System and method for accelerating carbonization or mineralization of cement base material by electrifying

Abstract

The invention discloses a system and a method for accelerating carbonization or mineralization of a cement base material through energization, the system utilizes a carbon dioxide pressure detector to reflect a carbon dioxide pressure value in real time, and the carbon dioxide concentration is supplemented and adjusted in time by controlling the opening and closing states of a valve, so that the stability of the required carbonate ion concentration during the operation of the device and the system is maintained; therefore, the CO2 concentration and pressure in the whole device can be controlled; according to the system, carbonate ions are directionally migrated by utilizing an electromigration method, quickly enter a cement-based test piece and chemically react with alkaline components such as calcium hydroxide and hydrated calcium silicate in the test piece to generate a compact substance, so that carbonization is accelerated. According to the system, carbonate ions are migrated into a test piece with a certain water content and can directly react with alkaline components such as calcium hydroxide and hydrated calcium silicate, no special requirements on various test conditions exist, and the whole operation process is simpler and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of cement-based material detection, in particular to a system and method for accelerating carbonization or mineralization of a cement substrate by electrification. Background Art

[0002] Carbonation of concrete is a kind of chemical corrosion of concrete. The current method is to penetrate carbon dioxide gas into the concrete through the pores of hardened concrete and react with alkaline substances (Ca(OH) 2 ) undergoes a chemical reaction to form carbonate (CaCO 3 ) and water, reducing the alkalinity of concrete. Carbonation mainly occurs through the above reaction to generate dense carbonized products, improve the physical properties of recycled aggregate in concrete, and thus improve the working performance of recycled aggregate concrete. The reduction of alkalinity will lead to changes in pH value; this process starts from the surface of concrete and gradually deepens over time.

[0003] However, the existing methods for testing the carbonization effect of cement-based specimens are still limited to breaking the specimens and then using pH test liquid to perform pH measurement to indirectly determine the carbonization effect of cement-based specimens. The operation is very inconvenient and the measurement results are not accurate enough.

[0004] At present, the existing technology generally uses gaseous or liquid carbon dioxide to carbonize the specimen directly. Its essence is still that carbon dioxide dissolves in water to generate carbonic acid to obtain carbonate ions, and reacts in the form of carbonate ions. For the existing technology, in order to allow a sufficient amount of carbon dioxide to enter the interior of the cement-based specimen and complete a chemical reaction with its alkaline components, this process has extremely strict requirements on temperature, humidity, specimen moisture content, specimen size, etc., and the optimal test conditions are not clear, the carbonization effect is poor, and it takes a long time.

[0005] The conventional method is to use gaseous CO 2 Carbonization and mineralization of cement-based materials are usually carried out by increasing the gaseous CO 2 The concentration is appropriately accelerated; a small part uses other phases (such as liquid, etc.) 2 Accelerate carbonization or mineralization of cement matrix; gaseous CO 2 The carbonization efficiency is low and the reaction time is long, which greatly reduces the carbonization rate of the cement matrix; liquid CO 2 The presence of CO 2 Potential risk of phase instability, which makes the carbonization reaction difficult to stably control;

[0006] Therefore, a more efficient carbonization or mineralization system and method is needed. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a system and method for accelerating carbonization or mineralization of cement substrates by applying electricity, which method utilizes electricity to accelerate the migration of carbonate ions to quickly realize the carbonization detection process of cement substrate specimens.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The cement substrate electrification accelerated carbonization or mineralization system provided by the present invention comprises a test bench, characterized in that: the test bench is provided with a carbonate ion generation unit, a specimen slot, an electric field acceleration unit, and a carbonization or mineralization state detection unit;

[0010] The carbonate ion generating unit is used to generate carbonate ions required for the carbonization reaction in the test piece;

[0011] The test piece slot is used to place the test piece;

[0012] The electric field acceleration unit is arranged on both sides of the test piece slot, and is used to apply a voltage for accelerating the migration of carbonate ions to the test piece;

[0013] The carbonization or mineralization state detection unit is used to determine the carbonization degree of the test piece by detecting the concentration of carbonate ions passing through the test piece.

