Creep and corrosion testing device for reinforced concrete member
By designing a test device including sliding columns, hydraulic cylinders and corrosion devices, the problem that the prior art cannot test ultra-high performance concrete creep performance in corrosive states is solved, and the concrete specimens are realized under corrosion conditions Variation deformation test improves the accuracy of performance evaluation.
Patent Information
- Application Number
- CN202411472056.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-01-10
AI Technical Summary
Existing creators cannot effectively test the creep performance of ultra-high performance concrete in corrosive states, especially considering the impact of corrosion of steel fibers on performance in ultra-high performance concrete.
A reinforced concrete component creep and corrosion test device is designed, including a lower pressure plate, a sliding column, an upper pressure plate, a driving device, a concrete sample and a corrosion device, and the compression or stretching of the concrete sample is achieved through hydraulic cylinders and sliding columns. creep and corrosion tests are carried out simultaneously with the corrosion box made of non-conductive and transparent material and the vibrating strain sensor.
Crooked deformation tests during the slow corrosion process of concrete specimens under constant load are realized, and the understanding and evaluation ability of ultra-high performance concrete performance is improved.
Smart Images
Figure CN119290605A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of concrete testing, in particular to a creep and corrosion testing device for reinforced concrete components. Background Art
[0002] Ultra-high performance concrete is an ultra-high performance fiber-reinforced cement-based composite material with high compressive strength, high tensile strength, high modulus, high ductility and high durability. It is composed of cement, mineral admixtures, quartz sand, quartz powder, steel fiber, water reducer and water according to the maximum density theory, which reduces the defects inside the material to a minimum. It is a new type of high-quality cement-based material.
[0003] Creep, as the long-term deformation performance of concrete, has a profound impact on engineering structures. Concrete creep refers to the phenomenon that the strain of materials increases with the passage of time under long-term continuous loads. It has a great impact on the long-term service life of concrete structures. It may cause failure problems such as cracks, deflection, and prestress loss.
[0004] The creep tester can test the deformation of a rectangular or cylindrical concrete specimen under a constant compressive load over time, that is, the compressive creep deformation of the concrete. However, the creep tester can only simulate the compressive creep deformation of concrete specimens under normal conditions, and cannot perform a good test on special cases, such as concrete specimens under corrosion. Ultra-high performance concrete contains a large amount of steel fibers. When testing the performance of ultra-high performance concrete, it is necessary to consider the impact of steel fiber corrosion on the performance of ultra-high performance concrete.
[0005] Therefore, there is an urgent need for a test device that can corrode ultra-high performance concrete and perform creep tests on it at the same time. Summary of the invention
[0006] The main purpose of the present invention is to provide a creep and corrosion test device for reinforced concrete components to solve the above problems.
[0007] To achieve the above-mentioned object, the present invention provides a creep and corrosion test device for reinforced concrete components, comprising:
[0008] Lower pressure plate;
[0009] A first sliding column, arranged on the lower pressing plate;
[0010] An upper pressing plate, slidably connected to the first sliding column;
[0011] A driving device, used for driving the upper pressing plate to move closer to or away from the lower pressing plate along the first sliding column;
[0012] A concrete sample is disposed between the lower pressing plate and the upper pressing plate and is detachably connected to the lower pressing plate and the upper pressing plate;
[0013] The corrosion device is arranged on the concrete sample and is used for corroding the concrete sample.
[0014] Furthermore, the driving device includes a fixed plate and a hydraulic cylinder, the fixed plate is arranged at one end of the first sliding column away from the lower pressure plate, the hydraulic cylinder is arranged on the fixed plate, the driving end of the hydraulic cylinder is close to the upper pressure plate, and the hydraulic cylinder is used to drive the upper pressure plate close to the lower pressure plate.
[0015] Further, the driving device includes a fixed plate and a hydraulic cylinder, the fixed plate is arranged at one end of the first sliding column away from the lower pressing plate, the hydraulic cylinder is arranged on the fixed plate, the driving end of the hydraulic cylinder is close to the upper pressing plate, and the hydraulic cylinder is used to drive the upper pressing plate close to the lower pressing plate;
[0016] Lower stretching plates are arranged on both sides of the lower pressure plate, and second sliding columns parallel to the first sliding columns are arranged on the lower stretching plate, and an upper stretching plate is slidably connected to the second sliding column, and the upper stretching plate is detachably connected to the upper pressure plate, and a pulling and pressing plate is arranged at the driving end of the hydraulic cylinder, and a pressing column and a fixed pulley corresponding to the upper stretching plate are arranged on the pulling and pressing plate, and the pressing column is located between the upper stretching plate and the pulling and pressing plate, and the fixed pulley is rotatably connected to the pulling and pressing plate, and a connecting rope matching the fixed pulley is arranged on the fixed pulley, and two ends of the connecting rope are fixedly connected to the upper stretching plate and the upper pressure plate respectively.
