Dry-wet cycle test equipment for concrete and method of dry-wet cycle test equipment

Abstract

The invention discloses a dry-wet cycle test device and method for concrete, the dry-wet cycle test device comprises a rack, a test box installed in the rack, and a first liquid pumping assembly and a second liquid pumping assembly respectively installed on the front and rear inner walls of the test box, and a chloride ion electrode is installed on the outer wall of one side of the test box; a chain wheel speed reduction type self-rotating structure used for bearing a concrete sample piece and driving the concrete sample piece to rotate is installed at the center position of the bottom of the test box, and an annular column type forced air drying assembly used for drying the concrete sample piece is installed at the position, above the chain wheel speed reduction type self-rotating structure, of the top end of the rack. According to the invention, surge impact is continuously formed in the box by the double-rocking type wave making assembly, and the chain wheel speed reduction type spinning structure drives the sample piece to rotate, so that a dynamic test platform which highly simulates an actual marine environment is constructed, and the problem that a traditional dry-wet cycle test lacks mechanical impact and fluid dynamic conditions is effectively solved; and the stability and accuracy of the chemical environment are ensured through automatic control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete detection, in particular to a dry-wet cycle test equipment for concrete and a method thereof. BACKGROUND

[0002] The concrete dry-wet cycle test simulates the dry-wet alternating process experienced by concrete structures in marine environments to evaluate their durability and corrosion resistance. The test uses high-purity sodium chloride and sodium sulfate dissolved in deionized water to prepare simulated seawater solution, making the ion environment closer to actual marine conditions. The sample is first cured and then soaked in the simulated solution, and the ions diffuse into the concrete pores, simulating the continuous corrosion of seawater on concrete. Then the sample is taken out for drying treatment, simulating the environment of tidal changes or air exposure, so that the internal moisture evaporates and generates salt crystallization pressure, which in turn affects the microstructure of the concrete. The dry-wet cycle process is repeated to accelerate the degradation process of the concrete. During the test, researchers monitor the changes in the physical and mechanical properties of the concrete, including strength, porosity, and steel corrosion, to comprehensively evaluate the degradation of material performance. Environmental parameters such as temperature and humidity are strictly controlled to ensure the scientificity and repeatability of the test. As disclosed in a kind of concrete dry-wet cycle durability test equipment of authorized announcement No. CN118425012B, including barrel for the installation of each component;Mixing assembly is set in barrel, mixing assembly carries out the stirring to mixed solution in barrel and guarantees the concentration of solution in the barrel uniform stable, and the mixing assembly is intermittent operation;Detection component is set in barrel, detection component is used to carry out real-time detection to the temperature and concentration parameters of mixed solution in barrel and carry out real-time detection to the temperature and humidity of air in barrel, so it can be seen that the above technical solution when carrying out dry-wet cycle test, mainly take the way of sample immersion, however in actual marine splash zone, concrete structure continuously bears the repeated beating, scouring and erosion of sea wave carrying silt, it is a complex physical and mechanical failure process, will directly wear concrete surface, stripping has softened or loose hydrate, accelerates the loss of material, and static immersion test only provides chemical erosion environment, completely strips the synergistic destruction effect of this mechanical force.The result is, test can seriously underestimate the speed and degree of wave mechanical action on the surface integrity of concrete, cannot simulate the accelerated influence of surface wear on internal material exposure and erosion process;At the same time in real surge environment, the beating of sea wave can produce huge impact pressure on concrete structure instantaneously, this dynamic water pressure can force sea water rich in ions to press into the pores and microcracks of concrete more quickly and deeply, greatly accelerates the invasion rate and depth of chloride ion and sulfate ion, therefore the mechanism difference between static diffusion and dynamic pressure penetration, the migration speed and distribution mode of ion in laboratory test are not consistent with actual, can make the key indicators such as chloride ion penetration depth measured in laboratory be too conservative, cannot reflect the more severe erosion condition under surge pressure. SUMMARY

[0003] The purpose of the present application is to provide a concrete dry-wet cycle test equipment and method, the concrete sample column to be subjected to dry-wet cycle test passes through the ring column type air blowing drying assembly and is placed on the chain wheel reduction type self-rotation structure at the bottom of the test box. The pump liquid assembly one and two are controlled to inject the mixed solution of the well-proportioned sodium chloride reagent, sodium sulfate reagent and deionized water into the test box according to the chloride ion electrode signal on the inner wall of the test box by the control panel, and the double-shaking wave-making assembly and the chain wheel reduction type self-rotation structure are driven to work by the rotary drive assembly. The wave impact is continuously formed in the box by the double-shaking wave-making assembly, and the sample is self-rotated by the chain wheel reduction type self-rotation structure, so as to simulate the sea wave impact environment, thereby solving the problems in the background art.