[0014] Further, the carbonate ion generating unit comprises a solution tank, a gas delivery device, and a measuring device;

[0015] The lower part of the solution tank is configured as a solution part for accommodating a saturated sodium hydroxide solution, the upper part of the solution tank is a gas part for accommodating carbon dioxide gas, the measuring device is arranged in the solution part for measuring the carbonate ion concentration in the solution; the gas delivery device is used to deliver carbon dioxide gas to the gas part in the solution tank.

[0016] Furthermore, the gas delivery device includes a carbon dioxide delivery pipeline, a valve, and a carbon dioxide pressure detector; the carbon dioxide delivery pipeline is used to deliver carbon dioxide gas to the test bench; the valve is arranged on the carbon dioxide delivery pipeline to control the on-off state of the carbon dioxide gas delivery; the carbon dioxide pressure detector is arranged in the gas part to detect the carbon dioxide gas pressure.

[0017] Furthermore, the carbonate ion generating unit further comprises a carbon dioxide intake control unit, which is used to determine the on / off state of the valve according to the carbon dioxide pressure so as to be suitable for conveying carbon dioxide gas into the solution tank.

[0018] Furthermore, it also includes a display device, which includes a display screen and a processing and analysis unit; the carbon dioxide pressure detector and the measuring device are respectively connected to the processing and analysis unit; the display screen is used to output the detection result data of the carbon dioxide pressure detector; and is used to output the detection result of the measuring device on the carbonate ion concentration in the solution portion;

[0019] Further, the electric field acceleration unit includes an anode plate, a cathode plate, and a power supply; the anode plate and the cathode plate are respectively connected to the power supply, and the anode plate and the cathode plate are respectively arranged on both sides of the test piece, and the electric field formed by the anode plate and the cathode plate is used to accelerate the migration of carbonate ions in the solution into the test piece;

[0020] Furthermore, the carbonization state detection unit comprises a deionized water tank, one side of which is used to set the test piece and receive carbonate ions passing through the test piece; and a detector for detecting the carbonate ion concentration is arranged in the deionized water tank.

[0021] The carbonization or mineralization method provided by the present invention using the above-mentioned cement substrate electrification accelerated carbonization or mineralization system comprises the following steps:

[0022] S1: placing the test object, i.e., the cement-based specimen, between the electrode plates;

[0023] S2: Open the valve to allow carbon dioxide to enter area 1 and fill area 2, and form a stable pressure in area 2; after obtaining a mixed solution of sodium hydroxide and sodium carbonate, close the valve;

[0024] S3: Turn on the power supply, and the electric field between the electrode plates accelerates the carbonate ions to move in a directional manner and react with the alkaline components inside the specimen;

[0025] S4: Monitor the carbon dioxide pressure in area 2 and the sodium carbonate concentration in area 3 through the monitoring instrument; and display the concentration change graph on the display screen; determine the degree of carbonization or mineralization completion.

[0026] Further, after turning on the power in step S3, the carbonization treatment is performed according to the following steps, and the specific steps are as follows:

[0027] Excessive sodium hydroxide crystals are placed in area 1 to maintain the concentration of sodium hydroxide solution in area 1;

[0028] By inputting gaseous carbon dioxide into area two to react with sodium hydroxide to generate new sodium carbonate, the entire area one is in a state of mixing sodium hydroxide and sodium carbonate.

[0029] Further, after turning on the power in step S3, mineralization treatment is performed according to the following steps, and the specific steps are as follows:

[0030] By monitoring the concentration of carbonate ions in area three and displaying its change over time on the terminal display screen, when the graph shows a linear growth trend, it can be determined that the cement-based specimen has completed mineralization;

[0031] By controlling the running time through the regional tricarbonate ion concentration graph on the terminal display screen, specimens with different carbonization degrees can be obtained.

