Loading device for tension and compression test of geopolymer-foundation concrete combined test piece
By using a synchronously movable right-angle plate and a base plate for diagonal parallel positioning in the loading device, the problem of test data deviation caused by inaccurate specimen positioning was solved, achieving precise specimen positioning and efficient testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BAIYIN POWER SUPPLY COMPANY STATE GRID GANSU ELECTRIC POWER
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-21
AI Technical Summary
In the existing technology, the geopolymer-foundation concrete composite specimens have poor specimen positioning accuracy during loading, resulting in large deviations in the test data.
Two right-angled plates that can move closer or further apart simultaneously are used to ensure that they are parallel to the diagonal of the square surface of the base plate. The specimen is positioned by the right-angled plates to ensure that the specimen is centered on the base plate and to avoid eccentric pressure.
This improved the accuracy of the test results, ensured that the specimen was always centered, avoided eccentric compression, and enhanced the reliability of the test data.
Smart Images
Figure CN224152195U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of testing technology for geopolymer-foundation concrete composite specimens, specifically a loading device for tensile and compressive testing of geopolymer-foundation concrete composite specimens. Background Technology
[0002] Geopolymers are low-carbon binders formed by activating solid aluminosilicates (such as fly ash, silica fume, and metakaolin) through the use of alkaline sols (such as silicates, carbonates, alkaline hydroxides, and sulfates).
[0003] Using geopolymer mortar to repair damaged concrete is a commonly used method for concrete repair. In addition, an appropriate amount of fiber material is usually added to the geopolymer mortar to improve the compressive and tensile strength of the repaired geopolymer-foundation concrete assembly.
[0004] However, the specific amount of fiber material to be added still needs to be determined through experiments. Specifically, firstly, a geopolymer-foundation concrete composite specimen is manufactured, and then the compressive and tensile properties of the geopolymer-foundation concrete composite specimen are tested using a loading device. The optimal amount of fiber material to be added is then determined based on the test results.
[0005] During the test, the geopolymer-foundation concrete composite specimen needs to be placed in the center of the loading device base plate to ensure that the specimen is uniformly compressed in the center. If the specimen is not placed in the center of the base plate, it will be eccentrically compressed, resulting in a large deviation in the final test data. However, at present, the specimens are placed manually, which results in poor accuracy of the specimen position. Utility Model Content
[0006] The purpose of this invention is to provide a loading device for tensile and compressive testing of geopolymer-foundation concrete composite specimens, so as to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution: a loading device for tensile and compressive testing of geopolymer-foundation concrete composite specimens, comprising a testing machine body, a specimen placed on the bottom support plate of the testing machine body, and a top pressure plate placed directly above the bottom support plate, wherein the bottom support plate and the top pressure plate are both square in shape in the vertical direction;
[0008] The loading device also includes two right-angle plates and a driving component that drives the two right-angle plates to move closer or further away synchronously, wherein the direction in which the two right-angle plates move closer or further away synchronously is parallel to the diagonal of the square surface of the base plate.
[0009] The maximum distance between the two right-angled plates is greater than the diagonal length of the square surface of the top pressure plate.
[0010] Preferably, the vertical length of the right-angle plate is less than the maximum distance between the bottom support plate and the top pressure plate;
[0011] Four side observation plates are provided on the outside of the four guide columns of the testing machine body. The four side observation plates are arranged in a rectangle, and a gap is left between the top of the side observation plates and the top seat of the testing machine body.
[0012] The top of the right-angle plate is fixedly connected to a connecting rod that is perpendicular to it, and the connecting rod extends through the gap to the outside of the space enclosed by the four side observation plates.
[0013] Preferably, the bottom surface of the connecting rod is in sliding contact with the upper surface of the side observation plate.
[0014] Preferably, the driving component includes a bidirectional screw that is rotatably and fixedly connected to the top seat, and the two connecting rods are respectively threaded onto the two threads of the bidirectional screw.
[0015] Preferably, a crank handle is fixedly connected to one end of the bidirectional screw.
