Concrete impermeability test device and method

Abstract

The present invention belongs to the technical field of anti-seepage performance test, and particularly relates to a concrete anti-seepage performance test device and method, including a device body, a workbench and a columnar test mold, the test mold including a fixed mold connected to the workbench as a whole and a movable mold sliding on the workbench, an infrared camera for collecting infrared images of concrete specimens in the test mold is arranged above the test mold; a seepage table with a seepage groove on the upper surface is arranged at the bottom of the test mold, the middle of the seepage groove is connected to a water inlet pipe and a valve through a water outlet, a component one is arranged at the center of the outlet axis, a channel is formed between the water outlet and the valve, a component two is arranged on one side of the channel, and component two uses a movable mold to approach the fixed mold to detect the air tightness of the seepage table and the test mold. The test device of the present invention does not need to use hydraulic equipment to press the specimen and the test mold, and there is no need to tighten a large number of screws. When in use, the specimen is directly placed in the seepage table, and then the fixed mold and the movable mold are fixed.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-seepage performance testing, and in particular relates to a device and method for testing the anti-seepage performance of concrete. Background Art

[0002] The impermeability of concrete is a basic property of concrete and an important feature of concrete durability. The impermeability of concrete not only represents the ability of concrete to resist water flow, but also affects the concrete's resistance to carbonation and chloride ion penetration. The impermeability grade is determined by the maximum water pressure that a 28-day-old standard specimen can withstand when tested according to the standard test method.

[0003] GB50164-2011 "Concrete Quality Control Standard" has clear provisions on how to conduct concrete impermeability tests: the test piece is cured until the day before the test, then taken out and the surface is dried, and then a layer of molten sealing material is applied on its side. The test piece is then pressed into a test piece sleeve preheated in an oven on a pressurizing device. After cooling slightly, the pressure is released; the test piece is placed on a permeability tester together with the test piece sleeve for testing; starting with a water pressure of 0.1MPa, the water pressure is increased by 0.1MPa every 8 hours, and attention is paid to observing the water seepage on the end faces of the test pieces at any time; when 3 out of 6 test pieces have water seepage on their end faces, the test is stopped and the water pressure at that time is recorded; during the test, if water is found to seep out from the periphery of the test piece, the test is stopped and the test piece is resealed. According to the maximum water pressure that concrete specimens can withstand during the permeability test, the permeability grade of concrete is divided into five grades: P4, P6, P8, P10, and P12, which correspondingly represent the different maximum water pressures when 4 specimens in a group of 6 specimens do not experience water seepage during the concrete permeability test.

[0004] Traditional concrete is placed in a permeability test device (such as Figure 7 The test requires multiple operations, such as applying sealing materials on the side of the specimen, inserting the specimen into a mold through hydraulic equipment, etc. In the prior art, the concrete specimen is placed on the seepage platform of the test device after being molded, and then tightened with at least six screws to fix it. The operation is cumbersome and the air tightness of the device as a whole cannot be guaranteed. Therefore, a concrete anti-permeability performance test device and method are proposed. Summary of the invention

[0005] In order to solve the above problems, the primary purpose of the present invention is to provide a concrete anti-permeability performance testing device and method.

[0006] The above purpose is achieved by the following preparation process:

[0007] The present invention provides a concrete anti-permeability performance test device, comprising a device body, a workbench and a columnar test mold, wherein the test mold comprises a fixed mold integrally connected to the workbench and a movable mold sliding on the workbench, and an infrared camera for collecting infrared images of concrete specimens in the test mold is arranged above the test mold;

[0008] A water seepage platform with a water seepage groove on its upper surface is provided at the bottom end of the test mold, a water inlet pipe and a valve are connected to the middle of the water seepage groove through a water outlet, a component one for blocking the water outlet is provided at the center of the water outlet axis, a channel is formed between the water outlet and the valve, a component two for detecting air tightness is provided on one side of the channel, and the component two uses a movable mold to approach the fixed mold to detect the air tightness of the water seepage platform and the test mold before the test begins.

[0009] As a further improvement of the above technical solution: it also includes a telescopic device and a telescopic member driven by the telescopic device, and one end of the telescopic member is located on the outer wall of the movable mold.

[0010] As a further improvement of the above technical solution: the upper surface of the workbench is provided with a movable groove matching the movable mold, and the upper end of the movable groove is provided with at least two groups of sliding grooves for limiting the movable mold to the left and right.

[0011] As a further improvement of the above technical solution: Component 2 includes a sealing cylinder located at the lower end of the movable mold, a piston rod located at the front end of the sealing cylinder, and an air inlet located at the lower end of the seepage platform and connected to the channel, one end of the piston rod is connected to the inner wall of the sealing cylinder through a first spring, and the other end is located in the air inlet.

