece one end is equipped with the pointer of inside water level ruler direction.This utility model's beneficial effect lies in by the transparent plate (observation port) of being set up in front and back, allow direct observation water level change, avoid the cumbersome operation of traditional overflow collection;It is simultaneously provided with double scale rule of inside and outside to provide double reference, reduce visual error, and suspension piece is driven pointer along with water level rise and fall, directly indicate water level height on inside water level ruler, greatly simplify reading process and reduce artificial error.

Description

Technical Field

[0001] This utility model relates to the field of engineering testing technology, specifically to a density testing device for asphalt mixture slab specimens. Background Technology

[0002] Asphalt mixtures are composite materials, mainly composed of asphalt, coarse aggregate, fine aggregate, and mineral powder. Some also include polymers and wood cellulose. These materials, in varying quantities and qualities, form different structures and possess different mechanical properties. The density of an asphalt mixture can be used to calculate its porosity, making it a crucial indicator for mix design and on-site construction quality control. It is also widely used to evaluate the structural performance of asphalt pavements and predict their service life.

[0003] When testing asphalt mixtures, the asphalt mixture is usually first prepared into "asphalt mixture slab specimens," which are plate-shaped test samples designed to simulate the structural characteristics of actual asphalt pavements, providing an engineering carrier for testing properties such as density, strength, and durability. Then, the mass and volume of the asphalt mixture slab specimens are obtained by weighing and displacement methods. However, in the current technology, when measuring the volume of asphalt mixtures, the plate-shaped test specimen is directly placed in a cylinder filled with water, and then the volume of water displaced by the plate-shaped test specimen (i.e., overflowing the cylinder) is collected and measured to indirectly obtain the volume of the plate-shaped test specimen. Then, its density and other parameters are calculated in combination with the mass of the plate-shaped test specimen.

[0004] However, this measurement method has significant drawbacks: the operation process is cumbersome, involving multiple steps such as filling the cylinder with water, immersing the specimen, collecting overflow water, and measuring the volume, which is inefficient and prone to introducing operational errors; in addition, this test method can usually only measure the surface dry bulk density of plate-shaped test specimens, which cannot meet the test data requirements. Utility Model Content

[0005] Therefore, in view of the above problems, this utility model proposes a device for testing the density of asphalt mixture slab specimens that is easy to operate and can intuitively obtain the density of slab specimens.

[0006] This utility model is achieved through the following technical solution.

[0007] A density testing device for asphalt mixture slab specimens includes a water injection tank.

[0008] The water injection tank is provided with observation ports on both the front and rear side walls, and a transparent plate is provided on the observation ports;

[0009] The outer surface of the transparent plate on the front side is provided with an outer scale.

[0010] A vertically extending inner water level gauge is provided on the inner side of the transparent plate on the rear side;

[0011] A vertical slide rail is provided next to the inner water level gauge, and a slider that can slide vertically is configured on the slide rail;

[0012] The slider is connected to a suspending element that can float on the water surface, and one end of the suspending element is provided with a pointer that points to the inner water level gauge.

[0013] As a further improvement of this utility model, an installation groove is provided in the middle area of ​​both sides of the top of the water injection tank, and a connecting frame is provided in each installation groove. A support plate is horizontally connected between the two connecting frames, and the support plate is used to support the plate specimen.

[0014] As a further improvement of this utility model, the support surface of the support plate is a concave arc-shaped surface, and a through drainage hole is opened in the central area of ​​the arc-shaped surface.

[0015] As a further improvement of this utility model, a lifting plate is provided at the upper end of the connecting frame.

[0016] As a further improvement of this utility model: the bottom of the water tank is provided with a drain pipe that connects to the inside of the water tank, and a solenoid valve is provided on the drain pipe, the solenoid valve being configured to control the connection of the drain pipe.

[0017] As a further improvement of this utility model, support plates are fixedly connected to both sides of the bottom of the water tank, and a water collection box is provided between the two support plates. The water collection box is used to collect the water discharged from the drain pipe.

[0018] As a further improvement of this utility model, the support plate is provided with a horizontal insertion groove, and the two side boxes of the water collection box have insertion plates, which can be inserted horizontally into the insertion plates.

[0019] As a further improvement of this utility model, a third scale is provided on one side of the water collection box.

[0020] As a further improvement of this utility model, a cover plate is hinged to the upper side of the water tank.

[0021] As a further improvement of this utility model, handles are provided on both sides of the water tank.

