Ion permeation measurement device and method

Abstract

This application provides an ion penetration measuring device and method. The test chamber of the ion penetration measuring device has a accommodating cavity for containing a permeation solution containing permeation ions. A first opening communicating with the accommodating cavity is provided on the side wall of the test chamber. The test specimen is placed on the first opening and is in contact with the permeation solution. A heat exchanger is used to cover the test specimen when it is placed on the first opening and to exchange heat with it. The power supply has a positive electrode and a negative electrode. The positive electrode is inserted into the test specimen, and the negative electrode is placed in the permeation solution to form a current loop and promote the migration of permeation ions into the test specimen. The heat exchanger is used to regulate the temperature of the concrete, thereby simulating the temperature difference environment of concrete structural components such as energy piles, which helps to improve the accuracy of the detection of permeation parameters of the test specimen.

Description

Technical Field

[0001] This application belongs to the field of concrete testing technology, and in particular relates to an ion penetration measuring device and a measuring method. Background Technology

[0002] In the field of construction engineering, the durability of concrete structures has always been a critical issue of great concern, especially in chloride ion corrosive environments, where chloride ion penetration can lead to corrosion of the steel reinforcement inside the concrete, seriously affecting structural safety and service life.

[0003] In related technologies, one end of the energy pile needs to be buried underground, and the temperature of the building is regulated through heat exchange with the underground soil. Energy piles are susceptible to the penetration of substances such as chloride ions, which can affect their structure and function; however, due to the temperature difference between the inside and outside of the energy pile, it is currently difficult to accurately measure the permeation parameters. Summary of the Invention

[0004] The purpose of this application is to provide an ion permeation measurement device and method, aiming to solve the problems of ion permeation measurement devices in traditional technologies.

[0005] The problem.

[0006] A first aspect of this application provides an ion permeation measurement device, the ion permeation measurement device comprising:

[0007] A test chamber has a accommodating cavity for containing a permeation solution containing permeation ions, and a first opening communicating with the accommodating cavity is provided on the side wall of the test chamber. The test specimen is placed on the first opening and is in contact with the permeation solution.

[0008] A heat exchanger is used to cover the test specimen and exchange heat with it when the test specimen is placed in the first opening.

[0009] The power supply has a positive electrode and a negative electrode. The positive electrode is used to be inserted into the test piece, and the negative electrode is used to be placed in the permeation solution to form a current loop and promote the migration of permeation ions into the test piece.

[0010] In some embodiments of this application, the heat exchanger is attached to the side of the test specimen facing away from the permeation solution.

[0011] In some embodiments of this application, the ion permeation measuring device further includes a temperature measuring element, which is inserted into the test piece and used to detect the temperature of the test piece. The heat exchange element adjusts the temperature of the test piece based on the detected temperature of the test piece.

[0012] In some embodiments of this application, the heat exchanger is a semiconductor heating element.

[0013] In some embodiments of this application, the ion permeation measuring device further includes a fixing block with a second opening corresponding to the first opening. The fixing block is used to cover the side of the test chamber with the first opening so that the second opening and the first opening are connected and define an accommodating space for accommodating the test specimen.

[0014] In some embodiments of this application, the ion permeation measuring device further includes a rubber sleeve, which is used to fill the space between the inner wall of the second opening and the test piece to fix the test piece.

[0015] In some embodiments of this application, the ion permeation measuring device further includes a diffusion coefficient measuring instrument, the power supply is disposed within the diffusion coefficient measuring instrument, and the diffusion coefficient measuring instrument is used to measure the voltage and current of the current loop formed by the power supply, the test piece, and the permeation solution.

[0016] In some embodiments of this application, the permeation solution is a sodium chloride solution, the permeation ions are chloride ions, and the test specimen is a concrete block.

[0017] A second aspect of this application also provides a measurement method for an ion permeation measuring device, applied to the ion permeation measuring device as described above, the measurement method comprising:

[0018] The test specimen is fixed on the first opening of the test chamber, and a permeation solution is added into the accommodating cavity of the test chamber until the permeation solution comes into contact with the test specimen;

[0019] Turn on the power and heat exchanger, and remove the test piece after the preset time.

[0020] Cut open the test specimen and spray a colorimetric indicator onto the cut surface of the test specimen to show the penetration area;

[0021] The dimensional parameters of the permeation region are measured to calculate the permeation depth of the permeating ions.