[0012] As a further improvement of the above technical solution: the upper surface of the sealing cylinder located outside the movable mold is provided with an observation port with scale.

[0013] As a further improvement of the above technical solution: the component 1 includes a center piece located at the center of the water outlet axis, an elastic plug connected to the lower end of the center piece through a second spring and used to block the channel, and a water outlet net located at the lower end of the center piece for connecting the channel and the water outlet.

[0014] As a further improvement of the above technical solution: the opposite surfaces of the fixed mold and the movable mold are fixedly provided with a silicone layer, the two opening ends of the movable mold are provided with protrusions, and the two opening ends of the fixed mold are provided with grooves matching the protrusions.

[0015] As a further improvement of the above technical solution: extension plates are provided on the outer walls of the two open ends of the fixed mold and the movable mold, the extension plate of the fixed mold is provided with a convex column facing the movable mold, the extension plate of the movable mold is provided with a convex cylinder facing away from the fixed mold and matching the convex column, and a third spring is provided inside the convex cylinder to resist the convex column.

[0016] As a further improvement of the above technical solution: a rotating seat and a rotating rod are provided on the outer wall of the fixed mold, and the infrared camera is located on the rotating rod.

[0017] The present invention also provides a concrete anti-permeability performance test method, using the above concrete anti-permeability performance test device, the device body also includes a main control module, a data transmission module, the test method includes the following steps:

[0018] (1) Place the cylindrical specimen on the seepage table, fit the inner wall to the fixed mold, and then move the movable mold toward the specimen and the fixed mold until they are fixed. After testing the air tightness, move the infrared camera to the top of the specimen;

[0019] (2) Open the valve, increase the water pressure by 0.1 MPa every 8 hours from the water pressure of 0.1 MPa, and fill the seepage tank with water. During the water filling process, use the infrared camera to collect the infrared image of the test piece and transmit it to the main control module for digital conversion, and then transmit it to the computer through the data transmission module;

[0020] (3) The digital infrared image is compared and analyzed by the comparison and analysis detection system on the computer to obtain real-time test piece water seepage data, wherein the comparison and analysis uses an image recognition algorithm to infer the test piece leakage according to the speed of temperature change in the temperature cloud map of the infrared image. When the real-time test piece water seepage data exceeds the computer setting value, the computer determines that the test piece is leaking. When 3 out of 6 test pieces are leaking, the test is stopped, and the computer sends a command to the main control module to control the valve to close. The computer records the water pressure H at that time and calculates the concrete anti-seepage grade S according to the following formula:

[0021] S=10H-1

[0022] The unit of H is MPa.

[0023] The beneficial effects of the present invention are:

[0024] (1) Compared with the traditional test piece molding, it is simpler and more convenient. After the traditional time curing molding, a layer of sealing material is first applied to the side wall, and then placed in the test mold, and then the test piece and the test mold are pressed by hydraulic equipment, and the whole is aligned with at least six groups of studs on the working table of the test device and placed above the seepage table, and then the screws are tightened respectively. The test device of the present invention does not need to use hydraulic equipment to press the test piece and the test mold, and there is no need to tighten a large amount of screws. When in use, the test piece is directly placed in the seepage table, and then the fixed mold and the movable mold are fixed.

[0025] (2) Compared with the traditional test piece mold which needs to apply sealing material, the present invention provides a silicone layer on the inner wall of the test mold. On the one hand, it can prevent the test piece from seeping into the test mold and affecting the surface of the test mold. On the other hand, it has an excellent sealing effect on the movable mold, the fixed mold and the water seepage platform as a whole. At the same time, it also facilitates the demolding of the test piece from the test mold.

[0026] (3) In the process of fixing the test piece on the test mold in the present invention, it is necessary to push the movable mold toward the fixed mold. When the valve is closed, component two gradually approaches the channel. Due to the obstruction of the upper test piece, if the air tightness is good, component one is lifted up. If the air tightness is not good, the thrust will be large or small during the pushing process. When the movable mold and the fixed mold are completely fixed, if the air tightness is still excellent, component two will not be displaced. If the air tightness is not good, component two will be displaced. The sealing test can be accurately performed before the test is performed, avoiding water seepage during the test, and the need to re-prepare the test piece and the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of the concrete anti-permeability performance testing device of the present invention;

[0028] Figure 2 is a top view of a concrete anti-permeability test device according to the present invention;

[0029] Figure 3 It is a schematic diagram of a test mold and its bottom structure of a concrete anti-permeability performance test device of the present invention;

[0030] Figure 4 The invention is a concrete anti-permeability test device Figure 3 A magnified image of point A;

[0031] Figure 5 It is a top view schematic diagram of the fixed mold and the movable mold of the concrete anti-permeability performance testing device of the present invention;

[0032] Figure 6 It is a top view schematic diagram of the fixed mold and movable mold combination of the concrete anti-permeability performance testing device of the present invention;

[0033] Figure 7 The utility model is an existing concrete anti-permeability performance testing device.

