CN114813503A - Concrete impermeability test device and method - Google Patents

Abstract

The invention belongs to the technical field of impermeability tests, and particularly relates to a concrete impermeability test device and a method, wherein the concrete impermeability test device comprises a device main body, a workbench and a columnar test mold, the test mold comprises a fixed mold integrally connected with the workbench and a movable mold sliding on the workbench, and an infrared camera for acquiring an infrared image of a concrete test piece in the test mold is arranged above the test mold; the bottom of examination mould is equipped with the infiltration platform that the infiltration groove was seted up to the upper surface, and the centre of infiltration groove is through delivery port connection inlet tube and valve, and delivery port axis center is equipped with subassembly one, forms the passageway between delivery port and the valve, and one side of passageway is equipped with subassembly two, and subassembly two utilizes the movable mould to be close to the gas tightness that detects infiltration platform and examination mould to the fixed mould. The test device does not need to use hydraulic equipment to compress the test piece and the test die, does not need to work by screwing a large number of screws, and can be used by directly putting the test piece into a water seepage table and fixing the fixed die and the movable die.

Description

A kind of concrete impermeability test device and method

technical field

The invention belongs to the technical field of impermeability performance testing, and particularly relates to a concrete impermeability performance testing device and method.

Background technique

The impermeability of concrete is the basic performance of concrete and an important feature of concrete durability. The impermeability of concrete not only characterizes the ability of concrete to resist water flow through, but also affects the properties of concrete such as carbonization resistance and chloride ion penetration resistance. The impermeability grade is determined by the maximum water pressure that the 28-day-old standard specimen can withstand when tested according to the standard test method.

GB50164-2011 "Concrete Quality Control Standard" clearly stipulates how to carry out the concrete impermeability test: the specimen is cured until it is taken out one day before the test, the surface is dried, and then a layer of melted sealing material is applied on the side of the test piece, and then the test piece is added. On the pressing device, press the test piece into the preheated test piece cover of the oven, and after a little cooling, release the pressure; together with the test piece cover, test on the impermeability tester; starting from the water pressure of 0.1MPa, and then every other Increase the water pressure by 0.1MPa for 8 hours, and observe the water seepage on the end face of the test piece at any time; when there is water seepage on the end face of 3 of the 6 test pieces, stop the test and record the water pressure at that time; during the test, if it is found that If water seeps out from the periphery of the test piece, stop the test and reseal it. According to the maximum water pressure that the concrete specimen can withstand during the impermeability test, the impermeability grade of concrete is divided into five grades: P4, P6, P8, P10, P12, etc., corresponding to a group of 6 test pieces during the concrete impermeability test. The maximum water pressure of the four specimens without water seepage occurs.

When the traditional concrete is put into the impermeability test device (as shown in Figure 7), many operations are required, such as smearing sealing material on the side of the test piece, loading the test piece through hydraulic equipment, etc. After the test piece is put into the mold, it is placed on the water seepage platform of the test device, and then at least six screws are tightened to fix it. The operation is cumbersome and the overall airtightness of the device cannot be guaranteed. Therefore, a test device and method for the impermeability of concrete are proposed.

SUMMARY OF THE INVENTION

In order to solve the above problems, the primary purpose of the present invention is to provide a concrete impermeability test device and method.

The above purpose is achieved by the following preparation process:

The invention provides a concrete impermeability test device, which includes a device main body, a workbench and a column-shaped trial mode, the trial mode includes a fixed mode integrally connected with the worktable and a movable mode that slides on the worktable. There is an infrared camera above the test mold for collecting infrared images of the concrete specimen in the test mold;

The bottom end of the test mold is provided with a water seepage table with a water seepage groove on the upper surface, the middle of the water seepage groove is connected to the water inlet pipe and the valve through the water outlet, and the center of the water outlet axis is provided with a component for blocking the water outlet, A channel is formed between the water outlet and the valve, and one side of the channel is provided with a second component for testing air tightness. tightness.

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

As a further improvement of the above technical solution, the upper surface of the worktable is provided with a movable groove matching the movable mold, and the upper end of the movable groove is provided with at least two sets of runners for limiting the left and right positions of the movable mold.

As a further improvement of the above technical solution: the second component 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 water seepage table and communicated with the channel. A spring is connected with the inner wall of the sealing cylinder, and the other end is located in the air inlet.

As a further improvement of the above technical solution, the upper surface of the sealing cylinder located on the outer side of the movable mold is provided with an observation port with a scale.

As a further improvement of the above technical solution: the first component includes a central piece located at the center of the axis of the water outlet, an elastic plug connected to the lower end of the central piece through a second spring and used to block the passage, and a lower end of the central piece for communicating the passage and The water outlet network of the water outlet.

As a further improvement of the above technical solution: the opposite surfaces of the fixed mold and the movable mold are fixed with a silica gel layer, the two open ends of the movable mold are provided with bumps, and the two open ends of the fixed mold are provided with The bumps match the grooves.

As a further improvement of the above technical solution: the outer walls of the two open ends of the fixed die and the movable die are provided with extension plates, the extension plates of the fixed die are provided with convex columns facing the movable die, and the extension plates of the movable die are provided with extending plates. The plate is provided with a protruding cylinder facing away from the fixed die and matching with the protruding post, and the interior of the protruding cylinder is provided with a third spring which abuts against the protruding post.

