Accelerated Simulation Test Method for Chloride Erosion of Cement-Based Materials

Abstract

The present invention belongs to the technical field of durability test and detection of cement-based materials. It discloses a method for accelerating the simulation test of chloride salt erosion of cement-based materials, which sets up a corrosion box, a water storage tank, a chiller, a pipeline system and a control cabinet. A temperature sensor, a liquid level sensor, a chloride ion concentration tester and a stirring unit are installed on the inner wall of the corrosion box; a corrosion agent feeding unit is installed on the side wall of the corrosion box; a heating plate, a support column and a protection plate are installed at the bottom of the corrosion box. By controlling the temperature, water level and concentration of the solution in the corrosion box, the environmental simulation test of the cement-based materials is realized. The present invention can simultaneously realize corrosion environments with different temperatures and different chloride ion concentrations, and can simultaneously conduct tests on multiple groups of different corrosion environments; the present invention can ensure the constancy of the chloride ion concentration of the solution for a long time without replacing the solution; it can realize the stable control of temperature and concentration, and the test data obtained from subsequent tests are more accurate and reliable; it has a high degree of automation and improves work efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of durability test and detection of cement-based materials, and particularly relates to a method for accelerating the simulation test of chloride salt erosion of cement-based materials. Background Art

[0002] The construction of marine infrastructure such as port terminals and cross-sea bridges is inseparable from cement-based materials. The structures of cement-based materials are immersed in seawater all year round. Due to the corrosion of chloride ions, the durability of cement-based materials decreases, seriously affecting the safety and service life of structures. Systematically studying the damage evolution law of cement-based materials under simulated marine environments and understanding the erosion mechanism of chloride ions in seawater on cement-based materials are of great significance for taking effective measures to prevent premature structural decline of marine infrastructure and thus extending its service life. However, at present, in the research on the resistance of cement-based materials to chloride salt erosion, the simulation of chloride salt environments usually adopts the immersion method under natural conditions. Research shows that temperature and chloride ion concentration have a significant impact on the diffusion of chloride ions in cement-based materials. Through the analysis of the existing simulation research methods for chloride salt erosion of cement-based materials, it can be found that there are deficiencies in the existing environmental simulation methods of natural immersion, including: (1) The temperature is not easy to control. Affected by the weather temperature, the temperature of the chloride salt solution fluctuates greatly; (2) Under long-term immersion, on the one hand, part of the water in the solution will evaporate, resulting in a relatively high chloride salt concentration in the solution; on the other hand, chloride ions continuously diffuse into the cement-based materials, resulting in a decrease in the chloride salt concentration in the solution. Therefore, the chloride salt concentration in the solution constantly changes, and the actual chloride salt concentration in the solution is not equal to the set chloride salt concentration; (3) In the immersion corrosion environment, the chloride ion concentration in the solution will change, so the solution needs to be replaced regularly; (4) Common impregnation devices are generally single corrosion boxes, and a set of impregnation devices cannot achieve corrosion environments with different temperatures or different chloride salt concentrations. Therefore, in order to accurately simulate the simulated temperature and the concentration of the erosion solution and improve the test accuracy and test efficiency, it is necessary to develop a new type of accelerated simulation test machine and test method for chloride salt erosion of cement-based materials. Summary of the Invention

[0003] The purpose of the present invention is to address the above existing problems and deficiencies, and provide a method for accelerating the simulation test of chloride salt erosion of cement-based materials, which can effectively control the temperature and concentration of the solution in which the cement-based materials are located, and improve the test accuracy and test effect.

[0004] To achieve the above purpose, the technical solution adopted is:

[0005] A method for accelerating the simulation test of chloride salt erosion of cement-based materials uses an accelerated simulation test machine for chloride salt erosion of cement-based materials to conduct a simulation test. The accelerated simulation test machine for chloride salt erosion of cement-based materials includes a corrosion box, a water storage tank, a temperature control component, a feeding component, and a control cabinet.

[0006] A water storage tank is provided with a water inlet pipe for the water storage tank, and a first control valve is arranged on the water inlet pipe for the water storage tank. A water replenishing assembly is arranged between the water storage tank and the corrosion tank, and the water replenishing assembly is used for quantitatively replenishing water into the corrosion tank; the temperature control assembly is used for adjusting the temperature of the solution in the corrosion tank; the feeding assembly is arranged at the top or side of the corrosion tank, and the feeding assembly is used for quantitatively adding materials into the corrosion tank;

[0007] A temperature sensor, a first liquid level sensor and a chloride ion concentration tester are arranged in the corrosion tank. The control cabinet is used for acquiring the detection signals of the temperature sensor, the first liquid level sensor and the chloride ion concentration tester, and controlling the corresponding water replenishing assembly, temperature control assembly and feeding assembly to act;

[0008] The method for accelerating the simulation test of chloride salt erosion of cement-based materials includes: assembling a simulation test machine for accelerating the chloride salt erosion of cement-based materials, and obtaining the water injection volume and the addition amount of the corrosion agent in the corrosion tank according to the volume of the cement-based material specimen and the solution concentration in the corrosion tank; controlling the water level height in the water storage tank through the control cabinet, and quantitatively injecting water from the water storage tank into the corrosion tank, and at the same time controlling the feeding assembly to quantitatively add the corrosion agent into the corrosion tank through the control cabinet; starting the temperature control assembly, adjusting the temperature of the solution in the corrosion tank to a set value, and putting the cement-based material specimen into the corrosion tank after the temperature and concentration of the solution in the corrosion tank reach the set value;

[0009] Monitoring the signal data of the temperature sensor, the first liquid level sensor and the chloride ion concentration tester, and obtaining the temperature signal, liquid level signal and concentration signal of the solution in the corrosion tank in real time; when the temperature signal, liquid level signal or concentration signal changes, the control cabinet acquires the corresponding signal and controls the corresponding water replenishing assembly, temperature control assembly or feeding assembly to adjust;

[0010] After reaching the set soaking age, the control cabinet controls the corrosion tank to drain the solution, takes out the cement-based material specimen, and rinses the corrosion tank.