[0004] In order to achieve the above object, the present application provides the following technical scheme: a dry-wet cycle test equipment for concrete, comprising a rack, a test box installed inside the rack, and pump liquid assembly one and pump liquid assembly two installed on the inner walls in front and back of the test box, a chloride ion electrode is installed on the outer wall of one side of the test box, a chain wheel reduction type self-rotation structure for supporting the concrete sample and driving it to rotate is installed at the center position of the bottom of the test box, a ring column type air blowing drying assembly for drying the concrete sample is installed at the top of the rack above the chain wheel reduction type self-rotation structure, a double-oscillation wave making assembly is installed at the upper position inside the test box, a bevel gear reversing transmission structure for power connection is installed between the input shaft of the double-oscillation wave making assembly and the input shaft of the chain wheel reduction type self-rotation structure, a rotary drive assembly for driving the double-oscillation wave making assembly to work is installed on one side inside the test box, a control panel is installed on the outer wall of the test box on one side of the chloride ion electrode, the output end of the control panel is electrically connected with the input end of the pump liquid assembly one, the pump liquid assembly two, the ring column type air blowing drying assembly and the rotary drive assembly respectively, and the input end of the control panel is electrically connected with the output end of the chloride ion electrode.

[0005] Preferably, the rotary drive assembly comprises a double-arm frame fixed at the upper position inside the test box, a reduction motor installed at the side corner position at the top end of the double-arm frame, and a turntable fixed at the output shaft end of the reduction motor, one end of the surface of the turntable is hinged with a first fisheye connecting rod, and the input end of the reduction motor is electrically connected with the output end of the control panel.

[0006] Preferably, the double-oscillation wave making assembly comprises a main transmission shaft, a secondary transmission shaft and a swing arm, the main transmission shaft and the secondary transmission shaft are rotatably installed at the left and right positions inside the double-arm frame through bearing seats, and the two ends of the main transmission shaft and the secondary transmission shaft are both fixedly installed with the swing arm, a chain wheel constant speed transmission structure is installed between the main transmission shaft and the secondary transmission shaft, one end of the surface of the main transmission shaft is fixed with a rocker arm, and the upper end of the rocker arm is hinged with the lower end of the first fisheye connecting rod.

[0007] Preferably, the edge corner positions at the bottom end of the double-arm frame are both fixed with a circular guide rail, a U-shaped slide is slidingly installed between the two circular guide rails in the length direction of the same side, a hollow blocking frame is fixed at the bottom end of the U-shaped slide, the lower end of the swing arm is hinged with a second fisheye connecting rod, and one end of the second fisheye connecting rod away from the swing arm is hinged with the outer wall of one side of the U-shaped slide.

[0008] Preferably, the chain wheel reduction type self-rotating structure comprises a shell fixed at the center of the bottom end of the test box, a reduction gear shaft rotatably installed at the center of the inside of the shell, and a driven gear shaft rotatably installed at one side edge of the inside of the shell, the driven gear shaft and the reduction gear shaft are engaged, the top end of the reduction gear shaft is fixed with a tray, the chain wheel reduction type self-rotating structure further comprises a vertical shaft rotatably installed on the inner wall of one side of the test box through a bearing seat, the upper end of the vertical shaft is powerfully connected with the main transmission shaft through a bevel gear reversing transmission structure, and the lower end of the vertical shaft penetrates to the outside of the test box and is installed with a chain wheel transmission structure for powerfully connecting with the lower end of the driven gear shaft.

[0009] Preferably, the bevel gear reversing transmission structure comprises a driving bevel gear fixed at one end of the surface of the main transmission shaft and a driven bevel gear fixed at the upper end of the vertical shaft, the driven bevel gear and the driving bevel gear are engaged, and the chain wheel transmission structure comprises a main chain wheel fixed at the lower end of the vertical shaft and a secondary chain wheel fixed at the lower end of the driven gear shaft, and a chain is installed between the secondary chain wheel and the main chain wheel.

[0010] Preferably, the ring column type air blowing drying assembly comprises an I-shaped air duct erected at the top end of the rack, an arc-shaped air duct installed on the front and rear outer walls of the I-shaped air duct, and an air blower installed at the right side position of the top end of the rack, a Y-shaped pipe is installed at the outlet end of the air blower, one end of the Y-shaped pipe away from the air blower is connected with the arc-shaped air duct, the input end of the air blower is electrically connected with the output end of the control panel, and the I-shaped air duct is coaxial with the tray.

[0011] Preferably, the arc-shaped air duct and the Y-shaped pipe are both made of hard plastic material.

