High-voltage electrochemical accelerated corrosion-seepage test system suitable for anti-seepage curtain body

Abstract

The utility model discloses a high-voltage electrochemical accelerated corrosion-seepage test system suitable for an anti-seepage curtain body. The high-voltage electrochemical accelerated corrosion-seepage test system comprises a test chamber, a packaging module and a pressurizing module, wherein the test chamber is used for mounting a test piece and providing a test environment; the packaging module is used for packaging the test chamber through water injection; according to the device, electrochemical corrosion can be carried out in the permeation pressurization and high-temperature process of the test piece, contact corrosion only located on the surface of the test piece is converted into permeation corrosion in the test piece, the corrosion condition of the coupling effect of various factors in the natural state can be restored, the test precision is improved, and the test efficiency is improved. And the corrosion process is greatly accelerated, and the time cost is saved.

Description

Technical Field

[0001] The utility model relates to hydraulic concrete tests, and particularly relates to a high-pressure electrochemical accelerated corrosion-seepage test system suitable for an impervious curtain body. Background Art

[0002] A curtain body refers to a continuous water-blocking curtain formed by grouting slurry into the fissures and pores of rock masses or soil layers, which is used to reduce the seepage flow rate and lower the seepage pressure. Due to the interaction between groundwater and curtain materials, the flow of groundwater may not only cause physical wear (i.e., abrasion), but also trigger chemical reactions: on the one hand, hydration products such as calcium hydroxide in the cement-based curtain body are prone to react with acidic substances in groundwater, resulting in dissolution and loss. This infiltration corrosion gradually accumulates over time, causing changes in the microstructure of the curtain body, an increase in porosity, an increase in permeability, and ultimately weakening the anti-seepage performance of the curtain body; on the other hand, the corrosion of the curtain body is usually more significant in specific areas, such as the bottom and the upstream side, where the head pressure is greater, the seepage velocity is faster, and the corrosion effect is stronger. Therefore, the corrosion rate of the curtain body in the natural environment largely depends on the dissolution rate of calcium ions and the head pressure. In addition, environmental factors such as the temperature of groundwater will also affect the corrosion rate and degree. A certain range of temperature can accelerate the chemical reaction rate, increase the solubility of certain substances, reduce the viscosity and density of water, thereby accelerating the chemical decomposition and dissolution of the curtain body material during the corrosion process.

[0003] Currently, in large-scale engineering construction such as reservoirs, dams, foundation pit projects, underground projects, water conveyance tunnels under high head conditions, and river and sea levees, the phenomenon that the impervious curtain body is eroded and damaged for a long time is widespread. Correctly describing the relationship between the change in the anti-seepage performance of the curtain body and its damage degree is the key link in predicting the durability change of the curtain body, and how to accelerate the corrosion process of the curtain body and simulate the natural corrosion state is the difficulty in the research field of seepage corrosion of the curtain body.

