A simulation test device and method for chloride ion diffusion resistance of concrete

Abstract

The present invention relates to the technical field of concrete durability testing, and discloses a simulation test device and method for concrete chloride ion diffusion resistance. Among them, a simulation test device for concrete chloride ion diffusion resistance includes a support platform, a height adjustment mechanism, a synchronous drive mechanism, a pressing platform, a test cavity construction mechanism, an auxiliary adjustment mechanism, a liquid guiding mechanism, and a data monitoring mechanism; the present invention can adjust the test chamber formed between the test cavity construction mechanism and the test piece through the auxiliary adjustment mechanism, and can stably adjust the pressure and solution concentration in the test chamber during the test. Compared with the method of continuously introducing a large amount of solution for pressure regulation, it can not only effectively reduce the loss of the chlorine-containing solution, but also effectively improve the stability of the liquid in the test chamber, effectively reduce the influence of the turbulence generated when re-introducing the chlorine-containing solution on the test, and improve the accuracy of the test parameters.

Description

Technical Field

[0001] The invention relates to the technical field of concrete durability testing, and more specifically, to a concrete chloride ion diffusion resistance simulation test device and method. Background Art

[0002] my country has a long coastline and widespread saline soil areas. A large amount of reinforced concrete is subjected to severe chloride-salt environmental erosion, which leads to corrosion of the steel bars inside the structure and reduced durability. Therefore, the penetration and diffusion of chloride ions is a top priority in research. However, due to the limitations of experimental conditions, the test conditions cannot meet the on-site working conditions well, and the research results have large errors, which is very unfavorable for the correct evaluation or assessment of the safety and life cycle of the project.

[0003] Currently, the commonly used test conditions mainly adopt natural penetration, which cannot fully simulate the physical field or stress field conditions at the engineering site and has a large error.

[0004] The existing simulated test equipment uses a sealed cover of fixed volume to tightly cover the surface of the concrete test block, and introduces a set amount of chlorine-containing solution to form a test environment with a set pressure. However, since the volume in the cavity is fixed, the concentration of the internal solution will also change under different pressure conditions, so it is necessary to configure the concentration of the chlorine-containing solution according to the pressure setting value. During the test, as the chloride ions penetrate, the solution concentration changes, which affects the pressure change. The chlorine-containing solution needs to be re-introduced for adjustment, which can easily cause the concentration of the chlorine-containing solution to change. The actual calculation and configuration of the introduced liquid concentration are also required, which not only consumes more chlorine-containing solution, but is also more cumbersome and costly. Summary of the invention

[0005] The purpose of the present invention is to provide a concrete chloride ion diffusion resistance simulation test device and method in order to solve the above problems.

[0006] The present invention provides a simulation test device for the chloride ion diffusion resistance of concrete, comprising a support platform, a height adjustment mechanism movably connected to the support platform, a synchronous drive mechanism arranged on the support platform, a pressing platform threadedly connected to the height adjustment mechanism, a test cavity construction mechanism fixedly connected to the middle position of the upper end of the pressing platform, an auxiliary adjustment mechanism arranged on the upper end of the test cavity construction mechanism, and a liquid guiding mechanism and a data monitoring mechanism arranged on the support platform. A through hole is provided at the middle position of the support platform, and the internal space of the test cavity construction mechanism is communicated with the through hole. The synchronous drive mechanism is connected to the height adjustment mechanism, and the height adjustment mechanism is used to adjust the distance between the pressing platform and the support platform. When the pressing platform contacts the test piece and applies a set pressure value thereto, a sealed test chamber is formed among the test cavity construction mechanism, the pressing platform and the test piece. The output end of the liquid guiding mechanism is communicated with the test chamber, and the data monitoring mechanism is used to obtain the hydraulic pressure in the test chamber and the chloride ion concentration of the chlorine-containing solution;

[0007] The test cavity construction mechanism includes a through-type cylinder fixedly connected to the middle position of the upper end of the pressing platform, a volume adjustment component arranged inside the through-type cylinder, and an exhaust component arranged on the volume adjustment component. The volume adjustment component is used to adjust the volume of the test chamber, and the inside of the test chamber is communicated with the external space through the exhaust component;

[0008] The auxiliary adjustment mechanism is used to adjust the distance between the volume adjustment component and the pressing platform and apply a set value of pressure to the volume adjustment component.

[0009] As a further optimized solution of the present invention, the height adjustment component includes a plurality of screws movably connected to the support platform. The plurality of screws are evenly distributed at the four corners of the support platform, and the plurality of screws are all threadedly connected to the pressing platform. A gasket is provided at the middle position of the upper end of the support platform.

