Integrated multi-environment simulation concrete durability accelerated test system

Abstract

The application relates to an integrated multi-environment simulation concrete durability accelerated test system and belongs to the technical field of concrete durability. The system comprises a central control system, a box body and a power line. The box body comprises an external metal box body, a power plug, an internal test box, a liquid storage tank, a vacuum water pump, a moving slide rail of the test box, a condenser, a humidifier, an air exchange fan, an ultraviolet lamp and an internal integrated circuit. The test wall is a separated cavity cuboid, a complete wall body is divided into multiple groups of different size compartments, space utilization is achieved, and the test requirements of test blocks under different sizes, different constituent materials and different curing conditions are achieved. The application realizes laboratory simulation of actual engineering application environment, so that the obtained data and results have higher practical reference value. The application can accelerate the test process, shorten the test time, overcome the long durability test period defect, and reduce the space and time waste in the present concrete durability research.

Description

Technical Field

[0001] This invention belongs to the field of concrete durability technology and relates to an integrated multi-environment simulation concrete durability accelerated testing system. Background Technology

[0002] Concrete is widely used as a structural material in infrastructure and public facilities construction, and is one of the most widely used materials in the construction industry. Its durability is directly related to public safety. It is not only used in industrial and civil buildings, roads, bridges, and water conservancy projects, but also increasingly in complex industrial environments such as marine areas, frigid regions, and chemically corrosive environments, as well as in special buildings. Environmental degradation has severely impacted the durability of concrete structures, revealing many new and noteworthy problems during construction and service. Among these, insufficient durability of concrete structures leads to high costs for reinforcement and maintenance, and early cracking of concrete causes structural performance degradation, which is particularly serious. The durability, early cracking, and crack control of concrete structures are not only related to the intrinsic properties of the material, but are also controlled by changes in various environmental parameters (temperature, humidity, etc.). However, conducting on-site concrete durability tests is time-consuming, costly, and difficult to implement. Therefore, it is necessary to create indoor simulated environments for long-term or accelerated simulation studies of concrete durability and the mechanisms of structural cracking.

[0003] A significant factor affecting the durability of concrete structures is the corrosive effect of harmful ions, among which sulfate, chloride, hydrogen, hydroxide, and magnesium ions are commonly involved. Freeze-thaw cycles also influence the durability of concrete structures. Research on sulfate corrosion of concrete in my country began in the early 1950s, primarily focusing on experimental methods and mechanisms of sulfate resistance. Sulfate ions penetrate from the external environment into the concrete, reacting chemically with certain components and causing corrosion.

[0004] Because the ion erosion process takes a long time in real life, electroosmotic pulses are currently mainly used in the laboratory to simulate prolonged use in real life. Electroosmotic pulse technology utilizes the principle of electroosmosis to generate a potential difference between the anode and cathode of an external power supply. Under the action of a positive voltage pulse, cations drive water molecules to flow through the bonding interface towards the cathode, thereby accelerating the test.

[0005] However, the designs of related patents do not fully consider the space wastage problem in current concrete testing. They cannot simultaneously consider the impact of parameters such as different specimen sizes, mix proportions, admixtures, additives, cementitious materials, and different external corrosive environments on concrete durability. Our patent design takes into account the accelerated durability testing of concrete specimens while simulating the effects of actual environmental factors on the specimens as comprehensively as possible. It innovatively proposes simultaneously subjecting specimens of different sizes, quantities, compositions, and curing conditions to the same testing conditions, greatly avoiding experimental errors that may be caused by different testing conditions. Furthermore, it creatively reduces the space wastage in current concrete durability research equipment and shortens the testing cycle.

