Concrete testing apparatus and method based on load-corrosion coupling effect

Abstract

The present invention relates to the technical field of experiment apparatuses for concrete wastewater pipe corrosion. Disclosed are a concrete testing apparatus and method based on a load-corrosion coupling effect. The apparatus simulates a real environment for a wastewater pipe on the basis of a load-corrosion coupling effect, and also applies a mechanical load and a chemical corrosion effect to a concrete test block, and accelerates the corrosion of the concrete test block by means of exposing the concrete test block, thereby implementing research on mechanical characteristics of a concrete material under the load-corrosion coupling effect, and providing a sample basis for evaluation in regard to research on aging characteristics of the concrete wastewater pipe. Further disclosed in the present invention is a concrete testing method based on the testing apparatus.

Description

Concrete testing device and method based on load-corrosion coupling Technical Field

[0001] The invention relates to the technical field of concrete sewage pipe corrosion test devices, in particular to a concrete test device and method based on load-corrosion coupling. Background Art

[0002] Urban construction is inseparable from the construction of sewage pipes. As the core structure of urban construction, sewage pipes are a decisive factor in whether a city can meet flood control standards. Currently, sewage pipes in urban environmental projects are mostly buried reinforced concrete structures. Due to their buried structure, once problems arise in sewage pipes, they are difficult to detect and repair, and the cost of repair is very high. Moreover, sewage pipe construction is often the top priority of urban flood control projects. Its construction involves a wide range of areas and a large investment. Passive response to sewage pipe problems is not conducive to urban development and construction. To proactively prevent possible structural problems in sewage pipes, it is necessary to study the aging characteristics of sewage pipes. Studying the aging characteristics of sewage pipes is inevitably linked to the durability of the concrete used to construct sewage pipes.

[0003] During operation, sewage pipes are subjected to loads such as soil pressure from above and around them, traffic loads, water pressure, and the inherent weight of the pipe and sewage. Simultaneously, the internal forces of the pipes, influenced by the temperature field and the interaction between the pipe and the soil, produce various mechanical forces, including tension, compression, bending, and shear. Furthermore, during operation, sewage pipes generate corrosive gases such as hydrogen sulfide. The combined effects of these loads and corrosion accelerate the aging process of sewage pipes, significantly impacting the durability of the concrete.

[0004] At present, most of the research on sewage pipe concrete materials focuses on the corrosion laws of concrete under corroded conditions and the mechanical properties after corrosion. However, the aging of sewage pipe concrete is often caused by an environment where load and corrosion often occur together. Only the mechanical properties of concrete after corrosion are studied, so the aging characteristics of sewage pipe concrete lack a more reliable evaluation model and evaluation basis, making it difficult to prevent and solve the structural damage problem of sewage pipes in advance.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a concrete testing device and method based on load-corrosion coupling, which can apply load-corrosion coupling effects to concrete materials, simulate the actual environment of sewage pipes, obtain concrete materials close to the actual sewage pipe environment, and provide test objects for studying the aging characteristics of concrete pipes.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A concrete testing device based on load-corrosion coupling, in particular, comprises a reactor box, wherein a reaction chamber and a load chamber which are hermetically isolated from each other are provided in the reactor box;

[0009] The reaction chamber is provided with a reaction component capable of generating corrosive gas, which diffuses and fills the interior space of the reaction chamber; the reaction chamber is provided with a plurality of load molds, which are used to carry concrete test blocks and expose the concrete test blocks to the corrosive gas;

[0010] The load chamber is provided with a plurality of power components capable of applying mechanical loads. The output ends of the power components extend into the reaction chamber and are connected to corresponding load molds for applying force toward the corroded surface of the concrete test block.

[0011] Concrete test blocks can be prepared using different formulations based on the materials used in sewage pipes. The concrete test blocks placed in the load mold are exposed within the reaction chamber, allowing the corrosive gases generated by the reaction components to fully contact and react with all surfaces of the concrete test blocks. Based on the design of the load mold, the power component applies mechanical loads such as tension, compression, bending, and shear to the corroded surface of the concrete test blocks, causing the surface of the concrete test blocks to produce a coupled effect based on load-corrosion interactions, resulting in concrete test block samples that resemble the actual sewage pipe environment. By monitoring and analyzing the mechanical properties and corrosion conditions of the concrete test block samples, the experimenters established a model for evaluating and predicting the accelerated aging effects of sewage pipe concrete, enabling the prediction of the sewage pipe aging process.