[0017] Furthermore, the fixed plate and the lower pressure plate are slidably connected to the first sliding column, and both ends of the first sliding column are provided with threads and a fixing nut and a fastening nut threadedly connected to the first sliding column, and the fixing nut and the fastening nut are used to fix the fixed plate and the lower pressure plate.
[0018] Furthermore, the upper pressing plate and the lower pressing plate are provided with clamping seats, the clamping seats are provided with clamping claws, and the clamping claws are used to clamp the concrete sample.
[0019] Furthermore, the upper pressing plate and the lower pressing plate are provided with knife-edge hinge supports, and the clamping seat is provided on the knife-edge hinge supports.
[0020] Furthermore, the corrosion device comprises a box body, a part of the concrete sample is located in the box body, and sponge and stainless steel mesh are filled between the box body and the concrete sample.
[0021] Furthermore, the box body is made of a non-conductive transparent material.
[0022] Furthermore, the driving device is provided with a pressure sensor and a linear variable differential transformer, and the concrete sample is provided with a vibrating-wire strain sensor.
[0023] The invention can make the concrete specimen corrode while being under the action of constant compressive load, test the creep deformation of the concrete specimen when it is slowly corroded, and improve the understanding of concrete performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The present invention is a schematic diagram of a creep and corrosion test device for reinforced concrete components. Figure 1 .
[0025] Figure 2 The present invention is a schematic diagram of a creep and corrosion test device for reinforced concrete components. Figure 2 .
[0026] Among them, 1-lower pressure plate; 2-first sliding column; 3-fixed plate; 4-upper pressure plate; 5-driving device; 6-concrete sample; 7-corrosion device; 8-lower stretching plate; 9-second sliding column; 10-upper stretching plate; 11-tension and pressure plate; 12-pressing column; 13-fixed pulley; 14-connecting rope; 15-clamping seat; 16-fixing nut; 17-fastening nut. DETAILED DESCRIPTION
[0027] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.
[0028] like Figure 1-2 As shown, the present invention provides a creep and corrosion test device for reinforced concrete components, including a lower pressing plate 1, on which a plurality of first sliding columns 2 are evenly distributed, and a driving device and an upper pressing plate 4 are also provided on the first sliding columns 2, the driving device is fixedly connected to the first sliding columns 2, the upper pressing plate 4 is located between the driving device and the lower pressing plate 1 and is slidingly connected to the first sliding columns 2, the driving end of the driving device is connected to the upper pressing plate 4, so that the upper pressing plate 4 is driven by the driving device to approach or move away from the lower pressing plate 1, a concrete sample 6 detachably connected to the upper pressing plate 4 and the lower pressing plate 1 is provided between the upper pressing plate 4 and the lower pressing plate 1, and a corrosion device 7 for corroding the concrete sample 6 is provided on the concrete sample 6.
[0029] The staff can use the driving device to move the upper pressing plate 4 closer to or away from the lower pressing plate 1, so that the concrete sample 6 is subjected to compression or tension, thereby performing a creep deformation test on the concrete sample 6. When performing the creep test, the staff can start the corrosion device 7 to corrode the concrete sample 6 and perform the corrosion test simultaneously.
[0030] In another embodiment, a plurality of first sliding columns 2 are evenly distributed on the lower pressing plate 1, and a fixed plate 3 and an upper pressing plate 4 are also provided on the first sliding column 2, the fixed plate 3 is fixedly connected to the first sliding column 2, the upper pressing plate 4 is located between the fixed plate 3 and the lower pressing plate 1 and is slidably connected to the first sliding column 2, a hydraulic cylinder 5 is provided on the fixed plate 3, and a driving end of the hydraulic cylinder 5 faces the upper pressing plate 4, so that the upper pressing plate 4 is driven to slide toward the lower pressing plate 1 through the hydraulic cylinder 5, a concrete sample 6 is provided between the upper pressing plate 4 and the lower pressing plate 1, and a corrosion device 7 for corroding the concrete sample 6 is provided on the concrete sample 6.