[0012] Preferably, an electric heating rod is installed in each bypass pipeline of the Y-shaped pipe away from the air blower, and the input end of the electric heating rod is electrically connected with the output end of the control panel.

[0013] The application also provides a dry-wet cycle test method of concrete, which uses the dry-wet cycle test equipment of concrete as described above and comprises the following steps: S101: preparing a columnar concrete sample, passing a standard cylindrical concrete sample from the ring column type air blowing drying assembly and stably placing the standard cylindrical concrete sample on the chain wheel reduction type self-rotating structure at the bottom of the test box, ensuring that the concrete sample is placed firmly, mixing accurately weighed sodium chloride and sodium sulfate reagents with deionized water in the pump liquid assembly one and the pump liquid assembly two according to the concentration required by the experimental design, and then manually starting the pump liquid assembly one and the pump liquid assembly two through the control panel to inject a quantitative mixed solution into the test box until the liquid level reaches a preset height; S102: The worker starts the rotating drive assembly and the ring column type air blowing drying assembly through the control panel, and air is blown to the outer wall of the concrete sample and the test box by the ring column type air blowing drying assembly; the power of the rotating drive assembly is transmitted to the double-shaking wave making assembly and the chain wheel deceleration type self-rotation structure, the double-shaking wave making assembly generates continuous and fluctuating surges in the test box to make dynamic fluid impact on the surface of the sample, and the chain wheel deceleration type self-rotation structure drives the sample to rotate while bearing the surge impact; S103: In the process of the dry-wet cycle test, the control panel judges the chloride ion electrode signal monitored in real time: if the solution in the test box is flushed and attached to the sample, so that the ion concentration is lower than the set threshold value, the pump liquid assembly one and the pump liquid assembly two are automatically triggered to re-inject the mixed solution to restore and maintain the dynamic stability of the solution concentration; S104: After the dry-wet cycle test is completed, the worker turns off the equipment, and the sample is taken out of the test box for detection and analysis of mechanical properties and microstructure to evaluate the influence of dry-wet cycle and surge impact on the durability of concrete.

[0014] Compared with the prior art, the concrete dry-wet cycle test equipment and method has the beneficial effects that: the concrete dry-wet cycle test equipment and method are provided with a test box, a chloride ion electrode, a pump liquid assembly one, a pump liquid assembly two, a ring column type air blowing drying assembly, a rotating drive assembly, a chain wheel deceleration type self-rotation structure and a double-shaking wave making assembly, and the like, which are matched with each other; a concrete sample column to be subjected to dry-wet cycle test passes through the ring column type air blowing drying assembly and is placed on the chain wheel deceleration type self-rotation structure at the bottom of the test box; the control panel controls the pump liquid assembly one and two according to the chloride ion electrode signal on the inner wall of the test box to make the mixed solution of the well-proportioned sodium chloride reagent, sodium sulfate reagent and deionized water injected into the test box, and the rotating drive assembly drives the double-shaking wave making assembly and the chain wheel deceleration type self-rotation structure to work; the double-shaking wave making assembly continuously forms surge impact in the test box, and the chain wheel deceleration type self-rotation structure drives the sample to rotate, so that a dynamic and highly simulated actual marine environment test platform is constructed, and the problem that mechanical impact and fluid dynamics conditions are lacked in the traditional dry-wet cycle test is effectively solved, and the stability and accuracy of the chemical environment are ensured through automatic control; The control panel automatically adjusts the working of the pump liquid assembly one and two according to the chloride ion electrode signal on the inner wall of the test box to realize dynamic regulation and control of the test liquid environment, the injection amount of the mixed solution of sodium chloride, sodium sulfate and deionized water is accurately controlled to ensure that the ion concentration of the simulated seawater solution is stable and meets the preset standard, and the accuracy and repeatability of the chemical corrosion environment are ensured, and the application of the ring column type air blowing drying assembly effectively ensures that the concrete sample can uniformly and quickly remove internal moisture during the dry stage in the dry-wet cycle process, so that the wetting and drying alternation change caused by the tide in the actual marine environment is truly simulated; Secondly, the double-rotating wave-making assembly simulates the dynamic mechanical load and water flow impact caused by sea wave impact by continuously forming surge impact, which not only reproduces the periodic impact force borne by the concrete foundation in the marine environment, but also simulates the physical abrasion process caused by the surge. Compared with the traditional static immersion test, the wave-making assembly can more truly reflect the influence of sea waves on the generation, expansion and mechanical fatigue of micro-cracks on the concrete surface, and provide a more comprehensive physical environment for evaluating the durability of concrete. At the same time, the rotation of the sample makes each surface of the concrete uniformly exposed to the simulated seawater environment and surge impact, avoiding the deviation of local corrosion or mechanical damage caused by fixed position, making the ion erosion and water evaporation process more uniform, and also making the mechanical impact force distribution more reasonable, thereby better reflecting the complex state of the concrete structure subjected to multi-directional and multi-angle action in the actual marine environment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the front view of the structure of the present application; Figure 2 is a schematic diagram of the structure of the present application; Figure 3 is a schematic diagram of the structure of the present application Figure 1 ; Figure 4 is a schematic diagram of the structure of the present application Figure 2 ; Figure 5 is a schematic diagram of the structure of the present application Figure 3 ; Figure 6 is a schematic diagram of the structure of the present application Figure 7 is a schematic diagram of the structure of the present application Figure 8 is a schematic diagram of the structure of the present application

