A corrosion simulation test device for reinforced concrete composite materials

Abstract

This invention provides a corrosion simulation test device for reinforced concrete composite materials, comprising two steel piles and a test chamber mounted on top of the two steel piles. The two steel piles are fixed to the ground by anchor bolts, extending upwards through the test chamber. Arc-shaped guide sliding recesses are formed along the length of each steel pile at its top. Hemispherical guide blocks are slidably fitted into each guide sliding recess. Rectangular grooves for placing reinforced concrete samples are formed above the hemispherical guide blocks, with both ends of the reinforced concrete samples placed in the rectangular grooves of the two hemispherical guide blocks respectively. A sample delivery door for loading and unloading reinforced concrete samples is formed on the side wall of the test chamber. The test device also includes an air supply mechanism and a spray mechanism for simulating a marine environment, and a load mechanism for simulating load. This invention has a compact structure and reasonable design, and can flexibly simulate most operating conditions for reinforced concrete corrosion simulation tests, making it highly practical.

Description

Technical Field

[0001] This invention relates to the field of reinforced concrete performance testing technology, and in particular to a corrosion simulation test device for reinforced concrete composite materials. Background Technology

[0002] Reinforced concrete composite materials generally refer to a composite material made by adding steel mesh or steel plates to concrete. The higher tensile strength or ductility of the steel bars compensates for the relatively lower tensile strength and ductility of the concrete, thereby improving its mechanical properties. Reinforced concrete composite materials form the basic structural framework of modern buildings and are one of the most common engineering materials. They are widely used not only as foundations in above-ground buildings but also in water-related structures, especially marine infrastructure.

[0003] The principle of concrete is based on the hydraulic properties of hydrogels, which allow cement and aggregates to fully react and fuse. During the concrete forming process, numerous structural defects exist, including gel voids, fine cracks, and pores. Over time, external corrosive media (including corrosive liquids and gases) can gradually penetrate and diffuse through these defects to the surface of the reinforcing steel within the concrete, further causing corrosion. Once the steel is corroded, a loose layer of iron oxide forms on its surface, and the steel expands significantly, creating splitting tensile stress around the reinforced concrete. When this tensile stress exceeds the tensile strength of the concrete, cracks appear. These cracks further exacerbate the corrosion of the steel, creating a vicious cycle until the reinforced concrete composite material fails. The corrosion process is as follows: Figure 6 As shown. Once reinforced concrete composite materials fail, they will lose their supporting capacity for facilities or buildings, leading to disasters or shortened building lifespans, resulting in huge economic losses. The corrosion of reinforced concrete composite materials is particularly severe in coastal or marine facilities and buildings, such as coastal water conservancy and flood control facilities and coastal defense structures. This is because chloride ions in coastal air and seawater are a significant factor in the corrosion of reinforced concrete, damaging the passivation film on the surface of the steel bars, forming corrosion cells, and causing chloride depolarization hazards that accelerate corrosion. If rapid deterioration and collapse of reinforced concrete composite materials occurs, it will not only cause huge economic losses and casualties, but may even endanger national coastal defense security.

[0004] Therefore, in order to extend the service life of reinforced concrete composite materials and reduce steel corrosion, the development of corrosion-resistant or coated steel bars has become a common bottleneck issue facing steel production enterprises. To test the corrosion resistance of reinforced concrete composite materials, developing a corrosion testing device that can fully simulate a marine environment is currently a primary problem that needs to be solved.

[0005] Existing publicly available test methods and apparatus include salt spray chamber corrosion tests for small steel samples and circulating beaker immersion test apparatuses. The shortcomings of these existing test apparatuses and techniques include:

[0006] 1. The influence of load-bearing factors on reinforced concrete composite materials in actual use was not considered. Corrosion cracks are parallel to the reinforcing bars, while load cracks are transverse cracks; as corrosion progresses, longitudinal cracks widen and intersect with transverse structural cracks, ultimately leading to concrete breakage.

[0007] 2. The impact of carbon dioxide on concrete carbonation in reality was not considered. When concrete comes into contact with carbon dioxide in the atmosphere, hydrates can react with carbon dioxide to form carbonates, reducing the original alkalinity of the concrete, a phenomenon known as "carbonation." Carbonation damages the protective function of concrete, leading to corrosion of the reinforcing steel.