[0011] A lower limit liquid level sensor and an upper limit liquid level sensor are arranged in the water storage tank. When the liquid level in the water storage tank drops to the lower limit liquid level sensor, the control cabinet acquires the signal of the lower limit liquid level sensor and controls the first control valve on the water inlet pipe of the water storage tank to open. When the liquid level rises to the upper limit liquid level sensor, the control cabinet acquires the signal of the upper limit liquid level sensor and controls the first control valve on the water inlet pipe of the water storage tank to close.

[0012] When the first liquid level sensor monitors that the liquid level of the corrosion tank drops, the control cabinet acquires the signal of the first liquid level sensor and controls the water replenishing assembly to quantitatively supplement the water in the water storage tank into the corrosion tank. When the first liquid level sensor monitors that the liquid level in the corrosion tank returns to the set value, the control cabinet controls the water replenishing assembly to stop acting.

[0013] It further includes a stirring unit, and the stirring unit includes stirring blades and a stirring motor arranged on the side wall of the corrosion tank; or the stirring unit includes a plurality of water inlet holes arranged at the bottom of the corrosion tank, a plurality of water outlet holes arranged at the top of the corrosion tank, a fourth driving pump and a connecting pipe arranged between the water inlet holes and the water outlet holes;

[0014] When mixing the corrosive agent and water, adjusting the temperature, adjusting the concentration, and cleaning the corrosion tank inside the corrosion tank, the control cabinet drives the stirring unit to start. When the stirring unit is working, the first liquid level sensor stops working.

[0015] When the chloride ion concentration tester monitors that the solution concentration in the corrosion tank decreases, the control cabinet obtains the signal of the chloride ion concentration tester, determines the dosage of the corrosive agent, and controls the feeding assembly to quantitatively feed the corrosion tank;

[0016] The stirring unit starts and shuts down after regular stirring.

[0017] The feeding assembly includes a hopper, a second control valve arranged at the discharge port of the hopper, a weighing box and a conveyor. The weighing box is correspondingly arranged below the discharge port of the hopper. A pressure sensor is arranged at the bottom of the weighing box, and a third control valve is arranged at the discharge port at the bottom of the weighing box; The conveyor is correspondingly arranged below the discharge port of the weighing box, and the conveyor is used to convey the materials falling in the weighing box into the corrosion tank;

[0018] When the feeding assembly performs the feeding action, the control cabinet controls the second control valve to open, and the corrosive agent is fed from the hopper into the weighing box. After the pressure sensor detects that the weight in the weighing box reaches the set value, the second control valve closes, and the third control valve and the conveyor start to feed.

[0019] There are at least two temperature sensors in the corrosion tank, and at least one temperature sensor is arranged at the top and bottom of the corrosion tank; When the temperatures detected by two of the temperature sensors are inconsistent, the stirring unit starts until the values monitored by the temperature sensors are the same;

[0020] When the temperature sensor monitors that the solution temperature in the corrosion tank is too high or too low, the control cabinet obtains the signal of the temperature sensor and controls the temperature control component and the stirring unit to act to adjust the solution temperature.

[0021] The temperature control component includes a heating plate and a chiller. The heating plate is arranged at the bottom of the corrosion tank. Support columns are arranged circumferentially around the heating plate, and a protection plate located above the heating plate is arranged at the top of the support columns. A refrigerator is arranged inside the chiller. A first circulating inlet pipe, a first circulating outlet pipe and a first driving pump are arranged between the chiller and the corrosion tank. The first driving pump is used to pump the solution in the corrosion tank into the chiller and pump it back into the corrosion tank after cooling.

[0022] When the temperature of the solution in the corrosion tank is too low, the control cabinet obtains the temperature signal of the temperature sensor and makes the heating plate work.

[0023] When the temperature of the solution in the corrosion tank is too high, the control cabinet obtains the temperature signal of the temperature sensor, controls the refrigerator and the first driving pump to act. The first driving pump pumps the solution in the corrosion tank into the chiller for refrigeration and cooling and then sends it back to the corrosion tank.

[0024] A cleaning component is arranged between the water storage tank and the chiller. The cleaning component includes a second driving pump and a cleaning pipeline connecting the chiller and the water storage tank. A sewage discharge pipe is arranged at the bottom of the chiller, or a sewage discharge pipe branches out from the first circulating outlet pipe. The second driving pump is used to pump the water in the water storage tank into the chiller through the cleaning pipeline. After the temperature in the corrosion tank is adjusted by the chiller, the second driving pump is started to clean the chiller.

[0025] After the cement-based material specimen is taken out, the corrosion tank and the chiller are cleaned. The water in the water storage tank is pumped into the corrosion tank through the water replenishing component. The water in the corrosion tank enters the chiller through the first circulating inlet pipe and is discharged through the drain pipe at the bottom of the chiller or through the drain pipe arranged on the first circulating outlet pipe.

[0026] The chloride salt erosion acceleration simulation test machine for cement-based materials includes at least two corrosion tanks. A water replenishing component is arranged between the water storage tank and each corrosion tank. The control cabinet controls each corrosion tank to work independently.

[0027] Adopting the above technical solution, the beneficial effects obtained are as follows:

[0028] This application can simulate corrosion environments with different temperatures and different chloride ion concentrations, and can conduct tests on multiple groups of different corrosion environments simultaneously. In the soaking environment, due to the evaporation of water and the diffusion of chloride ions into the cement-based material, the chloride ion concentration will change over time. This application can ensure that the chloride ion concentration of the solution remains constant for a long time without replacing the solution. Stable control of temperature and concentration can be achieved, ensuring that the test data obtained in subsequent tests is more accurate and reliable. The degree of automation is high, improving work efficiency.