[0006] Studies have shown that factors influencing erosion include both intrinsic concrete factors and environmental factors. These factors can alter material properties, including cement composition, water-cement ratio, type and quantity of admixtures, type, content and grade of additives, fineness modulus and particle size distribution of sand, concentration and type of eroding solution, pH value, and temperature. Numerous internal and external factors have an impact. The concrete's own components have a significant influence on sulfate erosion. Many scholars both domestically and internationally have studied the erosion of concrete containing admixtures, including fly ash, silica fume, slag, limestone powder, nano-calcium carbonate, natural zeolite, metakaolin, pozzolanic composites, waste plastics, and short basalt fibers. Previous indoor testing of concrete durability did not consider the coupling effects of multiple environmental factors and the concrete's own components, leading to a disconnect between indoor research and practical applications. Therefore, it is imperative to analyze the durability of concrete under the coupled effects of internal and external factors in the laboratory for effective utilization.

[0007] Because different types and quantities of admixtures and additives in concrete make it extremely difficult to conduct tests with different mix proportions using experimental methods, and the separation of concrete specimen preparation and curing processes results in low utilization of the test area, coupled with the enormous workload and long cycle of durability testing, and the limited space utilization and uniform specimen size in a single test, further complicates the situation. Furthermore, current environmental simulation laboratories cannot simultaneously apply the same effects to specimens with different materials and curing conditions, and do not consider the coupling effects of multiple environmental factors and the concrete's own components, leading to a disconnect between indoor experimental research and practical applications. Therefore, to meet the needs of general research and application units, and to comprehensively and efficiently detect the impact of multiple environmental factors on the durability of concrete specimens while reducing the waste of test area, it is necessary to develop an integrated multi-environment simulation accelerated concrete durability testing system to improve testing efficiency and reduce resource waste. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide an integrated multi-environment simulation concrete durability accelerated testing system to prepare concrete durability test specimens with different constituent materials, different sizes, and different curing conditions, and to conduct multiple durability coupled accelerated experiments on different concretes simultaneously.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An integrated multi-environment simulation concrete durability accelerated testing system includes a housing, a central control system for adjusting and controlling the physical parameters inside the housing, and a test chamber installed inside the housing for conducting concrete durability tests.

[0011] The test chamber includes a test wall with several compartments inside. Each compartment has a wall, and a slide rail is located below the wall, allowing the wall to slide on the slide rail. A test mold base plate is located at the bottom of the wall, and two opposing rotating partitions are rotatably arranged above the test mold base plate. The rotation of the rotating partitions is controlled by a central control system. Grooves are provided on both sides of the wall. When the rotating partitions rotate to be parallel to the test mold base plate, they smoothly connect with the grooves. When the rotating partitions rotate to be perpendicular to the test mold base plate, the rotating partitions and the wall form a sealed space.

[0012] Optionally, the central control system includes a display screen, a control panel, and an internal integrated circuit; it also includes a condenser, a humidifier, a ventilation fan, an ultraviolet lamp, a heating blanket, a carbon dioxide jet device, and a liquid storage tank installed inside the chamber. The test chamber is provided with a solution holding area, and the liquid storage tank is injected into the solution holding area through a liquid delivery pipeline installed on the test chamber.

[0013] Optionally, the physical parameters controlled by the central control system include carbon dioxide concentration, temperature, humidity, ultraviolet intensity, addition / replacement / removal of solution in the test chamber, opening and closing of the internal electric field accelerated corrosion device, type of electric field, voltage magnitude and frequency, and selection of raw materials for the test specimen.

[0014] Optionally, the storage tank contains a corrosive solution, including one or more of sodium sulfate, magnesium sulfate, magnesium chloride, calcium sulfate, sodium chloride, sulfuric acid, hydrochloric acid, nitric acid, and sodium hydroxide.

[0015] Optionally, the chamber is equipped with a vacuum pump, which is connected to the infusion pipeline to collect the solution.

[0016] Optionally, an AC frequency converter power supply is provided on the outer surface of the test chamber, and the AC frequency converter power supply is controlled by the central control system to control the electric field to conduct accelerated ion erosion experiments.

[0017] Optionally, the test wall is a cuboid with segmented cavities, and the rotating partitions between each row and column are hollow, with built-in wires that connect to temperature and humidity, ultraviolet intensity, electric field intensity sensors, heating blankets, and slide rails, forming a complete circuit.

[0018] Optionally, a material feeding nozzle is installed in the wall above the compartment to automatically pour concrete into different compartments; the material feeding nozzle is connected to a concrete feeding pump device, which realizes the automated delivery of mixtures of different components to each compartment, and at the same time conducts tests on different types of materials.