[0008] Therefore, researching a corrosion simulation test device that can fully simulate various environments can greatly improve the research difficulties in corrosion resistance of reinforced concrete composite materials. Summary of the Invention

[0009] To address the aforementioned problems in the existing technology, the present invention aims to provide a corrosion simulation test device for reinforced concrete composite materials to meet the testing requirements for the corrosion resistance of existing reinforced concrete.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] A corrosion simulation test device for reinforced concrete composite materials includes two steel piles and a test chamber mounted on top of the two steel piles. The two steel piles are fixed to the ground by anchor bolts and extend upwards through the test chamber. A circular arc-shaped guide sliding recess is formed at the top of each steel pile along its length. A hemispherical guide block is slidably fitted within each guide sliding recess. A rectangular groove for placing a reinforced concrete sample is formed above each hemispherical guide block, with both ends of the sample placed in the rectangular grooves of the two hemispherical guide blocks. A sample delivery door for loading and unloading the reinforced concrete sample is formed on the side wall of the test chamber. The test device also includes an air supply mechanism and a spray mechanism for simulating a marine environment, and a load mechanism for simulating load.

[0012] A further improvement of the present invention is that: the spraying mechanism includes a spraying platform installed in the mounting slot at the top of the test chamber, and the front end face of the spraying platform is provided with a plurality of gas spray holes and a plurality of liquid spray holes, the gas spray holes and liquid spray holes are arranged alternately in the horizontal direction, and adjacent and close gas spray holes and liquid spray holes form a spraying unit; the gas spray holes are connected to a compressed air pipeline and the liquid spray holes are connected to a water source pipeline.

[0013] A further improvement of the present invention is that the blowing direction of the gas nozzle and the blowing direction of the liquid nozzle within the same spray unit form an acute angle that facilitates gas-liquid collision.

[0014] A further improvement of the present invention is that: pressure gauges and secondary pressurization pumps are installed on the compressed air pipe and water source pipe located outside the spray station, and a filter is also installed on the water source pipe.

[0015] A further improvement of the present invention is that: the gas delivery mechanism includes an inlet pipe and an exhaust pipe symmetrically arranged on opposite side walls of the test chamber, the height of the inlet pipe and the exhaust pipe being higher than the height of the sample delivery door; the inlet pipe is connected to a gas source pipeline, and the exhaust pipe is connected to a venting tower.

[0016] A further improvement of the present invention is that a parallel and independently controllable conveying pipe and an absorption pipe are provided between the exhaust pipe and the venting tower, and an alkaline component for absorbing acidic gases such as sulfur dioxide is installed in the absorption pipe.

[0017] A further improvement of the present invention is that the load mechanism includes an inverted triangular apex cone pressed against the surface of the reinforced concrete sample, an apex cone rod connected to the inverted triangular apex cone, the apex cone rod passing through the top plate of the test chamber and connected to a load plate that can accommodate multiple load blocks, the load plate being horizontally positioned.

[0018] A further improvement of the present invention is that the load mechanism further includes a support frame disposed outside the test chamber, and a guide sleeve is provided on the top plate of the support frame corresponding to the position of the top cone rod, and the top cone rod and the guide sleeve are slidably engaged.

[0019] A further improvement of the present invention is that: a vertical corrosion thickness scale is provided on the top edge of the support frame, and a pointer for reading the corrosion thickness scale is provided on the top cone rod located between the test chamber and the support frame.

[0020] A further improvement of the present invention is that: a vertical water level gauge is also provided inside the test chamber, and the bottom center of the test chamber is connected to the waste liquid tank through a waste liquid discharge pipe, and an openable and closable waste liquid valve is provided on the waste liquid discharge pipe.

[0021] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0022] This invention provides a corrosion simulation testing device for reinforced concrete composite materials. It can simulate different service environments and conduct corrosion simulation tests based on the specific applications of reinforced concrete composite materials. This allows for intuitive and objective detection of the corrosion status, service life, and strength of reinforced concrete, obtaining comprehensive and realistic corrosion data. This provides effective data support for steel companies to develop corrosion-resistant reinforcing bars. The invention features a compact structure, reasonable design, and flexibility, and can meet the corrosion simulation testing needs of most operating conditions.