[0034] Illustration: 1. Device body; 2. Workbench; 3. Test mold; 4. Fixed mold; 5. Movable mold; 6. Infrared camera; 7. Seepage platform; 8. Seepage groove; 9. Water outlet; 10. Water inlet pipe; 11. Valve; 12. Silicone layer; 13. Telescopic device; 14. Telescopic member; 15. Channel; 16. Movable groove; 17. Slide groove; 18. Sealing cylinder; 19. Piston rod; 20. First spring; 21. Air inlet; 22. Elastic plug; 23. Second spring; 24. Center piece; 25. Water outlet net; 26. Observation port; 27. Bump; 28. Groove; 29. ​​Extension plate; 30. Boss; 31. Boss; 32. Third spring; 33. Rotating seat; 34. Rotating rod. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0036] like Figure 1-3 As shown, the concrete anti-seepage performance test device of this embodiment includes a device body 1, a workbench 2 and a columnar test mold 3, the test mold 3 includes a fixed mold 4 integrally connected to the workbench 2 and a movable mold 5 sliding on the workbench 2, the upper surface of the workbench 2 is provided with a movable groove 16 matching the movable mold 5, the upper end of the movable groove 16 is provided with at least two groups of slide grooves 17 for limiting the movable mold 5 to the left and right, one end of the telescopic member 14 is located on the outer wall of the movable mold 5, the bottom end of the test mold 3 is provided with a seepage table 7 with a seepage groove 8 on the upper surface, the middle of the seepage groove 8 is connected to the water inlet pipe 10 and the valve 11 through the water outlet 9, the present embodiment also includes a telescopic device 13 and a telescopic member 14 driven by it, the movable mold 5 is squeezed with the fixed mold 4 through the telescopic member 14, and the fixed mold 4 is squeezed and fixed, wherein the telescopic device 13 is driven by hydraulic pressure or the like, and in other embodiments, the movable mold 5 and the fixed mold 4 can also be fixed by buckles or clamps.

[0037] like Figure 4-6As shown, the opposite surfaces of the fixed mold 4 and the movable mold 5 are fixedly provided with a silicone layer 12, the two open ends of the movable mold 5 are provided with a convex block 27, and the two open ends of the fixed mold 4 are provided with a groove 28 matching the convex block 27. When the movable mold 5 and the fixed mold 4 are pressed and fixed, the convex block 27 is stuck in the groove 28. Under the action of the silicone layer 12, the movable mold 5 and the fixed mold 4 are tightly fitted, and the bottom end of the movable mold 5 is fitted with the outer wall of the water seepage platform 7, which can achieve an excellent sealing effect and prevent the test piece from seeping into the test piece from affecting the surface of the test mold 3. At the same time, it is also convenient for the test piece to be demolded from the test mold when the test is finished; the outer walls of the two open ends of the fixed mold 4 and the movable mold 5 are provided with an extension plate 29, and the extension plate 29 of the fixed mold 4 is provided with a The convex cylinder 31 facing away from the fixed mold 4 and matching with the convex cylinder 30 is provided on the extension plate 29 of the movable mold 5, and the interior of the convex cylinder 31 is provided with a third spring 32 which abuts against the convex cylinder 30. When the movable mold 5 and the fixed mold 4 are pressed and fixed, the convex cylinder 30 of the fixed mold 4 enters the interior of the convex cylinder 31 of the movable mold 5 and slowly squeezes the third spring 32. On the one hand, it is convenient for positioning the fixed mold 4 and the movable mold 5, and on the other hand, it increases the connection stability between the two. At the same time, when demolding, when the telescopic device 13 removes the extrusion force, due to the elastic force of the third spring 32, the movable mold 5 automatically bounces off the fixed mold 4, which is convenient for demolding. There is no need to take down the test piece and the test mold as a whole, and the hydraulic device is used for demolding again.