[0012] In one embodiment, the reaction chamber is provided with a heat source for generating a simulated temperature field for the concrete test block, providing a set temperature environment for the concrete test block placed in the load mold, such as a temperature environment close to that of an actual sewage pipe. The heat source is airtightly isolated from the interior of the reaction chamber and does not come into contact with corrosive gases to prevent leakage of corrosive gases. Specifically, the heat source includes a temperature control device disposed outside the reactor housing, the temperature control device being connected to a heat pipe extending into the interior of the reaction chamber; a water heating component is provided within the temperature control device, and the water vapor generated by the water heating component is introduced into the heat pipe. Through heat exchange between the water vapor and the gas inside the reaction chamber, the temperature in the reaction chamber is smoothly regulated to avoid drastic temperature changes inside the reaction chamber.

[0013] In one embodiment, the reaction assembly includes a reaction tank containing a reaction solution and a blower located above the reaction tank. The reaction tank is connected to a liquid conduit extending outside the reactor housing and connected to a reservoir storing the reaction solution. The reaction solution in the reservoir is supplied to the liquid conduit via a feeding device, flows through the liquid conduit into the reaction tank, and reacts with the reaction solution in the reaction tank to generate corrosive gases such as hydrogen sulfide. The feeding device controls the feed rate and amount of the reaction solution in the reservoir to regulate and control the concentration of the corrosive gas within the reaction chamber.

[0014] In one embodiment, the load mold includes an upper mold and a lower mold, wherein,

[0015] The upper mold is connected to the output end of the power assembly and moves synchronously with the output end of the power assembly;

[0016] The lower mold is fixed in the reaction chamber; a supporting surface for supporting the concrete test block and a clamping surface for clamping and fixing the concrete test block are provided in the lower mold; the supporting surface is kept in contact with the concrete test block; the clamping surface can move relative to the concrete test block and is in contact with the surface of the concrete test block when the power component applies a mechanical load.

[0017] Before applying the mechanical load to the concrete specimen, all surfaces of the specimen, except those in contact with the supporting surface, can be exposed within the reaction chamber, allowing them to fully contact the corrosive gas to achieve the desired corrosion conditions for the test. Depending on the test requirements, the clamping surface can also be aligned with the surface of the concrete specimen before the dynamic component applies the mechanical load, controlling the surface of the concrete specimen exposed within the reaction chamber. This, in turn, controls the area and duration of contact between the corrosive gas and the concrete specimen to achieve the desired corrosion conditions for the test.

[0018] In one embodiment, the power assembly includes a screw driven for rotation by a power source, and a transmission block that reciprocates along the screw's axis. The transmission block is provided with a synchronous sleeve that rotates synchronously with the transmission block, and the transmission block drives the synchronous sleeve to rotate and move up and down. The synchronous sleeve contains multiple rolling elements. A load block is provided outside the synchronous sleeve for applying a load to the concrete test block, and the load block moves up and down with the synchronous sleeve. The rolling elements are rollingly connected to the load block. The screw and transmission block combination, controlled by a power source such as a servo motor, can precisely control the load applied to the concrete test block surface. This facilitates adjustment of the load applied to the concrete test block surface throughout the load-corrosion coupling test, simulating the ever-changing external force environment of a real sewage pipeline. This makes the concrete test block samples obtained from this test apparatus more realistic in the actual sewage pipeline environment, and more suitable for research on the aging characteristics of the concrete samples.

[0019] In one embodiment, the test apparatus is also equipped with a monitoring module that monitors the temperature, humidity, and corrosive gas concentration inside and outside the reactor chamber. Based on this data, the reaction and power components can automatically control their operating states, adjusting for factors such as corrosion reaction and mechanical load, ensuring more accurate and effective testing.

[0020] Compared with the prior art, the concrete testing device of the present invention has the following beneficial effects:

[0021] (1) This test device applies load-corrosion coupling to concrete specimens, simulating the real environment of sewage pipes. It enables the study of mechanical tests on concrete materials under the dual effects of load and corrosion, and provides a sample basis for the evaluation of concrete aging characteristics.