[0019] Optionally, the wall is used to vibrate the specimen during specimen preparation by moving it on a slide rail; at the end of the test, it is moved to the edge of the box via the slide rail to retrieve and place the specimen.

[0020] Optionally, an adsorbent material is injected into the groove to prevent the solutions in different compartments from permeating each other.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The device of the present invention adopts an overall test wall with a segmented design. The mold is cured until the mortar is completely solidified before demolding. Moreover, the demolding does not require the mold to be disassembled separately, which does not affect the shape or strength of the sample and reduces the waste of test space.

[0023] 2. The device of the present invention can simultaneously conduct durability tests on concrete containing different types and grades of cement and different water-cement ratios, study the effects of different cements and different water-cement ratios on concrete durability, and improve the speed of concrete durability testing.

[0024] 3. The device of the present invention can simultaneously conduct durability tests on concrete containing different admixtures and additives, study the effects of different admixtures and additives on concrete durability, and improve the speed of concrete durability testing;

[0025] 4. The device of the present invention can use different types, voltages, and frequencies of external electric fields to conduct accelerated tests, thereby improving the speed of concrete durability testing;

[0026] 5. The device of the present invention can simultaneously perform curing of specimens under multiple different curing conditions, study the influence of different curing conditions on concrete durability, and improve the speed of concrete durability testing;

[0027] 6. The device of the present invention can perform vacuum water saturation and vacuum salt saturation treatment on concrete before testing, thereby accelerating the speed of concrete durability testing;

[0028] 7. The device of the present invention can simultaneously prepare specimens of various sizes to study the influence of size effect on concrete durability. The prepared specimens can undergo multiple mechanical tests such as flexural strength test, bending strength test, and shear strength test.

[0029] 8. In addition to preparing specimens, the device of the present invention can also conduct durability tests on concrete. By adding different types of solutions, different types of durability tests can be conducted, such as concrete resistance to sulfate attack and resistance to chloride attack.

[0030] 9. The device of this invention can study the effects of external environment on high temperature, low temperature, freeze-thaw cycle, wet-dry cycle, ultraviolet radiation, carbon dioxide gas and multiple factors acting simultaneously, and study the durability of concrete under different external environments.

[0031] 10. The device of the present invention is reusable, and the damaged parts can be easily replaced even if some of them are damaged;

[0032] 11. The device of this invention adopts a wall-divided design, which can save more experimental space;

[0033] 12. The device of the present invention adopts a system control method, which can simulate different environments such as humidity, temperature, and electric field for the specimens, and has functions such as automatic liquid injection and automatic temperature and humidity control, so as to realize the automation of concrete durability specimen preparation, curing and testing.

[0034] 13. This invention significantly saves experimental space. The partitioned wall design meets the testing needs of specimens of different sizes. Temperature and humidity are automatically controlled, and the use of a novel heating blanket for temperature control effectively ensures heating speed and insulation effect, achieving automation of specimen preparation and curing. This invention greatly improves the utilization rate of experimental space and the flexibility to adapt to different experimental types, integrating different experimental needs such as preparation, curing, sulfate resistance testing, and chloride resistance testing, achieving automated monitoring and processing of the entire experimental process.

[0035] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0037] Figure 1 A complete diagram of the device;

[0038] Figure 2 This is a diagram of the interior of the cubicle;

[0039] Figure 3 Perspective view of the test wall;

[0040] Figure 4 This is a schematic diagram of the test wall;

[0041] Figure 5 This is a schematic diagram illustrating the erosion accelerated by electric current.