[0004] The indoor experimental study on the accelerated corrosion-seepage of the curtain body plays an irreplaceable role in revealing the mechanism of groundwater seepage-chemical coupling and its evolution mechanism of seepage characteristics under load, establishing and verifying the coupled model of groundwater seepage-chemical reaction-solute transport in the curtain body and the numerical analysis method. At present, scholars at home and abroad have developed a large number of accelerated corrosion-seepage coupling test devices for hydraulic concrete, including high hydraulic gradient-based accelerated corrosion devices, chemical reagent accelerated corrosion experimental methods based on ammonium nitrate solution, electrochemical corrosion accelerated test devices, etc. However, most of the current test devices fail to conduct the corrosion-seepage test of the curtain body under the condition of multi-factor coupling, and the test period is relatively long. Moreover, although electrochemical accelerated corrosion, as a method with relatively high efficiency in accelerating the corrosion process of the curtain body at present, is mostly used in the contact corrosion test under normal pressure and cannot be effectively applied to the permeation corrosion test under high water pressure conditions. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-pressure electrochemical accelerated corrosion-seepage test system applicable to the anti-seepage curtain body, which can realize electrochemical corrosion during the process of permeation pressurization and high temperature of the test piece, convert the contact corrosion only on the surface of the test piece into permeation corrosion inside the test piece, not only restore the erosion situation under the coupling of multiple factors in the natural state, improve the test accuracy, but also greatly accelerate the corrosion process and save the time cost.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A high-voltage electrochemical accelerated corrosion-seepage test system applicable to an anti-seepage curtain body, comprising a test chamber for installing a specimen and providing a test environment, a packaging module for encapsulating the test chamber by injecting water, and a pressurizing module for applying osmotic pressure to the test chamber; a specimen installation position is provided in the middle inside the test chamber, and after the specimen is installed, the test chamber can be divided into a cathode chamber and an anode chamber. Insulation layers are provided on the inner walls of the cathode chamber and the anode chamber, and the open ends are closed by respective airtight covers in cooperation with insulating parts. Temperature sensors, electrodes and ceramic heating elements are installed inside the cathode chamber and the anode chamber respectively. Safety valves and water injection ports are provided at the upper parts of the cathode chamber and the anode chamber respectively, and water outlet ports are provided at the lower parts respectively. The safety valves of the cathode chamber and the anode chamber are respectively connected to respective waste gas containers through pipelines with valves. The water injection ports of the cathode chamber and the anode chamber can be selectively closed or externally connected. The water outlet ports of the cathode chamber and the anode chamber are respectively connected to respective reaction liquid containers through pipelines with valves. A pressure sensor is installed inside the cathode chamber; the packaging module includes a water pump, the inlet end of the water pump is connected to a deionized water container through a pipeline with a valve, and the outlet end is respectively connected to the water injection ports of the cathode chamber and the anode chamber through pipelines with valves; the pressurizing module includes a pressure transmission device and a high-precision hydraulic pump. The pressure transmission device includes a hydraulic chamber with openings at both ends and a ceramic piston slidingly fitted therein without coming out. The inlet end of the high-precision hydraulic pump is connected to a hydraulic oil tank through a pipeline with a valve, and the outlet end is connected to one end of the hydraulic chamber through a pipeline with a pressure sensor. The hydraulic oil tank is used to store non-conductive hydraulic oil, and the other end of the hydraulic chamber is directly connected to the cathode chamber through a pipeline.

[0008] Preferably, the test chamber is made of stainless steel high-pressure resistant material, the inner wall insulation layers of the cathode chamber and the anode chamber are both made of silicone rubber pads, and the ends of the cathode chamber and the anode chamber are closed by respective airtight covers in cooperation with epoxy resin.

[0009] Preferably, a recovery oil tank is bypass-connected through a pipeline with a safety piece between the inlet end of the high-precision hydraulic pump and the valve.

[0010] Preferably, the airtight covers of the cathode chamber and the anode chamber are both installed and fixed by fastening bolts.

[0011] Preferably, the test chamber is in a horizontally placed cylindrical shape and is supported by being elevated by a bracket.

[0012] Preferably, the cathode chamber temperature sensor and the anode chamber temperature sensor are pressure thermometers.

[0013] The beneficial effects of the present utility model are:

[0014] The utility model can realize electrochemical corrosion during the process of applying osmotic pressure and high temperature to the test piece, convert the contact corrosion only on the surface of the test piece into osmotic corrosion inside the test piece, which can not only restore the erosion situation under the coupling action of various factors in the natural state, improve the test accuracy, but also greatly accelerate the corrosion process and save time cost. Specifically, the corrosion process is accelerated in three aspects: First, electrochemical acceleration corrosion is adopted, and calcium ions move faster in the pore solution under the action of electromotive force; Second, the reaction is carried out at a higher constant temperature, making the reaction rate faster and increasing the solubility of substances such as calcium ions in the aqueous solution; Third, only osmotic pressure is applied in the cathode chamber. During the reaction process, calcium ions will continuously move towards the cathode, and the side closest to the cathode will start the corrosion process first. Therefore, only applying osmotic pressure in the cathode chamber can expand the contact corrosion occurring on the surface of the test piece into osmotic corrosion and accelerate the corrosion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of a high-pressure electrochemical accelerated corrosion-seepage test system applicable to an anti-seepage curtain body in Embodiment 1 of the utility model.

[0017] Figure 2 is Figure 1 the front view of the test chamber in

[0018] Figure 3 is Figure 1 the side view of the test chamber in

[0019] Figure 4 is Figure 1 the top view of the test chamber in

[0020] Figure 5 It is a schematic diagram of a high-pressure electrochemical accelerated corrosion-seepage test system applicable to an anti-seepage curtain body in Embodiment 2 of the utility model.