[0023] This invention fully considers various environmental factors during the use of reinforced concrete, such as salt corrosion in coastal environments, carbon dioxide carbonization in terrestrial environments, sulfuric acid corrosion in special environments such as factories, and load-bearing pressure loss of reinforced concrete as a load-bearing foundation. It is equipped with multiple simulation mechanisms inside the test chamber, such as a load-bearing mechanism, an air supply mechanism, and a spray mechanism. During specific tests, different simulation mechanisms can be activated according to the specific purpose of the reinforced concrete test to comprehensively simulate the actual environmental conditions under that purpose, thus possessing wide applicability.

[0024] The water supply pipe of the spray mechanism and the air supply pipe of the air delivery mechanism of this invention can be connected to different storage tanks or air tanks to provide different simulation scenarios. For example, if testing the corrosion resistance of reinforced concrete samples in a marine / coastal environment, the water supply pipe of the spray mechanism can be connected to a salt water pipe to fill the test chamber with salt water to submerge the reinforced concrete samples, or salt mist can be continuously sprayed into the test chamber; if testing the corrosion resistance of reinforced concrete samples in a terrestrial environment, the water supply pipe of the spray mechanism can be connected to a circulating water pipe to spray water mist to maintain the humidity in the test chamber to simulate the average humidity of the place of use. Similarly, when testing the corrosion resistance of reinforced concrete samples in marine / coastal environments, the gas supply pipe of the gas delivery mechanism can be connected to an air pipe, and waves can be generated by blowing in air to simulate the impact of ocean tides; when testing the corrosion resistance of reinforced concrete samples in terrestrial environments, the gas supply pipe of the gas delivery mechanism can be connected to a carbon dioxide cylinder, and carbon dioxide can be blown in to simulate carbonization; when testing the corrosion resistance of reinforced concrete samples in highly polluted environments such as factories, the gas supply pipe of the gas delivery mechanism can be connected to a sulfur dioxide delivery pipe or other corrosive gas delivery pipe to simulate the actual corrosion resistance of reinforced concrete under highly corrosive conditions.

[0025] This invention provides environmentally friendly collection and treatment of experimental exhaust gas and waste liquid, avoiding the discharge of pollutants, and is clean and environmentally friendly, meeting the environmental protection requirements of clean production and green production. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a top view of the structure of the present invention;

[0028] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 4 A schematic diagram of the gas supply mechanism's emission system;

[0030] Figure 5 This is a schematic diagram of the connection structure of the spray system;

[0031] Figure 6 This is a schematic diagram of the corrosion process of reinforced concrete.

[0032] In the diagram, 1. Steel pile; 2. Test chamber; 3. Hemispherical guide block; 4. Reinforced concrete sample; 6-1. Spraying platform; 6-2. Gas nozzle; 6-3. Liquid nozzle; 6-4. Gas chamber; 6-5. Liquid chamber; 6-6. Compressed air pipeline; 6-7. Water supply pipeline; 6-8. Transfer pump; 6-9. Flow regulating valve; 6-10. Control valve; 6-11. Secondary pressurization pump; 6-12. Pressure gauge; 6-13. Filter. 7-1. Inlet pipe; 7-2. Exhaust pipe; 7-3. Conveying pipe; 7-4. Absorption pipe; 7-5. Venting tower; 8-1. Inverted triangular top cone; 8-2. Top cone rod; 8-3. Loading plate; 8-4. Support frame; 8-5. Guide sleeve; 8-6. Corrosion thickness gauge; 8-7. Pointer; 8-8. Loading block; 9. Water level gauge; 10. Waste liquid discharge pipe; 11. Waste liquid tank; 12. Waste liquid valve; 13. Anchor bolts. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] A corrosion simulation test device for reinforced concrete composite materials, such as Figures 1-3 As shown, the system includes steel piles 1, a test chamber 2, a load-bearing mechanism, an air supply mechanism, and a spray mechanism. Two steel piles 1 are anchored to the ground using anchor bolts 13. The top of each steel pile 1 passes through the test chamber 2 and is sealed to the side wall of the test chamber 2. An arc-shaped guide sliding recess is formed along the length of each steel pile 1 at its top, and a hemispherical guide block 3 is slidably fitted within each guide sliding recess. The bottom of each hemispherical guide block 3 is hemispherical to match the guide sliding recess. A rectangular groove for placing a reinforced concrete sample 4 is formed above each hemispherical guide block 3. The two ends of the reinforced concrete sample 4 are placed in the rectangular grooves of the two hemispherical guide blocks 3, respectively, achieving stable horizontal support. A sample delivery door (not shown in the figure) for loading and unloading the reinforced concrete sample 4 is provided on the side wall of the test chamber 2.