[0010] As a further optimized solution of the present invention, the synchronous drive mechanism includes a first motor, a first sprocket connected to the output shaft end of the first motor, a second sprocket connected to one of the screws, a first chain connected between the first sprocket and the second sprocket, a third sprocket connected to the height adjustment mechanism, and a second chain connected between the plurality of third sprockets. The first motor is fixedly connected to the upper end of the support platform. A square cavity is provided inside the support platform. The output shaft end of the first motor penetrates through the upper end of the support platform and extends into the square cavity. The first sprocket, the first chain, the second sprocket, the third sprocket and the second chain are all located in the square cavity. The lower ends of the plurality of screws all penetrate through the upper end of the support platform and are movably connected to the inner bottom wall of the square cavity.

[0011] As a further optimized solution of the present invention, the pressing platform includes a pressing plate, a plurality of nuts fixedly connected to the pressing plate, and a sealing gasket connected to the middle position at the bottom end of the pressing plate. A plurality of through holes are provided on the pressing plate, and the plurality of through holes are arranged corresponding to the nuts. A plurality of screw rods respectively pass through the corresponding through holes and are threadedly connected to the matching nuts.

[0012] As a further optimized solution of the present invention, the volume adjustment assembly includes a limiting block fixedly connected to the inner wall of the through-type cylinder body and a first piston member provided in the through-type cylinder body. The outer diameter of the first piston member is the same as the inner diameter of the through-type cylinder body, and a piston ring is sleeved on the outer circular surface of the first piston member. The limiting block is provided at a position on the inner wall of the through-type cylinder body close to the pressing plate, and the first piston member is located above the limiting block.

[0013] As a further optimized solution of the present invention, the exhaust assembly includes air holes provided on the first piston member, a first pipe connected to the upper end of the first piston member, a liquid level gauge and a solenoid valve connected to the first pipe. The first pipe is communicated with the test chamber through the first piston member.

[0014] As a further optimized solution of the present invention, the auxiliary adjustment mechanism includes a plurality of telescopic rods fixedly connected to the upper end of the through-type cylinder body, a first bracket connected between the plurality of telescopic rods, a second motor fixedly installed on the first bracket, a second bracket fixedly connected to the upper end opening of the through-type cylinder body, a lead screw threadedly connected to the second bracket, a second piston member movably connected to the lower end of the lead screw, a spring fixedly connected to the lower end of the second piston member, and a plurality of limiting guide rods connected to the upper end of the second piston member. The plurality of limiting guide rods are all slidably connected to the second bracket. The output shaft end of the second motor is detachably connected to the upper end of the lead screw. The lower end of the spring is fixedly connected to the first piston member. The outer diameter of the second piston member is the same as the inner diameter of the through-type cylinder body, and a piston ring is sleeved on the outer circular surface of the second piston member. A plurality of first pipes are provided at a position on the through-type cylinder body close to the second bracket. The thickness of the second piston member is less than the distance between the first pipe and the second bracket.

[0015] As a further optimized solution of the present invention, the liquid guiding mechanism includes a joint connected to the upper end of the pressing plate, a liquid guiding channel provided inside the pressing plate, a first liquid guiding pipe connected to the inner wall of the through hole, a telescopic corrugated pipe connected to one end of the first liquid guiding pipe, a second liquid guiding pipe connected to one end of the telescopic corrugated pipe, and a plurality of liquid guiding holes provided on the second liquid guiding pipe. The lower end surface of the second liquid guiding pipe is flush with the lower end surface of the sealing gasket. The first liquid guiding pipe is communicated with the joint through the liquid guiding channel.

[0016] As a further optimized solution of the present invention, the data monitoring mechanism includes a hydraulic sensor and a chloride ion sensor connected to the inner wall of the perforation, and a connection terminal connected to the upper end of the pressing plate. Both the hydraulic sensor and the chloride ion sensor are electrically connected to the connection terminal.

[0017] A method for simulating concrete chloride ion diffusion test uses a concrete chloride ion diffusion simulation test device as described above, and includes the following steps:

[0018] Step 100: Place the concrete test piece between the pressing platform and the supporting platform.

[0019] Step 200: Drive the height adjustment mechanism to operate through the synchronous drive mechanism. When the height adjustment mechanism operates, it drives the pressing platform to move towards the supporting platform until the pressing platform contacts the upper end surface of the concrete test piece and generates a set value of pressure, and a sealed test chamber is formed above the concrete test piece.

