Concrete dry-wet cycle erosion test device in real offshore environment

Abstract

The utility model discloses a concrete dry-wet cycle erosion test device in an offshore real environment, which comprises two mounting plates, the two mounting plates are respectively mounted in the offshore environment through fixing rods, the two mounting plates are oppositely arranged, a rotating shaft is rotatably mounted between the two mounting plates, a rotating bracket is fixed on the rotating shaft, and the rotating bracket is fixed on the mounting plates. A concrete test block is fixed on the rotating bracket through a buckle; a control box is mounted on any mounting plate, a controller, a storage battery and a driving mechanism are arranged in the control box, the storage battery and the driving mechanism are electrically connected with the controller, and the output end of the driving mechanism is fixedly connected with the rotating shaft. The test device is installed under the offshore marine environment condition, a concrete test block fixed to the device is made to automatically achieve multiple times of dry-wet circulation within the same time in a rotating mode, the labor cost and the time cost are saved, meanwhile, the test effect under the real environment is fully simulated, and the obtained result has higher reference value.

Description

Technical Field

[0001] The utility model relates to the technical field of durability research of offshore engineering structural materials, in particular to a concrete dry-wet cycle erosion test device under a real offshore environment. Background Art

[0002] Concrete structures in offshore environments can be divided into underwater zones, tidal zones, splash zones, and atmospheric exposure zones based on their contact with seawater. Chloride is the most abundant corrosive medium in seawater. Consequently, concrete structures can suffer from various durability issues, such as shorter-than-expected service life, due to the intrusion of chloride ions. Concrete structures in tidal and splash zones often experience alternating dry-wet cycles, and relevant research has demonstrated that this state exacerbates chloride ion corrosion. An article by Zhang Liming et al. shows that dry-wet cycles increase the diffusion rate of chloride ions into concrete structures. Han Xueqiang et al. found that dry-wet cycles can increase the size of the surface pore structure of concrete specimens more than simple immersion, promoting chloride ion corrosion. Research by Hua Yuntao et al. shows that increasing the number of dry-wet cycles significantly exacerbates the chloride ion diffusion process.

[0003] However, most current dry-wet cycle simulation tests are conducted indoors by manual handling or machines, and the final results cannot fully reflect the impact of the real environment. In real offshore environmental conditions, the number of dry-wet cycles a concrete component experiences within a fixed time is very small. If a test simulation is required to obtain relevant data, it will take a long time. At the same time,

[0004] Based on the above technical problems, the applicant proposed a concrete dry-wet cycle corrosion test device in a real offshore environment. Utility Model Content

[0005] The purpose of this utility model is to provide a concrete dry-wet cycle corrosion test device in a real offshore environment to solve the technical problems mentioned in the background technology. The purpose of this utility model is achieved through the following technical solutions:

[0006] A device for testing dry-wet cycle corrosion of concrete in a real offshore environment comprises mounting plates. Two mounting plates are respectively mounted in the offshore environment via fixing rods. The two mounting plates are arranged opposite to each other. A rotating shaft is rotatably mounted between the two mounting plates. A rotating bracket is fixed on the rotating shaft. A concrete test block is fixed to the rotating bracket via a buckle. A control box is mounted on any mounting plate. The control box contains a controller, a battery, and a drive mechanism. The battery and the drive mechanism are electrically connected to the controller. The output end of the drive mechanism is fixedly connected to the rotating shaft.

[0007] Furthermore, a heating pad is provided in the rotating bracket, and the heating pad is electrically connected to the controller.

[0008] Furthermore, a microwave sensor and a temperature sensor are installed on the mounting plate. The positions of the microwave sensor and the temperature sensor match the positions of the concrete test block. The microwave sensor and the temperature sensor are electrically connected to the controller respectively.

[0009] Furthermore, the controller includes a control module, a wireless module and a data acquisition module.

[0010] Furthermore, a solar panel is installed on the top of the mounting plate, and the solar panel is electrically connected to the battery.