[0021] In the figure: 1 - deionized water container; 2 - hydraulic oil tank; 3 - first hydraulic valve; 4 - second hydraulic valve; 5 - safety piece; 6 - high-precision hydraulic pump; 7 - pressure sensor; 8 - water pump; 9 - pressure transmission device; 10 - third hydraulic valve; 11 - fastening bolt; 12 - cathode chamber airtight cover; 13 - cathode chamber temperature sensor; 14 - cathode chamber safety valve; 15 - anode chamber safety valve; 16 - cathode chamber electrode; 17 - cathode chamber ceramic heating element; 18 - test specimen; 19 - anode chamber ceramic heating element; 20 - anode chamber electrode; 21 - fourth hydraulic valve; 22 - positive chamber airtight cover; 23 - anode chamber waste gas container; 24 - cathode chamber waste gas container; 25 - fifth hydraulic valve; 26 - anode chamber reaction liquid container; 27 - sixth hydraulic valve; 28 - cathode chamber reaction liquid container; 29 - power supply and numerical control module; 30 - upper computer; 31 - anode chamber temperature sensor; 32 - bracket; 33 - ceramic piston; 34 - cathode chamber water injection port; 35 - anode chamber water injection port; 36 - cathode chamber water outlet; 37 - anode chamber water outlet; 38 - cathode chamber pressure sensor; 39 - seventh hydraulic valve; 40 - eighth hydraulic valve; 41 - test chamber. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Generally, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0024] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0026] The features and performance of the present application will be further described in detail below in conjunction with the embodiments.

[0027] Embodiment 1

[0028] The existing electrochemical corrosion method only stays at the surface contact corrosion of the test piece 18. Often, the corrosion depth is only a few millimeters in two months, and the corrosion speed is slow. Moreover, the existing electrochemical corrosion method cannot restore the erosion situation under the coupling action of multiple factors in the natural state. To address the above problems, this embodiment provides a high-pressure electrochemical accelerated corrosion-seepage test system applicable to an anti-seepage curtain body, as Figures 1 to 4 shown, including a test chamber 41 for installing the test piece 18 and providing a test environment, a packaging module for encapsulating the test chamber 41 by injecting water, and a pressurizing module for applying an osmotic pressure to the test chamber 41; wherein:

[0029] As Figures 1 to 4 shown, an installation position for the test piece is provided in the middle inside the test chamber 41. After the test piece 18 is installed, the test chamber 41 can be divided into a cathode chamber and an anode chamber. Insulation layers are provided on the inner walls of the cathode chamber and the anode chamber, and the open ends are closed through their respective airtight covers (12, 22) in cooperation with insulating parts. Temperature sensors (13, 31), electrodes (16, 20), and ceramic heating elements (17, 19) are installed inside the cathode chamber and the anode chamber respectively. Safety valves (14, 15) and water injection ports (34, 35) are provided at the upper parts of the cathode chamber and the anode chamber respectively, and water outlets (36, 37) are provided at the lower parts. The safety valves (14, 15) of the cathode chamber and the anode chamber are respectively connected to their respective waste gas containers (24, 23) through pipelines with valves (the seventh hydraulic valve 39, the eighth hydraulic valve 40). The water injection ports (34, 35) of the cathode chamber and the anode chamber can be selectively closed or externally connected. The water outlets (36, 37) of the cathode chamber and the anode chamber are respectively connected to their respective reaction liquid containers (28, 26) through pipelines with valves (the sixth hydraulic valve 27, the fifth hydraulic valve 25). A pressure sensor 38 is installed inside the cathode chamber;

[0030] As Figure 1As shown, the encapsulation module includes a water pump 8 and a deionized water container 1. The inlet end of the water pump 8 is connected to the deionized water container 1 through a pipeline with a valve (the second hydraulic valve 4), and the outlet end is respectively connected to the water injection ports (34, 35) of the cathode chamber and the anode chamber through pipelines with valves (the third hydraulic valve 10, the fourth hydraulic valve 21).

[0031] As Figure 1 and Figure 4 As shown, the pressurization module includes a pressure transmission device 9, a high-precision hydraulic pump 6 and a hydraulic oil tank 2. The pressure transmission device 9 includes a hydraulic chamber with both ends open and a ceramic piston 33 slidably fitted therein without coming out. The inlet end of the high-precision hydraulic pump 6 is connected to the hydraulic oil tank 2 through a pipeline with a valve (the first hydraulic valve 3), and the outlet end is connected to one end of the hydraulic chamber through a pipeline with a pressure sensor 7. The hydraulic oil tank 2 is used to store non-conductive hydraulic oil, and the other end of the hydraulic chamber is directly connected to the cathode chamber through a pipeline.