[0020] Step 300: Open the exhaust assembly and pour a set amount of chlorine-containing solution into the test chamber through the liquid guiding mechanism.

[0021] Step 400: Drive the volume adjustment component to move towards the concrete test piece through the auxiliary adjustment mechanism until the gas in the test chamber is completely exhausted, and then close the exhaust assembly.

[0022] Step 500: Continuously drive the volume adjustment component to move towards the concrete test piece through the auxiliary adjustment mechanism until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value.

[0023] Step 600: Real-time monitor the hydraulic pressure and chloride ion concentration of the chlorine-containing solution in the test chamber through the data monitoring mechanism. When the hydraulic pressure decreases, drive the volume adjustment component to continue moving towards the concrete test piece through the auxiliary adjustment mechanism until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value. When the hydraulic pressure reaches the set value and the chloride ion concentration of the chlorine-containing solution is higher or lower than the set range, introduce a set amount and set concentration of chlorine-containing solution into the test chamber through the liquid guiding mechanism.

[0024] The beneficial effects of the present invention are as follows: The present invention can adjust the test chamber formed between the experimental cavity construction mechanism and the test piece through the auxiliary adjustment mechanism, and can stably adjust the pressure and solution concentration in the test chamber during the test. Compared with the method of continuously introducing a large amount of solution for pressure adjustment, it can not only effectively reduce the loss of chlorine-containing solution, but also effectively improve the stability of the liquid in the test chamber, effectively reduce the influence of the turbulence generated when introducing the chlorine-containing solution again on the test, and improve the accuracy of the test parameters. Description of the Drawings

[0025] Figure 1 is the overall structural schematic diagram of the present invention;

[0026] Figure 2 is the Figure 1 cross-sectional view at A-A in;

[0027] Figure 3 is the Figure 2 enlarged view at B in;

[0028] Figure 4 is the Figure 2 enlarged view at C in;

[0029] Figure 5 is the Figure 2 enlarged view at D in;

[0030] Figure 6 is the mating view of the synchronous drive mechanism and the height adjustment mechanism of the present invention.

[0031] In the figure: 1, support platform; 101, gasket; 102, square frame-shaped cavity; 2, synchronous drive mechanism; 201, first motor; 202, first sprocket; 203, first chain; 204, second sprocket; 205, third sprocket; 206, second chain; 3, height adjustment mechanism; 301, screw rod; 4, pressing platform; 401, pressing plate; 402, nut; 403, perforation; 404, sealing washer; 5, test cavity construction mechanism; 501, through-type cylinder; 502, limit block; 503, first piston member; 5030, air hole; 504, first pipeline; 505, liquid level gauge; 506, solenoid valve; 6, auxiliary adjustment mechanism; 601, telescopic rod; 602, first bracket; 603, second motor; 604, second bracket; 605, lead screw; 606, second piston member; 607, spring; 608, limit guide rod; 7, liquid guiding mechanism; 701, joint; 702, first liquid guiding pipe; 703, telescopic bellows; 704, second liquid guiding pipe; 7040, liquid guiding hole; 8, data monitoring mechanism; 801, hydraulic sensor; 802, chloride ion sensor; 803, connection terminal. Detailed implementation manners

[0032] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Additionally, features described relative to some examples can also be combined in other examples.

[0033] As Figure 1-2As shown in the figure, a simulation test device for the chloride ion diffusion resistance of concrete includes a support platform 1, a height adjustment mechanism 3 movably connected to the support platform 1, a synchronous drive mechanism 2 provided on the support platform 1, a pressing platform 4 threadedly connected to the height adjustment mechanism 3, a test cavity construction mechanism 5 fixedly connected to the middle position of the upper end of the pressing platform 4, an auxiliary adjustment mechanism 6 provided on the upper end of the test cavity construction mechanism 5, and a liquid guiding mechanism 7 and a data monitoring mechanism 8 provided on the support platform 1. A perforation 403 is provided at the middle position of the support platform 1, and the internal space of the test cavity construction mechanism 5 is communicated with the perforation 403. The synchronous drive mechanism 2 is connected to the height adjustment mechanism 3, and the height adjustment mechanism 3 is used to adjust the distance between the pressing platform 4 and the support platform 1. When the pressing platform 4 contacts the test piece and applies a set pressure value to it, a sealed test chamber is formed among the test cavity construction mechanism 5, the pressing platform 4 and the test piece. The output end of the liquid guiding mechanism 7 is communicated with the test chamber, and the data monitoring mechanism 8 is used to obtain the hydraulic pressure and the chloride ion concentration of the chlorine-containing solution in the test chamber;

[0034] The test cavity construction mechanism 5 includes a through-type cylinder body 501 fixedly connected to the middle position of the upper end of the pressing platform 4, a volume adjustment component provided inside the through-type cylinder body 501, and an exhaust component provided on the volume adjustment component. The volume adjustment component is used to adjust the volume of the test chamber, and the inside of the test chamber is communicated with the external space through the exhaust component;

[0035] The auxiliary adjustment mechanism 6 is used to adjust the distance between the volume adjustment component and the pressing platform 4 and apply a set value of pressure to the volume adjustment component.