[0011] Furthermore, a plurality of threaded holes are evenly formed on the upper portion of the fixing rod, a connecting sleeve is welded and fixed to the side surface of the mounting plate, and a connecting hole matching the threaded hole is formed on the connecting sleeve.

[0012] Furthermore, a supporting foot is fixed to the lower part of the fixing rod, the supporting foot is in an inverted L shape, and the three supporting feet are evenly distributed along the circumference of the fixing rod.

[0013] Furthermore, a hydroelectric generator is fixed to the lower end of the fixing rod, and the hydroelectric generator is electrically connected to the battery.

[0014] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0015] 1. The test device is installed in offshore marine environment conditions. The concrete test block fixed on the device is rotated to automatically achieve multiple dry-wet cycles in the same time. While saving labor and time costs, it also fully simulates the test effect in a real environment, making the results more valuable for reference.

[0016] 2. By placing a graphene heating pad on the rotating bracket, the concrete specimen can be fully dried, shortening the interval between dry-wet cycles and improving the efficiency of dry-wet cycles;

[0017] 3. The battery is charged and stored through solar panels and hydroelectric generators, ensuring the supply of electricity and realizing energy utilization;

[0018] 4. The microwave sensor emits a fixed frequency band, and uses the microwave changes caused by the high dielectric constant of water to measure the moisture content inside and outside the concrete test block. The temperature sensor receives the radiation wavelength of the concrete test block and measures its surface temperature. The rotating shaft is automatically controlled based on the moisture content and temperature data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of this application, 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.

[0020] Figure 1 This is a front view of the test device according to the embodiment of the present application;

[0021] Figure 2 This is a top view of the test device of the embodiment of the present application;

[0022] Figure 3 This is a side view of the test device of the embodiment of the present application;

[0023] Figure 4 Cross-sectional view of the test device in the embodiment of the present application.

[0024] Markings in the attached figure: 1. Solar panel; 2. Mounting plate; 21. Connecting sleeve; 3. Temperature sensor; 4. Microwave sensor; 5. Rotating bracket; 51. C-type buckle; 6. Control box; 7. Heating pad; 8. Rotating shaft; 9. Fixing rod; 91. Threaded hole; 10. Hydroelectric generator. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings and specific implementation methods of the specification. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present utility model.

[0026] like Figure 1-4 The device, shown here, is a device for testing concrete dry-wet cyclic corrosion in a real offshore environment. The device includes two mounting plates 2, each mounted in the offshore environment via a fixing rod 9. The two mounting plates 2 are positioned opposite each other, with a rotating shaft 8 rotatably mounted between them. An L-shaped rotating bracket 5 is fixed to the rotating shaft 8, and a concrete test block is secured to the rotating bracket 5 via a C-shaped clip 51. A control box 6 is mounted on the outer side of the left mounting plate 2. The control box 6 houses a controller, a battery, and a drive mechanism. The battery and drive mechanism are electrically connected to the controller, and the output end of the drive mechanism is fixedly connected to the rotating shaft 8. During use, the concrete test block is secured to the rotating bracket 5, and the drive mechanism rotates the rotating shaft 8, causing the concrete test block below the rotating shaft 8 to be below the water surface, while the concrete test block above the rotating shaft 8 is above the water surface. As the rotating shaft 8 rotates, the concrete test block is alternately immersed in water or lifted above the water surface, thereby performing a dry-wet cyclic test on the concrete test block.

[0027] Specifically, if Figure 1-3As shown, there are four fixing rods 9, which form a rectangular structure. The upper part of the fixing rod 9 is a square rod with a length of 2m. The cross-sectional dimensions of the square rod are 200mm×200mm. Threaded holes 91 are evenly spaced on the rod body of the fixing rod 9. The diameter of the threaded holes is 50mm, and the spacing between two adjacent threaded holes is 100mm. The lower part of the fixing rod 9 is three inverted L-shaped support legs. The support legs and the square rod are an integrated structure, and the material used is corrosion-resistant. Adjacent support legs are spaced 120° apart to improve the stability of the fixing rod 9. Each support leg is 1m long. When in use, the support leg is inserted into the soil for a length of 500mm.