[0022] (2) This test device fully exposes the concrete test block to the corrosive gas, allowing the test block to fully contact the corrosive gas, accelerating the corrosion process of the test block and effectively shortening the test time;

[0023] (3) This test device applies mechanical loads and chemical corrosion effects to the test block samples at the same time. The coupling effect of the two is used to avoid the singleness of the concrete pipe aging simulation, making the test simulation more accurate and effective, and providing a reliable sample basis for the study of concrete aging characteristics.

[0024] Based on the aforementioned test device, the present invention further provides a concrete testing method based on load-corrosion coupling, which specifically includes the following steps:

[0025] (A) Place the concrete test block in the load mold of the reaction chamber so that all surfaces of the concrete test block except the surface in contact with the load mold are exposed in the reaction chamber;

[0026] (B) sealing the reaction chamber, starting the reaction assembly, preparing the corrosive gas, and allowing the corrosive gas to diffuse and fill the interior space of the reaction chamber;

[0027] (C) After the concentration of the corrosive gas reaches a set value and the corrosion time reaches a set value, the reaction component is closed, the power component is started, and a mechanical load is applied to the concrete specimen to cause the concrete specimen to be subjected to a load-corrosion coupling effect;

[0028] (D) After the load time reaches the set value, turn off the power component; remove the corrosive gas and remove the concrete test block.

[0029] After the reaction assembly is closed, the reaction chamber is filled with a corrosive gas of sufficient concentration. The power assembly is then started, which can subject the concrete specimen in the reaction chamber to the load-corrosion coupling effect, thereby obtaining a sample specimen based on the load-corrosion coupling effect.

[0030] When the dynamic assembly is activated, the load mold will conform to the other surfaces of the concrete specimen, while supporting the concrete specimen, based on the type of mechanical load applied. The force applied by the load mold to the other surfaces of the concrete specimen will also affect the surface of the concrete specimen and be one of the results of the test observation.

[0031] In steps B, C, and D, the reaction component and the power component can be connected to the control module. Based on the data feedback from the monitoring component in the reaction chamber, the control module outputs a control signal to control the working status of the reaction component and the power component, thereby realizing automated control of the test process.

[0032] The disclosed concrete testing method, based on load-corrosion coupling, uses concrete specimens inside drainage pipes as the research object. Corrosive gases are introduced to simulate the internal corrosion environment of the pipes. Basic loads such as tension, compression, bending, and shear are then applied to the concrete specimens to simulate the actual stress conditions of the pipes. After the test, the specimens are removed from the apparatus and flushed, photographed, and scanned to obtain data such as corrosion depth and crack development. Basic mechanical testing is then performed on the specimens to study their mechanical properties. This allows the development of a predictive model for assessing accelerated aging effects, providing a reliable sample basis for studying the aging characteristics of concrete pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of an experimental device in Example 1 of the present invention;

[0034] FIG2 is a schematic diagram of a first load mold in Example 1 of the present invention;

[0035] FIG3 is a schematic diagram of a second load mold in Example 1 of the present invention;

[0036] FIG4 is a schematic diagram of a third load mold in Example 1 of the present invention;

[0037] FIG5 is a schematic diagram of a fourth load mold in Example 1 of the present invention;

[0038] FIG6 is a schematic diagram of a power assembly in Example 2 of the present invention.

[0039] In the figure, 1. reactor box; 2. reaction chamber; 3. load chamber; 4. support plate; 5. reservoir; 6. peristaltic pump; 7. heat pipe; 8. reaction tank; 9. fan; 10. liquid guide tube; 11. tension upper mold; 11a. fitting part; 11b. clamping part; 12. tension lower mold; 13. pressure upper mold; 14. pressure lower mold; 15. bending force upper mold; 16. bending force lower mold; 17. shear force upper mold; 17a. movable part; 17b. pressing and shearing part; 18. shear force lower mold; 19. power assembly; 19a. servo motor; 19b. screw; 19c. transmission block; 19d. synchronous sleeve; 19e. accommodating chamber; 19f. spring; 19g. connecting plate; 19h. ball; 19i. load block; 19j. annular groove; 20. internal monitoring module; 21. external monitoring module. DETAILED DESCRIPTION