[0036] It should be noted that the test process for the chloride ion diffusion resistance of the concrete test piece using the above simulation test device for the chloride ion diffusion resistance of concrete includes the following steps:

[0037] Place the concrete test piece between the pressing platform 4 and the support platform 1;

[0038] Drive the height adjustment mechanism 3 to operate through the synchronous drive mechanism 2. When the height adjustment mechanism 3 operates, it drives the pressing platform 4 to move towards the support platform 1 until the pressing platform 4 contacts the upper end surface of the concrete test piece and generates a set value of pressure, and a sealed test chamber is formed above the concrete test piece;

[0039] Open the exhaust component, and pour a set amount of chlorine-containing solution into the test chamber through the liquid guiding mechanism 7;

[0040] Drive the volume adjustment component to move towards the concrete test piece through the auxiliary adjustment mechanism 6 until the gas in the test chamber is completely exhausted, and then close the exhaust component;

[0041] The auxiliary adjustment mechanism 6 continuously drives the volume adjustment component to move towards the concrete test piece until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value;

[0042] The data monitoring mechanism 8 monitors the hydraulic pressure and chloride ion concentration of the chlorine-containing solution in the test chamber in real time. When the hydraulic pressure decreases, the auxiliary adjustment mechanism 6 drives the volume adjustment component to continue moving towards the concrete test piece until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value. When the hydraulic pressure reaches the set value and the chloride ion concentration of the chlorine-containing solution is higher or lower than the set range, a set amount and concentration of chlorine-containing solution are introduced into the test chamber through the liquid guiding mechanism 7.

[0043] Compared with the method of continuously introducing a large amount of solution for pressure adjustment, the loss of the chlorine-containing solution can be effectively reduced, the stability of the liquid in the test chamber can be effectively improved, the influence of the turbulence generated when the chlorine-containing solution is introduced again on the test can be effectively reduced, and the accuracy of the test parameters can be improved.

[0044] In an embodiment of the present invention, as Figure 1-2 and Figure 6 shown, the height adjustment component includes a plurality of screws 301 movably connected to the support platform 1. The plurality of screws 301 are evenly distributed at the four corners of the support platform 1. The plurality of screws 301 are all threadedly connected to the pressing platform 4. A gasket 101 is provided at the middle position of the upper end of the support platform 1.

[0045] It should be noted that when the synchronous driving mechanism 2 drives the height adjustment mechanism 3 to adjust the pressing platform 4 to move towards or away from the support platform 1, the synchronous driving mechanism 2 can drive the plurality of screws 301 to rotate in the same direction and at the same angle. In this embodiment, four screws 301 are taken as an example. Since the four screws 301 are all threadedly connected to the pressing platform 4, the pressing platform 4 is restricted by the four screws 301 and can only move along the length direction of the screws 301. The length direction of the screws 301 is perpendicular to the support platform 1, which can make the pressing platform 4 parallel to the support platform 1 when moving up and down, and the four corners of the pressing platform 4 receive the same force, so that a stable and tight contact can be formed between the pressing platform 4 and the concrete test piece, and a stable test chamber can be formed above the concrete test piece.

[0046] In an embodiment of the present invention, as Figure 1-2 and Figure 6As shown in the figure, the synchronous drive mechanism 2 includes a first motor 201, a first sprocket 202 connected to the output shaft end of the first motor 201, a second sprocket 204 connected to one of the screws 301, a first chain 203 connected between the first sprocket 202 and the second sprocket 204, a third sprocket 205 connected to the height adjustment mechanism 3, and a second chain 206 connected between several third sprockets 205. The first motor 201 is fixedly connected to the upper end of the support platform 1. An inner cavity 102 in the shape of a double square is provided inside the support platform 1. The output shaft end of the first motor 201 penetrates through the upper end of the support platform 1 and extends into the inner cavity 102 in the shape of a double square. The first sprocket 202, the first chain 203, the second sprocket 204, the third sprocket 205, and the second chain 206 are all located in the inner cavity 102 in the shape of a double square. The lower ends of several screws 301 penetrate through the upper end of the support platform 1 and are movably connected to the inner bottom wall of the inner cavity 102 in the shape of a double square;

[0047] The pressing platform 4 includes a pressing plate 401, several nuts 402 fixedly connected to the pressing plate 401, and a sealing gasket 404 connected to the middle position at the bottom end of the pressing plate 401. Several through holes are provided on the pressing plate 401. The several through holes are arranged corresponding to the nuts 402. Several screws 301 respectively pass through the corresponding through holes and are threadedly connected to the matching nuts 402.