[0031] In actual use, the staff first places the concrete sample 6 between the lower pressing plate 1 and the upper pressing plate 4, and then slides the upper pressing plate 4 to make the two ends of the concrete sample 6 respectively contact the upper pressing plate 4 and the lower pressing plate 1, and then starts the hydraulic cylinder 5. The driving end of the hydraulic cylinder 5 extends out and drives the upper pressing plate 4 to pressurize the concrete sample 6 for a creep test. Finally, the corrosion device 7 is installed on the concrete sample 6, and the corrosion device 7 is started to corrode the concrete sample 6, and the corrosion test is carried out simultaneously.
[0032] The staff can set a pressure sensor and a linear variable differential transformer on the hydraulic cylinder 5, and set a vibrating wire strain sensor on the concrete sample 6, to detect the force of the hydraulic cylinder 5 through the pressure sensor, to detect the vertical deformation of the concrete sample 6 through the linear variable differential transformer, and to detect the surface deformation of the concrete sample 6 through the vibrating wire strain sensor.
[0033] In another embodiment, lower stretching plates 8 are fixedly connected to both sides of the lower pressure plate 1, and a plurality of second sliding columns 9 parallel to the first sliding columns 2 are evenly distributed on the lower stretching plate 8. An upper stretching plate 10 is slidably connected to the second sliding columns 9, and the upper stretching plate 10 is detachably connected to the upper pressure plate 4. A pulling and pressing plate 11 is provided on the driving end of the hydraulic cylinder 5, and a pressing column 12 and a fixed pulley 13 corresponding to the upper stretching plate 10 are provided on the pulling and pressing plate 11. The pressing column 12 is in contact with the upper stretching plate 10, and the fixed pulley 13 is rotatably connected to the pulling and pressing plate 11. A connecting rope 14 is provided on the fixed pulley 13, and the connecting rope 14 passes through the fixed pulley 13, and the two ends of the connecting rope 14 are respectively fixedly connected to the upper stretching plate 10 and the upper pressure plate 4.
[0034] During the test, the staff can fix the two ends of the concrete sample 6 on the upper pressure plate 4 and the lower pressure plate 1 respectively, then release the fixation of the upper tension plate 10 and the upper pressure plate 4, and start the hydraulic cylinder 5. When the hydraulic cylinder 5 is extended, the tension plate 11 will have a movement tendency to move toward the upper pressure plate 4. At this time, the pressing column 12 on the tension plate 11 will give the upper tension plate 10 a force to move toward the concrete sample 6. At the same time, the connecting rope 14 on the upper tension plate 10 will transfer this force to the upper pressure plate 4. Since the connecting rope 14 passes through the fixed pulley 13 and is connected to the upper pressure plate 4, the connecting rope 14 and the fixed pulley 13 will change the direction of the force, so that the upper pressure plate 4 is subjected to a force away from the concrete sample 6, and then the concrete sample 6 is subjected to a tensile force, so as to realize the tensile creep test of the concrete sample 6 without the use of additional test equipment. When the compression creep test is required, it is only necessary to re-fix the upper tension plate 10 and the upper pressure plate 4 to each other.
[0035] In another embodiment, a clamping seat 15 is provided on the upper pressing plate 4 and the lower pressing plate 1 , and a clamping claw is provided on the clamping seat 15 . The staff can clamp the concrete sample 6 by the clamping claw, thereby facilitating the fixing and disassembly of the concrete sample 6 .
[0036] In another embodiment, a knife-edge hinge support is provided on the upper pressing plate 4 and the lower pressing plate 1, and the clamping seat 15 is provided on the knife-edge hinge support. Before the test, the staff can use the knife-edge hinge support to center and level the clamping seat 15 to ensure that the concrete sample 6 is evenly stressed during the test.
[0037] In another embodiment, the corrosion device 7 includes a box body, which is made of a non-conductive transparent material, a part of the concrete sample 6 is enclosed in the box body, and a sponge and a stainless steel mesh are filled between the box body and the concrete sample 6. The staff can electrify the stainless steel mesh to corrode the concrete sample 6.
[0038] In another embodiment, the fixed plate 3 and the lower pressure plate 1 are both slidably connected to the first sliding column 2, and threads are provided at both ends of the first sliding column 2, as well as a fixing nut 16 and a fastening nut 17 threadedly connected to the first sliding column 2, and the fixing nut 16 and the fastening nut 17 are respectively located on both sides of the fixed plate 3 and the lower pressure plate 1.