[0040] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0041] In the description of the present invention, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, it may be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In describing the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0044] Example 1

[0045] As shown in the figure, the concrete testing apparatus according to a preferred embodiment of the present invention uses square concrete test blocks as test objects. It includes a reactor housing 1, which is placed entirely within a fume hood to recover and process corrosive gases generated during the test. Reactor housing 1 houses a reaction chamber 2 and a load chamber 3, with a support plate 4 positioned between them. This support plate 4 separates the reaction chamber 2 and the load chamber 3, ensuring an airtight isolation between them. The sidewalls of reactor housing 1 are made of transparent material, allowing the experimenter to observe the interiors of the reaction chamber 2 and the load chamber 3.

[0046] Outside the reactor housing 1, a reservoir 5 for storing the sodium sulfide solution (reaction solution) and a peristaltic pump 6 in communication with the reservoir 5 are installed. The peristaltic pump 6, acting as a feed device for the sodium sulfide solution, supplies it to the reaction chamber 2 according to the experimental conditions to generate hydrogen sulfide gas. To ensure experimental safety, the reservoir 5 and peristaltic pump 6 are preferably placed together in a fume hood.

[0047] The peristaltic pump 6 is integrated with a temperature control device, which includes a water heating assembly. This water heating assembly is connected to a heat pipe 7 that extends into the interior of the reaction chamber 2. The water vapor generated by the water heating assembly is introduced into the heat pipe 7. The heat pipe 7 must be airtight and isolated from the interior of the reaction chamber 2 to prevent leakage of hydrogen sulfide gas within the reaction chamber 2.

[0048] The reaction chamber 2 is provided with a reaction pool 8, a blower 9, a liquid guide tube 10, and a plurality of load molds, wherein:

[0049] The reaction tank 8 is filled with hydrochloric acid (reaction solution) for reacting with the sodium sulfide solution to generate hydrogen sulfide gas;

[0050] The fan 9 is arranged above the reaction tank 8, and the direction of the air flow ejected by the fan 9 is toward the position of the lower mold;

[0051] The liquid conduit 10 is located above the reaction tank 8 and extends to the outside of the reactor box 1, and is connected to the peristaltic pump 6; the sodium sulfide solution fed by the peristaltic pump 6 is transported to the reaction tank 8 through the liquid conduit 10 to react with hydrochloric acid; the liquid conduit 10 is sealed to the reactor box 1.

[0052] Based on the type of mechanical load to be applied, the load mold can have a variety of designs. The experimenter can select a load mold with a corresponding design based on the style and shape of the concrete test block. Multiple load molds are preferably arranged in parallel so that the hydrogen sulfide gas can contact the concrete test block in each load mold after diffusion. In this embodiment 1, the load mold adopts the following structural design:

[0053] (1) First load mold: The first load mold is used to apply a tensile load, and includes a tensile upper mold 11 and a tensile lower mold 12. The tensile upper mold 11 is fixed to the output end of the power assembly and moves with the movement of the output end. The tensile lower mold 12 is fixed in the reaction chamber 2 to support the concrete test block. The tensile upper mold 11 and the tensile lower mold 12 are both provided with a fitting portion 11a parallel to the top / bottom of the concrete test block, and a clamping portion 11b that can move back and forth toward / away from the fitting portion 11a, wherein the fitting portion 11a is respectively fitted to the top / bottom of the concrete test block based on its own position, and the corresponding clamping portion 11b is clamped on the side of the concrete test block.

[0054] (2) Second load mold: The second load mold is used to apply a pressure load and includes a pressure upper mold 13 and a pressure lower mold 14. The pressure upper mold 13 is a plate-shaped structure fixed to the output end of the power assembly and covers the top of the concrete test block as the output end moves. The tension lower mold 12 is fixed in the reaction chamber 2 and supports the concrete test block. The tension lower mold 12 is provided with a positioning edge arranged around the circumference of the concrete test block to fix the position of the concrete test block.