[0035] The reinforced concrete specimen 4 is also equipped with an air supply mechanism and a spray mechanism to simulate various environments such as ocean or land.

[0036] like Figure 5 As shown, the spray mechanism is positioned above the test chamber 2 and is used to introduce water or water mist into the test chamber 2 to simulate seawater and seawater mist environments. The spray mechanism includes a spray platform 6-1 with gas nozzles 6-2 and liquid nozzles 6-3 at its front end. A mounting groove matching the shape of the spray platform 6-1 is provided on the upper part of the test chamber 2. The spray platform 6-1 is fixed in the mounting groove with nuts, so that its front end is inside the test chamber 2 and its rear end is outside the test chamber 2. There can be one or more spray platforms 6-1. In this embodiment, there are two spray platforms 6-1, arranged side-by-side on the same side wall of the test chamber 2. Multiple gas nozzles 6-2 and multiple liquid nozzles 6-3 are provided on the front surface of the spray platform 6-1. The gas nozzles 6-2 and liquid nozzles 6-3 are arranged alternately in the horizontal direction, with adjacent and close gas nozzles 6-2 and liquid nozzles 6-3 forming a spray unit. The gas nozzle 6-2 and liquid nozzle 6-3 within the same spray unit have acute angles, allowing the gas and liquid to fully collide and form a mist.

[0037] Preferably, the angle between the blowing direction of the gas nozzle 6-2 and the blowing direction of the liquid nozzle 6-3 in the same spray unit is 30°~50°, which can ensure that the sprayed gas and liquid fully collide to form fine mist droplets.

[0038] The gas nozzle 6-2 and liquid nozzle 6-3 are preferably tapered orifices that gradually narrow along the ejection direction, which can pressurize the ejected gas / liquid; the end diameters of the gas nozzle 6-2 and liquid nozzle 6-3 are adjusted according to the size of the test chamber so that they can spray out a uniform fine mist.

[0039] The number of gas nozzles 6-2 and liquid nozzles 6-3 can be adjusted according to the size of the experimental apparatus. In this embodiment, for example... Figure 1 , Figure 5 As shown, each spray station 6-1 is equipped with three gas nozzles 6-2 and three liquid nozzles 6-3, which are combined in pairs to form three spray units. If the space in the test chamber 2 is large, several sets of spray units can be set up vertically to quickly and evenly provide water mist or salt spray into the test chamber 2.

[0040] The spray station 6-1 is provided with multiple parallel gas chambers 6-4 and multiple parallel liquid chambers 6-5. The number of gas chambers 6-4 is the same as the number of gas nozzles 6-2, and the number of liquid chambers 6-5 is the same as the number of liquid nozzles 6-3. That is, in this embodiment, a total of three gas chambers 6-4 and three liquid chambers 6-5 are provided. The end of each gas chamber 6-4 is connected to a compressed air pipe 6-6, and its front end is connected to a gas nozzle 6-2, realizing continuous gas supply. The end of each liquid chamber 6-5 is connected to a water source pipe 6-7 (e.g., a circulating water pipe, a brine pipe, etc.), and its front end is connected to a liquid nozzle 6-3, realizing continuous water supply. The compressed air pipeline 6-6 and the water supply pipeline 6-7 are each equipped with a delivery pump 6-8, a flow regulating valve 6-9, and a control valve 6-10. The air and water circuits can be controlled independently. When water is added to the test chamber 2, only the water circuit is opened and the air circuit is closed, and the water is added until the appropriate height is reached. When a salt mist atmosphere is provided, the air and water circuits are opened simultaneously, and the flow rate is controlled by the flow regulating valve 6-9 so that the compressed air can fully atomize the salt water.