[0016] In the diagram: 1. Frame; 2. Test chamber; 3. Chloride ion electrode; 4. Pump assembly one; 5. Pump assembly two; 6. Annular column type blower drying assembly; 601. I-shaped air duct; 602. Arc-shaped air duct; 603. Y-shaped pipe; 604. Blower; 7. Double-crank wave generator assembly; 701. Main drive shaft; 702. Secondary drive shaft; 703. Sprocket constant velocity transmission structure; 704. Circular guide rail; 705. U-shaped carriage; 706. Hollow baffle frame; 707. 708. Swing arm; 8. Second fisheye connecting rod; 9. Sprocket reduction type self-rotating structure; 10. Housing; 11. Reduction gear shaft; 12. Driven gear shaft; 13. Sprocket transmission structure; 14. Vertical shaft; 15. Bevel gear reversing transmission structure; 16. Tray; 17. Control panel; 18. Rotary drive assembly; 19. Double arm type frame; 10. Gear motor; 10. Turntable; 10. First fisheye connecting rod; 10. Rocker arm. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] Example 1, by Figures 1 to 5 The present invention includes a frame 1, a test chamber 2 installed inside the frame 1, and pumping components 4 and 5 installed on the front and rear inner walls of the test chamber 2, respectively. A chloride ion electrode 3 is installed on one outer wall of the test chamber 2. A sprocket-reducing spin structure 8 for supporting and rotating a concrete sample is installed at the center of the bottom of the test chamber 2. A ring-column type blower drying component 6 for drying the concrete sample is installed at the top of the frame 1 above the sprocket-reducing spin structure 8. A double-rocking wave generator 7 is installed at the upper part of the interior of the test chamber 2. A bevel gear reversing transmission structure 806 for power connection is installed between the input shaft of the wave assembly 7 and the input shaft of the sprocket reduction type spin structure 8. A rotary drive assembly 10 for driving the double rocking wave assembly 7 is installed on one side inside the test chamber 2. A control panel 9 is installed on the outer wall of the test chamber 2 on one side of the chloride ion electrode 3. The output end of the control panel 9 is electrically connected to the input end of the pump liquid assembly 1 4, the pump liquid assembly 2 5, the annular column type blower drying assembly 6 and the rotary drive assembly 10, respectively. The input end of the control panel 9 is electrically connected to the output end of the chloride ion electrode 3. The pump liquid assembly 4 and pump liquid assembly 5 may not be filled with a mixture of sodium chloride, sodium sulfate reagent and deionized water, but may instead be filled with sodium chloride solvent or sodium sulfate reagent solvent alone. For example, the sodium chloride solution is injected into the pump liquid assembly 4, and the chloride ion electrode 3 is used for real-time and automatic monitoring. Based on the reading of the chloride ion electrode 3, the control panel 9 automatically adds the sodium chloride solution to stabilize the chloride ion concentration in the test box 2 within the set range. During the dry-wet cycle, the migration and concentration of chloride ions are more intense, and the consumption rate of sodium sulfate reagent is much lower than that of chloride ions. Therefore, the sodium sulfate reagent concentration can be accurately measured periodically by manual sampling once using the ion chromatograph or gravimetric method in the laboratory, and the reserve solution can be manually adjusted accordingly.