[0022] The beneficial effects of this utility model are as follows: The transparent plates (observation ports) set at the front and rear of this utility model allow direct observation of water level changes, avoiding the cumbersome operation of traditional overflow collection; at the same time, it is equipped with inner and outer scales (outer scale + inner water level scale, in this embodiment, the corresponding water level height can be marked on one scale and the corresponding water volume can be marked on the other scale) to provide dual reference and reduce visual errors. The suspended part moves the pointer with the rise and fall of the water level, directly indicating the water level height on the inner water level scale, which greatly simplifies the reading process and reduces human error. Attached Figure Description

[0023] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0025] Figure 2 This is a side view of an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of an embodiment of this utility model;

[0027] Figure 4 This corresponds to the embodiments of this utility model. Figure 3 Enlarged view of a portion of point A in the middle;

[0028] Figure 5 This is a partial structural schematic diagram of an embodiment of this utility model.

[0029] The following are labeled in the diagram: 1. Water tank; 2. Transparent plate; 3. Outer scale; 4. Inner water level gauge; 5. Vertical slide rail; 6. Suspension component; 7. Pointer; 8. Connecting frame; 9. Support plate; 10. Drain hole; 11. Lifting plate; 12. Drain pipe; 13. Solenoid valve; 14. Support plate; 15. Water collection box; 16. Insertion slot; 17. Insert plate; 18. Third scale; 19. Cover plate; 20. Handle. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0032] refer to Figures 1 to 5 The present utility model embodiment discloses that:

[0033] A density testing device for asphalt mixture slab specimens includes a weighing device (not shown in the figure), such as an electronic scale, used to weigh the asphalt mixture slab specimens; it also includes a water tank 1, with observation ports on both the front and rear side walls of the water tank 1, and a transparent plate 2, made of acrylic, mounted on each observation port; an outer scale 3 is provided on the outer surface of the front transparent plate 2; a vertically extending inner water level gauge 4 is provided on the inner side of the rear transparent plate 2; a vertical slide rail 5 is provided next to the inner water level gauge 4, and a vertically sliding slider is mounted on the vertical slide rail 5; the slider is connected to a suspension that can float on the water surface. The float 6 has a pointer 7 at one end pointing to the inner water level gauge 4. The transparent plates 2 (observation ports) set at the front and rear allow direct observation of water level changes, avoiding the cumbersome operation of traditional overflow collection. At the same time, it is equipped with inner and outer scales (outer scale 3 + inner water level gauge 4. In this embodiment, the corresponding water level height can be marked on one scale and the corresponding water volume can be marked on the other scale) to provide dual reference and reduce visual errors. The float 6 moves the pointer 7 with the rise and fall of the water level, directly indicating the water level height on the inner water level gauge 4, which greatly simplifies the reading process and reduces human error.

[0034] An installation slot is provided in the middle area of ​​each side of the top of the water injection tank 1. A connecting frame 8 is provided in each installation slot. A support plate 9 is horizontally connected between the two connecting frames 8. The support plate 9 is used to support the plate specimen. The support plate 9 is fixed inside the water injection tank 1 through the installation slot to ensure that the plate specimen is always submerged in the central area of ​​the water injection tank 1 and to avoid volume measurement deviation caused by displacement.

[0035] The support plate 9 has a concave arc-shaped surface for supporting the specimen, and a through drainage hole 10 is opened in the central area of ​​the arc-shaped surface. The connecting frame 8 can slide vertically out of the mounting groove, so that the plate specimen can be easily removed after measurement without the need for manual handling of the water-soaked plate specimen. When the plate specimen is removed, the water in the support plate 9 is discharged along the arc-shaped surface to the drainage hole 10.

[0036] The upper end of the connecting frame 8 is provided with a lifting plate 11 to facilitate manual retrieval of the plate specimen.

[0037] The bottom of the water tank 1 is provided with a drain pipe 12 that connects to the inside of the water tank 1. A solenoid valve 13 is provided on the drain pipe 12. The solenoid valve 13 is configured to control the connection of the drain pipe 12. The solenoid valve 13 controls the drain pipe 12 to achieve one-button drainage, replacing the traditional manual water pouring and significantly improving efficiency.

[0038] Support plates 14 are fixedly connected to both sides of the bottom of the water tank 1. A water collection box 15 is provided between the two support plates 14. The water collection box 15 is used to collect the water discharged from the drain pipe. The water collection box 15 directly collects the drainage, eliminating the need for an additional water container and facilitating subsequent centralized treatment.

[0039] The support plate 14 has a horizontal insertion slot 16, and the water collection box 15 has two side boxes with insert plates 17. The insert plates 17 can be inserted horizontally into the insert plates 17. The insert plates 17 and the insertion slot 16 enable the water collection box 15 to be quickly disassembled and assembled, which is convenient for emptying or cleaning and improves the equipment maintenance efficiency.