[0032] Regarding the sealing of the test chamber 41, in this embodiment, preferably: the test chamber 41 is made of stainless steel high-pressure resistant material, the inner wall insulating layers of the cathode chamber and the anode chamber are both made of silicone rubber pads, and the ends of the cathode chamber and the anode chamber are closed by their respective airtight covers (12, 22) in cooperation with epoxy resin.

[0033] To improve the safety during pressurization of the pressurization module, in this embodiment, preferably: as Figure 1 shown, a recovery oil tank is bypass-connected through a pipeline with a safety piece 5 between the inlet end of the high-precision hydraulic pump 6 and the valve (the first hydraulic valve 3).

[0034] As Figure 1 shown, in this embodiment, preferably, the airtight covers (12, 22) of the cathode chamber and the anode chamber are both installed and fixed by fastening bolts 11, which is convenient for loading and unloading. As Figures 1 to 4 shown, in this embodiment, preferably, the test chamber 41 is in a horizontally placed cylindrical shape and is supported by a bracket 32, which is convenient for manufacturing and installation. In this embodiment, preferably, the cathode chamber temperature sensor 13 and the anode chamber temperature sensor 31 adopt pressure thermometers, which are suitable for airtight high-pressure containers and have high precision.

[0035] Embodiment 2

[0036] This embodiment provides another high-pressure electrochemical accelerated corrosion-seepage test system applicable to an anti-seepage curtain body. As Figure 5As shown in the figure, the main difference from the first embodiment is that a power supply and a numerical control module 29 and a host computer 30 are added. Among them: the cathode chamber temperature sensor 13, the cathode chamber electrode 16, the cathode chamber ceramic heating element 17, the cathode chamber pressure sensor 38, the anode chamber temperature sensor 31, the anode chamber electrode 20, the anode chamber ceramic heating element 19, the pressure sensor 7 between the high-precision hydraulic pump 6 and the hydraulic chamber, and the high-precision hydraulic pump 6 are respectively electrically connected to the power supply and the numerical control module 29, and the power supply and the numerical control module 29 are electrically connected to the host computer 30; the power supply and the numerical control module 29 are used to provide power for each detection component and each execution component and control the actions of each execution component according to the instructions of the host computer 30; the host computer 30 can control each execution component through the power supply and the numerical control module 29 according to the input setting information and the feedback information of each detection component to obtain the required test temperature and test osmotic pressure, and can automatically calculate and draw the corrosion rate change curve and the penetration characteristic change curve under the influence of different current voltages, temperatures, and osmotic pressures. In this embodiment, by adding the power supply and the numerical control module 29 and the host computer 30, automatic temperature control and pressure control of the test can be realized, and the test results can be displayed quickly and intuitively.

[0037] Embodiment III

[0038] This embodiment provides a high-pressure electrochemical accelerated corrosion-seepage test method applicable to an anti-seepage curtain body. Based on the high-pressure electrochemical accelerated corrosion-seepage test system applicable to the anti-seepage curtain body in the above-mentioned first or second embodiment, it includes the following steps:

[0039] Step S1, process the test piece 18

[0040] After the test piece 18 is cured in a room temperature environment (the curing time is generally as long as one month), first measure the current resistivity of the test piece 18, and then conduct a vacuum saturation test and measure the resistivity of the test piece 18 after vacuum saturation.

[0041] The process of the vacuum saturation test is as follows: First, place the test piece 18 in a container that can be evacuated, then start the vacuum pump, reduce the air pressure in the container to 1-5 kPa and maintain it for a period of time (such as 3 hours), then, with the vacuum pump still working, inject distilled water or deionized water into the container until the test piece 18 is completely immersed and maintained for a period of time (such as 1 hour), then restore to normal pressure and continue to soak for a period of time (such as 18±2 hours), and finally take out the test piece 18 and measure the resistivity of the test piece 18 after vacuum saturation.

[0042] In this embodiment, the test piece is a standard cylindrical anti-seepage curtain body test piece with a diameter of Φ100mm×20mm, and the entire system is adapted to it. Of course, other types of hydraulic concrete test pieces can also be used for the test.