[0032] The beneficial effects of the present invention are:

[0033] The present invention provides a system and method for accelerating carbonization or mineralization of a cement substrate by electrifying the cement substrate. The system uses an electric migration method to cause carbonate ions to migrate directionally, quickly enter a cement-based specimen, and chemically react with alkaline components such as calcium hydroxide and calcium silicate hydrate in the specimen to form a dense substance, thereby accelerating carbonization.

[0034] The present invention utilizes a carbon dioxide pressure detector to reflect the carbon dioxide pressure value in real time, and timely supplements and adjusts the carbon dioxide concentration by controlling the opening and closing state of the valve, thereby maintaining the stable carbonate ion concentration required during the operation of the device and the system, thereby achieving the CO2 concentration in the entire device. 2 Concentration and pressure are controllable; CO 2 The main advantage of controllable concentration is to ensure that CO 3 2- The ion content is maintained at a stable state and the pressure is controllable mainly to further drive CO under pressure. 2 Dissolved and in solution CO 3 2- The ion migration is accelerated to improve the carbonization or mineralization efficiency of cement-based specimens. Compared with the existing cement-based carbonization methods, this technology combines the electromigration method to enable carbonate ions to quickly enter the cement-based specimens under the action of the electric field, thereby achieving full carbonization while greatly reducing the carbonization time. The degree of carbonization completion can be observed in real time through the terminal display screen to further ensure the adequacy of carbonization or mineralization.

[0035] This system allows carbonate ions to migrate into the interior of a specimen with a certain water content, and can directly react with alkaline components such as calcium hydroxide and hydrated calcium silicate. It has no special requirements for various test conditions, making the entire operation process simpler and more convenient.

[0036] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for explanation.

[0038] Figure 1 A system for accelerating carbonization or mineralization of cementitious substrates by electrifying the cementitious substrate.

[0039] Figure 2 A top view of carbon dioxide extending into the solution.

[0040] Figure 3 The operation process of the device and system.

[0041] Figure 4 Predicted graph of carbonate ion concentration over time.

[0042] In the figure, 1 is the terminal display screen, 2 is the valve, 3 is the carbon dioxide delivery pipeline, 4 is the electrode plate, 5 is the insulating layer, 6 is the deionized water, 7 is the area one, 8 is the carbonate ion concentration measuring instrument, 9 is the cement-based test piece, 10 is the filter cloth built-in layered box with sodium hydroxide crystals, 11 is the carbon dioxide pressure detector, 12 is the area two, 13 is the area three, and 14 is the rubber layer that is permeable to ions but not permeable to water. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0044] like Figure 1 As shown, the cement substrate electrification accelerated carbonization or mineralization system provided in this embodiment includes a test bench, on which a carbonate ion generation unit, a specimen tank, an electric field acceleration unit, and a carbonization state detection unit are provided;

[0045] The carbonate ion generating unit is used to generate carbonate ions required for the carbonization reaction in the test piece;

[0046] The test piece slot is used to place the test piece in the test piece slot;

[0047] The electric field acceleration unit is arranged on both sides of the test piece slot, and is used to apply a voltage for accelerating the migration of carbonate ions to the test piece;

[0048] The carbonization state detection unit is used to determine the carbonization degree of the test piece by detecting the concentration of carbonate ions passing through the test piece;

[0049] The carbonate ion generating unit comprises a solution tank, a gas delivery device, and a measuring device;

[0050] The lower part of the solution tank is configured as a solution part (first area) for accommodating a saturated sodium hydroxide solution, the upper part of the solution tank is a gas part (second area) for accommodating carbon dioxide gas, the measuring device is arranged in the solution part for measuring the carbonate ion concentration in the solution; the gas delivery device is used to deliver carbon dioxide gas to the gas part in the solution tank;