[0029] This application can accurately control the solution temperature, ensuring that the solution temperature is constant. When the solution temperature is higher than the set temperature, it can be cooled by a chiller, and when the solution temperature is lower than the set temperature, it can be heated by a heating plate; the constant chloride ion concentration in the solution can be ensured by a chloride ion concentration tester and a corrosion agent feeding assembly. During the soaking process of the cement-based material, it can eliminate the change of the corrosion condition caused by the change of the chloride ion concentration due to diffusion and evaporation; this application does not require regular replacement of the solution, thus ensuring that the solution concentration remains unchanged for a long time until the specimen completes the corrosion age period.

[0030] This application can simultaneously conduct the chloride salt erosion resistance tests of cement-based materials in multiple different corrosion environments (different temperatures and different concentrations); the stable control of temperature and concentration in this application ensures that the test data obtained in subsequent tests is more accurate and reliable; this application has a high degree of automation, simple operation, and can greatly improve work efficiency. Brief Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Among them, the drawings are only used to show some embodiments of the present invention, rather than limiting all embodiments of the present invention thereto.

[0032] Figure 1 It is one of the structural schematic diagrams of the chloride salt erosion accelerated simulation test machine for cement-based materials of the present invention.

[0033] Figure 2 It is the second structural schematic diagram of the chloride salt erosion accelerated simulation test machine for cement-based materials of the present invention.

[0034] Figure 3 It is the third structural schematic diagram of the chloride salt erosion accelerated simulation test machine for cement-based materials of the present invention.

[0035] Figure 4 It is the internal schematic diagram of the corrosion box of the present invention.

[0036] Figure 5 It is the structural schematic diagram of the heating plate of the present invention.

[0037] Figure 6 It is the structural schematic diagram of the feeding assembly of the corrosion agent of the present invention.

[0038] Figure 7 It is the installation schematic diagram of the chloride ion concentration tester of the present invention.

[0039] Figure 8 It is the structural schematic diagram of the control cabinet of the present invention.

[0040] Figure 9 It is the control flow chart of the water replenishment of the water storage tank of the present invention.

[0041] Figure 10 It is the temperature control flow chart of the etching tank of the present invention.

[0042] Figure 11 It is the liquid level control flow chart of the etching tank of the present invention.

[0043] Figure 12 It is the chloride ion concentration control flow chart of the etching tank of the present invention.

[0044] Figure 13 It is the external discharge solution control flow chart of the etching tank of the present invention.

[0045] Serial numbers in the figure:

[0046] 1 - First etching tank, 11 - Temperature sensor, 12 - First liquid level sensor, 13 - Adjusting unit, 131 - Fixed plate, 132 - Fixed bolt, 133 - Sliding rod, 134 - Sliding ring, 135 - Limit bolt, 14 - Chloride ion concentration tester, 15 - Stirring unit, 16 - Feeding assembly, 161 - Hopper, 162 - Hopper cover, 163 - Hopper discharge port, 164 - Second control valve, 165 - Weighing box, 166 - Pressure sensor, 167 - Third control valve, 168 - Weighing box discharge port, 169 - Belt conveyor belt, 17 - Heating plate, 171 - Support column, 172 - Protection plate, 181 - Etching tank water outlet, 182 - Etching tank water inlet, 183 - Etching tank water replenishing port, 2 - Second etching tank, 3 - Third etching tank, 4 - Water storage tank, 41 - Water storage tank water inlet, 42 - Water storage tank water outlet, 43 - Water storage tank water inlet pipe, 44 - First control valve, 5 - Chiller, 51 - Chiller water inlet, 52 - Chiller water outlet, 6 - Pipeline system, 611 - Water storage tank main water discharge pipe, 612 - Etching tank water replenishing pipe, 613 - Chiller water replenishing pipe, 614 - First circulation water inlet pipe, 615 - First circulation water outlet pipe, 616 - Etching tank water discharge pipe, 617 - Etching tank water inlet pipe, 618 - Drain pipe, 619 - Pipeline control valve, 7 - Control cabinet, 71 - Display screen, 72 - Keyboard, 73 - Mouse, 74 - Emergency stop button, 75 - Start button, 76 - Stop button, 77 - Host. Detailed implementation manners

[0047] In the following, the exemplary solutions of the embodiments of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning as understood by those of ordinary skill in the art.

[0048] In the description of the present invention, it should be understood that the expressions "first" and "second" are used to describe the various elements of the present invention, and do not represent any order, quantity or importance limitation, but are only used to distinguish one component from another.

[0049] It should be noted that when an element is described as "connected", "coupled" or "linked" to another element, it may mean direct connection, coupling or linking, but it should be understood that there may be intermediate elements between them; that is, it covers both direct and indirect connection positional relationships.

[0050] It should be noted that the use of words such as "a" or "an" does not necessarily imply a quantity limitation. Words such as "comprising" or "including" mean that the elements or objects preceding the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0051] It should be noted that terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, which are for the convenience of describing the present invention, rather than the device or element must have a specific orientation, be constructed and operated in a specific orientation; when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0052] This application discloses a method for accelerating the simulation test of chloride salt erosion of cement-based materials. A simulation test is carried out by using a cement-based material chloride salt erosion acceleration simulation test machine. In this embodiment, simulation tests are carried out on multiple groups of cement-based material specimens simultaneously.

[0053] See Figures 1 - 8 , a cement-based material chloride salt erosion acceleration simulation test machine, including a corrosion chamber, a water storage tank 4, a temperature control component, a feeding component and a control cabinet 7, Figure 8 The control cabinet 7 shown in includes a mainframe 77, a display screen 71, a keyboard 72 and a mouse 73. An emergency stop button 74, a start button 75 and a stop button 76 are also arranged on the mainframe; there are at least two corrosion chambers. A water replenishing component is arranged between the water storage tank 4 and each corrosion chamber. According to the needs of the test, 2-10 groups, or more corrosion chambers can be set. According to the water replenishing pressure of the corresponding water storage tank, 3-5 corrosion chambers can share one water storage tank. As shown in the figure, there are three corrosion chambers in this application, namely the first corrosion chamber 1, the second corrosion chamber 2 and the third corrosion chamber 3. The purpose of using three corrosion chambers is to be able to simultaneously simulate the environments of multiple groups of different (different temperatures and different chloride ion concentrations) cement-based material chloride salt erosion resistance tests; the three corrosion chambers share one water storage tank 4, and the pipelines between the three corrosion chambers and the water storage tank 4 can be set independently in a completely separate manner, or can be in a parallel form with a main pipeline and branch pipelines. In the figure of this embodiment, the parallel form of the main pipeline and branch pipelines is adopted; in addition, the corrosion chamber of this application includes an inner shell, a heat insulation layer and an outer shell, which can reduce the temperature change of the solution in the corrosion chamber.