[0022] In some embodiments of this application, the permeating ion is a chloride ion, and the permeation depth is calculated after calculating the permeation depth of the permeating ion;

[0023] The diffusion coefficient of permeated ions is calculated using the following formula:

[0024] D RCM = ;

[0025] Wherein, DRCM is the diffusion coefficient, T is the absolute temperature of the permeation solution, d is the penetration depth of chloride ions, U is the DC voltage applied by the power supply, t is the test duration, and A is the cross-sectional area of ​​the test piece.

[0026] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The ion penetration measuring device and method described above include a test chamber, a heat exchanger, and a power supply; the test chamber has a accommodating cavity for accommodating a permeation solution containing permeation ions, and a first opening communicating with the accommodating cavity is provided on the side wall of the test chamber, on which the test specimen is placed and in contact with the permeation solution; the heat exchanger covers the test specimen when it is placed in the first opening and exchanges heat with it; the power supply has a positive electrode and a negative electrode, the positive electrode being inserted into the test specimen and the negative electrode being placed in the permeation solution to form a current loop and promote the migration of permeation ions into the test specimen; the heat exchanger in this application is used to adjust the temperature of the concrete, thereby simulating the temperature difference environment of concrete structural components such as energy piles, which is beneficial to improving the accuracy of environmental simulation, thereby improving the accuracy of detecting the permeation parameters of the test specimen; and the power supply is also used to accelerate the migration speed of permeation ions, shorten the test time, and provide the required parameters for calculating the permeation ion diffusion coefficient. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an ion permeation measuring device provided in an embodiment of this application;

[0028] Figure 2 Another structural diagram of an ion permeation measuring device provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of an ion permeation measuring device provided in another embodiment of this application;

[0030] Figure 4 This is a schematic diagram illustrating the steps of a measurement method provided in an embodiment of this application.

[0031] Specific element symbols: 100-Test chamber, 110-Permeation solution, 120-First opening, 130-Liquid filling port, 200-Heat exchanger, 300-Power supply, 310-Negative electrode component, 320-Positive electrode component, 400-Test piece, 500-Insulation layer, 600-Temperature measuring component, 700-Fixing block, 710-Second opening. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] It is important to understand that during their service life, concrete structural components are subject to freeze-thaw cycles, carbonation, and ion corrosion, which can compromise their functionality and structural safety. Among these, the impact of chloride ions on concrete is a particularly pressing issue regarding concrete durability. The chloride ion diffusion coefficient is a crucial indicator of concrete permeability and internal steel reinforcement corrosion in chloride-contaminated environments (such as harbor terminals, underground engineering projects, hydraulic structures, and coastal areas).

[0037] Currently, the main methods for determining the chloride ion diffusion coefficient in concrete include natural diffusion, accelerated diffusion under an applied electric field, and pressure osmosis. Among these, the accelerated diffusion under an applied electric field is more widely used due to its short experimental cycle and relatively accurate test results. Through rapid indoor testing, the depth of chloride ion penetration into concrete can be directly measured, and the chloride ion diffusion coefficient of concrete can be derived. It also has the advantages of being fast, direct, and simple, and has been widely adopted internationally.

[0038] Underground energy structures are a new type of energy-saving building structure derived from ground source heat pump technology. The underground structure itself is located at a certain depth in a stratum that maintains a constant temperature year-round. The underground heat exchange pipes of the ground source heat pump system are directly implanted into the underground structure, forming an underground heat exchanger together with the underground engineering structure. It obtains or releases heat from the surrounding strata, saving 30% to 50% more energy than traditional air conditioning and hot water systems. The energy obtained is clean, sustainable, and has significant economic and environmental benefits, solving the two major obstacles to promoting ground source heat pump technology in cities: high land occupation and high cost. Energy piles install the heat exchange circuit of a traditional buried-pipe ground source heat pump within the pile foundation, utilizing the temperature difference between the circulating heat transfer medium inside the pipe and the surrounding soil and rock for heat exchange. Hot water pipes are generally used for water circulation within energy piles, resulting in a certain temperature difference between the inner and outer sides. The chloride ion permeation in concrete structural components under unidirectional temperature transfer may differ, therefore, it is necessary to measure its chloride ion permeation parameters.

[0039] Based on this, this application improves the relevant ion permeation measurement device and measurement method.