[0043] Step S2, encapsulate the test piece 18

[0044] First, open the airtight covers (12, 22) of the cathode chamber and the anode chamber. Then, install the test piece 18 at the test piece installation position in the middle inside the test chamber 41, and perform insulation and water isolation between the test piece 18 and the test chamber 41 (for example, apply silicone rubber at the gaps), so that the test piece 18 divides the test chamber 41 into a cathode chamber and an anode chamber, and the solutions in the cathode chamber and the anode chamber can only form a circuit through the test piece 18 after being electrified. Then, close the airtight covers (12, 22) of the cathode chamber and the anode chamber;

[0045] Then, turn on the water pump 8 and the corresponding valves (the second hydraulic valve 4 and the third hydraulic valve 10 are opened, and the fourth hydraulic valve 21, the fifth hydraulic valve 25, and the sixth hydraulic valve 27 are closed), so that the water pump 8 injects the extracted deionized water into the cathode chamber until the cathode chamber and one side of the hydraulic cavity are filled with deionized water and the ceramic piston 33 moves to the end close to the high-precision hydraulic pump 6. Then, turn off the water pump 8 to stop the water injection and let it stand for a period of time (for example, 30 minutes);

[0046] Then, observe whether there is water leakage in the anode chamber. After determining that its seal is intact, first close the corresponding valve (the third hydraulic valve 10) of the water injection port 34 of the cathode chamber, then close the water injection port 34 of the cathode chamber, and then turn on the water pump 8 and the corresponding valves (the second hydraulic valve 4 and the fourth hydraulic valve 21 are opened, and the third hydraulic valve 10, the fifth hydraulic valve 25, and the sixth hydraulic valve 27 are closed), so that the water pump 8 injects the extracted deionized water into the anode chamber until the anode chamber is filled with deionized water. Then, turn off the water pump 8 and the corresponding valves (the second hydraulic valve 4 and the fourth hydraulic valve 21 are closed), and then close the water injection port 35 of the anode chamber. The test piece 18 in the test chamber 41 is in a sealed state.

[0047] Step S3: Osmotic corrosion of the test piece 18

[0048] Turn on the ceramic heating elements (17, 19) of the cathode chamber and the anode chamber, and under the feedback of the temperature sensors (13, 31) in the cathode chamber and the anode chamber, heat the cathode chamber and the anode chamber to the required test temperature and maintain it;

[0049] Turn on the high-precision hydraulic pump 6 and the corresponding valves (the first hydraulic valve 3, the seventh hydraulic valve 39, and the eighth hydraulic valve 40 are opened), so that the high-precision hydraulic pump 6 pushes the extracted hydraulic oil into the hydraulic cavity to apply pressure to the ceramic piston 33, and the ceramic piston 33 pushes the deionized water into the cathode chamber to pressurize the cathode chamber. Under the feedback of the pressure sensor 7 between the high-precision hydraulic pump 6 and the hydraulic cavity and the pressure sensor 38 on the cathode chamber, pressurize the cathode chamber to the required test osmotic pressure and maintain it;

[0050] The electrodes (16, 20) of the cathode chamber and the anode chamber are turned on, and the current forms a circuit through the anode chamber electrode 20, the test piece 18, and the cathode chamber electrode 16. At the test temperature and the test osmotic pressure, the electrochemical dissolution of the test piece 18 changes from contact dissolution to osmotic dissolution, the dissolution rate is greatly increased, and an electrolytic water reaction occurs. The cathode chamber and the anode chamber produce hydrogen and oxygen respectively. If the internal pressure of the cathode chamber rises to the critical pressure of the cathode chamber safety valve 14, the cathode chamber safety valve 14 automatically opens to restore below the critical pressure and discharges hydrogen to the cathode chamber exhaust gas container 24. If the internal pressure of the anode chamber rises to the critical pressure of the anode chamber safety valve 15, the anode chamber safety valve 15 automatically opens to restore below the critical pressure and discharges oxygen to the anode chamber exhaust gas container 23.

[0051] In this step, the test temperature is below 80°C, the test osmotic pressure is within 2MPa (determined according to the test piece material), the anode chamber electrode 20 and the cathode chamber electrode 16 operate in a constant voltage or constant current mode (as the dissolution reaction continues, the test piece resistance will continue to decrease, so a constant voltage or constant current mode is adopted), and the critical pressure of the cathode chamber safety valve 14 and the anode chamber safety valve 15 is set to 100.1% of the test osmotic pressure.