[0051] The measuring device in this embodiment is a carbonate ion concentration detection unit;

[0052] The gas delivery device includes a carbon dioxide delivery pipeline, a valve, and a carbon dioxide pressure detector; the carbon dioxide delivery pipeline is used to deliver carbon dioxide gas to the test bench; the valve is arranged on the carbon dioxide delivery pipeline to control the on-off state of the carbon dioxide gas delivery; the carbon dioxide pressure detector is arranged in the gas part to detect the carbon dioxide gas pressure;

[0053] The valve is connected to a processor, and a control signal is generated through analysis and processing by the processor, thereby realizing an intelligent control process of the valve.

[0054] The top of the solution tank is provided with sodium hydroxide crystals wrapped with filter cloth. When sodium hydroxide solution is needed, water can be added to the solution tank. When the water submerges the sodium hydroxide crystals, a saturated sodium hydroxide solution can be formed in the solution tank. The filter cloth is provided with a box body, and multiple layers are provided in the box body. A quantitative crystal is placed in each layer. By changing the immersion depth, a solution of a determined concentration is obtained. In this way, sodium hydroxide solutions of different concentrations can be obtained by controlling the amount of water added, or a saturated sodium hydroxide solution can be obtained.

[0055] In this embodiment, the sodium hydroxide crystals are contained in the filter cloth, which can ensure that the sodium hydroxide solution is in a saturated state, thereby obtaining a stable concentration of carbonate ions.

[0056] The rubber layer in this embodiment is ion-permeable but water-impermeable, and the electrode plate has water-permeable holes, so that the solutions in area 1 and area 3 can pass through the holes. However, due to the effect of the rubber layer, the solutions cannot directly contact the test piece.

[0057] The carbonate ion generating unit further comprises a carbon dioxide intake control unit, which is used to determine the on / off state of the valve according to the carbon dioxide pressure so as to be suitable for delivering carbon dioxide gas into the solution tank;

[0058] This embodiment uses a carbon dioxide intake control unit to control a stable carbon dioxide supply, combined with a saturated sodium hydroxide solution, to keep the reaction rate of carbon dioxide and sodium hydroxide constant, thereby obtaining a sodium carbonate solution with a stable concentration. At the same time, the power supply size is kept constant, the electric field strength is kept constant, and the migration speed of ions is stable, so that the carbonate ion concentration can be maintained at a stable state.

[0059] like Figure 2 As shown, Figure 2 Schematic diagram of carbon dioxide extending into the solution. In this embodiment, the carbonate ion concentration can be detected in real time, and the carbonate ion concentration in the left test tank measured in real time is used to coordinate the reverse control of CO 2 The amount, rate and CO 2 pressure;

[0060] At the same time, the system also includes a display device, which includes a display screen and a processing and analysis unit; the carbon dioxide pressure detector and the measuring device are respectively connected to the processing and analysis unit; the display screen is used to output the detection result data of the carbon dioxide pressure detector; and is used to output the detection result of the measuring device on the carbonate ion concentration in the solution;

[0061] The electric field acceleration unit includes an anode plate, a cathode plate, and a power supply; the anode plate and the cathode plate are respectively connected to the power supply, and the anode plate and the cathode plate are respectively arranged on both sides of the test piece, and the electric field formed by the anode plate and the cathode plate is used to migrate the carbonate ions in the solution part to the test piece;

[0062] In this embodiment, a rubber membrane can be used to separate the solution from the test piece to ensure that the movement between ions is formed by the action of the electric field, that is, a rubber membrane is added between the test piece and the solution, which is permeable to carbonate ions but impermeable to water.