[0041] To further ensure the spraying effect, pressure gauges 6-12 and secondary booster pumps 6-11 are installed on the compressed air pipe 6-6 and water supply pipe 6-7 located outside the spray platform 6-1 to ensure stable air and water pressure and good atomization. In actual use, if the compressed air pipe 6-6 and water supply pipe 6-7 have branched outside the spray platform 6-1, pressure gauges 6-12 and secondary booster pumps 6-11 can also be installed on each branch pipe to ensure consistent spraying pressure in each spraying unit.

[0042] To ensure the continuous operation of the spray mechanism, a filter 6-13 is also installed on the water source pipe 6-7 to filter out large particles or impurities in the brine that are not completely dissolved, thus preventing them from clogging the liquid spray nozzle 6-3 and affecting the spraying effect.

[0043] like Figure 1 , Figure 4As shown, the gas supply mechanism is located above the sample delivery door and below the spray table 6-1. It is used to introduce air or corrosive gas into the sealed test chamber 2. When air is introduced, the airflow can cause moisture fluctuations, simulating ocean tides. When corrosive gas is introduced, it can simulate accelerated corrosion testing under acidic gas corrosive conditions to detect the corrosion resistance of the reinforced concrete sample 4. The gas supply mechanism includes an inlet pipe 7-1 and an exhaust pipe 7-2 symmetrically arranged on opposite side walls of the test chamber 2. The inlet pipe 7-1 is connected to a gas source pipeline (e.g., an air pipeline, a compressed air pipeline, a sulfur dioxide pipeline, a carbon dioxide pipeline, etc.). The exhaust pipe 7-2 is connected to a venting tower 7-5 through a conveying pipeline 7-3. The venting tower 7-5 is a vertically installed tower, and the discharge height of the venting tower 7-5 is higher than the height of the exhaust pipe, so that the gas in the test chamber 2 can be discharged autonomously without power. An absorption pipe 7-4 is also provided between the exhaust pipe 7-2 and the venting tower 7-5. The absorption pipe 7-4 is arranged parallel to the conveying pipe 7-3 and is independently controlled. A neutralization component for absorbing acidic gases such as sulfur dioxide is installed in the absorption pipe 7-4. When air, compressed air, or carbon dioxide is introduced into the intake pipe 7-1, the conveying pipe 7-3 is opened and the absorption pipe 7-4 is closed. The gas is discharged from the venting tower 7-5 after passing through the exhaust pipe 7-2 and the conveying pipe 7-3. When acidic corrosive gases such as sulfur dioxide are introduced into the intake pipe 7-1, the conveying pipe 7-3 is closed and the absorption pipe 7-4 is opened. The gas enters the absorption pipe 7-4 through the exhaust pipe 7-2, is neutralized, and is then discharged from the venting tower 7-5.

[0044] The test chamber 2 is also equipped with a vertical water level gauge 9 for detecting the water level inside the chamber; the upper edge of the water level gauge 9 is not lower than the top height of the reinforced concrete sample 4. The bottom center of the test chamber 2 is connected to the waste liquid tank 11 through a waste liquid discharge pipe 10, and an openable waste liquid valve 12 is installed on the waste liquid discharge pipe 10. The bottom center of the test chamber 2 is designed as a gradually narrowing funnel shape to facilitate waste liquid discharge. During the test, the waste liquid valve 12 is closed, and the water / corrosive liquid volume is determined by the water level gauge 9, and the changes in the water / corrosive liquid level are read during the test; after the test, the waste liquid valve 12 is opened first, and the water / corrosive liquid in the test chamber 2 is put into the waste liquid tank 11 before the sample is removed.