[0052] Step S4: Replace the reaction solution and infiltrate and dissolve the test piece 18

[0053] After the solution in the test chamber reacts for a certain period of time (the reaction time of the solution is determined according to parameters such as voltage, pressure, and temperature, and the solution is generally replaced every 10 days), the output pressure of the high-precision hydraulic pump 6 is slowly reduced until the value of the pressure sensor 7 between the high-precision hydraulic pump 6 and the hydraulic chamber drops to the indoor atmospheric pressure and the ceramic piston 33 is reset, and then the high-precision hydraulic pump 6 and the corresponding valves (the first hydraulic valve 3, the seventh hydraulic valve 39, and the eighth hydraulic valve 40 are closed), and then after the value of the cathode chamber pressure sensor 38 is not higher than the indoor atmospheric pressure, the corresponding valves (the fifth hydraulic valve 25 and the sixth hydraulic valve 27) are opened, so that the cathode chamber reaction liquid container 28 and the anode chamber reaction liquid container 26 collect the cathode chamber reaction solution and the anode chamber reaction solution respectively, and then the volume, ion concentration, and precipitate composition of the reaction solution collected by the cathode chamber reaction liquid container 28 and the anode chamber reaction liquid container 26 are measured, and the molar mass of the gas collected by the cathode chamber exhaust gas container 24 and the anode chamber exhaust gas container 23 are measured and calculated, and the mass of water participating in the water electrolysis reaction is inferred;

[0054] Then, the water pump 8, the cathode chamber water injection port 34, the anode chamber water injection port 35 and the corresponding valves (the second hydraulic valve 4, the third hydraulic valve 10 and the fourth hydraulic valve 21 are opened) are turned on, so that the water pump 8 injects the extracted deionized water into and cleans the cathode chamber and the anode chamber, and after rinsing, the corresponding valves are closed (the fifth hydraulic valve 25 and the sixth hydraulic valve 27 are closed);

[0055] Then, water is injected into the cathode chamber and the anode chamber in the manner of step S2, so that the specimen 18 in the test chamber 41 is in a sealed state;

[0056] Then, the specimen 18 is infiltrated and corroded in the manner of step S3.

[0057] Step S5: Remove the specimen

[0058] Repeat step S4. After replacing the reaction solution and infiltrating and corroding the specimen 18 multiple times, first drain the reaction solution in the cathode chamber and the anode chamber, then open the airtight covers (12, 22) of the cathode chamber and the anode chamber, and then remove the specimen 18.

[0059] As can be seen from the above solution:

[0060] The utility model can realize electrochemical corrosion during the process of infiltrating and pressurizing the specimen 18 at high temperature, convert the contact corrosion only on the surface of the specimen 18 into infiltrating corrosion of the interior of the specimen 18, which can not only restore the erosion situation under the coupling action of multiple factors in the natural state, improve the test accuracy, but also greatly accelerate the corrosion process and save time costs. Specifically, the corrosion process is accelerated in three aspects: First, electrochemical acceleration corrosion is adopted, and calcium ions move faster in the pore solution under the action of electromotive force; Second, the reaction is carried out at a relatively high constant temperature, so that the reaction rate is faster and the solubility of substances such as calcium ions in the aqueous solution is increased; Third, only osmotic pressure is applied in the cathode chamber. During the reaction process, calcium ions will continuously move towards the cathode, and the side closest to the cathode will start the corrosion process first. Therefore, only applying osmotic pressure in the cathode chamber can expand the contact corrosion occurring on the surface of the specimen 18 into infiltrating corrosion and accelerate the corrosion process.

[0061] The difficulty of the utility model is how to combine high hydraulic gradient corrosion and electrochemical corrosion. Because traditional high hydraulic gradient corrosion requires a hydraulic pump to inject water to directly apply osmotic pressure to the specimen, and traditional electrochemical corrosion requires an anode - specimen - cathode circuit to be energized. If the hydraulic pump is used to inject water and apply pressure, directly energizing during this process will damage the instrument and equipment, and there may also be leakage safety accidents. To solve the above difficulties, the present application adopts the following solution: A high-precision hydraulic pump 6 is used to extract hydraulic oil to press the ceramic piston 33, and the ceramic piston 33 pressurizes the cathode chamber through deionized water, that is, the isotropic pressure of the closed liquid is used to apply osmotic pressure to the cathode chamber. Both the hydraulic oil and the ceramic piston 33 are non-conductive, and the inner walls and open ends of the cathode chamber and the anode chamber are insulated, ensuring that there will be no leakage or short circuit after energization, making it possible to carry out electrochemical corrosion during the process of infiltrating and pressurizing the specimen 18; The cathode chamber ceramic heating element 17 and the anode chamber ceramic heating element 19 are used for heating. The ceramic heating element has good insulation and heating performance, and can maintain a constant temperature state for a long time and continuously heat while insulating.