[0016] Preferably, the driving component further includes a fixing frame, and the middle part of the bidirectional screw is rotatably connected to the bottom end of the fixing frame.
[0017] Preferably, the drive component further includes two stabilizers, one end of which is fixedly connected to the fixed frame, and the other end is rotatably connected to the end of the bidirectional screw.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] This invention uses two right-angled plates that can move closer or further apart simultaneously, with the direction of their movement parallel to the diagonal of the square surface of the base plate. This allows for the positioning of the specimen with only two right-angled plates, ensuring that the specimen is centered on the base plate during each test. This effectively avoids eccentric compression of the specimen and improves the accuracy of the test results. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a partial top view of the structure of this utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the two right-angled plates of this utility model when the distance between them is at its maximum.
[0023] In the figure: 1. Base plate; 2. Top pressure plate; 3. Guide column; 4. Side observation plate; 5. Fixing frame; 6. Two-way screw; 7. Connecting rod; 8. Right angle plate; 9. Stabilizing frame; 10. Top seat; 11. Crank handle; 100. Specimen. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figures 1-3 This utility model provides a technical solution:
[0026] The loading device for tensile and compressive testing of geopolymer-foundation concrete composite specimens can be a cement pressure testing machine, including the testing machine body. The testing machine body is equipped with a bottom support plate 1, a top pressure plate 2, a guide column 3, a side observation plate 4, and a top seat 10. The top pressure plate 2 can move towards the bottom support plate 1 under the action of driving force, thereby testing the specimen 100 placed on the bottom support plate 1. The above are all existing technologies and will not be elaborated here.
[0027] The specimen 100 is placed on the base plate 1 of the testing machine body. The specimen 100 is the geopolymer-foundation concrete composite specimen of this utility model. The figure shows the compressive strength test of the geopolymer-foundation concrete composite specimen alone. The shape of the specimen 100 is a cube. In this scheme, the tensile strength of the specimen 100 is tested by the splitting tensile strength test method. Therefore, when it is necessary to test the tensile strength of the specimen 100, the specimen 100 needs to be placed inside the mold of the splitting test. At this time, it should be noted that the cross-sectional shape of the splitting test mold in the horizontal direction is designed as a square.
[0028] The top pressure plate 2 is positioned directly above the bottom support plate 1. Both the bottom support plate 1 and the top pressure plate 2 have square surfaces in the vertical direction. The loading device also includes two right-angle plates 8 and a driving component that drives the two right-angle plates 8 to move closer or further away simultaneously. The direction in which the two right-angle plates 8 move closer or further away simultaneously is parallel to the diagonal of the square surface of the bottom support plate 1, so that the two right-angle plates 8 can clamp and position the specimen 100 from two opposite corners, ensuring that the specimen 100 is located at the center of the bottom support plate 1. Furthermore, the maximum distance between the two right-angle plates 8 is greater than the diagonal length of the square surface of the top pressure plate 2. Thus, after the specimen 100 is positioned, adjusting the distance between the two right-angle plates 8 to the maximum can avoid the top pressure plate 2 and prevent the top pressure plate 2 from squeezing the right-angle plates 8 when it moves down.
[0029] The working principle of the above scheme is as follows: the cube specimen 100 or the splitting test mold containing the specimen 100 is manually placed on the bottom support plate 1. Then, the position of the specimen 100 can be adjusted by the two right-angle plates 8 until the specimen 100 is completely located in the center of the bottom support plate 1 and the top pressure plate 2. After that, the loading device can be started to carry out the test.
[0030] In the above scheme, by setting two right-angled plates 8 that can move closer or further away simultaneously, and making the directions in which the two right-angled plates 8 move closer or further away parallel to the diagonal of the square surface of the base plate 1, the positioning of the specimen 100 can be completed by setting only two right-angled plates 8. This ensures that the specimen 100 is located in the center of the base plate 1 during each test, effectively avoiding the occurrence of eccentric pressure on the specimen 100, improving the accuracy of the test results, and the overall structure is simple. It can achieve precise positioning of the specimen 100 without changing the existing loading device.