[0042] Figure reference numerals: 1. Central control system; 2. Chamber; 3. Test chamber; 4. Power cord; 5. Display screen; 6. Control panel; 7. Ventilation fan; 8. Condenser; 9. Liquid storage tank; 10. Humidifier; 11. Moving slide rail; 12. Test wall; 13. Ultraviolet lamp; 14. Vacuum water pump; 15. Feeding nozzle; 16. Rotating partition; 17. Test mold base plate; 18. Groove; 19. Heating blanket; 20. Slide rail; 21. Sensor; 22. Rotating shaft; 23. AC frequency converter power supply; 24. Solution holding area; 25. Carbon dioxide jet device; 26. Infusion pipeline. Detailed Implementation

[0043] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] Please see Figures 1-5 This invention discloses a system for producing and testing specimens of concrete repair agents and conducting durability tests, comprising a central control system 1, a housing 2, and a test chamber 3. The central control system 1 includes a display screen 5, a control panel 6, and internal integrated circuitry. The display screen 5 displays various real-time physical parameters inside the housing 2, including the temperature, humidity, pH value, ultraviolet intensity, and internal electric field strength of each specimen. The parameters on the display screen 5 are derived from temperature and humidity sensors, ultraviolet intensity sensors, and internal electric field strength sensors embedded within the test chamber. The control panel 6 can adjust the required physical parameters for different specimens, control the automatic addition of solution, control the nozzle for feeding, change the automatic curing conditions of the specimens, and open / close the internal electric field acceleration device.

[0047] The chamber 2 includes an external metal chamber 2 and a power plug, and an internal test chamber 3, a liquid storage tank 9, a vacuum water pump 14, a sliding rail 11 for the test chamber 3, a condenser 8, a humidifier 10, a ventilation fan 7, an ultraviolet lamp 13, a temperature and humidity sensor 21, and an internal integrated circuit. Through the central control system 1, various commands from external operation are input to adjust the environmental conditions inside the chamber 2, such as temperature, humidity, ultraviolet intensity, and types of corrosive ions in the test chamber 3, as needed. The vacuum water pump 14 can perform vacuum saturation and vacuum salt saturation treatment on the concrete before the concrete test, thereby accelerating the durability test speed of the concrete.

[0048] The storage tank 9 contains solutions that are corrosive to concrete, such as sodium sulfate, magnesium sulfate, magnesium chloride, calcium sulfate, sodium chloride, sulfuric acid, hydrochloric acid, nitric acid, and sodium hydroxide. The central control system 1 controls the corresponding solutions to be injected into the solution holding area 24 of the test chamber 3 through the vacuum water pump 14 and the liquid delivery pipeline 26. At the same time, it also serves as a temporary storage of the solutions on both sides of the test chamber 3 when certain test blocks are picked up or put down, thus realizing the automation of liquid injection.

[0049] The test chamber 3 includes a test wall 12, a rotating partition 16, a mold base plate 17, a slide rail 20, a groove 18, an AC frequency converter power supply 23, a heating blanket 19 built into the wall, a feeding nozzle 15 and its delivery pipe, and temperature, humidity, ultraviolet, carbon dioxide, and electric field strength sensors 21. The AC frequency converter power supply 23 is installed on the outer surface of the test chamber 3, and its operation can be controlled by the central control system 1 to conduct electric field accelerated ion etching experiments. The test wall 12 is a hollow cuboid, designed with four areas according to different sample block sizes, and the samples are independent of each other, allowing for diversity in sample size, mix ratio, and curing conditions. The molds include four different sizes: 400×400×400mm, 150×150×150mm, 100×100×100mm, and 40×40×160mm.

[0050] The rotating partition 16 includes a first rotating partition and a second rotating partition within the test chamber. The rotating partition 16 can rotate 90°. When closed, it provides conditions for the molding of the test block; when open, it provides the necessary curing environment for the test block, and after curing, it allows the etching solution on both sides of the test chamber 3 to contact the test block for testing. It also facilitates the removal of the test block at the end of the test.