[0028] like Figure 1-3 As shown, four connecting sleeves 21 are welded to the back of the mounting plate 2. The inner ring of the connecting sleeve 21 matches the outer wall of the square rod, and the connecting sleeve 21 is provided with a connecting hole that matches the threaded hole 91. The connecting sleeve 21 is connected to the square rod, and bolts are passed through the connecting holes and screwed into the threaded holes 91 to connect the mounting plate 2 to the fixing rod 9. The height of the mounting plate 2 can be adjusted by screwing the bolts into the threaded holes 91 at different heights.

[0029] like Figure 1-4 As shown, the mounting plate 2 is a corrosion-resistant plate with a length of 1500 mm, a width of 1500 mm, and a thickness of 50 mm. A circular hole with a diameter of 150 mm is provided in the center of the mounting plate 2. The rotating shaft 8 is a thin-walled hollow circular tube with a diameter of 150 mm, a wall thickness of 30 mm, and a shaft length of 2.1 m. The rotating shaft 8 is made of corrosion-resistant material. The ends of the rotating shaft 8 are mounted between the centers of the two mounting plates 2 via bearing blocks. The left end of the rotating shaft 8 passes through the mounting plate 2 and is connected to the drive mechanism. Preferably, the drive mechanism is a motor, and the output shaft of the motor is connected to the rotating shaft 8 via a gear train.

[0030] Four holes with a size of 400mm×50mm are provided on the shaft body of the rotating shaft 8. The four holes are arranged spirally around the shaft body of the rotating shaft 8. Adjacent holes are rotated 90° around the rotating shaft 8, and the spacing between adjacent holes is 100mm. Four L-shaped rotating brackets 5 are welded at the holes respectively. The L-shaped rotating bracket 5 is welded by two hollow fixed plates, one of which is welded at the hole of the rotating shaft 8 and is connected to the interior of the rotating shaft 8, with a size of 400mm×500mm×50mm. The other fixed plate is vertically welded to the end of the first fixed plate, with a size of 400mm×150mm×50mm. The concrete test block is fixed to the rotating bracket 5 by three C-shaped clips 51. The C-shaped clips 51 are respectively installed at both ends and the middle position of the concrete test block to ensure the firmness of the installation of the concrete test block.

[0031] A graphene heating pad 7 is fixed inside the rotating bracket 5, and the graphene heating pad 7 is connected to the control box 6 through a wire inside the rotating shaft 8. When the concrete test block rotates above the water surface, the graphene heating pad 7 heats the concrete test block to shorten the drying time of the concrete test block.

[0032] As a preferred embodiment of the present application, a temperature sensor 3 and a microwave sensor 4 are installed on the inner side of the left mounting plate 2. The positions of the temperature sensor 3 and the microwave sensor 4 match the position of the concrete test block when it is at the highest point. The controller includes a control module, a wireless module and a data acquisition module. The temperature sensor 3 and the microwave sensor 4 are electrically connected to the data acquisition module respectively. The temperature sensor 3 measures the surface temperature of the concrete test block by receiving the radiation wavelength of the concrete test block; the microwave sensor emits a fixed frequency band and uses the microwave changes caused by the high dielectric constant of water to measure the moisture content inside and outside the concrete test block. The controller receives the moisture content and temperature information of the concrete test block through the data acquisition module, controls the rotation of the rotating shaft 8 and the heating of the graphene heating pad 7 after analysis by the control module, and sends the information to the remote PC through the wireless module for remote monitoring of the status of the test device.

[0033] As a preferred embodiment of the present application, a plurality of solar panels 1 are installed on the top of the mounting plate 2, and a hydroelectric generator 10 is fixed to the lower end of the fixing rod 9. The solar panels 1 and the hydroelectric generator 10 are electrically connected to the battery, and are used to convert the kinetic energy of solar energy and seawater into electrical energy and store it in the battery, thereby providing electrical energy for the rotation and heating of the test device.

[0034] The working principle of the embodiment of this application is as follows:

[0035] First, the entire device is placed in an offshore environment close to the shore through the fixing rod 9, and the concrete test blocks are fixed to the rotating bracket 5 with the C-shaped buckle 51. All concrete test blocks are kept in the initial position for a period of time.