[0055] (3) Third load mold: The third load mold is used to apply bending force load, and includes an upper bending force mold 15 and a lower bending force mold 16. The upper bending force mold 15 is a plate-shaped structure with a cross-sectional area smaller than the top area of ​​the concrete test block. The upper bending force mold 15 is fixed to the output end of the power component and is pressed against the top of the concrete test block as the output end moves. The lower bending force mold 16 includes two symmetrically arranged support blocks, which are respectively arranged at the edges of the concrete test block to support the concrete test block so that the middle of the concrete test block is suspended in the air.

[0056] (4) The fourth load mold: The fourth load mold is used to apply shear load, and includes a shear upper mold 17 and a shear lower mold 18. The shear upper mold 17 includes a movable part 17a connected to the output end of the power component, and the movable part 17a is connected to a compression shearing part 17b that can move back and forth relative to the concrete test block. The compression shearing part 17b moves synchronously with the output end of the power component, is pressed against the surface of the concrete test block, and applies an extrusion force along the height direction to the concrete test block. The shear lower mold 18 carries the concrete test block and allows part of the concrete test block to be suspended and exposed, entering the area sheared by the compression shearing part 17b. When the compression shearing part 17b is pressed against the exposed area of ​​the concrete test block, the compression shearing part 17b and the shear lower mold 18 cause the concrete test block to generate a shear force along its own height direction.

[0057] Within the load chamber 3, power assemblies 19 are installed, corresponding to the number of loaded molds. Each power assembly 19 can be a conventional power output component, such as an air cylinder or oil cylinder. The output end of the power assembly 19, such as the piston rod of an air cylinder or oil cylinder, extends into the reaction chamber 2 through the support plate 4 and connects to the upper mold of the corresponding loaded mold.

[0058] The experimental device is also equipped with a monitoring module. This monitoring module includes an internal monitoring module 20 and an external monitoring module 21. The internal monitoring module 20 is placed inside the reactor housing 1 and is located inside the reaction chamber 2 and the load chamber 3, respectively. It monitors the temperature, humidity, and corrosive gas concentration in the reaction chamber 2, as well as the corrosive gas concentration in the load chamber 3. The external monitoring module 21 is placed outside the reactor housing 1 and monitors the corrosive gas concentration outside the reactor housing 1.

[0059] Both the internal monitoring module 20 and the external monitoring module 21 are connected to the control module outside the reactor housing 1. Based on the monitoring data fed back by the internal monitoring module 20 and the external monitoring module 21, the control module controls the operating status of components such as the peristaltic pump 6, the fan 9, the power assembly 19, and the water area heating assembly, so that the environment in the reaction chamber 2 and the state of the concrete specimen meet the requirements of the experimental design.

[0060] Based on the aforementioned test device, taking the application of a tensile load as an example, the test method using the test device of this embodiment 1 is as follows:

[0061] (A) Open the reaction chamber 2 and place the concrete specimen into the lower tensile mold. During this process, except for the contact portion 11a of the lower tensile mold, the clamping portion 11b of the lower tensile mold and the upper tensile mold are all away from the concrete specimen, so that all five sides of the concrete specimen are exposed in the reaction chamber 2.

[0062] (B) The reactor is sealed, and the control module is activated. The control module outputs a control signal to turn on the peristaltic pump 6 and the water area heating assembly. The peristaltic pump 6 delivers the sodium sulfide solution through the liquid conduit 10 to the reaction tank 8, where the sodium sulfide solution reacts with the hydrochloric acid to generate hydrogen sulfide gas. The water vapor generated by the water area heating assembly enters the heat pipe 7, where it changes the temperature in the reaction chamber 2 through heat conduction, thereby establishing the temperature field required for the experiment.

[0063] (C) The control module outputs a control signal to turn on the fan 9, blowing and diffusing the hydrogen sulfide gas generated by the reaction component to react with the concrete test block placed in the lower tension mold; the internal monitoring module 20 set in the reaction chamber 2 monitors and feedbacks the temperature, humidity and corrosive gas concentration in the reaction chamber 2 in real time; according to the data fed back by the internal monitoring module 20, the operating status of the peristaltic pump 6 and the water area heating component is controlled.

[0064] (D) When the hydrogen sulfide gas concentration reaches a set 40 ppm and the corrosion time reaches 30 days under the set temperature environment, the control module outputs a control signal to turn off the peristaltic pump 6.