[0048] It should be noted that as described above, when the four screws 301 are driven to rotate in the same direction and at the same angle by the synchronous drive mechanism 2, the first sprocket 202 is driven to rotate by the first motor 201. After the first sprocket 202 rotates, the second sprocket 204 is driven to rotate by the first chain 203. Since the second sprocket 204 is connected to one of the screws 301, when the second sprocket 204 rotates, one of the screws 301 can be driven to rotate. After one of the screws 301 rotates, the third sprocket 205 connected thereto is driven to rotate. After the third sprocket 205 rotates, the third sprockets 205 connected to the other three screws 301 can be driven to rotate in the same direction and at the same angle by the second chain 206, so that the four screws 301 can all rotate in the same direction and at the same angle. When the four screws 301 rotate simultaneously, the corresponding nuts 402 can be driven to move in the vertical direction. Since the nuts 402 are fixedly connected to the pressing plate 401, the pressing plate 401 can be driven to stably move downward following the nuts 402. Moreover, the force on the four corner regions of the pressing plate 401 is uniform, which can ensure that the sealing gasket 404 is in parallel contact with the upper end surface of the concrete test piece and presses on the concrete test piece with a set pressure, so that the sealing gasket 404 can deform and stably seal the gap between the pressing plate 401 and the concrete test piece.

[0049] In an embodiment of the present invention, as Figure 1-2As shown in the figure, the volume adjustment component includes a limiting block 502 fixedly connected to the inner wall of the through-type cylinder 501 and a first piston member 503 disposed in the through-type cylinder 501. The outer diameter of the first piston member 503 is the same as the inner diameter of the through-type cylinder 501, and a piston ring is sleeved on the outer circular surface of the first piston member 503. The limiting block 502 is disposed at a position on the inner wall of the through-type cylinder 501 close to the pressing plate 401, and the first piston member 503 is located above the limiting block 502.

[0050] It should be noted that, as described above, the first piston member 503 divides the internal space of the through-type cylinder 501 into upper and lower parts. The lower space is communicated with the through hole 403 to form a test chamber above the concrete test piece. When the position of the first piston member 503 in the through-type cylinder 501 changes, the volume of the test chamber can be adjusted. And when a set pressure value is applied to the upper end of the first piston member 503, it can be transmitted into the test chamber, so as to realize the hydraulic adjustment of the chlorine-containing solution in the test chamber, without the need to continuously introduce liquid for hydraulic adjustment, which can effectively reduce the usage amount of the chlorine-containing solution, reduce resource consumption and test costs.

[0051] In an embodiment of the present invention, as Figure 1-3 shown, the exhaust component includes an air hole 5030 disposed on the first piston member 503, a first pipe 504 connected to the upper end of the first piston member 503, a liquid level gauge 505 and a solenoid valve 506 connected to the first pipe 504. The first pipe 504 is communicated with the test chamber through the first piston member 503.

[0052] It should be noted that initially, the space above the first piston member 503 is communicated with the external space. When a set amount of chlorine-containing solution is introduced into the test chamber, the solenoid valve 506 can be opened, so that the gas in the test chamber can be discharged from the air hole 5030. When there is still air between the first piston member 503 and the liquid level, the first piston member 503 can be moved downward to squeeze the air out until the liquid level gauge 505 detects that the liquid enters the first pipe 504 and generates a liquid level of a set height, then the solenoid valve 506 is closed. At this time, only the chlorine-containing solution exists in the entire test chamber. At this time, a set value of pressure can be continuously applied to the first piston member 503, so that the hydraulic pressure of the chlorine-containing solution in the test chamber reaches the set value.