[0040] Please see Figure 1 and Figure 2 , Figure 1 A schematic diagram of the ion permeation measurement device provided in this embodiment is shown. Figure 2 Another structural schematic diagram of the ion permeation measurement device provided in this embodiment is shown. The ion permeation measurement device of this application embodiment includes a test chamber 100, a heat exchanger 200, and a power supply 300. The test chamber 100 has a accommodating cavity for accommodating a permeation solution 110 containing permeation ions. A first opening 120 communicating with the accommodating cavity is provided on the side wall of the test chamber 100. The test specimen 400 is placed on the first opening 120 and is in contact with the permeation solution 110. The heat exchanger 200 is used to cover the test specimen 400 when the test specimen 400 is placed on the first opening 120 and to exchange heat with the test specimen 400. The power supply 300 has a positive electrode component 320 and a negative electrode component 310. The positive electrode component 320 is used to be inserted into the test specimen 400, and the negative electrode component 310 is used to place the permeation solution 110 to form a current loop and promote the migration of permeation ions into the test specimen 400.

[0041] It should be explained that, in this embodiment, chloride ions are used as the permeating ion as an example. The test chamber 100 is a component with an internal accommodating cavity, which can be used to accommodate a permeation solution 110 containing chloride ions (such as NaCl solution). Its side wall has a first opening 120 communicating with the accommodating cavity. The concrete specimen to be tested can be fixed to this opening, so that the specimen is in contact with the permeation solution 110. The heat exchanger 200 is a component (such as a Peltier heating plate) covering the specimen 400 to be tested. It is tightly connected to the specimen through thermally conductive silicone and can exchange heat with the specimen to regulate the temperature of the specimen. The power supply 300 is a device with a positive electrode component 320 and a negative electrode component 310. The positive electrode component 320 (such as a titanium mesh pre-embedded in the specimen) is inserted into the specimen 400 to be tested, and the negative electrode component 310 (such as a titanium mesh placed in the solution) is placed in the permeation solution 110. After forming a current loop, an electric field is applied to promote the migration of chloride ions into the specimen. The accommodating cavity is the space within the test chamber 100 used to contain the permeation solution 110, ensuring full contact between the solution and the test specimen 400. The first opening 120 is an opening on the side wall of the test chamber 100 that communicates with the accommodating cavity, used to fix the test specimen 400, so that one side of the specimen is in contact with the permeation solution 110 and the other side is in contact with the heat exchanger 200. The test specimen 400 is a concrete specimen, with a positive electrode component 320 (titanium mesh) pre-embedded during preparation for testing chloride ion permeation performance.

[0042] Understandably, the test chamber 100 is designed with a accommodating cavity to hold the permeation solution 110, and the test specimen 400 is brought into contact with the solution through the first opening 120, ensuring that permeation ions can migrate from the solution to the specimen. The heat exchanger 200 covers the test specimen 400 and exchanges heat with it, which can regulate the specimen temperature and simulate the temperature difference environment of concrete structural components such as energy piles, which helps to improve the accuracy of environmental simulation and thus improve the accuracy of the detection of permeation parameters of the test specimen 400. The positive and negative terminals 310 of the power supply 300 are inserted into the test specimen 400 and the permeation solution 110 respectively to form a current loop, which can accelerate the migration speed of permeation ions, shorten the test time, and provide the necessary parameters for the calculation of the permeation ion diffusion coefficient, which helps to improve test efficiency and data reliability.

[0043] Please refer to the embodiments described in this application. Figure 1 In this embodiment, the heat exchanger 200 is attached to the side of the test piece 400 that is away from the permeation solution 110.

[0044] Understandably, the heat exchanger 200 regulates the temperature on the other side of the test specimen 400 to simulate a unidirectional temperature cycle environment. For example, when the permeation solution 110 side is at room temperature, the heat exchanger 200 can heat or cool the other side of the specimen, creating a temperature gradient from the heat exchanger 200 side to the permeation solution 110 side, simulating the unidirectional temperature transfer scenario caused by internal heat exchange in underground structures such as energy piles. This setup allows chloride ions to migrate into the test specimen 400 under the combined action of the temperature gradient and electric field, more accurately reflecting the chloride ion permeation characteristics of concrete structures under temperature cycling in actual engineering, and providing more reliable test data for evaluating concrete durability.