[0065] (E) The control module outputs a control signal to start the power assembly 19, so that the output end of the power assembly 19 drives the upper tensile mold to press against the top of the concrete test block, and the clamping parts 11b of the upper tensile mold and the lower tensile mold are pressed against the surface of the concrete test block, so that the concrete test block is clamped and fixed by the upper tensile mold and the lower tensile mold;

[0066] (F) According to the tensile force value set in the test, the power assembly 19 is controlled to move, the concrete test block is stretched, and a mechanical test is performed on the concrete test block after hydrogen sulfide gas corrosion, so that the concrete test block is in a state of dual action of load and corrosion, and the tensile strength τ of the concrete test block under the dual action of load and corrosion is obtained. L1 ;

[0067] (G) Turn off the power assembly 19, purge the hydrogen sulfide gas in the reaction chamber 2, and remove the concrete test block.

[0068] The mechanical properties data and three-dimensional data of the concrete specimens subjected to the aforementioned loading coupling, the untested concrete specimens, and the concrete specimens that only experienced corrosion were summarized and compared. The data differences between the concrete specimens subjected to loading coupling and the untested concrete specimens, and the concrete specimens that only experienced corrosion and the untested concrete specimens, such as the mechanical data difference, the three-dimensional height difference, the corrosion surface depth difference, etc., were taken to obtain the accelerated effect of concrete specimen aging caused by the dual effect; and based on statistical methods, the specimen size, loading level, hydrogen sulfide concentration, corrosion time, etc. were used as input parameters to effectively establish an aging acceleration effect evaluation and prediction model, which provides a theoretical basis for estimating the aging degree of sewage pipes and preventing sewage pipe damage.

[0069] In summary, the embodiments of the present invention provide a concrete test and method based on load-corrosion coupling. By applying load-corrosion coupling to concrete test blocks, the actual environment of sewage pipes is simulated, and the mechanical test of concrete materials under the dual effects of load and corrosion is studied, providing an evaluation basis for the study of concrete aging characteristics.

[0070] Example 2

[0071] The concrete testing device of this embodiment 2 is different from that of embodiment 1 in that, in this embodiment 2, the power assembly 19 adopts the following design:

[0072] As shown in FIG6 , the power assembly 19 includes a screw 19b driven by a servo motor 19a as a power source and a transmission block 19c that reciprocates along the axial direction of the screw 19b. The transmission block 19c is provided with a synchronous sleeve 19d that rotates synchronously with the transmission block 19c.

[0073] The synchronous sleeve 19d has an accommodating chamber 19e within it, into which the screw 19b extends. A transmission block 19c is positioned within the accommodating chamber 19e and rises and falls synchronously with the chamber 19e. A spring 19f is positioned between the bottom of the transmission block 19c and the bottom of the accommodating chamber 19e to transmit and cushion any impact between the transmission block 19c and the synchronous sleeve 19d.

[0074] The synchronous sleeve 19d is provided with a columnar connecting plate 19g, and a plurality of balls 19h are provided at the end of the connecting plate 19g and are connected to the connecting plate 19g in a rolling manner. Each ball 19h serves as a rolling element and protrudes from the surface of the connecting plate 19g.

[0075] The synchronous sleeve 19d is fitted with a load block 19i, which applies a load to the concrete test block. An annular groove 19j is defined within the load block 19i, into which a connecting plate 19g is inserted. Balls 19h are rollingly connected within the groove 19j, allowing the load block 19i to move up and down with the synchronous sleeve 19d.

[0076] When power assembly 19 receives the start command, servo motor 19a rotates screw 19b, driving transmission block 19c to drive synchronous sleeve 19d downward along the axis of screw 19b until load block 19i is pressed against the surface of the concrete test block. Due to the rolling connection between synchronous sleeve 19d and load block 19i, load block 19i does not need to rotate with synchronous sleeve 19d during its descent. Based on the load conditions set in the test, servo motor 19a controls the rotation of screw 19b, causing transmission block 19c to continue to descend, squeezing spring 19f and driving spring 19f to apply a force to synchronous sleeve 19d toward the surface of the concrete test block. This force is then transmitted to the concrete test block through load block 19i, applying the set load value to the concrete test block.