[0051] Each test cell within the test wall 12 is equipped with a slide rail 20, which allows the mold to move back and forth to vibrate the mixture. A heating blanket 19 is located inside the cavity of the wall below the test cell. The temperature of each heating blanket 19 can be individually controlled by the central control system 1 to meet the curing temperature requirements of different experiments, achieving automated temperature control. Furthermore, it can be used to study the effect of different temperatures on concrete durability by adjusting the heating blanket 19 to control the temperature of the durability test. An embedded feeding nozzle 15 is located in the center of the top wall surface of each test cell within the test wall 12, injecting the mixture into each mold. The pipe is located inside the cavity of the wall. Waterproof material is injected into the groove 18 of the slide rail 20 to prevent the cross-penetration of different solutions on both sides. Appropriate amounts of admixtures such as fly ash, slag, limestone powder, metakaolin, pozzolanic composites, silica fume, and zeolite powder can be added to the concrete mixture. This is used to study the effect of different admixtures on concrete durability.

[0052] Appropriate amounts of admixtures such as water-reducing agents, air-entraining agents, early-strength agents, retarders, expanding agents, and pumping agents can be added to concrete mixtures. These are used to study the effects of different admixtures on concrete durability. Research is conducted on concrete durability under different corrosive environments, considering the coupling of various conditions such as single-corrosive solutions (e.g., solutions containing only sulfates), dual-corrosive solutions (e.g., solutions containing both sulfates and chlorides), acidic environments, strongly alkaline environments, high-temperature environments, and ultraviolet environments. Based on experimental results, the influence of different corrosive environments on concrete mass loss and mechanical properties is obtained, thus revealing the durability characteristics of concrete under corrosive environments.

[0053] Carbon dioxide curing technology for concrete is a promising technology. It not only recovers, utilizes, and fixes carbon dioxide gas, but also has a significant impact on the sustainable development of the concrete industry and mitigating global climate change caused by greenhouse gas emissions. Compared to steam-cured concrete, carbon dioxide curing can recover, utilize, and fix carbon dioxide gas, thus mitigating greenhouse gas emissions; it can reduce energy consumption during the concrete curing process, saving energy; the later-stage strength development of concrete cured with carbon dioxide is significantly better than that cured with steam; and it can fix and seal toxic substances such as heavy metals. This invention includes a carbon dioxide jetting device 25, which can be used for carbon dioxide curing of concrete and can also be used to study the effect of carbon dioxide concentration on concrete durability.

[0054] The principle behind the accelerated corrosion caused by the current generated by the power supply is as follows: An AC frequency converter 23 is installed on the test wall, which is beneficial for conducting accelerated tests on concrete durability under the action of an electric field. The concrete deterioration process under the coexistence of an electric field and corrosive ions mainly involves two aspects: firstly, the electric field can accelerate the degradation of Ca in the pore solution of cementitious materials. 2+ and OH - Plasma etching causes ions in the mortar pore solution to migrate outwards under the influence of an electric field, Ca... 2+ Continuous dissolution causes the cement hydration products Ca(OH)2 and CSH gel within the specimen to dissolve, resulting in a rough, loose, and porous microstructure. This increases the material's porosity and significantly reduces its strength. On the other hand, the electric field also accelerates the release of external SO42-. 2- The migration of other ions, controlled by the potential difference, leads to the formation of a large number of corrosion products, although the formed corrosion products are affected by the Ca in the solution. 2+ SO4 2- and Al(OH) 4- Plasma also continues to migrate and partially decomposes under the influence of potential difference, but the overall erosion products increase, thus accelerating erosion; simultaneously, the Ca in the concrete... 2+ The continuous dissolution of Ca(OH)2 and CSH gels causes the dissolution of Ca(OH)2 and CSH gels, increasing the porosity, which in turn facilitates the migration of corrosive ions.

[0055] The principle of ion etching is as follows:

[0056] Calcium ettringite crystal form: Calcium ettringite sulfate, which has very low solubility in water, reacts with 4CaO·Al₂O₃·13H₂O and 3CaO·Al₂O₃·CaSO₄·12H₂O to produce the product 3CaO·Al₂O₃·3CaSO₄·32H₂O, i.e., calcite. The ionic reaction equation is:

[0057] AlO 2- +2OH - +2H₂O→[Al(OH)₆] 3-

[0058] 2[Al(OH)6] 3- +6Ca 2+ +24H2O→{Ca6[Al(OH)6]2·24H2O} 6+

[0059] {Ca6[Al(OH)6]2·24H2O} 6+ +3SO4 2- +2H2O→{Ca6[Al(OH)6]2·24H2O}(SO4)3·2H2O

[0060] MgSO4 Dissolution - Crystalline Form: Magnesium sulfate corrosion is one of the most damaging forms of concrete corrosion, mainly because MgSO4... 2+ and SO4 2- Both are erosion sources, and their reaction equations are as follows:

[0061] Mg2SO4+Ca(OH)2+2H2O→CaSO4·2H2O+Mg(OH)2

[0062] CS-H+Mg2SO4+5H2O→Mg(OH)2+CaSO4·2H2O+2H2SiO4

[0063] 4CaO·Al2O3·13H2O+3MgSO4+2Ca(OH)2→3CaO·Al2O3·3CaSO4·32H2O+3Mg(OH)2

[0064] A system for conducting concrete durability tests includes a central control system 1, a housing 2, and a power cord 4. The housing is equipped with a test wall 12, a sliding rail 11, a liquid storage tank 9, a condenser 8, a humidifier 10, a ventilation fan 7, an ultraviolet lamp 13, and temperature and humidity sensors 21. The central control system includes a display screen 5 and a control panel 6. The temperature and humidity conditions within the housing are fed back to the display screen 5 via the temperature and humidity sensors. The display screen also shows parameters of other control factors. The control panel 6 allows adjustment of environmental conditions within the housing, such as temperature, humidity, ultraviolet intensity, and types of corrosive ions, as well as the movement of the test wall 12 and the vibration of the test chamber 3.

[0065] After the system is powered on, the central control system controls the power-on status of the test chamber 3, the vibration frequency of the test chamber in the test wall 12, the feeding status of the feeding nozzle 15, and the working status of the storage tank 9, heating blanket 19, condenser 8, humidifier 10, ventilation fan 7, and ultraviolet lamp 13. The heating blanket can be used to study the effect of temperature on concrete durability. Powering on the test chamber 3 can accelerate the corrosion of concrete specimens by corrosive ions; the storage tank 9 stores corrosive solutions such as sodium sulfate, magnesium sulfate, and sodium chloride, which are corrosive to concrete. The central control system 1 controls the corresponding solutions to be injected into the solution holding area of ​​the test chamber 2 through the infusion pipe 26, realizing the automation of liquid injection. At the end of the test, the solution is collected into the storage tank 9 by the vacuum water pump 14, realizing the automation of solution replacement and collection. By injecting different types of solutions, the corrosion resistance of different types of concrete can be studied. The test wall in this invention is a segmented hollow cuboid. The temperature, ultraviolet intensity, electric field intensity, carbon dioxide concentration, etc. of the test environment are collected by the sensor 21 and displayed on the display screen 5.

[0066] Each compartment includes a feeding nozzle 15, front and rear rotating partitions 16, a mold base plate 17, temperature and humidity sensors, ultraviolet intensity sensors, carbon dioxide concentration sensors, and electric field strength sensors 21, as well as a slide rail 20 connected to the bottom of the base plate. The feeding nozzle 15 is located at the top center of the test compartment and the feeding of the mixture is controlled by a central control system 1. The mold base plate 17 is a plate-shaped structure, connected to the slide rail, and arranged opposite to each other to achieve the vibration effect on the test block. The rotating partitions 16 are located on the front and rear sides of the mold base plate 17 and are connected by hinges, forming a cavity with the mold base plate for preparing concrete durability test specimens.

[0067] An AC frequency converter 22 is installed on the outer surface of the test chamber. After the chamber is powered on, the central control system 1 can control the AC frequency converter 22 to enter and exit its working state. Figure 2As shown, after filling the cavity with the mixture, vibrating and curing it, and then lowering the front and rear rotating partitions 16, multiple specimens of corresponding sizes can be obtained for concrete performance testing. After lowering the front and rear rotating partitions 16, the central control system 1 controls the carbon dioxide jetting device 25 to spray carbon dioxide to a specified concentration, thereby achieving carbon dioxide curing of the concrete. Furthermore, it can be used for research on the durability of concrete carbonation.