[0045] In some embodiments of this application, please refer to Figure 3 The ion permeation measurement device also includes a temperature measuring element 600, which is inserted into the test piece 400 and used to detect the temperature of the test piece 400. The heat exchange element 200 adjusts the temperature of the test piece 400 based on the detected temperature of the test piece 400.

[0046] Understandably, by inserting a temperature sensor 600 into the test specimen 400 (such as a thermocouple embedded in the center of the test block), the internal temperature of the test block can be monitored in real time. Based on the temperature data fed back by the temperature sensor 600, the heat exchanger 200 (Peltier heating element) automatically adjusts the heating power or cycle time through a temperature controller and timer to achieve precise temperature control of the test block. For example, when the temperature sensor 600 detects that the test block temperature has not reached the set temperature, the heat exchanger 200 automatically increases the heating power; if the set temperature is exceeded, heating is paused to ensure that the test block temperature strictly meets the test requirements of unidirectional temperature cycling. This setup makes the temperature simulation process closer to the temperature fluctuation patterns in actual service of the energy pile, avoiding errors in chloride ion migration rate caused by temperature control deviations, thereby improving the accuracy of penetration depth measurement and diffusion coefficient calculation. Meanwhile, the linkage adjustment mechanism between the temperature measuring element 600 and the heat exchange element 200 can correct the temperature field distribution in real time, ensuring that the temperature gradient remains stable during the process of accelerated chloride ion migration in the electric field, providing more reliable test data support for studying the durability of concrete under the coupling effect of temperature and electric field.

[0047] In some embodiments, the temperature measuring element 600 includes a thermocouple and a temperature detector, with one end of the thermocouple connected to the temperature detector and the other end extending into the test piece 400.

[0048] In some embodiments of this application, the heat exchanger 200 is a semiconductor heating element.

[0049] It should be explained that the semiconductor heating element, also known as the Peltier heating element, is attached to the side of the test piece 400 away from the permeation solution 110 by thermally conductive silicone. After being energized, it exchanges heat with the test piece based on the Peltier effect, providing unidirectional temperature circulation.

[0050] It is understandable that by using a semiconductor heating element 200 as a heat exchanger, it can be tightly bonded to the test piece 400 through thermally conductive silicone, and precise temperature control can be achieved based on the Peltier effect after power is applied.

[0051] Please refer to the embodiments described in this application. Figure 2 The ion penetration measuring device of this embodiment also includes a fixing block 700, on which a second opening 710 is provided. The second opening 710 corresponds to the first opening 120. The fixing block 700 is used to cover the side of the test chamber 100 where the first opening 120 is provided, so that the second opening 710 and the first opening 120 are connected, and a receiving space for accommodating the test specimen 400 is defined.

[0052] It should be explained that the fixing block 700 is a component covering the side of the test chamber 100 where the first opening 120 is provided, and it has a second opening 710 corresponding to the first opening 120. The two are connected to form a receiving space for accommodating the test piece 400, and are fixedly connected to the test chamber 100 by a slot or bolt.

[0053] Understandably, the squeezing action of the fixing block 700 ensures a tight fit between the test specimen 400 and the test chamber 100, preventing leakage of the permeation solution 110 from the specimen's edges and ensuring that chloride ions migrate unidirectionally only from the permeation surface of the specimen, thus avoiding interference from side leakage on the test results. Simultaneously, the accommodating space defined by the fixing block 700 precisely positions the test specimen 400, maintaining consistent contact between the specimen, heat exchanger 200, and permeation solution 110, improving the repeatability and data comparability of different batches of tests. Furthermore, the structural design of the fixing block 700 enhances the overall sealing of the test apparatus, maintaining a stable environment within the accommodating space during the application of an electric field and temperature cycling, preventing external factors from affecting the chloride ion migration process, thereby improving the accuracy of permeation depth measurement and diffusion coefficient calculation.

[0054] In some embodiments of this application, the ion permeation measuring device further includes a rubber sleeve, which is used to fill the space between the inner wall of the second opening 710 and the test piece to fix the test piece.

[0055] It should be explained that the rubber sleeve is a ring-shaped elastic component that is filled between the inner wall of the second opening 710 of the fixing block 700 and the test piece 400. It fixes the test piece by compression deformation and at the same time plays a role in sealing and preventing leakage.