[0063] The carbonization state detection unit comprises a deionized water tank, one side of which is used to set the test piece and receive the carbonate ions passing through the test piece; a detector for detecting the concentration of carbonate ions is arranged in the deionized water tank; the detector is connected to a display device and displays the concentration of carbonate ions in the deionized water tank on the display screen;

[0064] The display screen in this embodiment is used to display fluctuations in carbon dioxide pressure values, changes in carbonate ion concentrations, etc.; the electrode plates therein can provide a stable electric field to achieve directional movement of ions;

[0065] The wall of the water tank in this embodiment is provided with an insulating layer; the inner wall of the entire device is provided with an insulating layer, the main function of which is to prevent the test piece and the solution from being conductive and causing leakage, thereby ensuring the safety of the test process.

[0066] The solution tank in this embodiment is a part of the area in the figure, and the part of the area includes two stages, wherein the first stage is a saturated sodium hydroxide solution, and the second stage is a sodium hydroxide and sodium carbonate solution;

[0067] The deionized water tank in this embodiment is area three, in which a carbonate ion concentration measuring instrument is provided to monitor the concentration of carbonate ions in area three;

[0068] In this embodiment, the gas portion above the solution tank is area 2, and a carbon dioxide pressure detector is provided in area 2 to monitor the pressure value of carbon dioxide in area 2; in area 2, air is initially present and then filled with carbon dioxide gas.

[0069] The following describes in detail the principle and operation process of the cement substrate electrification accelerated carbonization or mineralization system:

[0070] 1) Place the cement-based specimen between two electrode plates;

[0071] 2) Open the valve to allow carbon dioxide to enter area 2 through the carbon dioxide delivery pipeline;

[0072] 3) In area 1, carbon dioxide reacts chemically with saturated sodium hydroxide solution, and the reaction formula is:

[0073] 2NaOH+CO 2 →Na 2 CO 3 +H 2 O;

[0074] The generated sodium carbonate exists in the form of carbonate ions and sodium ions. At the same time, area 2 is filled with carbon dioxide and has a certain pressure. The carbon dioxide concentration in area 2 can be indirectly monitored and replenished in time through the terminal display screen through the carbon dioxide pressure detector to ensure the stability of the carbonate ion concentration in area 1 in the second stage.

[0075] 4) After a sodium carbonate solution of a certain concentration is obtained, when region 1 is in the second stage and sodium hydroxide has not completely generated sodium carbonate, the positive electrode plate is connected to the right side of the specimen, the negative electrode plate is connected to the left side of the specimen and the electrode plate power is turned on, and the electric migration acceleration method is used to make carbonate ions quickly enter the specimen and migrate to the positive electrode plate under the action of the electric field;

[0076] 5) In the specimen, carbonate ions react chemically with calcium hydroxide and alkaline components such as hydrated calcium silicate to form dense materials. The main reaction formula is:

[0077] Ca(OH) 2 +CO 3 2- →CaCO 3 ↓+2OH - ;

[0078] 3Ca 2 SiO 2 .3H 2 O+CO 3 2- →3CaCO 3 ↓+2SiO 2+3H 2 O;

[0079] 6) Area three contains deionized water, and a carbonate ion concentration meter is installed on the bottom to effectively monitor the concentration of carbonate ions. Its changing value over time is recorded and displayed on the terminal display screen to determine the carbonation degree of the cement-based specimen.

[0080] like Figure 3 As shown, Figure 3 The operation process of the device and the system, the method for accelerating carbonization or mineralization of cement substrate by electrifying the cement substrate comprises the following steps:

[0081] S1: placing the test object, i.e., the cement-based specimen, between the electrode plates;

[0082] S2: Open the valve to allow carbon dioxide to enter area 1 and fill area 2, and form a stable pressure in area 2; after obtaining a mixed solution of sodium hydroxide and sodium carbonate, close the valve;

[0083] S3: Turn on the power supply, and the electric field between the electrode plates accelerates the carbonate ions to move in a directional manner and react with the alkaline components inside the specimen;

[0084] S4: monitor the carbon dioxide pressure in area 2 and the sodium carbonate concentration in area 3 through the monitoring instrument; and display the concentration change graph on the display screen; determine the degree of carbonization or mineralization completion;