[0031] The vertical length of the right-angle plate 8 is less than the maximum distance between the bottom support plate 1 and the top pressure plate 2, so that the right-angle plate 8 can move smoothly between the bottom support plate 1 and the top pressure plate 2.
[0032] Four side observation plates 4 are provided on the outer side of the four guide columns 3 of the testing machine body. The four side observation plates 4 are arranged in a rectangle. There is a gap between the top of the side observation plates 4 and the top seat 10 of the testing machine body. A connecting rod 7 is fixedly connected to the top of the right angle plate 8 and is arranged perpendicular to it. The connecting rod 7 extends through the gap to the outside of the space enclosed by the four side observation plates 4. This allows the driving component to be set outside the space enclosed by the four side observation plates 4, which greatly facilitates the installation of the driving component.
[0033] Furthermore, the bottom surface of the connecting rod 7 slides in contact with the upper surface of the side observation plate 4, so that the vertical position of the connecting rod 7 can be limited by the side observation plate 4 to prevent it from tilting.
[0034] The driving component includes a bidirectional screw 6 rotatably and fixedly connected to the top seat 10. The driving component also includes a fixing frame 5. The middle part of the bidirectional screw 6 is rotatably connected to the bottom end of the fixing frame 5 (for example, the bidirectional screw 6 and the fixing frame 5 are rotatably connected via a bearing). Two connecting rods 7 are threaded onto the two threads of the bidirectional screw 6. Rotating the bidirectional screw 6 changes the distance between the two connecting rods 7, that is, adjusts the distance between the two right-angle plates 8. To facilitate the rotation of the bidirectional screw 6 by the operator, in this embodiment, a crank handle 11 is fixedly connected to one end of the bidirectional screw 6. The crank handle 11 is Z-shaped.
[0035] The drive component also includes two stabilizers 9. One end of the stabilizer 9 is fixedly connected to the fixed frame 5, and the other end is rotatably connected to the end of the bidirectional screw 6 through a bearing. The stabilizer 9 can improve the stability of the bidirectional screw 6 during rotation.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A loading device for tensile and compressive testing of geopolymer-foundation concrete composite specimens, comprising a testing machine body, a specimen placed on a base plate of the testing machine body, and a top pressure plate placed directly above the base plate, characterized in that, The surface shape of the bottom supporting plate and the top pressing plate in the vertical direction is square; The loading device further comprises two right-angle plates and a driving component for driving the two right-angle plates to move towards or away from each other in a direction parallel to the diagonal line of the square surface of the bottom supporting plate; The maximum distance between the two right-angle plates is greater than the length of the diagonal line of the square surface of the top pressing plate.
2. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 1, wherein The vertical length of the right-angle plate is less than the maximum distance between the bottom supporting plate and the top pressing plate; The outer sides of the four guide columns of the testing machine body are provided with four side observation plates, which are arranged in a rectangular shape, and a gap is left between the top of the side observation plates and the top seat of the testing machine body; The top of the right-angle plate is fixedly connected with a connecting rod arranged perpendicularly thereto, and the connecting rod extends to the outside of the space surrounded by the four side observation plates through the gap.
3. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 2, wherein The bottom surface of the connecting rod is in sliding contact with the upper surface of the side observation plate.
4. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 2, wherein The driving component comprises a bidirectional screw rod rotationally fixedly connected with the top seat, and the two connecting rods are respectively threadedly connected on the two threads of the bidirectional screw rod.
5. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 4, wherein One end of the bidirectional screw rod is fixedly connected with a crank handle.
6. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 4, wherein The driving component further comprises a fixing frame, and the middle part of the bidirectional screw rod is rotationally connected with the bottom end of the fixing frame.
7. The loading device for a geopolymer-prime concrete combined specimen tensile test according to claim 6, wherein The driving component further comprises two stabilizing frames, one end of each stabilizing frame is fixedly connected with the fixing frame, and the other end is rotationally connected with the end part of the bidirectional screw rod.