[0056] Understandably, by filling the space between the inner wall of the second opening 710 and the test specimen 400 with a rubber sleeve, and utilizing its elastic deformation properties to tightly fit the edge of the specimen, the specimen can be stably fixed in the accommodating space formed by the first opening 120 of the test chamber 100 and the second opening 710 of the fixing block 700, preventing displacement of the specimen during the application of an electric field or temperature cycling, and ensuring the stability of the chloride ion permeation path. On the other hand, the sealing effect of the rubber sleeve can prevent the permeation solution 110 from leaking from the gap between the specimen and the opening. Combined with epoxy resin waterproofing treatment, a double sealing structure can be formed to prevent deviation of the chloride ion migration path caused by side leakage, and ensure the consistency between the test environment and the actual engineering scenario.

[0057] In some embodiments, a liquid inlet 130 is provided above the test chamber 100, and the liquid inlet 130 is used to add permeation solution 110 into the accommodating cavity. In some embodiments, a sealing plug is detachably provided on the liquid inlet 130.

[0058] In some embodiments, a heat exchanger 200 is provided with an insulation layer 500 on the side of the heat exchanger 200 facing away from the test specimen 400.

[0059] In some embodiments of this application, please refer to Figure 3 , Figure 3 A schematic diagram of the ion permeation measurement device provided in this embodiment is shown; as follows: Figure 3 As shown, in this embodiment, the diffusion coefficient measuring instrument is an NJ-RCM chloride ion diffusion coefficient measuring instrument, the temperature control system is a heat exchanger 200, the plexiglass test chamber 100 is a test chamber 100, and the temperature testing system is a temperature measuring element 600. The ion permeation measuring device in this embodiment also includes a diffusion coefficient measuring instrument. A power supply 300 is installed inside the diffusion coefficient measuring instrument, which is used to measure the voltage and current of the current loop formed by the power supply 300, the test piece 400, and the permeation solution 110.

[0060] It should be explained that the diffusion coefficient measuring instrument used in this embodiment is the NJ-RCM chloride ion diffusion coefficient measuring instrument, which integrates a power supply module 300. It is connected to the anode titanium mesh in the test piece 400 and the cathode titanium mesh in the permeation solution 110 through the test line to form a closed current loop for real-time measurement of voltage and current parameters in the loop.

[0061] Understandably, when the measuring instrument is powered on, the power supply 300 applies a stable electric field to the concrete specimen through the positive and negative titanium mesh, causing chloride ions to migrate into the specimen under the influence of the electric field force. Simultaneously, the measuring instrument collects voltage and current data in the circuit in real time. This setup, based on the RCM method principle, integrates the power supply 300 with data monitoring, avoiding voltage fluctuations or contact resistance errors caused by external circuit connections. This ensures the stability of the electric field strength and the accuracy of the current data, thus providing reliable parameters for calculating the chloride ion diffusion coefficient. Furthermore, the measuring instrument simultaneously monitors the temperature of the permeation solution 110. Combining this with voltage, current, and subsequent permeation depth data, the diffusion coefficient can be accurately derived using a standard formula. This ensures that the test results closely match the migration patterns of chloride ions under temperature-electric field coupling in actual engineering projects such as energy piles, improving the reliability of concrete durability assessment.

[0062] In some embodiments of this application, the permeation solution 110 is a sodium chloride solution, the permeation ions are chloride ions, and the test specimen 400 is a concrete block.

[0063] Furthermore, to better implement the ion permeation measurement device in any of the above embodiments, please refer to [reference needed] based on the above-described ion permeation measurement device. Figure 4 , Figure 4 The illustration shows a schematic diagram of the steps of the measurement method provided in this embodiment; this application embodiment also provides a measurement method for an ion permeation measurement device, applied to the ion permeation measurement device as described above, the measurement method including:

[0064] S100: Fix the test piece 400 on the first opening 120 of the test chamber 100, and add the permeation solution 110 into the accommodating cavity of the test chamber 100 until the permeation solution 110 contacts the test piece 400; specifically, open the liquid inlet 130 on the top of the test chamber 100 and observe the height of the permeation solution 110 through the glass shell of the test chamber 100.

[0065] S200: Turn on the power supply 300 and the heat exchanger 200, and remove the test piece 400 after a preset time. Specifically, the heat exchanger 200 is used to simulate the temperature environment of the test piece 400, and the power supply 300 is used to output current to accelerate the migration of penetrating ions.