[0040] A third scale 18 is provided on one side of the water collection box 15. Specifically, a transparent plate 2 is also provided on the front side of the water collection box 15. The third scale 18 is set on the transparent plate 2, so that the water collection box 15 also functions as a measuring cylinder, which can directly read the drainage volume, eliminating the step of transferring water to other measuring tools and reducing the source of error.

[0041] The water tank 1 is hinged to a cover plate 19 on its upper side; the cover plate 19 reduces the drop in water level caused by water evaporation, ensuring the accuracy of long-term testing; and at the same time prevents dust from falling in.

[0042] The water tank 1 is provided with handles 20 on both sides to facilitate the movement of the water tank 1 by staff.

[0043] Working principle: During operation, a fixed amount of water is injected into the water tank 1. At this time, the suspension component 6 rises synchronously with the water level. The suspension component 6 drives the pointer 7 and the slider to slide precisely along the vertical slide rail within the limit frame, ensuring no deviation or shaking during the rising process. The pointer 7, in conjunction with the displacement scale on the inner water level gauge 4, can record the water volume in real time. At this time, the initial water volume (V1) is recorded. Then, the net weight (m1) of the plate specimen is weighed by the weighing device, and the plate specimen is placed into the water tank 1. At this time, the water level in the water tank 1 rises, and the suspension component 6 rises synchronously with the water level. 6. Observe and record the water volume (V2). Subtract the two sets of data to obtain the surface dry volume of the plate specimen. Then, calculate the surface dry volume density of the plate specimen using Archimedes' principle. After that, let it stand for a certain period of time, and the water seeps into the pores of the plate specimen. At this time, the water level in the water tank 1 drops, and observe and record the water volume (V3). Analyze the data (V1, V3) to obtain the gross volume of the plate specimen. Then, calculate the surface dry volume density of the plate specimen using Archimedes' principle.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A density testing device for asphalt mixture slab specimens, comprising a water injection tank (1), characterized in that: The front and rear side walls of the water tank (1) are provided with observation ports, and a transparent plate (2) is provided on the observation ports. The outer surface of the transparent plate (2) on the front side is provided with an outer scale (3); The inner side of the transparent plate (2) on the rear side is provided with a vertically extending inner water level gauge (4). A vertical slide rail (5) is provided next to the inner water level gauge (4), and a slider that can slide vertically is provided on the vertical slide rail (5); The slider is connected to a suspending element (6) that can float on the water surface, and one end of the suspending element (6) is provided with a pointer (7) pointing to the inner water level gauge (4).

2. The density testing device for asphalt mixture slab specimens according to claim 1, characterized in that: The water injection tank (1) has an installation slot in the middle area on both sides of the top. Each installation slot is equipped with a connecting frame (8). A support plate (9) is horizontally connected between the two connecting frames (8). The support plate (9) is used to support the plate specimen.

3. The density testing device for asphalt mixture slab specimens according to claim 2, characterized in that: The support plate (9) has a concave arc-shaped surface on the specimen support surface, and a through drainage hole (10) is opened in the central area of ​​the arc-shaped surface.

4. The density testing device for asphalt mixture slab specimens according to claim 3, characterized in that: The upper end of the connecting frame (8) is provided with a lifting plate (11).

5. The density testing device for asphalt mixture slab specimens according to claim 1, characterized in that: The bottom of the water tank (1) is provided with a drain pipe (12) that connects to the inside of the water tank (1). A solenoid valve (13) is provided on the drain pipe (12), and the solenoid valve (13) is configured to control the connection of the drain pipe (12).

6. The density testing device for asphalt mixture slab specimens according to claim 5, characterized in that: The bottom of the water tank (1) is fixedly connected to two support plates (14) on both sides, and a water collection box (15) is provided between the two support plates (14). The water collection box (15) is used to collect the water discharged from the drain pipe.

7. The density testing device for asphalt mixture slab specimens according to claim 6, characterized in that: The support plate (14) has a horizontal insertion groove (16), and the water collection box (15) has insertion plates (17) on both sides. The insertion plates (17) can be inserted horizontally into the insertion plates (17).

8. The density testing device for asphalt mixture slab specimens according to claim 7, characterized in that: A third scale (18) is provided on one side of the water collection box (15).

9. The density testing device for asphalt mixture slab specimens according to claim 1, characterized in that: The water tank (1) is hinged to a cover plate (19) on the upper side.

10. The density testing device for asphalt mixture slab specimens according to claim 2, characterized in that: The water tank (1) is provided with handles (20) on both sides.

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