[0019] The dry-wet cycle test method of the concrete of the embodiment uses the dry-wet cycle test equipment of the concrete as described above, and includes the following steps: S101: Prepare the columnar concrete sample, pass the standard cylindrical concrete sample from the ring column type air drying assembly 6, and securely place it on the chain wheel reduction type self-rotation structure 8 at the bottom of the test box 2. Ensure that the concrete sample is placed firmly. According to the required concentration of the experimental design, accurately weigh the sodium chloride, sodium sulfate reagent, and deionized water, mix them uniformly in the pump liquid assembly 4 and the pump liquid assembly 5, and then manually start the pump liquid assembly 4 and the pump liquid assembly 5 through the control panel 9. Inject a certain amount of mixed solution into the test box 2 until the liquid level reaches the preset height. S102: The staff starts the rotation drive assembly 10 and the ring column type air drying assembly 6 by the control panel 9. The ring column type air drying assembly 6 blows air to the outer wall of the concrete sample and the test box 2. The power of the rotation drive assembly 10 is transmitted to the double-oscillating wave-making assembly 7 and the chain wheel reduction type self-rotation structure 8. The double-oscillating wave-making assembly 7 creates continuous and fluctuating surges in the test box 2, which dynamically impact the surface of the sample from all directions. The chain wheel reduction type self-rotation structure 8 drives the sample to rotate while being impacted by the surges. S103: During the dry-wet cycle test, the control panel 9 monitors the chloride ion electrode 3 signal in real time to determine whether the solution in the test box 2 has been washed and attached to the sample, causing the ion concentration to be lower than the set threshold. If so, the pump liquid assembly 4 and the pump liquid assembly 5 are automatically triggered to re-inject the mixed solution to restore and maintain the dynamic stability of the solution concentration. S104: After completing the dry-wet cycle test, the staff turns off the equipment, and the sample is taken out of the test box 2 for mechanical performance and microstructure detection and analysis to evaluate the influence of dry-wet cycle and surge impact on the durability of concrete.

[0020] In the second embodiment, based on the first embodiment, Figure 6The rotating driving assembly 10 comprises a double-arm frame 1001 fixed at an upper position inside the test tank 2, a reduction motor 1002 installed at a side corner position of the top end of the double-arm frame 1001, and a rotating disc 1003 fixed at the output shaft end of the reduction motor 1002, one end of the surface of the rotating disc 1003 is hingedly connected with a first fisheye connecting rod 1004, and the input end of the reduction motor 1002 is electrically connected with the output end of the control panel 9; The double-oscillating wave assembly 7 comprises a main transmission shaft 701 and a sub-transmission shaft 702 rotatably installed at left and right positions inside the double-arm frame 1001 through bearing seats, and a swing arm 707 fixedly installed at both ends of the main transmission shaft 701 and the sub-transmission shaft 702, a chain wheel constant speed transmission structure 703 is installed between the main transmission shaft 701 and the sub-transmission shaft 702, one end of the surface of the main transmission shaft 701 is fixedly connected with a swing arm 1005, the upper end of the swing arm 1005 is hingedly connected with the lower end of the first fisheye connecting rod 1004, the swing arm 1005 is fixedly connected with the input shaft of the double-oscillating wave assembly 7, and the upper end of the swing arm 1005 is hingedly connected with the lower end of the first fisheye connecting rod 1004, when the reduction motor 1002 is started to work through the control panel 9, the rotating disc 1003 is rotated by the output shaft of the reduction motor 1002, when the rotating disc 1003 rotates, the first fisheye connecting rod 1004 and the swing arm 1005 force the input shaft of the double-oscillating wave assembly 7 to rotate forward or reversely, so that the double-oscillating wave assembly 7 obtains power input; The bottom end of the double-arm frame 1001 is fixedly connected with a circular guide rail 704 at a corner position, two circular guide rails 704 on the same side in the length direction are slidably connected with a U-shaped slide 705, the bottom end of the U-shaped slide 705 is fixedly connected with a hollow blocking frame 706, the lower end of the swing arm 707 is hingedly connected with a second fisheye connecting rod 708, one end of the second fisheye connecting rod 708 away from the swing arm 707 is hingedly connected with one side of the outer wall of the U-shaped slide 705, when the main transmission shaft 701 is driven to rotate forward or reversely by the rotating driving assembly 10, the sub-transmission shaft 702 moves together with the main transmission shaft 701 under the driving of the chain wheel constant speed transmission structure 703, the two ends of the main transmission shaft 701 drive the U-shaped slide 705 and the hollow blocking frame 706 to linearly slide through the swing arm 707 and the second fisheye connecting rod 708, so that the hollow blocking frames 706 on both sides inside the test tank 2 move synchronously and push the mixed solution in the test tank 2, thereby generating a rhythmic and suitable-intensity water flow impact to simulate the mechanical fatigue and abrasion effect caused by sea wave beating.