[0053] In an embodiment of the present invention, as Figure 1-2As shown in the figure, the auxiliary adjustment mechanism 6 includes several telescopic rods 601 fixedly connected to the upper end of the through-type cylinder body 501, a first bracket 602 connected between the several telescopic rods 601, a second motor 603 fixedly installed on the first bracket 602, a second bracket 604 fixedly connected to the upper end opening of the through-type cylinder body 501, a lead screw 605 threadedly connected to the second bracket 604, a second piston member 606 movably connected to the lower end of the lead screw 605, a spring 607 fixedly connected to the lower end of the second piston member 606, and several limit guide rods 608 connected to the upper end of the second piston member 606. The several limit guide rods 608 are all slidably connected to the second bracket 604. The output shaft end of the second motor 603 is detachably connected to the upper end of the lead screw 605. The lower end of the spring 607 is fixedly connected to the first piston member 503. The outer diameter of the second piston member 606 is the same as the inner diameter of the through-type cylinder body 501, and a piston ring is sleeved on the outer circumferential surface of the second piston member 606. Several first pipes 504 are provided at a position on the through-type cylinder body 501 close to the second bracket 604. The thickness of the second piston member 606 is less than the distance between the first pipe 504 and the second bracket 604.

[0054] It should be noted that as described above, when the first piston member 503 is driven to move downward by the auxiliary adjustment mechanism 6 and a set value of pressure is applied to it, specifically, the lead screw 605 is driven to rotate by the second motor 603. Since the lead screw 605 is threadedly connected to the fixed second bracket 604, the lead screw 605 can be driven to move towards the first piston member 503. When the lead screw 605 moves, it can drive the second piston member 606 to move in the same direction and the same distance until the solenoid valve 506 closes. At this time, a closed air storage space is formed between the second piston member 606 and the first piston member 503. Since the first piston member 503 contacts the liquid level of the chlorine-containing solution, at this time, the downward movement of the first piston member 503 is blocked. By continuously pushing the second piston member 606 downward through the lead screw 605, the second piston member 606 starts to compress the spring 607 and the air between the second piston member 606 and the first piston member 503. Through the combined action of the elastic force and air pressure on the first piston member 503, a continuously increasing pressure is provided for the first piston member 503. This pressure is applied from above the first piston member 503, so that the first piston member 503 transmits this pressure value to the chlorine-containing solution. After the chlorine-containing solution is pressurized, the same hydraulic pressure is generated to act on the first piston member 503 until the pressure value received by the upper end of the first piston member 503 reaches the set value, and the hydraulic pressure of the chlorine-containing solution in the test chamber can reach the set value.

[0055] In an embodiment of the present invention, as Figure 1-2 and Figure 4As shown in the figure, the liquid guiding mechanism 7 includes a connector 701 connected to the upper end of the pressing plate 401, a liquid guiding channel provided inside the pressing plate 401, a first liquid guiding pipe 702 connected to the inner wall of the perforation 403, a telescopic corrugated pipe 703 connected to one end of the first liquid guiding pipe 702, a second liquid guiding pipe 704 connected to one end of the telescopic corrugated pipe 703, and a plurality of liquid guiding holes 7040 provided on the second liquid guiding pipe 704. The lower end surface of the second liquid guiding pipe 704 is flush with the lower end surface of the sealing gasket 404. The first liquid guiding pipe 702 is connected to the connector 701 through the liquid guiding channel.

[0056] It should be noted that the connector 701 is externally connected to a hydraulic pump, and a chlorine-containing solution can be introduced into the test chamber through the hydraulic pump. The entire liquid guiding mechanism 7 can move along with the pressing plate 401. Among them, when the pressing plate 401 contacts the concrete test piece and deforms, the second liquid guiding pipe 704 and the sealing gasket 404 contact the concrete test piece at the same time. When the sealing gasket 404 deforms, the second liquid guiding pipe 704 is forced to move upward and squeezes the telescopic corrugated pipe 703, so that the second liquid guiding pipe 704 can always contact the upper end surface of the concrete test piece. Thus, at the end of the test, all the chlorine-containing solution can be withdrawn. When withdrawing the solution, the second piston member 606 can be driven to move upward so that the space between the second piston member 606 and the first piston member 503 is communicated with the first pipeline 504, and the solenoid valve 506 is opened to reduce the influence of the negative pressure during the solution withdrawal.

[0057] In an embodiment of the present invention, as Figure 1-2 and Figure 5 shown in the figure, the data monitoring mechanism 8 includes a hydraulic sensor 801 and a chloride ion sensor 802 connected to the inner wall of the perforation 403, and a connection terminal 803 connected to the upper end of the pressing plate 401. The hydraulic sensor 801 and the chloride ion sensor 802 are both electrically connected to the connection terminal 803.