[0066] S300: Cut open the test piece 400 and spray a colorimetric indicator on the cut surface of the test piece 400 to show the penetration area; specifically, use a pressure testing machine to cut open the test piece 400, and after spraying the colorimetric indicator, the area of ​​the penetrating ions will change color, thereby measuring the penetration depth.

[0067] S400: Measures the dimensional parameters of the permeation zone to calculate the penetration depth of permeating ions. Specifically, a micrometer can be used for measurement, improving the accuracy to 0.1 mm.

[0068] In some embodiments of this application, the permeating ion is a chloride ion, and the process further includes calculating the permeation depth of the permeating ion;

[0069] The diffusion coefficient of the permeated ions is calculated using the following formula:

[0070] D RCM = ;

[0071] Wherein, DRCM is the diffusion coefficient, T is the absolute temperature of the permeation solution 110, d is the penetration depth of chloride ions, U is the DC voltage applied by the power supply 300, t is the test duration, and A is the cross-sectional area of ​​the test piece 400.

[0072] In some embodiments, the DC voltage applied by the power supply 300 is 35V. It is understood that using a lower voltage avoids the impact of polarization reactions and excessive temperature rise on the accuracy of resistance measurement. The measurement process is simple and easy to operate, requiring no complex external circuitry. This allows for a more intuitive observation of chloride ion permeability within the energy pile, resulting in accurate test results and high practical value.

[0073] In some embodiments of this application, the test chamber 100 is an acrylic glass test chamber 100, and the length, width, and height of its accommodating cavity are 340mm, 10mm, and 100mm, respectively. The concrete test block (corresponding to the test piece 400) is cut from the middle part of a 100mm cube concrete test block, with dimensions of 100mm in length, 100mm in width, and 50mm in height. During the preparation of the test block, thermocouples (corresponding to temperature measuring element 600) and titanium mesh (corresponding to positive electrode component 320) are embedded in advance. The titanium mesh has a size of 8mm × 8mm, and the embedding position of the titanium mesh in the concrete is 10mm away from the adhesive side of the Peltier heating element (corresponding to heat exchange element 200). The thermocouple is embedded at the center of the concrete test block.

[0074] The temperature monitoring system consists of a TP700 multi-channel data logger, thermocouples, and a 300 power supply. Two thermocouple test ends are embedded during the preparation of the concrete specimen, and the interface ends are connected to the TP700 multi-channel data logger to observe the temperature changes inside the concrete specimen at different times.

[0075] The temperature circulation system consists of a 300W power supply, a Peltier heating element, a temperature controller, and a timer. The outside of the concrete specimen is tightly bonded to the Peltier heating element with thermally conductive silicone. The Peltier heating element provides unidirectional temperature circulation to the concrete specimen through the temperature controller and timer. The temperature and circulation time are set according to the actual engineering application.

[0076] There is a slot inside the test chamber 100, and a silicone rubber sleeve is around the slot. The concrete test block is coated with epoxy resin for waterproofing on the contact surface with the test chamber 100, and then fixed inside the slot of the test chamber 100.

[0077] The NJ-RCM chloride ion diffusion coefficient analyzer mainly consists of the main unit, temperature measuring wire, test wire, fixture, and 300W power supply. The NJ-RCM chloride ion diffusion coefficient analyzer connects to the solution in the acrylic glass test tank via the temperature measuring wire to measure the temperature change of the solution. The cathode of the test wire is connected to a titanium mesh in the NaCl solution, and the anode is connected to a titanium mesh pre-embedded in a concrete test block. After the instrument forms a circuit with the test block and solution, it can measure the voltage and current.