[0062] When electrochemically corroding the test piece during the processes of osmotic pressurization and high temperature, electrolytic water reactions will occur in the cathode chamber and the anode chamber, generating gases, which will increase the pressure in a closed environment. When the pressure is too high, the safety valves (14, 15) of the cathode chamber and the anode chamber are used to discharge the gases, without discharging the solution, which not only ensures that the reaction proceeds under a constant pressure state but also ensures the test safety.

[0063] The utility model is applicable to the anti-seepage curtain body and other types of hydraulic concrete test pieces, and can study the osmotic corrosion mechanism and seepage-chemical coupling effect under natural conditions.

[0064] The embodiments described above are some, but not all, of the embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

Claims

1. A high-voltage electrochemical accelerated dissolution-seepage test system suitable for anti-seepage curtain bodies, characterized in that: It includes a test cabin for installing test specimens and providing a test environment, a packaging module for packaging the test cabin by water injection, and a pressurizing module for applying osmotic pressure to the test cabin; a test specimen installation position is provided in the middle of the test cabin, and the test cabin can be separated into a cathode chamber and an anode chamber after the test specimen is installed. The inner walls of the cathode chamber and the anode chamber are both provided with insulating layers, and the open ends are closed by respective airtight covers and insulating parts. Respective temperature sensors, electrodes and ceramic heating elements are installed in the cathode chamber and the anode chamber. Respective safety valves and water injection ports are provided at the upper part of the cathode chamber and the anode chamber, and respective water outlets are provided at the lower part. The safety valves of the cathode chamber and the anode chamber are respectively connected to respective exhaust gas containers through pipelines with valves. The water injection ports of the cathode chamber and the anode chamber can be selected to be closed or externally connected. The water outlets of the cathode chamber and the anode chamber are respectively connected to their respective reaction liquid containers through pipelines with valves, and a pressure sensor is installed inside the cathode chamber; the packaging module includes a water pump, the inlet end of the water pump is connected to the deionized water container through a pipeline with a valve, and the outlet end is connected to the water injection ports of the cathode chamber and the anode chamber through pipelines with valves; the pressurizing module includes a pressure transmission device and a high-precision hydraulic pump, the pressure transmission device includes a hydraulic cavity, both ends of the hydraulic cavity are open, and a ceramic piston is slidably matched in the middle without falling out, the inlet end of the high-precision hydraulic pump is connected to the hydraulic oil tank through a pipeline with a valve, and the outlet end is connected to one end of the hydraulic cavity through a pipeline with a pressure sensor, the hydraulic oil tank is used to store non-conductive hydraulic oil, and the other end of the hydraulic cavity is directly connected to the cathode chamber through a pipeline.

2. The high-voltage electrochemical accelerated dissolution-seepage test system for an anti-seepage curtain body according to claim 1, characterized in that: The test cabin is made of stainless steel resistant to high pressure. The inner wall insulation layers of the cathode chamber and the anode chamber are made of silicone rubber pads. The ends of the cathode chamber and the anode chamber are sealed with their own airtight covers and epoxy resin.

3. The high-voltage electrochemical accelerated dissolution-seepage test system for an anti-seepage curtain body according to claim 1, characterized in that: The inlet end of the high-precision hydraulic pump and the valve are connected to the recovery tank through a pipeline with a safety piece.

4. The high-voltage electrochemical accelerated dissolution-seepage test system for an anti-seepage curtain body according to claim 1, characterized in that: The airtight covers of the cathode chamber and the anode chamber are both installed and fixed by tightening bolts.

5. The high-voltage electrochemical accelerated corrosion-seepage test system for an anti-seepage curtain body according to claim 1, characterized in that: The test chamber is in the shape of a horizontal cylinder, elevated and supported by a bracket.

6. The high-voltage electrochemical accelerated dissolution-seepage test system for an anti-seepage curtain body according to claim 1, characterized in that: The cathode chamber temperature sensor and the anode chamber temperature sensor are pressure thermometers.

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