[0038] After the specimen is cured, it is directly placed on the seepage table 7, with the specimen and the seepage groove 8 located on the same axis. Then, by starting the telescopic device 13, the telescopic member 14 pushes the movable mold 5 gradually toward the fixed mold 4 until it is completely fixed. After the seal is detected, the valve 11 is opened, and the water in the water tank of the device body 1 is pressurized and then seeps out from the water outlet 9 through the water inlet pipe 10 and seeps into the seepage groove 8 at the upper end of the seepage table 7, and the seepage test of the specimen is started.

[0039] like Figure 4As shown, a channel 15 is formed between the water outlet 9 and the valve 11, and a component 1 for blocking the water outlet 9 is provided at the center of the axis of the water outlet 9. The component 1 includes a center piece 24 located at the center of the axis of the water outlet 9, an elastic plug 22 connected to the lower end of the center piece 24 through a second spring 23 and used to block the channel 15, and a water outlet net 25 located at the lower end of the center piece 24 and used to connect the channel 15 and the water outlet 9. When the valve 11 opens the channel 15 to allow water to enter, the water pressure pushes the elastic plug 22 up to the center piece 24, water enters the water outlet 9 from the water outlet net 25, and when the valve 11 is closed, the elastic plug 22 falls to block the channel 15; a component 2 for detecting air tightness is provided on one side of the channel 15, and the component 2 includes a sealing cylinder 18 located at the lower end of the movable mold 5, a piston rod 19 located at the front end of the sealing cylinder 18, and an air inlet 21 located at the lower end of the seepage platform 7 and connected to the channel 15. One end of the piston rod 19 is connected to the inner wall of the sealing cylinder 18 through a first spring 20, and the other end is located in the air inlet 21. , the upper surface of the sealing cylinder 18 located on the outer side of the movable mold 5 is provided with an observation port 26 with a scale. When the test piece is placed on the seepage table 7, a quasi-sealed space is formed, and the movable mold 5 is moved. The movable mold 5 drives the piston rod 19 at the bottom end of the sealing cylinder 18 to move toward the air inlet 21. The channel 15 is located above the valve 11. At this time, the valve 11 is not opened, and the piston rod 19 squeezes the gas in the channel 15 and the air inlet 21, so that the elastic plug 22 above the channel 15 is lifted. When the piston rod 19 moves to the rightmost end of the air inlet 21, the movable mold 5 is just fixed to the fixed mold 4. After being fixed, it stays for a while. If the overall sealing effect of the test mold 3 is not good, the air pressure in the seepage groove 8 and the water outlet 9 gradually recovers, and the elastic member 22 will gradually move downward, causing the piston rod 19 to retreat. The change of the first spring 20 can be seen from the observation port 26, so as to check the air tightness. The sealing test can be accurately carried out before the test is carried out to avoid water seepage during the test.

[0040] An infrared camera 6 for collecting infrared images of the concrete specimen in the test mold 3 is provided above the test mold 3. A rotating seat 33 and a rotating rod 34 are provided on the outer wall of the fixed mold 4. The infrared camera 6 is located on the rotating rod 34 and is rotated to one side when the specimen is installed. After installation, the infrared camera 6 is rotated to the top of the specimen to facilitate the collection of infrared image data of the specimen.

[0041] The concrete anti-permeability performance test method of this embodiment uses a concrete anti-permeability performance test device, the device body 1 also includes a main control module and a data transmission module, and the test method includes the following steps:

[0042] (1) Place the columnar specimen on the water seepage platform 7, with the inner wall fitting the fixed mold 4, and then move the movable mold 5 toward the specimen and the fixed mold 4 until they are fixed. After testing the air tightness, move the infrared camera 6 to the top of the specimen;

[0043] (2) The computer sends a command to the main control module to control the opening of the valve 11, and the water pressure is increased by 0.1 MPa every 8 hours from the water pressure of 0.1 MPa, and water is injected into the seepage tank 8. During the water injection, the infrared camera 6 is used to collect the infrared image of the test piece and transmit it to the main control module for digital conversion, and then to the computer through the data transmission module; the computer is a control terminal, and can also be a mobile phone.