[0045] The corrosion simulation test device for reinforced concrete composite materials also includes a load mechanism for applying downward pressure to the reinforced concrete sample 4, thereby simulating the load-bearing and stress conditions of the reinforced concrete composite material. The load mechanism includes a load plate 8-3, a top cone rod 8-2, and an inverted triangular top cone 8-1. The bottom of the top cone rod 8-2 is connected to the inverted triangular top cone 8-1, and the top is connected to the load plate 8-3. The top cone rod 8-2 penetrates the top plate of the test chamber 2 and extends into the test chamber 2, allowing the inverted triangular top cone 8-1 to press firmly against the reinforced concrete sample 4. Multiple load blocks 8-8 can be placed on the load plate 8-3 according to test requirements, ensuring the downward pressure meets the inspection requirements of the reinforced concrete sample 4. A support frame 8-4 is also provided outside the test chamber 2, surrounding the test chamber 2 and fixedly connected to the steel pile 1. The top plate of the support frame 8-4 is located below the load plate 8-3. A guide sleeve 8-5 is provided on the top plate of the support frame 8-4 corresponding to the position of the top cone rod 8-2, and the top cone rod 8-2 moves up and down in the guide sleeve 8-5. A vertical corrosion thickness scale 8-6 is provided on the top edge of the support frame 8-4, and a pointer 8-7 pointing to the corrosion thickness scale 8-6 is provided on the top cone rod 8-2 located between the test chamber 2 and the support frame 8-4. During the test, the data of the corrosion thickness scale 8-6 can be read through the pointer 8-7 to record the influence and change of the load on the thickness direction of the reinforced concrete specimen 4. When the reinforced concrete specimen 4 is deformed under load, the middle of the reinforced concrete specimen 4 sinks, and the hemispherical guide block 3 used to support the reinforced concrete specimen 4 rotates at a certain angle in the guide sliding groove to maintain continued stable support for the reinforced concrete specimen 4 and avoid stress fracture; at this time, the deformation of the reinforced concrete specimen 4 can be read through the corrosion thickness scale 8-6.

[0046] The length of the inverted triangular apex cone 8-1 is not less than the width of the reinforced concrete specimen 4, so that the bottom of the inverted triangular apex cone 8-1 is evenly pressed onto the reinforced concrete specimen 4.

[0047] The top cone rod 8-2 has several pin holes along its height direction, which can be used to fix the top cone rod 8-2 to the guide sleeve 8-5. When the test is over, first remove the load block 8-8, then lift the top cone rod 8-2 so that the inverted triangular top cone 8-1 leaves the sample surface. Insert a pin into a suitable pin hole above the guide sleeve 8-5 and hang the inverted triangular top cone 8-1 on the guide sleeve 8-5, so that the test personnel can take out the reinforced concrete sample 4 for further testing.

[0048] The support frame 8-4 has a sample delivery channel at the position corresponding to the sample delivery door, which facilitates the smooth sampling and delivery. The tip of the inverted triangular cone 8-1 is rounded.

[0049] Since the interior of test chamber 2 must be a sealed environment to realistically simulate the marine environment and improve the accuracy of testing, all connections between test chamber 2 and each component must be sealed. For example, sealing components such as sealing strips and sealing rings are installed at the edges of the sample delivery door, the connections between the air inlet pipe 7-1 and the exhaust pipe 7-2 and test chamber 2, the connection between the spray platform 6-1 and test chamber 2, and the connection between the top cone rod 8-2 and test chamber 2. This ensures that the environment of test chamber 2 is isolated from the outside world during the test, preventing water and air leakage, thereby ensuring the accuracy of the test. The sealing components are preferably made of silicone, which has good corrosion resistance and can maintain a good sealing effect even in simulated environments such as salt spray.

[0050] The steel pile 1, support frame 8-4, inverted triangular apex cone 8-1, and apex cone rod 8-2 are all made of stainless steel, providing good support and resistance to corrosion from special environments. The test chamber 2 is an acrylic test chamber, which has good load-bearing capacity, support capacity, and corrosion resistance. At the same time, the transparent acrylic chamber allows testers to easily observe the changes in the state inside the test chamber 2.

[0051] The experimental apparatus of this invention can simulate various environments for accelerated corrosion tests. Under load, it can perform various accelerated corrosion tests, including salt spray corrosion damage, carbonation damage, sulfur dioxide atmospheric corrosion damage, and intermittent seawater immersion damage. In practical applications, appropriate combinations are selected to simulate the environment based on the different uses of the reinforced concrete composite material.