[0054] A method for accelerating the simulation test of chloride erosion of a cement-based material in this application includes: assembling a chloride erosion acceleration simulation test machine for the cement-based material, and obtaining the water injection volume and the addition amount of the corrosion agent in the corrosion tank according to the volume of the cement-based material specimen and the solution concentration in the corrosion tank; controlling the water level height in the water storage tank through the control cabinet, and quantitatively injecting water from the water storage tank into the corrosion tank, and at the same time controlling the feeding component to quantitatively add the corrosion agent into the corrosion tank through the control cabinet; starting the temperature control component, adjusting the solution temperature in the corrosion tank to the set value, and after the temperature and concentration of the solution in the corrosion tank reach the set value, putting the cement-based material specimen into it;

[0055] Monitoring the signal data of the temperature sensor, the first liquid level sensor and the chloride ion concentration tester, and obtaining the temperature signal, the liquid level signal and the concentration signal of the solution in the corrosion tank in real time; when the temperature signal, the liquid level signal or the concentration signal changes, the control cabinet obtains the corresponding signal and controls the corresponding water replenishing component, temperature control component or feeding component to adjust;

[0056] After reaching the set soaking age, the control cabinet controls the corrosion tank to drain the solution, takes out the cement-based material specimen, and rinses the corrosion tank.

[0057] After the first debugging is completed, the cement-based material specimen is placed in the solution in the corrosion tank for the erosion simulation test. As time goes by, the water level, temperature and concentration in the corrosion tank do not change. Therefore, this application also includes the control of the water level in the water storage tank, the temperature control in the corrosion tank, the water level control in the corrosion tank, and the concentration control in the corrosion tank.

[0058] As Figure 9 shown, the control of the water level in the water storage tank: As Figures 1 - 3 shown, the water storage tank 4 is provided with a water storage tank water inlet 41, a water storage tank water outlet 42, a water storage tank water inlet pipe 43 and a first control valve 44. The first control valve is a water storage tank solenoid valve, and a liquid level sensor is installed inside the water storage tank 4. The water storage tank 4 can ensure that there is sufficient water in the water storage tank through the liquid level sensor in the water storage tank. A lower limit liquid level sensor and an upper limit liquid level sensor are arranged in the water storage tank. When the liquid level is lower than the lower limit liquid level sensor, the first control valve 44 opens to replenish water into the water storage tank 4. When the liquid level reaches the upper limit liquid level sensor, the first control valve 44 closes to complete the water replenishment. Specifically, when the liquid level in the water storage tank drops to the lower limit liquid level sensor, the control cabinet obtains the signal of the lower limit liquid level sensor and controls the first control valve on the water storage tank water inlet pipe to open. When the liquid level rises to the upper limit liquid level sensor, the control cabinet obtains the signal of the upper limit liquid level sensor and controls the first control valve on the water storage tank water inlet pipe to close.

[0059] The structural characteristics in the corrosion tank: As Figure 4 and Figure 5As shown in the figure, a temperature sensor 11, a first liquid level sensor 12, an adjustment unit 13, a chloride ion concentration tester 14, and a stirring unit 15 are installed on the inner wall of the corrosion tank; a corrosion agent feeding assembly 16 is installed on the side wall of the corrosion tank. The temperature sensor 11, the first liquid level sensor 12, and the chloride ion concentration tester 14 in the corrosion tank are monitoring devices, which play the role of monitoring and transmitting signals; in this embodiment, at least two temperature sensors are arranged in the corrosion tank, and at least one temperature sensor is arranged at the top and bottom of the corrosion tank. The control cabinet obtains the detection signals of the temperature sensor, the first liquid level sensor, and the chloride ion concentration tester, and controls the corresponding water replenishing assembly, temperature control assembly, and feeding assembly to operate, so as to ensure the stability of the simulated environment in the corrosion tank.

[0060] As Figure 7 shown in the figure, the adjustment unit in the above structure is used to install the chloride ion concentration tester on the inner wall of the corrosion tank. The adjustment unit includes a fixing plate 131, a sliding rod 133 parallel to the fixing plate 131, and a sliding ring 134. The fixing plate 131 is fixed on the inner wall of the corrosion tank through a fixing bolt 132; the sliding ring 134 is sleeved on the sliding rod 133, and a limiting bolt 135 for fixing the sliding ring on the sliding rod is arranged on the sliding ring 134, and a fixing ring for fixing the chloride ion concentration tester 14 is also arranged on the side of the sliding ring 134. The adjustment unit of the present application can adjust the position of the chloride ion concentration tester, so as to adapt to different cement-based materials and different liquid levels, and ensure the reliability of the solution concentration measurement data.

[0061] The stirring unit 15 can ensure that the solution concentration is uniform after adding the corrosion agent, and can also effectively stir and mix when the upper and lower temperatures of the solution are inconsistent, so that the upper and lower temperatures are the same, obtain the accurate solution temperature, and provide a constant temperature environment. Two structural forms of the stirring unit are given in this embodiment. The stirring unit includes stirring blades and a stirring motor arranged on the side wall of the corrosion tank; or the stirring unit includes a plurality of water inlet holes arranged at the bottom of the corrosion tank, a plurality of water outlet holes arranged at the top of the corrosion tank, a fourth driving pump arranged between the water inlet holes and the water outlet holes, and a connecting pipe.