[0077] The combined structure of the screw 19b and the transmission block 19c can accurately control the size of the load applied to the surface of the concrete specimen, making it convenient to adjust the load applied to the surface of the concrete specimen during the entire load-corrosion coupling test, simulating the ever-changing external force environment of a real sewage pipe, and making the concrete specimen samples obtained by this test device closer to the actual environment of the sewage pipe, and more consistent with the study of the aging characteristics of the concrete samples.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A concrete testing device based on load-corrosion coupling, characterized in that: It comprises a reactor box, wherein a reaction chamber and a load chamber which are hermetically isolated from each other are arranged in the reactor box; The reaction chamber is provided with a reaction component capable of generating corrosive gas, and the reaction component diffuses the corrosive gas to fill the inner space of the reaction chamber; the reaction chamber is provided with a plurality of load molds, and the load molds are used to carry concrete test blocks and expose the concrete test blocks to the corrosive gas; The load chamber is provided with a plurality of power components capable of applying mechanical loads, and the output ends of the power components extend into the reaction chamber and are connected to corresponding load molds for applying forces toward the corroded surface of the concrete test block.

2. The concrete testing device according to claim 1, characterized in that: The reaction chamber is provided with a heat source for generating a simulated temperature field for the concrete test block, so as to provide a set temperature environment for the concrete test block placed in the load mold.

3. The concrete testing device according to claim 2, characterized in that: The heat source includes a temperature control device arranged outside the reactor box, and the temperature control device is connected to a heat pipe extending to the inside of the reaction chamber; a water area heating component is arranged in the temperature control device, and the water vapor generated by the water area heating component is introduced into the heat pipe.

4. The concrete testing device according to claim 1, characterized in that: The reaction assembly comprises a reaction pool containing a reaction solution and a fan located above the reaction pool; the reaction pool is connected to a liquid conduit extending outside the reactor box, and the liquid conduit is connected to a reservoir storing the reaction solution.

5. The concrete testing device according to claim 1, characterized in that: The load mold includes an upper mold and a lower mold, wherein: The upper mold is connected to the output end of the power assembly and moves synchronously with the output end of the power assembly; The lower mold is fixed in the reaction chamber; the lower mold is provided with a A supporting surface of the concrete test block and a clamping surface for clamping and fixing the concrete test block; the supporting surface is kept in contact with the concrete test block; the clamping surface can move relative to the concrete test block and is in contact with the surface of the concrete test block when the power component applies a mechanical load.

6. The concrete testing device according to claim 1, characterized in that: The power assembly includes a screw driven to rotate by a power source, and a transmission block reciprocating along the axial direction of the screw; a synchronous sleeve is provided on the outer shell of the transmission block, and the transmission block drives the synchronous sleeve to rotate and move up and down; a plurality of rolling rolling elements are provided in the synchronous sleeve; a load block for applying a load to a concrete test block is provided on the outer shell of the synchronous sleeve, and the load block moves up and down with the synchronous sleeve; the rolling element is rollingly connected to the load block.

7. The concrete testing device according to claim 1, characterized in that: It includes a monitoring module; the monitoring module monitors the temperature, humidity and corrosive gas concentration inside and outside the reactor box.

8. A concrete test method based on load-corrosion coupling, characterized in that: The concrete testing device as claimed in claims 1 to 7 is used, comprising the following steps: (A) Place the concrete test block into the load mold of the reaction chamber so that the surface of the concrete test block, except the surface in contact with the load mold, is exposed in the reaction chamber; (B) sealing the reaction chamber, starting the reaction assembly, preparing the corrosive gas, and allowing the corrosive gas to diffuse and fill the inner space of the reaction chamber; (C) After the concentration of the corrosive gas reaches a set value and the corrosion time reaches a set value, the reaction component is turned off, the power component is started, and a mechanical load is applied to the concrete test block, so that the concrete test block is subjected to a load-corrosion coupling effect; (D) After the load time reaches the set value, turn off the power component; remove the corrosive gas and take out the concrete test block.

9. The concrete testing method according to claim 8, characterized in that: In steps B, C, and D, the reaction component and the power component are connected to the control module. Based on the data fed back by the monitoring component in the reaction chamber, the control module outputs a control signal to control the working state of the reaction component and the power component.

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