[0085] In this embodiment, after turning on the power supply, since there is an excess of sodium hydroxide crystals in region one, the sodium hydroxide in region one can be replenished in real time to maintain its concentration stable. In addition, since the electrode plate causes carbonate ions to move in a directional manner, it can be regarded as consuming carbonate ions all the time, and the gaseous carbon dioxide in region two can react with sodium hydroxide in real time to generate new sodium carbonate, so that the entire region one is always in a state of mixing sodium hydroxide and sodium carbonate. By controlling the running time through the carbonate ion concentration graph of region three in the terminal display screen, test pieces with different degrees of carbonization can be obtained. By monitoring the concentration of carbonate ions in region three and reflecting its change graph over time through the terminal display screen, when the graph shows a linear growth trend, it can be judged that the cement-based test piece has completed mineralization.

[0086] The following functions can be achieved by electrifying the cement matrix to accelerate carbonization or mineralization system:

[0087] 1. Accelerate carbonization by powering on: Using the electric migration method, carbonate ions are accelerated to migrate in a directional manner under the action of the electric field, quickly enter the cement-based specimen, and react chemically with alkaline components such as calcium hydroxide and hydrated calcium silicate to form dense materials, thus realizing accelerated carbonization by powering on;

[0088] 2. Electricity is applied to cement-based specimens to accelerate carbonization or mineralization:

[0089] ①By monitoring the concentration of carbonate ions in area 3 and reflecting its change over time through the terminal display screen, when the graph shows a certain regular growth trend, it can be judged that the cement-based specimen is in the complete carbonization or mineralization stage;

[0090] ② Place different cement-based specimens in the device and control the same carbonization time to observe and compare their anti-carbonation capabilities;

[0091] like Figure 4 As shown, Figure 4 This is a prediction graph of carbonate ion concentration changing with time. In segment 0a (T1 moment), the carbonate ion concentration is 0. It can be inferred that during this period, the carbonate ions are fully reacted by the alkaline components inside the specimen. In segment ab (T1-T2 stage), carbonate ions begin to appear, but the growth of carbonate ions is unstable and presents a nonlinear growth. It can be inferred that at this time, the alkaline components inside the specimen are gradually consumed, but mineralization is not completely achieved. After point b (T2 moment), the carbonate ion concentration presents a linear growth. It can be inferred that point b is the time node when the specimen is completely mineralized.

[0092] The system provided in this embodiment is further provided with a carbonization degree automatic identification module, and the carbonization degree automatic identification module is processed by an operating program set in the single-chip microcomputer, so that when the carbonate ion concentration increases linearly, the carbonization can be automatically terminated.

[0093] The carbonate ion concentration in area 1 of this embodiment can be kept within a stable range by controlling the carbon dioxide intake control unit and maintaining the sodium hydroxide solution in a saturated state. The power supply remains unchanged, the electric field strength is constant, and the carbonate ion migration amount is stable. The carbonate ions in the deionized water tank in area 3 are only related to the consumption.

[0094] In addition, this system indirectly observes and analyzes the degree of carbonation or mineralization of cement-based specimens by monitoring the growth of carbonate ion concentration in the deionized water tank, making it visual. This system can also be used to compare the carbonation resistance of different cement-based specimens.

[0095] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A system for accelerating carbonization or mineralization of cement substrate by electrification, including a test bench, characterized in that: The test bench is provided with a carbonate ion generating unit, a test piece slot, an electric field accelerating unit, and a carbonization or mineralization state detecting unit; The carbonate ion generating unit is used to generate carbonate ions required for the carbonization reaction in the test piece; The test piece slot is used to place the test piece; The electric field acceleration unit is arranged on both sides of the test piece slot, and is used to apply a voltage for accelerating the migration of carbonate ions to the test piece; The carbonization or mineralization state detection unit is used to determine the carbonization degree of the test piece by detecting the concentration of carbonate ions passing through the test piece.

2. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: The carbonate ion generating unit comprises a solution tank, a gas delivery device, and a measuring device; The lower part of the solution tank is configured as a solution part for accommodating a saturated sodium hydroxide solution, the upper part of the solution tank is a gas part for accommodating carbon dioxide gas, the measuring device is arranged in the solution part for measuring the carbonate ion concentration in the solution; the gas delivery device is used to deliver carbon dioxide gas to the gas part in the solution tank.

3. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: The gas delivery device includes a carbon dioxide delivery pipeline, a valve, and a carbon dioxide pressure detector; the carbon dioxide delivery pipeline is used to deliver carbon dioxide gas to the test bench; the valve is arranged on the carbon dioxide delivery pipeline to control the on-off state of the carbon dioxide gas delivery; the carbon dioxide pressure detector is arranged in the gas part to detect the carbon dioxide gas pressure.

4. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: The carbonate ion generating unit further comprises a carbon dioxide intake control unit, which is used to determine the on-off state of the valve according to the carbon dioxide pressure so as to be suitable for conveying carbon dioxide gas into the solution tank.

5. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: It also includes a display device, which includes a display screen and a processing and analysis unit; the carbon dioxide pressure detector and the measuring device are respectively connected to the processing and analysis unit; the display screen is used to output the detection result data of the carbon dioxide pressure detector; and is used to output the detection result of the measuring device on the carbonate ion concentration in the solution part.

6. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: The electric field acceleration unit includes an anode plate, a cathode plate, and a power supply; the anode plate and the cathode plate are respectively connected to the power supply, and the anode plate and the cathode plate are respectively arranged on both sides of the test piece, and the electric field formed by the anode plate and the cathode plate is used to accelerate the migration of carbonate ions in the solution into the test piece.

7. The system for accelerating carbonization or mineralization of cement substrate by electrification according to claim 1, characterized in that: The carbonization state detection unit comprises a deionized water tank, one side of which is used to set the test piece and receive carbonate ions passing through the test piece; a detector for detecting the concentration of carbonate ions is arranged in the deionized water tank.

8. A method for carbonizing or mineralizing a cement substrate using the system for accelerating carbonizing or mineralizing by electrifying the cement substrate according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: placing the test object, i.e., the cement-based specimen, between the electrode plates; S2: Open the valve to allow carbon dioxide to enter area 1 and fill area 2, and form a stable pressure in area 2; after obtaining a mixed solution of sodium hydroxide and sodium carbonate, close the valve; S3: Turn on the power supply, and the electric field between the electrode plates accelerates the carbonate ions to move in a directional manner and react with the alkaline components inside the specimen; S4: Monitor the carbon dioxide pressure in area 2 and the sodium carbonate concentration in area 3 in real time through monitoring instruments; display the concentration change graph on the display screen; and determine the degree of completion of carbonization or mineralization.

9. The method for accelerating carbonization or mineralization of cement substrate by applying electricity as claimed in claim 8, characterized in that: After turning on the power in step S3, the carbonization treatment is performed according to the following steps. The specific steps are as follows: Excessive sodium hydroxide crystals are placed in area 1 to maintain the concentration of sodium hydroxide solution in area 1; By inputting gaseous carbon dioxide into area two to react with sodium hydroxide to generate new sodium carbonate, the entire area one is in a state of mixing sodium hydroxide and sodium carbonate.

10. The method for accelerating carbonization or mineralization of cement substrate by applying electricity as claimed in claim 8, characterized in that: After turning on the power in step S3, mineralization treatment is performed according to the following steps. The specific steps are as follows: By monitoring the concentration of carbonate ions in area three and displaying its change over time on the terminal display screen, when the graph shows a linear growth trend, it can be determined that the cement-based specimen has completed mineralization; By controlling the running time through the regional tricarbonate ion concentration graph on the terminal display screen, specimens with different carbonization degrees can be obtained.

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