[0062] The stirring unit can effectively achieve the uniformity of the solution concentration and temperature in the corrosion tank, avoiding the failure of the simulation environment caused by the temperature difference between the upper and lower layers. The stirring unit can also achieve rapid and uniform stirring during the cleaning stage, feeding and mixing stage, heating stage, cooling stage, etc., ensuring the accuracy of the signals obtained by each sensor and avoiding the misoperation of the corresponding water replenishing component, temperature control component or feeding component due to the detection error of the sensor signal. When mixing the corrosion agent and water, adjusting the temperature, adjusting the concentration, and cleaning the corrosion tank in the corrosion tank, the control cabinet drives the stirring unit to start. When the stirring unit is working, the first liquid level sensor stops working. Therefore, when mixing the initial corrosion agent and water, and adjusting the temperature and concentration, the stirring unit needs to act synchronously.

[0063] As Figure 11 shown, the water level control in the corrosion tank: A water replenishing component is provided between each water storage tank and the corrosion tank, and the water replenishing component is used to quantitatively replenish water into the corrosion tank. The water replenishing component includes a third driving pump and a corrosion tank water replenishing pipeline connecting the water storage tank and the corrosion tank. The third driving pump is used to pump the water in the water storage tank into the corrosion tank through the corrosion tank water replenishing pipeline. The third driving pump and the corrosion tank water replenishing pipeline of the present application can adjust the liquid level in the corrosion tank, avoiding the liquid level being too low due to evaporation, resulting in incomplete local erosion of the cement-based material specimen and causing distortion of the test data.

[0064] When the first liquid level sensor monitors that the liquid level of the corrosion tank decreases, the control cabinet obtains the signal of the first liquid level sensor and controls the water replenishing component to quantitatively supplement the water in the water storage tank into the corrosion tank. When the first liquid level sensor monitors that the liquid level in the corrosion tank returns to the set value, the control cabinet controls the water replenishing component to stop operating.

[0065] As Figure 12 shown, the concentration control in the corrosion tank: As Figure 6As shown in the figure, the feeding assembly is arranged at the top or side of the corrosion tank. The feeding assembly is used to quantitatively add materials into the corrosion tank. The feeding assembly 16 is composed of a hopper 161, a hopper cover 162, a hopper discharge port 163, a second control valve 164, a weighing box 165, a pressure sensor 166, a third control valve 167, a weighing box discharge port 168 and a belt conveyor 169. The hopper discharge port 163 is directly above the weighing box 165, and the weighing box discharge port 168 is directly above the belt conveyor 169. The belt conveyor 169 can transport the corrosive agent into the corrosion tank. Both the second control valve and the third control valve are solenoid valves. The control system calculates the mass of the corrosive agent to be added, obtains the required amount of the corrosive agent through the pressure sensor 166, and then transports it into the corrosion tank through the belt conveyor 169. The conveyor belt in this application can also be replaced with a screw conveyor. The feeding assembly of this application can achieve automatic blanking, automatic weighing and automatic feeding, realizing the orderly and precise control of the feeding amount, providing effective technical support for the adjustment of the solution concentration. The consistency of the solution concentration is a crucial link in the whole test process.

[0066] When the chloride ion concentration tester monitors that the solution concentration in the corrosion tank decreases, the control cabinet obtains the signal of the chloride ion concentration tester, determines the addition amount of the corrosive agent, and controls the feeding assembly to quantitatively feed materials into the corrosion tank; the stirring unit starts and stops stirring after a certain time. When the feeding assembly performs the feeding action, the control cabinet controls the second control valve to open, and the corrosive agent is fed from the hopper into the weighing box. After the pressure sensor detects that the weight in the weighing box reaches the set value, the second control valve closes, and the third control valve and the conveyor start to feed.

[0067] As Figure 10As shown in the figure, the temperature control inside the corrosion tank: The temperature control component is used to adjust the temperature of the solution inside the corrosion tank; the temperature control component includes a heating plate 17 and a chiller 5. The heating plate 17 is arranged at the bottom of the corrosion tank. Support columns 171 are arranged around the heating plate, and a protection plate 172 is arranged on the top of the support columns and above the heating plate. A refrigerator is arranged inside the chiller 5. A first circulating inlet pipe 614, a first circulating outlet pipe 615 and a first driving pump are arranged between the chiller and the corrosion tank. The first driving pump is used to pump the solution inside the corrosion tank into the chiller and pump it back into the corrosion tank after cooling. The chiller 5 is an ordinary industrial chiller and a liquid level sensor is installed inside. The function of the chiller 5 is to reduce the temperature of the solution inside the corrosion tank and ensure that the solution temperature does not exceed the set corrosion environment temperature. Through the setting of the heating plate in this application, the temperature inside the corrosion tank can be adjusted when the external environmental temperature is relatively low; through the setting of the chiller, the temperature inside the corrosion tank can be adjusted when the external environmental temperature is relatively high, so as to simulate the erosion effect at a corresponding specific temperature. In this application, when multiple corrosion tanks are set, the temperature of different corrosion tanks can be effectively controlled, so that the erosion conditions under multiple temperature conditions can be tested simultaneously, so as to obtain a more effective data combination, which is convenient for the accurate analysis of the performance of cement-based materials.

[0068] There are at least two temperature sensors inside the corrosion tank. At least one temperature sensor is arranged at the top and bottom of the corrosion tank; when the temperatures detected by two of the temperature sensors are inconsistent, the stirring unit starts until the values monitored by the temperature sensors are the same; when the temperature sensor monitors that the temperature of the solution inside the corrosion tank is too high or too low, the control cabinet obtains the signal of the temperature sensor and controls the temperature control component and the stirring unit to act to adjust the solution temperature. When the temperature of the solution inside the corrosion tank is too low, the control cabinet obtains the temperature signal of the temperature sensor and the heating plate works; when the temperature of the solution inside the corrosion tank is too high, the control cabinet obtains the temperature signal of the temperature sensor and controls the refrigerator and the first driving pump to act. The first driving pump pumps the solution inside the corrosion tank into the chiller for refrigeration and then sends it back to the corrosion tank.