[0036] When the device is started, the battery in the control box 6 starts to supply power, and at the same time, the solar panel 1 located on the top of the device and the hydroelectric generator 10 in the underwater part of the fixing rod 9 respectively charge the battery;

[0037] After the motor in the control box 6 is powered on, it drives the rotating shaft 8 to rotate 90° clockwise through the gear set. At this time, the concrete test block, which has been rotated to the atmospheric exposure zone, begins to be dried by the graphene heating pad 7 inside the rotating bracket 5. The microwave sensor 4 and the temperature sensor 3 installed on the upper part of the mounting plate 2 respectively start to monitor the concrete test piece and send the collected data to the remote PC for real-time recording through the wireless module inside the control box 6. When the surface humidity and temperature of the concrete test block reach the preset values, the motor drives the rotating shaft 8 to rotate 90° clockwise again through the gear set.

[0038] This device can enable concrete components to automatically achieve multiple dry-wet cycles within the same time under real offshore environmental conditions. Each dry-wet cycle can allow the concrete specimen to experience different states from complete dryness to alternating dry-wetness and then to complete soaking, making the obtained test simulation results have higher reference value.

[0039] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0040] 1. The test device is installed in offshore marine environment conditions. The concrete test block fixed on the device is rotated to automatically achieve multiple dry-wet cycles in the same time. While saving labor and time costs, it also fully simulates the test effect in a real environment, making the results more valuable for reference.

[0041] 2. By placing a graphene heating pad on the rotating bracket, the concrete specimen can be fully dried, shortening the interval between dry-wet cycles and improving the efficiency of dry-wet cycles;

[0042] 3. The battery is charged and stored through solar panels and hydroelectric generators, ensuring the supply of electricity and realizing energy utilization;

[0043] 4. The microwave sensor emits a fixed frequency band, and uses the microwave changes caused by the high dielectric constant of water to measure the moisture content inside and outside the concrete test block. The temperature sensor receives the radiation wavelength of the concrete test block and measures its surface temperature. The rotating shaft is automatically controlled based on the moisture content and temperature data.

[0044] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A concrete dry-wet cycle corrosion test device in a real offshore environment, characterized by: It includes a mounting plate, two of the mounting plates are respectively installed in an offshore environment through fixing rods, the two mounting plates are arranged opposite to each other, a rotating shaft is rotatably installed between the two mounting plates, a rotating bracket is fixed on the rotating shaft, and the concrete test block is fixed to the rotating bracket by a buckle; a control box is installed on any of the mounting plates, and a controller, a battery and a drive mechanism are set in the control box, the battery and the drive mechanism are electrically connected to the controller, and the output end of the drive mechanism is fixedly connected to the rotating shaft.

2. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, characterized in that: A heating pad is provided in the rotating bracket, and the heating pad is electrically connected to the controller.

3. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 2, characterized in that: A microwave sensor and a temperature sensor are installed on the mounting plate. The positions of the microwave sensor and the temperature sensor match the positions of the concrete test block. The microwave sensor and the temperature sensor are electrically connected to the controller respectively.

4. A dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, 2 or 3, characterized in that: The controller includes a control module, a wireless module and a data acquisition module.

5. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, characterized in that: A solar panel is installed on the top of the mounting plate, and the solar panel is electrically connected to the battery.

6. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, characterized in that: A plurality of threaded holes are evenly formed on the upper portion of the fixing rod, a connecting sleeve is welded and fixed to the side surface of the mounting plate, and a connecting hole matching the threaded holes is formed on the connecting sleeve.

7. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, characterized in that: A supporting foot is fixed to the lower part of the fixing rod, and the supporting foot is in an inverted L shape. The three supporting feet are evenly distributed along the circumference of the fixing rod.

8. The dry-wet cycle corrosion test device for concrete in a real offshore environment according to claim 1, characterized in that: A hydroelectric generator is fixed to the lower end of the fixing rod, and the hydroelectric generator is electrically connected to the battery.

Images