[0021] In the embodiment three, based on the embodiment two, Figure 7The chain wheel reduction type self-rotation structure 8 comprises a shell 801 fixed at the center of the bottom end of the test box 2, a reduction gear shaft 802 rotatably installed at the center of the inside of the shell 801, and a driven gear shaft 803 rotatably installed at one side edge of the inside of the shell 801, the driven gear shaft 803 and the reduction gear shaft 802 are engaged, the top end of the reduction gear shaft 802 is fixed with a tray 807, the chain wheel reduction type self-rotation structure 8 further comprises a vertical shaft 805 vertically rotatably installed on the inner wall of one side of the test box 2 through a bearing seat, the upper end of the vertical shaft 805 is in power connection with the main transmission shaft 701 through a bevel gear reversing transmission structure 806, and the lower end of the vertical shaft 805 penetrates to the outside of the test box 2 and is installed with a chain wheel transmission structure 804 for keeping power connection with the lower end of the driven gear shaft 803; The bevel gear reversing transmission structure 806 comprises a driving bevel gear fixed at one end of the surface of the main transmission shaft 701 and a driven bevel gear fixed at the upper end of the vertical shaft 805, the driven bevel gear and the driving bevel gear are engaged, the chain wheel transmission structure 804 comprises a main chain wheel fixed at the lower end of the vertical shaft 805 and a secondary chain wheel fixed at the lower end of the driven gear shaft 803, and a chain is installed between the secondary chain wheel and the main chain wheel; During the forward and reverse rotation of the main transmission shaft 701, the rotary power of the main transmission shaft 701 is transmitted to the driven gear shaft 803 through the bevel gear reversing transmission structure 806, the vertical shaft 805 and the chain wheel transmission structure 804, the driven gear shaft 803 drives the reduction gear shaft 802 and the tray 807 at the upper end of the reduction gear shaft 802 to rotate, so that the sample carried by the tray 807 rotates, and the rotation movement can uniformly expose the surface of the sample to the simulated environment, avoiding local corrosion or mechanical damage deviation caused by the fixed position.

[0022] In the fourth embodiment, on the basis of the third embodiment, Figure 8 The ring column type air blowing drying assembly 6 comprises an I-shaped air duct 601 erected at the top end of the rack 1, arc-shaped air ducts 602 installed on the front and rear outer walls of the I-shaped air duct 601, and an air blower 604 installed at the right side position of the top end of the rack 1, a Y-shaped pipe 603 is installed at the outlet end of the air blower 604, one end of the Y-shaped pipe 603 away from the air blower 604 is connected with the arc-shaped air duct 602, the input end of the air blower 604 is electrically connected with the output end of the control panel 9, the I-shaped air duct 601 and the tray 807 are coaxial, and the arc-shaped air duct 602 and the Y-shaped pipe 603 are both made of hard plastic material; When the ring column type air blowing drying assembly 6 is used to dry the outer peripheral surface of the sample, the motor speed of the air blower 604 is controlled through the control panel 9, then the air blower 604 sends high-speed airflow into the Y-shaped pipe 603 and the arc-shaped air duct 602, and the airflow enters the I-shaped air duct 601 through the arc-shaped air duct 602 and blows the outer wall of the sample, so as to promote the rapid evaporation of water. The Y-shaped pipe 603 is provided with an electric heating rod in each bypass pipe away from the air blower 604, and the input end of the electric heating rod is electrically connected with the output end of the control panel 9. The staff can also install an electric heating device inside the Y-shaped pipe 603, so that the annular cylindrical air blowing drying assembly 6 obtains the function of blowing hot air, realizes the purpose of hot air drying, and further promotes the migration of water on the surface of the sample and the crystallization process of salt.

[0023] In use, the staff first prepares the concrete sample, which is usually in a columnar structure, and ensures that its size and curing conditions meet the test requirements. After preliminary curing, the standard cylindrical concrete sample is passed through the annular cylindrical air blowing drying assembly 6 and is stably placed on the chain wheel reduction type self-rotation structure 8 at the bottom of the test box 2, ensuring that the concrete sample is placed firmly. The initial solution is prepared and poured into the test box 2, that is, the accurately weighed sodium chloride and sodium sulfate reagents are mixed uniformly in the pump liquid assembly one 4 and the pump liquid assembly two 5, and then the quantitative mixed solution is injected into the test box 2 by manually starting the pump liquid assembly one 4 and the pump liquid assembly two 5 through the control panel 9 until the liquid level reaches the preset height, so as to provide the initial chemical medium for simulating the marine immersion environment. After the preparation work is completed, the staff starts the rotation driving assembly 10 and the annular cylindrical air blowing drying assembly 6 through the control panel 9, and air is blown into the concrete sample and the test box 2 from the annular cylindrical air blowing drying assembly 6, ensuring that each surface of the sample is uniformly and efficiently dried, so as to form ion concentration crystals in the pores of the sample due to water evaporation, simulate the real situation that the concrete is exposed to sunlight and sea breeze after the tide recedes, and the power of the rotation driving assembly 10 is transmitted to the double-oscillation wave-making assembly 7 and the chain wheel reduction type self-rotation structure 8. The double-oscillation wave-making assembly 7 generates continuous and fluctuating surges in the test box 2 to perform omnidirectional dynamic fluid impact on the surface of the sample, and the chain wheel reduction type self-rotation structure 8 drives the sample to rotate while bearing the impact of the surges. By using the double motion of “rotation” and “surge”, the relative speed and shear effect between the fluid and the concrete surface are greatly enhanced, so as to simulate the complex mechanical scouring environment of the sea waves on the offshore structure foundation and significantly accelerate the transmission process of the erosive ions to the interior of the concrete. During the dry-wet cycle test, the staff judges the signal of the chloride ion electrode 3 monitored by the control panel 9 in real time: if the ion concentration of the solution in the test box 2 is lower than the set threshold value due to the scouring and adhesion of the sample, the pump liquid assembly one 4 and the pump liquid assembly two 5 are automatically triggered to re-inject the mixed solution, so as to restore and maintain the dynamic stability of the solution concentration. After the dry-wet cycle test is completed, the staff turns off the equipment, the sample is taken out of the test box 2 for detection and analysis of the mechanical properties and microstructure, so as to evaluate the influence of the dry-wet cycle and the surge impact on the durability of the concrete.