[0044] (3) The digital infrared image is compared and analyzed by a comparison and analysis detection system on a computer to obtain real-time test piece water seepage data, wherein the comparison and analysis uses an image recognition algorithm to infer the test piece leakage according to the speed of temperature change in the temperature cloud map of the infrared image. When the real-time test piece water seepage data exceeds the computer set value, the computer determines that the test piece is leaking. When three of the six test pieces are leaking, the test is stopped, and a command is sent to the main control module to control the valve 11 to be closed. The computer records the water pressure H at that time and calculates the concrete anti-seepage grade S according to the following formula:

[0045] S=10H-1

[0046] The unit of H is MPa.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A concrete impermeability test device, comprising a device body (1), a workbench (2) and a columnar test mold (3), characterized in that: The test mold (3) comprises a fixed mold (4) integrally connected to the workbench (2) and a movable mold (5) sliding on the workbench (2); an infrared camera (6) for collecting infrared images of concrete specimens in the test mold (3) is provided above the test mold (3); The bottom end of the test mold (3) is provided with a water seepage platform (7) with a water seepage groove (8) on its upper surface, the middle of the water seepage groove (8) is connected to a water inlet pipe (10) and a valve (11) via a water outlet (9), a component 1 for blocking the water outlet (9) is provided at the center of the axis of the water outlet (9), a channel (15) is formed between the water outlet (9) and the valve (11), and a component 2 for detecting air tightness is provided on one side of the channel (15), and the component 2 uses the movable mold (5) to approach the fixed mold (4) to detect the air tightness of the water seepage platform (7) and the test mold (3) before the test starts; The second component comprises a sealing cylinder (18) located at the lower end of the movable mold (5), a piston rod (19) located at the front end of the sealing cylinder (18), and an air inlet (21) located at the lower end of the water seepage platform (7) and connected to the channel (15); one end of the piston rod (19) is connected to the inner wall of the sealing cylinder (18) via a first spring (20), and the other end is located in the air inlet (21); The upper surface of the sealing cylinder (18) located outside the movable mold (5) is provided with a graduated observation port (26); The first component comprises a center piece (24) located at the center of the axis of the water outlet (9), an elastic plug (22) connected to the lower end of the center piece (24) via a second spring (23) and used to block the channel (15), and a water outlet net (25) located at the lower end of the center piece (24) and used to connect the channel (15) and the water outlet (9); The opposite surfaces of the fixed mold (4) and the movable mold (5) are both fixedly provided with a silicone layer (12).

2. The concrete anti-permeability test device according to claim 1, characterized in that: The concrete anti-permeability performance testing device also includes a telescopic device (13) and a telescopic member (14) driven by the device, wherein one end of the telescopic member (14) is located on the outer wall of the movable mold (5).

3. The concrete anti-permeability testing device according to claim 1 is characterized in that: The upper surface of the workbench (2) is provided with a movable groove (16) matching the movable mold (5), and the upper end of the movable groove (16) is provided with at least two groups of sliding grooves (17) for limiting the movable mold (5) to the left and right.

4. The concrete anti-permeability testing device according to claim 1, characterized in that: Both open ends of the movable mold (5) are provided with protrusions (27), and both open ends of the fixed mold (4) are provided with grooves (28) matching the protrusions (27).

5. The concrete anti-permeability testing device according to claim 1, characterized in that: Extension plates (29) are provided on the outer walls of both open ends of the fixed mold (4) and the movable mold (5); the extension plate (29) of the fixed mold (4) is provided with a convex column (30) facing the movable mold (5); the extension plate (29) of the movable mold (5) is provided with a convex cylinder (31) facing away from the fixed mold (4) and matching the convex column (30); a third spring (32) is provided inside the convex cylinder (31) and abuts against the convex column (30).

6. The concrete anti-permeability test device according to claim 1, characterized in that: A rotating seat (33) and a rotating rod (34) are provided on the outer wall of the fixed mold (4), and the infrared camera (6) is located on the rotating rod (34).

7. A method for testing the impermeability of concrete, using the device for testing the impermeability of concrete according to any one of claims 1 to 6, wherein the device body (1) further comprises a main control module and a data transmission module, and is characterized in that: The test method comprises the following steps: (1) Place a columnar test piece on a water seepage table (7) with the inner wall fitted to the fixed mold (4), then move the movable mold (5) toward the test piece and the fixed mold (4) until they are fixed. After testing the air tightness, move the infrared camera (6) to the top of the test piece; (2) opening the valve (11), increasing the water pressure by 0.1 MPa every 8 hours from a water pressure of 0.1 MPa, and injecting water into the seepage tank (8). During the injection of water, the infrared camera (6) is used to collect infrared images of the test piece and transmit them to the main control module for digital conversion, and then transmit them to the computer through the data transmission module; (3) The digital infrared image is compared and analyzed by the comparison and analysis detection system on the computer to obtain real-time specimen water seepage data. When the real-time specimen water seepage data exceeds the computer setting value, the computer determines that the specimen is leaking. When 3 out of 6 specimens are leaking, the test is stopped and the computer sends a command to the main control module to control the valve (11) to close. The computer records the water pressure H at that time and calculates the concrete anti-seepage grade S according to the following formula: S = 10H-1; Wherein, the unit of H is MPa.

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