[0039] The staff can rotate the fixing nut 16 and the tightening nut 17 according to the size of the concrete sample 6 to be tested and slide the fixing plate 3 and the lower pressure plate 1 until their positions are adapted to the concrete sample 6, and then temporarily fix the fixing plate 3 and the lower pressure plate 1 on the first sliding column 2 by the fixing nut 16 and the tightening nut 17, so as to facilitate the testing of concrete samples 6 of different sizes.
[0040] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, belong to the protection scope of the present invention.
Claims
1. A creep and corrosion test device for reinforced concrete components, characterized in that: include: Lower pressing plate (1); A first sliding column (2) is arranged on the lower pressing plate (1); An upper pressing plate (4) is slidably connected to the first sliding column (2); A driving device, used for driving the upper pressing plate (4) along the first sliding column (2) to move closer to or away from the lower pressing plate (1); A concrete sample (6) is arranged between the lower pressing plate (1) and the upper pressing plate (4), and is detachably connected to the lower pressing plate (1) and the upper pressing plate (4); The corrosion device (7) is arranged on the concrete sample (6) and is used for corroding the concrete sample (6).
2. A reinforced concrete member creep and corrosion test device as claimed in claim 1, characterized in that: The driving device comprises a fixed plate (3) and a hydraulic cylinder (5); the fixed plate (3) is arranged at one end of the first sliding column (2) away from the lower pressing plate (1); the hydraulic cylinder (5) is arranged on the fixed plate (3); the driving end of the hydraulic cylinder (5) is close to the upper pressing plate (4); and the hydraulic cylinder (5) is used to drive the upper pressing plate (4) close to the lower pressing plate (1).
3. A reinforced concrete member creep and corrosion test device as claimed in claim 1, characterized in that: The driving device comprises a fixed plate (3) and a hydraulic cylinder (5), wherein the fixed plate (3) is arranged at an end of the first sliding column (2) away from the lower pressing plate (1), and the hydraulic cylinder (5) is arranged on the fixed plate (3), and the driving end of the hydraulic cylinder (5) is close to the upper pressing plate (4), and the hydraulic cylinder (5) is used to drive the upper pressing plate (4) close to the lower pressing plate (1); Lower stretching plates (8) are arranged on both sides of the lower pressure plate (1), and a second sliding column (9) parallel to the first sliding column (2) is arranged on the lower stretching plate (8), and an upper stretching plate (10) is slidably connected to the second sliding column (9), and the upper stretching plate (10) is detachably connected to the upper pressure plate (4). A pulling and pressing plate (11) is arranged at the driving end of the hydraulic cylinder (5), and a pressing column (12) and a fixed pulley (13) corresponding to the upper stretching plate (10) are arranged on the pulling and pressing plate (11), and the pressing column (12) is located between the upper stretching plate (10) and the pulling and pressing plate (11), and the fixed pulley (13) is rotatably connected to the pulling and pressing plate (11), and a connecting rope (14) matching the fixed pulley (13) is arranged on the fixed pulley (13), and the two ends of the connecting rope (14) are respectively fixedly connected to the upper stretching plate (10) and the upper pressure plate (4).
4. A reinforced concrete member creep and corrosion test device as claimed in claim 2 or 3, characterized in that: The fixing plate (3) and the lower pressing plate (1) are slidably connected to the first sliding column (2); both ends of the first sliding column (2) are provided with threads and a fixing nut (16) and a fastening nut (17) threadedly connected to the first sliding column (2); the fixing nut (16) and the fastening nut (17) are used to fix the fixing plate (3) and the lower pressing plate (1).
5. A reinforced concrete member creep and corrosion test device as claimed in claim 1, characterized in that: The upper pressing plate (4) and the lower pressing plate (1) are provided with a clamping seat (15), and the clamping seat (15) is provided with a clamping claw, and the clamping claw is used to clamp the concrete sample (6).
6. A reinforced concrete member creep and corrosion test device as claimed in claim 5, characterized in that: The upper pressing plate (4) and the lower pressing plate (1) are provided with knife-edge hinge supports, and the clamping seat (15) is provided on the knife-edge hinge supports.
7. A reinforced concrete member creep and corrosion test device as claimed in claim 1, characterized in that: The corrosion device (7) comprises a box body, a part of the concrete sample (6) is located in the box body, and a sponge and a stainless steel mesh are filled between the box body and the concrete sample (6).
8. A reinforced concrete member creep and corrosion test device as claimed in claim 7, characterized in that: The box body is made of non-conductive transparent material.
9. A reinforced concrete member creep and corrosion test device as claimed in claim 1, characterized in that: The driving device is provided with a pressure sensor and a linear variable differential transformer, and the concrete sample (6) is provided with a vibrating wire strain sensor.