[0069] A cleaning component is arranged between the chiller and the water storage tank. The cleaning component includes a second driving pump and a cleaning pipeline connecting the chiller and the water storage tank. A sewage discharge pipe is arranged at the bottom of the chiller, or a sewage discharge pipe is branched from the first circulating outlet pipe. The second driving pump is used to pump the water in the water storage tank into the chiller through the cleaning pipeline. After the temperature inside the corrosion tank is adjusted by the chiller, the second driving pump is started to clean the chiller.

[0070] The cleaning component of the present application can achieve the cleaning of the inside of the chiller, avoiding the erosion of the residual solution on the inside of the chiller after cooling the solution in the corrosion tank, and preventing the reduction of the service life of the chiller; at the same time, it can also prevent the residual solution in the current corrosion tank from affecting the solution concentration in other corrosion tanks, making the test data more reliable, and reducing the frequency of concentration adjustment of the entire testing machine during the immersion age period.

[0071] After the cement-based material specimen is taken out, the corrosion tank and the chiller are cleaned. The water pump in the water storage tank is sent to the corrosion tank through the water replenishing component. After the water in the corrosion tank enters the chiller through the first circulation inlet pipe, it is discharged through the drain pipe at the bottom of the chiller or through the drain pipe provided on the first circulation outlet pipe.

[0072] Pipeline connection structure:

[0073] Refer to Figure 2 and Figure 3 , the first corrosion tank 1, the second corrosion tank 2 and the third corrosion tank 3 are in a parallel relationship. A main water outlet pipeline 611 of the water storage tank 4 is provided, and the main water outlet pipeline 611 of the water storage tank is communicated with each corrosion tank through a corrosion tank water replenishing pipeline 612, and an electromagnetic control valve is provided on each corrosion tank water replenishing pipeline 612. A chiller water replenishing pipeline 613 is provided between the main water outlet pipeline 611 of the water storage tank and the chiller 5, and an electromagnetic control valve is also provided on the chiller water replenishing pipeline 613. The chiller water replenishing pipeline 613 here is also the cleaning pipeline of the cleaning component in the above text.

[0074] One end of the first circulation inlet pipe 614 is connected to the chiller water inlet 51, and the other end of the first circulation inlet pipe is respectively connected to the corrosion tank water outlet 181 of each corrosion tank through a plurality of corrosion tank water outlet pipelines 616. One end of the first circulation outlet pipe is connected to the chiller water outlet 52, and the other end of the first circulation outlet pipe is connected to the corrosion tank water inlet 182 of the corrosion tank through a plurality of corrosion tank water inlet pipelines 617.

[0075] In the above pipelines, the corrosion tank water replenishing pipeline 612 can be separately connected to the corrosion tank water replenishing port provided on the corrosion tank or to the corrosion tank water inlet 182. The chiller water replenishing pipeline 613 is connected to the chiller water inlet 51. When arranging the pipelines, in order to reduce the pipeline length, the corrosion tank water replenishing pipeline 612 and the first circulation outlet pipe 615 can be combined and connected to the corrosion tank water inlet at an appropriate position, and the chiller water replenishing pipeline 613 and the first circulation inlet pipe 614 can be combined and connected to the chiller water inlet.

[0076] The water inside the chiller 5 can be drained by setting a drain pipe on the chiller or by connecting a branch pipe to the first circulation outlet pipe. A number of solenoid valves are provided in this pipeline system to cut off and conduct different pipelines, avoiding interference between pipelines, and effectively controlling the actions of the solenoid valve groups on different pipelines through the control cabinet.

[0077] The working principle in specific applications will be described below in combination with the specific structure for the actions of the corresponding pipelines and control valves in different technological steps:

[0078] Turn on the control system of the control cabinet 7 and set the first set water level and the second set water level of the water storage tank; set the set liquid level, set temperature, set value of chloride ion concentration, total volume of test pieces, and immersion age of each corrosion tank.

[0079] Water level control process of the water storage tank 4: After the water level in the water storage tank 4 is lower than the first set water level of the water storage tank, the lower limit liquid level sensor transmits a signal to the control cabinet 7, and the control cabinet 7 automatically opens the corresponding first control valve 44, and the water storage tank 4 is filled with water. After the water level reaches the second set water level of the water storage tank, the upper limit liquid level sensor transmits a signal to the control cabinet 7, and the control cabinet 7 automatically closes the first control valve 44, and the water addition is completed.

[0080] Temperature control process of the corrosion tank: If the solution temperature in the corrosion tank is lower than the set temperature of the corrosion tank, the temperature sensor 11 transmits a signal to the control cabinet 7, and the control cabinet 7 automatically turns on the heating plate 17 and the stirring unit. When the temperature reaches the set temperature of the corrosion tank, the control cabinet 7 automatically stops the heating plate 17 from working; if the solution temperature in the corrosion tank is higher than the set temperature of the corrosion tank, the temperature sensor 11 transmits a signal to the control cabinet 7, and the control cabinet 7 automatically turns on the solenoid valves on the first circulating outlet pipe and the first circulating inlet pipe, so that the pipeline between the corrosion tank and the chiller is conducted, and the chiller 5 works to reduce the solution temperature in the corrosion tank; when the temperature reaches the set temperature of the corrosion tank, the control cabinet 7 first automatically closes the solenoid valve on the first circulating inlet pipe. After all the solution in the chiller 5 is pumped into the corrosion tank, the liquid level sensor in the chiller 5 transmits a signal to the control cabinet 7, and the solenoid valve on the first circulating outlet pipe automatically closes. At the same time, the chiller performs self-cleaning. The solenoid valve on the chiller water replenishment pipe and the solenoid valve on the drain pipe are opened, and the water in the water storage tank 4 is used to clean the inside of the chiller 5. The opening duration of the chiller self-cleaning is set. After cleaning, the water in the chiller 5 is drained through the drain pipe. In the figure of this application, the drain pipe 618 is integrated into the first circulating outlet pipe. When the liquid level sensor in the chiller transmits a signal, the solenoid valve on the chiller water replenishment pipe and the solenoid valve on the drain pipe automatically close. The purpose of cleaning the chiller 5 is to avoid the change of the chloride ion concentration in the corrosion tank by cleaning with clean water every time the chiller 5 works when the chloride ion concentrations in different corrosion tanks are different. The temperature sensor 11 is arranged at least one on the upper and lower inner side walls of each corrosion tank respectively. When the measured values of the temperatures of the upper and lower two temperature sensors differ beyond the set value, the stirring unit is started. When the measured values of the temperatures of the two temperature sensors differ within the set value, the above temperature control process is started to restore the temperature in the corrosion tank to the set value.