[0078] The measurement procedure is as follows: Adjust the output voltage of the power supply 300 in the diffusion coefficient measuring instrument to 35V. Fix the concrete specimen, cured to the test age, on one side of the test chamber 100. Inject a 10% NaCl solution into the test tank, ensuring the NaCl solution is level with the concrete specimen. Connect the thermocouple wires inside the concrete specimen to the TP700 multi-channel data logger. The NJ-RCM chloride ion diffusion coefficient measuring instrument is connected to the titanium mesh inside the concrete specimen and the titanium mesh inside the NaCl solution via test wires. The end of the temperature measuring wire is immersed in the NaCl solution. A Peltier heating element is bonded to the non-eroded surface of the concrete specimen using thermally conductive silicone. The Peltier is connected in series with the temperature controller, power supply 300, and timer. Simultaneously start the TP700 multi-channel data logger, the Peltier heating element, and the NJ-RCM chloride ion diffusion coefficient measuring instrument. The voltage, current, and solution temperature can be observed on the main display screen of the NJ-RCM chloride ion diffusion coefficient meter. The Peltier heating element heating system is set to 50℃ with a temperature cycle time of 6 hours of heating followed by 6 hours of room temperature. The TP700 multi-channel data logger can observe the temperature changes at multiple locations inside the concrete specimen. After 24 hours, all instruments are turned off and the data is recorded. The concrete specimen is then removed and split in half perpendicular to the penetration surface using a pressure testing machine. A colorimetric indicator (0.1 mol / L AgNO3) is sprayed onto the cut surface. The specimen is placed in a well-lit environment. After 15 minutes, the chloride ion-containing portion turns purple. The colored portion is measured with a micrometer to an accuracy of 0.1 mm to obtain the chloride ion penetration depth, and the chloride ion diffusion coefficient is calculated.

[0079] In some embodiments, the concrete specimen can be vacuum saturated for 24 hours using a saturated Ca(OH)2 solution saturation apparatus the day before the experiment. After saturation, the specimen is removed, dried, and epoxy resin is applied to all four sides around it before it is fixed to one side of the test chamber 100.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0081] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0082] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0083] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0084] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An ion permeation measuring device, characterized in that, The ion permeation measurement device includes: A test chamber has a accommodating cavity for containing a permeation solution containing permeation ions, and a first opening communicating with the accommodating cavity is provided on the side wall of the test chamber. The test specimen is placed on the first opening and is in contact with the permeation solution. A heat exchanger is used to cover the test specimen and exchange heat with it when the test specimen is placed in the first opening. The power supply has a positive electrode component and a negative electrode component. The positive electrode component is used to be inserted into the test piece, and the negative electrode component is used to be placed in the permeation solution to form a current loop and promote the migration of the permeation ions into the test piece. The ion penetration measuring device further includes a fixing block, on which a second opening is provided, the second opening corresponding to the first opening. The fixing block is used to cover the side of the test chamber where the first opening is provided, so that the second opening and the first opening are connected, and to define an accommodating space for accommodating the test specimen. The ion penetration measuring device also includes a rubber sleeve, which is used to fill the space between the inner wall of the second opening and the test piece to fix the test piece. The ion permeation measurement device also includes a diffusion coefficient measuring instrument. The power supply is located inside the diffusion coefficient measuring instrument, which is used to measure the voltage and current of the current loop formed by the power supply, the test piece, and the permeation solution.

2. The ion permeation measuring device according to claim 1, characterized in that, The heat exchanger is attached to the side of the test specimen that is away from the permeation solution.

3. The ion permeation measuring device according to claim 2, characterized in that, The ion penetration measurement device further includes a temperature measuring element, which is inserted into the test piece and used to detect the temperature of the test piece. The heat exchange element adjusts the temperature of the test piece based on the detected temperature of the test piece.

4. The ion permeation measuring device according to claim 3, characterized in that, The heat exchanger is a semiconductor heating element.

5. The ion permeation measuring device according to any one of claims 1 to 4, characterized in that, The permeation solution is a sodium chloride solution, the permeation ions are chloride ions, and the test specimen is a concrete block.

6. A measurement method for an ion permeation measuring device, characterized in that, When applied to the ion permeation measuring device as described in any one of claims 1 to 5, the measuring method includes: The test specimen is fixed on the first opening of the test chamber, and a permeation solution is added into the accommodating cavity of the test chamber until the permeation solution comes into contact with the test specimen; Turn on the power and heat exchanger, and remove the test piece after the preset time. Cut open the test specimen and spray a colorimetric indicator onto the cut surface of the test specimen to show the penetration area; The dimensional parameters of the permeation region are measured to calculate the permeation depth of the permeating ions.

7. The measurement method of the ion permeation measuring device according to claim 6, characterized in that, The permeating ion is chloride ion, and the permeation depth is calculated after calculating the permeation depth of the permeating ion; The diffusion coefficient of the permeated ions is calculated using the following formula: D RCM = ； Wherein, DRCM is the diffusion coefficient, T is the absolute temperature of the permeation solution, d is the penetration depth of chloride ions, U is the DC voltage applied by the power supply, t is the test duration, and A is the cross-sectional area of ​​the test piece.

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