[0068] After the molded specimens are cured to the expected strength, the central control system controls the injection of the etching solution from the storage tank 9 into both sides of the test wall 12, controls the temperature, humidity, and ultraviolet intensity of the system, and controls the operation of the AC frequency converter power supply 22 to conduct the durability test of the electric field accelerated ion etching of concrete. After the etching test, the central control system controls the vacuum water pump 14 to extract the etching solution from both sides of the test wall 12, and controls the test wall 12 to move along the sliding rail 11 closer to the external metal box to facilitate the removal of the test specimens.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated multi-environment simulated concrete durability accelerated testing system, characterized in that: It includes a housing, a central control system for adjusting and controlling the physical parameters inside the housing, and a test chamber installed inside the housing for conducting concrete durability tests. The test chamber is equipped with a solution holding area, which is located on both sides of the test wall. The corrosive solution stored in the storage tank is injected into the solution holding area through the infusion pipe installed on the test chamber. The test chamber includes a test wall with several compartments. Each compartment has a wall, and a slide rail is located below the wall, allowing the wall to slide. A test mold base plate is located at the bottom of the wall. Two opposing rotating partitions are rotatably mounted above the test mold base plate. The rotation of the rotating partitions is controlled by a central control system. Grooves are located on both sides of the wall. When the rotating partitions rotate to be parallel to the test mold base plate, they smoothly connect with the grooves, providing the necessary curing environment for the test blocks. After curing, the etching solution on both sides of the test chamber comes into contact with the test blocks for testing, facilitating the removal of the test blocks at the end of the test. When the rotating partitions rotate to be perpendicular to the test mold base plate, they form a sealed space with the wall, providing conditions for test block molding. The test wall is a cuboid with segmented cavities. The cuboid contains various sizes, and the rotating partitions between each row and column are hollow, with built-in wires that connect to temperature and humidity sensors, ultraviolet intensity sensors, electric field intensity sensors, heating blankets, and slide rails, forming a complete circuit. The heating blanket is located inside the cavity of the wall below the compartment; an embedded feeding nozzle is provided in the center of the top wall of the compartment inside the test wall to inject the mixture into each test mold, and the pipe is set inside the cavity of the wall; The mold base plate is connected to the slide rail, and the two work together to vibrate the test block; the rotating partition plate works with the mold base plate to form a cavity for preparing concrete durability test blocks.

2. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: The central control system includes a display screen, a control panel, and an internal integrated circuit; it also includes a condenser, a humidifier, a ventilation fan, an ultraviolet lamp, a heating blanket, a carbon dioxide jet device, and a liquid storage tank, all housed within the enclosure.

3. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: The physical parameters controlled by the central control system include carbon dioxide concentration, temperature, humidity, ultraviolet intensity, addition / replacement / removal of solution in the test chamber, opening and closing of the internal electric field accelerated erosion device, type of electric field, voltage magnitude and frequency, and selection of raw materials for the test block.

4. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 2, characterized in that: The storage tank contains a corrosive solution, including one or more of sodium sulfate, magnesium sulfate, magnesium chloride, calcium sulfate, sodium chloride, sulfuric acid, hydrochloric acid, nitric acid, and sodium hydroxide.

5. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 2, characterized in that: The box is equipped with a vacuum pump, which is connected to the infusion pipeline to collect the solution.

6. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: An AC frequency converter power supply is installed on the outer surface of the test chamber. The AC frequency converter power supply is controlled by the central control system to control the electric field to conduct accelerated ion erosion experiments.

7. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: The wall above each compartment is equipped with a material feeding nozzle for autonomous pouring into different compartments. The material feeding nozzle is connected to a concrete feeding pump, which enables automated delivery of mixtures of different materials to each compartment, while also allowing for testing of different types of materials.

8. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: The wall is used to vibrate the test blocks during preparation by moving them on a slide rail; at the end of the test, it is moved to the edge of the box via the slide rail to retrieve and place the test blocks.

9. The integrated multi-environment simulation concrete durability accelerated testing system according to claim 1, characterized in that: The groove is filled with an adsorbent material to prevent the solutions in different compartments from permeating each other.

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