[0081] Liquid level control process of the corrosion tank: Cement-based material specimens are placed in the corrosion tank, and the water inlet switch is opened. After the liquid level reaches the set liquid level of the corrosion tank, the first liquid level sensor 12 of the corrosion tank transmits a signal to the control cabinet 7, and the water addition is automatically stopped. During the soaking of the specimens, if the liquid level is lower than the set liquid level of the corrosion tank, the first liquid level sensor 12 automatically opens the solenoid valve on the corrosion tank water replenishment pipe through the control cabinet 7 to realize water replenishment. When the set liquid level of the corrosion tank is reached, the solenoid valve on the corrosion tank water replenishment pipe automatically closes.

[0082] Solution concentration control process of the corrosion tank: If the chloride ion concentration in the corrosion tank is lower than the set value of the chloride ion concentration in the corrosion tank, the chloride ion concentration tester 14 will transmit the concentration value to the control cabinet 7. The automatic control system calculates the mass of the corrosion agent to be added based on the set liquid level of the corrosion tank and the total volume of the test pieces. After the calculation is completed, the control cabinet 7 automatically opens the second control valve 164. After the mass of the corrosion agent in the weighing box 165 reaches the calculated value, the control cabinet 7 automatically closes the second control valve 164, opens the third control valve 167, the belt conveyor 169, and the stirring unit 15. The working duration of the weighing box solenoid valve, the belt conveyor 169, and the stirring unit 15 is preset. After the weighing box solenoid valve, the belt conveyor 169, and the stirring unit 15 reach the working duration, they stop operating. The function of the stirring unit 15 is to make the corrosion agent dissolve better in the solution and promote the circulation of water by stirring to ensure a constant temperature. During the operation of the stirring unit 15, the first liquid level sensor 12 stops working. After the stirring unit finishes working, the liquid level sensor in the corrosion tank resumes working.

[0083] External discharged solution control process of the corrosion tank: After the test pieces in the corrosion tank reach the soaking age, the control cabinet 7 controls the solenoid valves on the first circulating water inlet pipe 614, the corrosion tank outlet pipe 616, and the drain pipe of the chiller to open, and the solution is discharged after passing through the chiller. Or a drainage branch pipe of the corrosion tank is provided on the corrosion tank outlet pipe 616, and the solenoid valve on the drainage branch pipe is opened, and the solution is directly discharged without passing through the chiller; when the liquid level of the solution in the corrosion tank is zero, if the solution is not discharged through the chiller, the first liquid level sensor 12 of the corrosion tank transmits a signal to the control cabinet 7, and the control cabinet 7 closes the solenoid valves on the corrosion tank outlet pipe 616 and the drainage branch pipe. If the solution in the corrosion tank is discharged through the chiller, the self-cleaning of the chiller is started, the solenoid valve on the water replenishing pipe of the chiller and the solenoid valve on the drain pipe are opened, and the water in the storage tank 4 is used to clean the inside of the chiller 5. The opening duration of the self-cleaning of the chiller is set, and after cleaning, the water in the chiller 5 is drained through the drain pipe. Open the tank cover and take out the cement-based material test pieces, and the entire soaking test is completed.

[0084] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process, which should be understood by those skilled in the technical field to which the embodiments of the present application belong.

[0085] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of the above embodiments can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0086] Finally, it should be noted that although the embodiments of the present application have been shown and described above, the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for accelerating the simulation test of chloride erosion of cement-based materials, characterized in that, Carry out a simulation test using a chloride salt erosion acceleration simulation test machine for cement-based materials. The chloride salt erosion acceleration simulation test machine for cement-based materials includes a corrosion chamber, a water storage tank, a temperature control component, a feeding component, and a control cabinet; A water inlet pipe for the water storage tank is provided on the water storage tank. A first control valve is provided on the water inlet pipe for the water storage tank. A water replenishing component is provided between the water storage tank and the corrosion chamber. The water replenishing component is used to quantitatively replenish water into the corrosion chamber; the temperature control component is used to adjust the temperature of the solution in the corrosion chamber; the feeding component is arranged at the top or side of the corrosion chamber, and the feeding component is used to quantitatively add materials into the corrosion chamber; A temperature sensor, a first liquid level sensor, and a chloride ion concentration tester are arranged in the corrosion chamber. The control cabinet is used to obtain the detection signals of the temperature sensor, the first liquid level sensor, and the chloride ion concentration tester, and control the corresponding water replenishing component, temperature control component, and feeding component to act; The chloride salt erosion acceleration simulation test method for cement-based materials includes: assembling a chloride salt erosion acceleration simulation test machine for cement-based materials, and obtaining the water injection volume and the addition amount of the corrosion agent in the corrosion chamber according to the volume of the cement-based material specimen and the solution concentration in the corrosion chamber; controlling the water level height in the water storage tank through the control cabinet, and quantitatively injecting water from the water storage tank into the corrosion chamber. At the same time, controlling the feeding component to quantitatively add the corrosion agent into the corrosion chamber through the control cabinet; starting the temperature control component, adjusting the temperature of the solution in the corrosion chamber to the set value, and after the temperature and concentration of the solution in the corrosion chamber reach the set value, putting in the cement-based material specimen; Monitoring the signal data of the temperature sensor, the first liquid level sensor, and the chloride ion concentration tester, and obtaining the temperature signal, liquid level signal, and concentration signal of the solution in the corrosion chamber in real time; when the temperature signal, liquid level signal, or concentration signal changes, the control cabinet obtains the corresponding signal and controls the corresponding water replenishing component, temperature control component, or feeding component to adjust; When the chloride ion concentration tester monitors that the solution concentration in the corrosion chamber decreases, the control cabinet obtains the signal of the chloride ion concentration tester, determines the addition amount of the corrosion agent, and controls the feeding component to quantitatively add materials into the corrosion chamber; When the temperature sensor monitors that the solution temperature in the corrosion chamber is too high or too low, the control cabinet obtains the signal of the temperature sensor and controls the temperature control component to act to adjust the solution temperature; After reaching the set immersion age, the control cabinet controls the corrosion chamber to drain the solution and takes out the cement-based material specimen; The temperature control component includes a chiller. A refrigerator is arranged in the chiller. A first circulating inlet pipe, a first circulating outlet pipe, and a first driving pump are arranged between the chiller and the corrosion chamber. The first driving pump is used to pump the solution in the corrosion chamber into the chiller and pump it back into the corrosion chamber after cooling; A cleaning component is arranged between the water storage tank and the chiller. The cleaning component includes a second driving pump and a cleaning pipeline connecting the chiller and the water storage tank. A sewage pipe is arranged at the bottom of the chiller, or a sewage pipe branches out from the first circulating water outlet pipe. The second driving pump is used to pump the water in the water storage tank into the chiller through the cleaning pipeline. After the temperature in the corrosion tank is adjusted by the chiller, the second driving pump is started to clean the chiller.