[0052] 1. After the newly developed steel reinforcement passes the accelerated corrosion test, it is made into reinforced concrete samples for actual environmental simulation tests to further determine the corrosion resistance of steel reinforcement in reinforced concrete.

[0053] Under the requirements of the above-mentioned application methods, the test focuses on the collapse deformation of reinforced concrete composite materials under normal atmospheric conditions.

[0054] At this point, a method combining a 1.5%–3.6% mass concentration salt solution atomization corrosion method, a carbon dioxide gas carbonization concrete accelerated steel corrosion method, and a reinforced concrete composite material street-side load accelerated concrete crack generation method can be used. That is, a suitable load weight is added to the reinforced concrete sample, the gas supply mechanism continuously introduces carbon dioxide gas into the test chamber, and at the same time the spraying mechanism sprays out a 1.5%–3.6% mass concentration salt solution mist.

[0055] 2. In order to provide reference data for the planning and design of coastal industrialization construction, it is necessary to test the degree of rust or corrosion rate in reinforced concrete samples under coastal environmental simulation.

[0056] At this time, the following methods can be used: seawater tidal immersion corrosion test method + industrial atmospheric pollution sulfur dioxide corrosion test method + heavy load critical test method. That is, a suitable load weight is added to the reinforced concrete sample, a certain amount of salt water is added into the test chamber through the spraying mechanism so that the liquid level covers the reinforced concrete sample, and at the same time, the air supply mechanism continuously introduces sulfur dioxide into the test chamber to simulate an acid pollution environment.

[0057] When the gas supply mechanism continuously pumps sulfuric acid gas, the exhaust air from the test chamber is first adsorbed and neutralized by the alkaline components, and then discharged from the venting tower.

[0058] 3. If reinforced concrete is used for land-based industrial construction, load tests need to be conducted under suitable temperature and humidity conditions to determine the degree of corrosion in the reinforced concrete samples under simulated land environment conditions.

[0059] The carbon dioxide, oxygen, and water shower test method combined with the critical load test method can be used. That is, a suitable load weight is added to the reinforced concrete sample, water or water mist is sprayed into the test chamber through a spraying mechanism, and carbon dioxide and oxygen are continuously pumped in through an air supply mechanism.

[0060] Depending on the environment to be simulated, the experimental apparatus of this invention can be combined in various ways to achieve multiple experimental methods. The three methods described above are merely illustrative examples and are not limited to these three experimental methods.

[0061] The working process of this invention is as follows:

[0062] S1. Using a mold, the reinforced concrete composite material is hydrolyzed into a reinforced concrete sample of a fixed size;

[0063] S2. Open the sample delivery door, send the dry reinforced concrete sample into the test chamber, place it stably in the rectangular groove of the two hemispherical guide blocks, then close and lock the sealed sample delivery door, and close the waste liquid valve.

[0064] S3. Remove the pin above the guide sleeve, lower the top cone rod until the inverted triangular top cone presses against the middle of the reinforced concrete sample; place multiple load blocks into the load plate according to the test requirements;

[0065] S4. According to the specific test requirements, turn on the spray mechanism and / or air supply mechanism to provide a simulated environment for the sample corrosion test in the test chamber; actively observe the test changes and the changes in the corrosion thickness scale during the test.

[0066] S5. After the test, turn off the spray mechanism and / or the air supply mechanism, open the waste liquid valve to drain the waste liquid; remove the weight, lift the top cone rod and fix it with the pin so that the inverted triangular top cone leaves the sample surface; take out the reinforced concrete sample completely through the sample delivery door for further testing.