[0058] It should be noted that the hydraulic sensor 801 and the chloride ion sensor 802 are respectively used to obtain the hydraulic data and chloride ion concentration data in the test chamber. The hydraulic sensor 801 and the chloride ion sensor 802 are both prior arts, and their specific models and parameters will not be elaborated here.

[0059] The above describes this embodiment, but this embodiment is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A simulation test device for chloride ion diffusion resistance of concrete, characterized in that, It includes a support platform (1), a height adjustment mechanism (3) movably connected to the support platform (1), a synchronous drive mechanism (2) provided on the support platform (1), a pressing platform (4) threadedly connected to the height adjustment mechanism (3), a test cavity construction mechanism (5) fixedly connected to the middle position at the upper end of the pressing platform (4), an auxiliary adjustment mechanism (6) provided at the upper end of the test cavity construction mechanism (5), and a liquid guiding mechanism (7) and a data monitoring mechanism (8) provided on the support platform (1). A perforation (403) is provided at the middle position of the support platform (1). The internal space of the test cavity construction mechanism (5) is communicated with the perforation (403). The synchronous drive mechanism (2) is connected to the height adjustment mechanism (3). The height adjustment mechanism (3) is used to adjust the distance between the pressing platform (4) and the support platform (1). When the pressing platform (4) contacts the test piece and applies a set pressure value to it, a sealed test chamber is formed among the test cavity construction mechanism (5), the pressing platform (4), and the test piece. The output end of the liquid guiding mechanism (7) is communicated with the test chamber. The data monitoring mechanism (8) is used to obtain the hydraulic pressure and the chloride ion concentration of the chlorine-containing solution in the test chamber; The test cavity construction mechanism (5) includes a through-type cylinder body (501) fixedly connected to the middle position at the upper end of the pressing platform (4), a volume adjustment component provided inside the through-type cylinder body (501), and an exhaust component provided on the volume adjustment component. The volume adjustment component is used to adjust the volume of the test chamber. The inside of the test chamber is communicated with the external space through the exhaust component; The auxiliary adjustment mechanism (6) is used to adjust the distance between the volume adjustment component and the pressing platform (4) and apply a set value of pressure to the volume adjustment component; The volume adjustment component includes a limiting block (502) fixedly connected to the inner wall of the through-type cylinder body (501) and a first piston member (503) provided inside the through-type cylinder body (501). The outer diameter of the first piston member (503) is the same as the inner diameter of the through-type cylinder body (501), and a piston ring is sleeved on the outer circumferential surface of the first piston member (503).

2. The concrete chloride ion diffusion simulation test equipment according to claim 1, characterized in that, The height adjustment mechanism (3) includes a plurality of screws (301) movably connected to the support platform (1). The plurality of screws (301) are evenly distributed at the four corners of the support platform (1). The plurality of screws (301) are all threadedly connected to the pressing platform (4). A gasket (101) is provided at the middle position of the upper end of the support platform (1).

3. The concrete chloride ion diffusion simulation test equipment according to claim 2, characterized in that, The synchronous drive mechanism (2) includes a first motor (201), a first sprocket (202) connected to the output shaft end of the first motor (201), a second sprocket (204) connected to one of the screws (301), a first chain (203) connected between the first sprocket (202) and the second sprocket (204), a third sprocket (205) connected to the height adjustment mechanism (3), and a second chain (206) connected between several third sprockets (205). The first motor (201) is fixedly connected to the upper end of the support platform (1). A rectangular cavity (102) is provided inside the support platform (1). The output shaft end of the first motor (201) penetrates through the upper end of the support platform (1) and extends into the rectangular cavity (102). The first sprocket (202), the first chain (203), the second sprocket (204), the third sprocket (205), and the second chain (206) are all located inside the rectangular cavity (102). The lower ends of several screws (301) all penetrate through the upper end of the support platform (1) and are movably connected to the inner bottom wall of the rectangular cavity (102).

4. The concrete chloride ion diffusion simulation test equipment according to claim 3, characterized in that, The pressing platform (4) includes a pressing plate (401), several nuts (402) fixedly connected to the pressing plate (401), and a sealing washer (404) connected to the middle position at the bottom end of the pressing plate (401). Several through holes are provided on the pressing plate (401), and the several through holes are arranged corresponding to the nuts (402). Several screws (301) respectively pass through the corresponding through holes and are threadedly connected to the matching nuts (402).

5. A concrete chloride ion diffusion simulation test device according to claim 4, characterized in that, The limiting block (502) is arranged at a position on the inner wall of the through-type cylinder (501) close to the pressing plate (401), and the first piston member (503) is located above the limiting block (502).