2. The method for accelerating the simulation test of chloride erosion of cement-based materials according to claim 1, characterized in that, A lower limit liquid level sensor and an upper limit liquid level sensor are arranged in the water storage tank. When the liquid level in the water storage tank drops to the lower limit liquid level sensor, the control cabinet obtains the signal of the lower limit liquid level sensor and controls the first control valve on the water inlet pipe of the water storage tank to open. When the liquid level rises to the upper limit liquid level sensor, the control cabinet obtains the signal of the upper limit liquid level sensor and controls the first control valve on the water inlet pipe of the water storage tank to close.

3. The accelerated simulation test method for chloride erosion of cement-based materials according to claim 1, wherein, When the first liquid level sensor monitors that the liquid level in the corrosion tank decreases, the control cabinet obtains the signal of the first liquid level sensor and controls the water replenishing component to quantitatively replenish the water in the water storage tank into the corrosion tank. When the first liquid level sensor monitors that the liquid level in the corrosion tank returns to the set value, the control cabinet controls the water replenishing component to stop operating.

4. The method for accelerating the simulation test of chloride erosion of cement-based materials according to any one of claims 1-3, characterized in that, It also includes a stirring unit. The stirring unit includes stirring blades and a stirring motor arranged on the side wall of the corrosion tank; or the stirring unit includes a plurality of water inlet holes arranged at the bottom of the corrosion tank, a plurality of water outlet holes arranged at the top of the corrosion tank, a fourth driving pump and a communicating pipe arranged between the water inlet hole and the water outlet hole; When mixing the corrosive agent and water, adjusting the temperature, adjusting the concentration, and cleaning the corrosion tank in the corrosion tank, the control cabinet drives the stirring unit to start. When the stirring unit is working, the first liquid level sensor stops working.

5. The method for accelerating the simulation test of chloride erosion of cement-based materials according to claim 1, wherein, The feeding component includes a hopper, a second control valve arranged at the discharge port of the hopper, a weighing box, and a conveyor. The weighing box is correspondingly arranged below the discharge port of the hopper. A pressure sensor is arranged at the bottom of the weighing box, and a third control valve is arranged at the discharge port at the bottom of the weighing box; The conveyor is correspondingly arranged below the discharge port of the weighing box, and the conveyor is used to convey the materials falling in the weighing box into the corrosion tank; When the feeding component performs the feeding action, the control cabinet controls the second control valve to open, and the corrosive agent is fed from the hopper into the weighing box. After the pressure sensor detects that the weight in the weighing box reaches the set value, the second control valve closes, and the third control valve and the conveyor start feeding.

6. The method for accelerating the simulation test of chloride erosion of cement-based materials according to claim 4, characterized in that There are at least two temperature sensors in the corrosion tank, and at least one temperature sensor is arranged at the top and bottom of the corrosion tank; When the temperatures detected by two of the temperature sensors are inconsistent, the stirring unit starts until the values monitored by the temperature sensors are the same.

7. The method for accelerating the simulation test of chloride erosion of cement-based materials according to claim 1, wherein, The temperature control component also includes a heating plate. The heating plate is arranged at the bottom of the corrosion tank. Support columns are arranged around the heating plate, and a protection plate placed above the heating plate is arranged at the top of the support columns; When the temperature of the solution in the corrosion tank is too low, the control cabinet obtains the temperature signal of the temperature sensor and the heating plate works; When the solution temperature in the corrosion tank is too high, the control cabinet obtains the temperature signal of the temperature sensor and controls the operation of the cooler and the first drive pump. The first drive pump pumps the solution in the corrosion tank into the chiller for refrigeration and cooling, and then sends it back to the corrosion tank.

8. The method for accelerating the simulation test of chloride salt erosion of cement-based materials according to claim 7, wherein After the cement-based material specimen is taken out, the corrosion tank and the chiller are cleaned. The water pump in the water storage tank is sent to the corrosion tank through the water replenishment component. After the water in the corrosion tank enters the chiller through the first circulating inlet pipe, it is discharged through the drain pipe at the bottom of the chiller or through the drain pipe provided on the first circulating outlet pipe.

9. The method for accelerating the simulation test of chloride erosion of cement-based materials according to claim 1, characterized in that The cement-based material chloride salt erosion acceleration simulation test machine includes at least two corrosion tanks. A water replenishment component is provided between the water storage tank and each corrosion tank, and the control cabinet controls each corrosion tank to work independently.

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