[0067] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A corrosion simulation test device for reinforced concrete composite materials, characterized in that: The test device includes two steel piles (1) and a test chamber (2) fixedly installed on the upper part of the two steel piles (1). The two steel piles (1) are fixed to the ground by anchor bolts (13) and the steel piles (1) extend upward through the test chamber (2). The top of the steel piles (1) is provided with an arc-shaped guide sliding groove along the length of the steel piles (1). A hemispherical guide block (3) is slidably fitted in each guide sliding groove. A rectangular groove for placing a reinforced concrete sample (4) is provided above the hemispherical guide block (3). The two ends of the reinforced concrete sample (4) are respectively placed in the rectangular grooves of the two hemispherical guide blocks (3). A sample delivery door for taking out and placing the reinforced concrete sample (4) is provided on the side wall of the test chamber (2). The test device also includes an air supply mechanism and a spray mechanism for simulating the marine environment, and a load mechanism for simulating the load.

2. The corrosion simulation test device for reinforced concrete composite materials according to claim 1, characterized in that: The spraying mechanism includes a spraying platform (6-1) installed in the mounting slot on the upper part of the test chamber (2). The front end face of the spraying platform (6-1) is provided with a plurality of gas spray holes (6-2) and a plurality of liquid spray holes (6-3). The gas spray holes (6-2) and liquid spray holes (6-3) are arranged alternately, and adjacent and close gas spray holes (6-2) and liquid spray holes (6-3) form a spraying unit. The gas spray holes (6-2) are connected to the compressed air pipeline (6-6), and the liquid spray holes (6-3) are connected to the water source pipeline (6-7).

3. The corrosion simulation test device for reinforced concrete composite materials according to claim 2, characterized in that: The direction of the gas nozzle (6-2) and the direction of the liquid nozzle (6-3) within the same spray unit are at an acute angle to facilitate gas-liquid collision.

4. The corrosion simulation test device for reinforced concrete composite materials according to claim 3, characterized in that: Pressure gauges (6-12) and secondary booster pumps (6-11) are installed on the compressed air pipe (6-6) and water source pipe (6-7) located outside the spray station (6-1). A filter (6-13) is also installed on the water source pipe (6-7).

5. The corrosion simulation test device for reinforced concrete composite materials according to claim 1, characterized in that: The gas delivery mechanism includes an inlet pipe (7-1) and an exhaust pipe (7-2) symmetrically arranged on opposite side walls of the test chamber (2). The height of the inlet pipe (7-1) and the exhaust pipe (7-2) is higher than the height of the sample delivery door. The inlet pipe (7-1) is connected to the gas source pipeline, and the exhaust pipe (7-2) is connected to the venting tower (7-5).

6. The corrosion simulation test device for reinforced concrete composite materials according to claim 5, characterized in that: The exhaust pipe (7-2) and the venting tower (7-5) are connected in parallel and independently controllable to a conveying pipe (7-3) and an absorption pipe (7-4). The absorption pipe (7-4) is equipped with an alkaline component for absorbing acidic gases such as sulfur dioxide.

7. The corrosion simulation test device for reinforced concrete composite materials according to claim 1, characterized in that: The load mechanism includes an inverted triangular top cone (8-1) pressed against the surface of the reinforced concrete sample (4) and a top cone rod (8-2) connected to the inverted triangular top cone (8-1). The top cone rod (8-2) passes through the top plate of the test chamber (2) and is connected to a load plate (8-3) that can accommodate multiple load blocks (8-8). The load plate (8-3) is set horizontally.

8. The corrosion simulation test device for reinforced concrete composite materials according to claim 7, characterized in that: The load mechanism also includes a support frame (8-4) set outside the test chamber (2). The top plate of the support frame (8-4) is provided with a guide sleeve (8-5) at the position corresponding to the top cone rod (8-2). The top cone rod (8-2) and the guide sleeve (8-5) are in sliding fit.

9. The corrosion simulation test device for reinforced concrete composite materials according to claim 8, characterized in that: A vertical corrosion thickness scale (8-6) is provided on the top edge of the support frame (8-4), and a pointer (8-7) for reading the corrosion thickness scale (8-6) is provided on the top cone rod (8-2) located between the test chamber (2) and the support frame (8-4).

10. The corrosion simulation test device for reinforced concrete composite materials according to claim 1, characterized in that: The test chamber (2) is also equipped with a vertical water level gauge (9). The bottom center of the test chamber (2) is connected to the waste liquid tank (11) through the waste liquid discharge pipe (10). A waste liquid valve (12) that can be opened and closed is provided on the waste liquid discharge pipe (10).

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