6. The concrete chloride ion diffusion simulation test equipment according to claim 5, characterized in that, The exhaust assembly includes a gas hole (5030) provided on the first piston member (503), a first pipe (504) connected to the upper end of the first piston member (503), a liquid level gauge (505) and a solenoid valve (506) connected to the first pipe (504). The first pipe (504) is communicated with the test chamber through the first piston member (503).

7. A concrete chloride ion diffusion simulation test device according to claim 6, characterized in that, The auxiliary adjustment mechanism (6) includes a plurality of telescopic rods (601) fixedly connected to the upper end of the through-type cylinder body (501), a first bracket (602) connected between the plurality of telescopic rods (601), a second motor (603) fixedly installed on the first bracket (602), a second bracket (604) fixedly connected to the upper end opening of the through-type cylinder body (501), a lead screw (605) threadedly connected to the second bracket (604), a second piston member (606) movably connected to the lower end of the lead screw (605), a spring (607) fixedly connected to the lower end of the second piston member (606), and a plurality of limit guide rods (608) connected to the upper end of the second piston member (606). The plurality of limit guide rods (608) are all slidably connected to the second bracket (604). The output shaft end of the second motor (603) is detachably connected to the upper end of the lead screw (605). The lower end of the spring (607) is fixedly connected to the first piston member (503). The outer diameter of the second piston member (606) is the same as the inner diameter of the through-type cylinder body (501), and a piston ring is sleeved on the outer circumferential surface of the second piston member (606). A plurality of first pipes (504) are provided at a position on the through-type cylinder body (501) close to the second bracket (604). The thickness of the second piston member (606) is less than the distance between the first pipe (504) and the second bracket (604).

8. A concrete chloride ion diffusion simulation test device according to claim 7, characterized in that, The liquid guiding mechanism (7) includes a connector (701) connected to the upper end of the pressing plate (401), a liquid guiding channel provided inside the pressing plate (401), a first liquid guiding pipe (702) connected to the inner wall of the perforation (403), a telescopic bellows (703) connected to one end of the first liquid guiding pipe (702), a second liquid guiding pipe (704) connected to one end of the telescopic bellows (703), and a plurality of liquid guiding holes (7040) provided on the second liquid guiding pipe (704). The lower end surface of the second liquid guiding pipe (704) is flush with the lower end surface of the sealing gasket (404). The first liquid guiding pipe (702) is communicated with the connector (701) through the liquid guiding channel.

9. A chloride ion diffusion simulation test device for concrete according to claim 8, wherein, The data monitoring mechanism (8) includes a hydraulic sensor (801) and a chloride ion sensor (802) connected to the inner wall of the perforation (403), and a connection terminal (803) connected to the upper end of the pressing plate (401). The hydraulic sensor (801) and the chloride ion sensor (802) are both electrically connected to the connection terminal (803).

10. A method for simulating the chloride ion diffusion resistance test of concrete, characterized in that, Using a concrete chloride ion diffusion simulation test device according to any one of claims 1-9, comprising the following steps: Step 100: Place the concrete test piece between the pressing platform (4) and the supporting platform (1). Step 200: Drive the height adjustment mechanism (3) to operate through the synchronous drive mechanism (2). When the height adjustment mechanism (3) operates, it drives the pressing platform (4) to move towards the supporting platform (1) until the pressing platform (4) contacts the upper end surface of the concrete test piece and generates a set value of pressure, and a sealed test chamber is formed above the concrete test piece. Step 300: Open the exhaust assembly, and pour a set amount of chlorine-containing solution into the test chamber through the liquid guiding mechanism (7); Step 400: Drive the volume adjustment assembly to move towards the concrete test piece through the auxiliary adjustment mechanism (6) until the gas in the test chamber is completely exhausted, and then close the exhaust assembly; Step 500: Continuously drive the volume adjustment assembly to move towards the concrete test piece through the auxiliary adjustment mechanism (6) until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value; Step 600: Real-time monitor the hydraulic pressure and chloride ion concentration of the chlorine-containing solution in the test chamber through the data monitoring mechanism (8). When the hydraulic pressure decreases, drive the volume adjustment assembly to continue moving towards the concrete test piece through the auxiliary adjustment mechanism (6) until the hydraulic pressure of the chlorine-containing liquid in the test chamber reaches the set value. When the hydraulic pressure reaches the set value and the chloride ion concentration of the chlorine-containing solution is higher or lower than the set range, pour a set amount and set concentration of chlorine-containing solution into the test chamber through the liquid guiding mechanism (7).

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