[0024] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0025] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.

Claims

1. A concrete drying and wetting cycle test apparatus, characterized by: The utility model provides a concrete chloride ion penetration test device, including frame (1), the test box (2) of installation inside frame (1) and the pump liquid subassembly one (4) of installation respectively on the inner wall of test box (2) front and back, pump liquid subassembly two (5), one side outer wall of test box (2) is installed with chloride ion electrode (3), the bottom center position of test box (2) is installed with the chain wheel deceleration type spin structure (8) for supporting concrete sample and drive it autorotation, the top of frame (1) above chain wheel deceleration type spin structure (8) is installed with the annular column type air blowing drying subassembly (6) for carrying out drying treatment to concrete sample, the upper position inside test box (2) is installed with double swing type wave making subassembly (7), and the input shaft between double swing type wave making subassembly (7) and chain wheel deceleration type spin structure (8) is installed with bevel gear reversing transmission structure (806) for carrying out power link, one side inside test box (2) is installed with the rotary drive subassembly (10) for driving double swing type wave making subassembly (7) work, and the outer wall of test box (2) on the side of chloride ion electrode (3) is installed with control panel (9), and the output of control panel (9) is electrically connected with the input of pump liquid subassembly one (4), pump liquid subassembly two (5), annular column type air blowing drying subassembly (6) and rotary drive subassembly (10) respectively, and the input of control panel (9) is electrically connected with the output of chloride ion electrode (3).

2. The apparatus for testing the drying and wetting cycle of concrete according to claim 1, wherein: The rotary drive subassembly (10) includes a double-arm frame (1001) fixed inside the test box (2), a reduction motor (1002) installed at a side corner position on the top end of the double-arm frame (1001), and a turntable (1003) fixed at the output shaft end of the reduction motor (1002), one end of the surface of the turntable (1003) is hinged with a first fisheye connecting rod (1004), and the input end of the reduction motor (1002) is electrically connected with the output end of the control panel (9).

3. The apparatus for testing the drying and wetting cycle of concrete according to claim 2, wherein: The double swing type wave making subassembly (7) includes a main transmission shaft (701), a secondary transmission shaft (702) rotatably installed at left and right positions inside the double-arm frame (1001) through bearing seats, and a swing arm (707) fixedly installed at both ends of the main transmission shaft (701) and the secondary transmission shaft (702), a chain wheel constant speed transmission structure (703) is installed between the main transmission shaft (701) and the secondary transmission shaft (702), one end of the surface of the main transmission shaft (701) is fixed with a rocker arm (1005), and the upper end of the rocker arm (1005) is hinged with the lower end of the first fisheye connecting rod (1004).

4. The apparatus for testing the freeze-thaw cycle of concrete according to claim 3, wherein: Circular guide rails (704) are fixed at corner positions of the bottom end of the double-arm frame (1001), a U-shaped slide (705) is slidingly installed between two circular guide rails (704) on the same side in the length direction, a hollow blocking frame (706) is fixed at the bottom end of the U-shaped slide (705), the lower end of the swing arm (707) is hinged with a second fisheye connecting rod (708), and one end of the second fisheye connecting rod (708) away from the swing arm (707) is hinged with one side outer wall of the U-shaped slide (705).

5. The apparatus for testing the freeze-thaw cycle of concrete according to claim 1, wherein: The sprocket reduction type self-rotating structure (8) comprises a shell (801) fixed at the center of the bottom end of the test box (2), a reduction gear shaft (802) rotatably installed at the center of the inside of the shell (801), and a driven gear shaft (803) rotatably installed at one side edge of the inside of the shell (801), the driven gear shaft (803) and the reduction gear shaft (802) are engaged, the top end of the reduction gear shaft (802) is fixed with a tray (807), the sprocket reduction type self-rotating structure (8) further comprises a vertical shaft (805) vertically rotatably installed on the inner wall of one side of the test box (2) through a bearing seat, the upper end of the vertical shaft (805) is power-connected with the main transmission shaft (701) through a bevel gear reversing transmission structure (806), and the lower end of the vertical shaft (805) penetrates to the outside of the test box (2) and is provided with a sprocket transmission structure (804) for maintaining power connection with the lower end of the driven gear shaft (803).

6. The apparatus for testing the drying and wetting cycle of concrete according to claim 5, wherein: The bevel gear reversing transmission structure (806) comprises a driving bevel gear fixed at one end of the surface of the main transmission shaft (701) and a driven bevel gear fixed at the upper end of the vertical shaft (805), the driven bevel gear and the driving bevel gear are engaged, the sprocket transmission structure (804) comprises a main sprocket fixed at the lower end of the vertical shaft (805) and a secondary sprocket fixed at the lower end of the driven gear shaft (803), and a chain is installed between the secondary sprocket and the main sprocket.

7. The apparatus for testing the freeze-thaw cycle of concrete according to claim 5, wherein: The ring column type air blowing drying assembly (6) comprises an I-shaped air duct (601) erected at the top end of the rack (1), arc-shaped air ducts (602) installed on the front and rear outer walls of the I-shaped air duct (601), and an air blower (604) installed at the right side of the top end of the rack (1), a Y-shaped pipe (603) is installed at the outlet end of the air blower (604), one end of the Y-shaped pipe (603) away from the air blower (604) is connected with the arc-shaped air duct (602), the input end of the air blower (604) is electrically connected with the output end of the control panel (9), and the I-shaped air duct (601) and the tray (807) are coaxial.

8. The apparatus for testing the drying and wetting cycle of concrete according to claim 7, wherein: The arc-shaped air duct (602) and the Y-shaped pipe (603) are both made of hard plastic material.

9. The apparatus for testing the freeze-thaw cycle of concrete according to claim 7, wherein: Electric heating rods are installed in the two bypass pipelines of the Y-shaped pipe (603) away from the air blower (604), and the input end of the electric heating rod is electrically connected with the output end of the control panel (9).

10. A method of a dry-wet cycle test of concrete using the apparatus for a dry-wet cycle test of concrete according to any one of claims 1 to 9, characterized by: The method comprises the following steps: S101: Prepare a columnar concrete sample, pass the standard cylindrical concrete sample through the ring column type air blowing drying assembly (6) and stably place it on the sprocket reduction type self-rotating structure (8) at the bottom of the test box (2), ensure that the concrete sample is placed firmly, accurately weigh the sodium chloride and sodium sulfate reagents according to the concentration required by the experimental design, mix the deionized water in the pump liquid assembly one (4) and the pump liquid assembly two (5), then manually start the pump liquid assembly one (4) and the pump liquid assembly two (5) through the control panel (9), and inject the quantitative mixed solution into the test box (2) until the liquid level reaches the preset height. S102: The staff starts the rotation driving assembly (10) and the ring column type air blowing drying assembly (6) through the control panel (9), and the ring column type air blowing drying assembly (6) blows air to the outer wall of the concrete sample and the test box (2), the power of the rotation driving assembly (10) is transmitted to the double-shaking wave making assembly (7) and the chain wheel deceleration type self-rotation structure (8), the double-shaking wave making assembly (7) makes continuous and fluctuating surges in the test box (2) to make dynamic fluid impact on the surface of the sample, and the chain wheel deceleration type self-rotation structure (8) drives the sample to rotate while bearing the surge impact; S103: In the process of the dry-wet cycle test, the control panel (9) judges the signal of the chloride ion electrode (3) monitored in real time: if the ion concentration of the solution in the test box (2) is lower than the set threshold value due to the scouring and adhesion of the sample, the pump liquid assembly one (4) and the pump liquid assembly two (5) are automatically triggered to re-inject the mixed solution to restore and maintain the dynamic stability of the solution concentration; S104: After the dry-wet cycle test is completed, the staff turns off the equipment, the sample is taken out from the test box (2) for detection and analysis of the mechanical properties and microstructure to evaluate the influence of the dry-wet cycle and surge impact on the durability of the concrete.

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