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

The present invention also provides a concrete impermeability test method, using the concrete impermeability test device, the main body of the device further includes a main control module and a data transmission module, and the test method includes the following steps:

(1) Put the columnar specimen on the water seepage table, fit the inner wall with the fixed mold, and then move the movable mold toward the specimen and the fixed mold until it is fixed. After checking the air tightness, move the infrared camera to the top of the specimen. ;

(2) Open the valve, increase the water pressure by 0.1MPa every 8 hours since the water pressure is 0.1MPa, inject water into the water seepage tank, and use the infrared camera to collect the infrared image of the test piece and transmit it to the main control module for digital conversion during water injection. And through the data transmission module to the computer;

(3) Compare and analyze the digitized infrared images by the comparative analysis and detection system on the computer, and obtain the real-time water seepage data of the specimen, wherein the comparative analysis is to use the image recognition algorithm to calculate the speed of the temperature change according to the temperature cloud map of the infrared image. When the leakage of the test piece is detected, when the real-time water seepage data of the test piece exceeds the set value of the computer, the computer will judge the water seepage of the test piece. The control module controls the valve to close, the computer records the water pressure H at that time, and calculates the concrete impermeability mark S according to the following formula:

S=10H-1

Wherein, the unit of H is MPa.

The beneficial effects of the present invention are:

(1) Compared with the traditional test piece, it is simpler and more convenient to install the mold. After the traditional time curing and forming, first coat a layer of sealing material on the side wall, then put it into the test mold, and then use the hydraulic equipment to test the test piece and test mold. Carry out compression, align it with at least six groups of studs on the workbench of the test device and put them above the seepage table, and then tighten the screws respectively. The test device of the present invention does not need to use hydraulic equipment to compress the test piece and the test mold. There is no work to tighten the screws a lot. When using, directly put the test piece into the seepage table, and then fix the fixed mold and movable mold.

(2) Compared with the traditional test piece assembling, the sealing material needs to be smeared, the present invention is provided with a silica gel layer on the inner wall of the test mold, on the one hand, it can prevent the water seepage of the test piece from affecting the surface of the test mold, and on the other hand, the movable mold and The fixed mold and the seepage table as a whole have an excellent sealing effect, and at the same time, it is also convenient for the test piece to be released from the test mold.

(3) In the present invention, in the process of fixing the test piece in the test mold, it is necessary to push the movable mold toward the fixed mold. When the valve is closed, the second component gradually approaches the channel. If the air tightness is good, the first component is lifted. If the air tightness is not good, the thrust will be large and small during the pushing process. When the movable mold and the fixed mold are completely fixed, if the air tightness is still excellent, the second component will not be generated. If the air tightness is not good, the second component will be displaced, and the tightness detection can be carried out accurately before the test is carried out to avoid water seepage during the test process, and it is necessary to re-prepare the test piece and the test process.

Description of drawings

Fig. 1 is the front view of the concrete impermeability test device of the present invention;

Fig. 2 is the top view of the concrete impermeability test device of the present invention;

Fig. 3 is the test mould of the concrete impermeability test device of the present invention and its bottom end structure schematic diagram;

Fig. 4 is the enlarged view of place A of Fig. 3 of concrete impermeability test device of the present invention;

5 is a schematic plan view of the unfolded top view of the fixed mold and the movable mold of the concrete impermeability test device of the present invention;

6 is a schematic top view of a fixed mold and a movable mold assembly of the concrete impermeability test device of the present invention;

Fig. 7 is the existing concrete impermeability test device.

Illustration: 1. Main body of the device; 2. Workbench; 3. Trial mold; 4. Fixed mold; 5. Active mold; 6. Infrared camera; 7. Water seepage table; 8. Water seepage tank; 9. Water outlet; 10, Inlet pipe; 11, valve; 12, silicone layer; 13, telescopic device; 14, telescopic piece; 15, channel; 16, movable groove; 17, chute; 18, sealing cylinder; 19, piston rod; 20, first Spring; 21, air inlet; 22, elastic plug; 23, second spring; 24, center piece; 25, water outlet; 26, observation port; 27, bump; 28, groove; 29, extension plate; 30 , convex column; 31, convex cylinder; 32, third spring; 33, rotating seat; 34, rotating rod.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and should not be construed as limiting the protection scope of the application. Those skilled in the art can The above application content makes some non-essential improvements and adjustments to this application.

As shown in Figures 1-3, the concrete impermeability test device of this embodiment includes a device main body 1, a workbench 2 and a column-shaped trial mould 3. The trial mould 3 includes a fixed mould 4 integrally connected with the workbench 2 and a The movable mold 5 slides on the worktable 2. The upper surface of the worktable 2 is provided with a movable groove 16 that matches the movable mold 5. The upper end of the movable groove 16 is provided with at least two sets of sliding grooves 17 for limiting the left and right positions of the movable mold 5. One end of the telescopic piece 14 is located on the outer wall of the movable mold 5, and the bottom end of the trial mold 3 is provided with a water seepage table 7 with a water seepage groove 8 on the upper surface. The embodiment also includes a telescopic device 13 and its driven telescopic element 14. The movable die 5 is extruded with the fixed die 4 through the telescopic element 14, and the fixed die 4 is extruded and fixed. The telescopic device 13 is driven by hydraulic pressure, etc. In other embodiments, the movable mold 5 and the fixed mold 4 can also be fixed by means of buckles and clamps.

As shown in Figures 4-6, the opposite surfaces of the fixed mold 4 and the movable mold 5 are fixedly provided with a silica gel layer 12, the two open ends of the movable mold 5 are provided with bumps 27, and the two open ends of the fixed mold 4 are provided with When the movable mold 5 and the fixed mold 4 are pressed tightly, the protrusion 27 is stuck in the groove 28, and under the action of the silicone layer 12, the movable mold 5 and the fixed mold 4 are tightly attached The bottom end of the movable mold 5 is attached to the outer wall of the water seepage table 7, which can have an excellent sealing effect, and can prevent the water seepage of the test piece from affecting the surface of the test mold 3. The mold is demolded; the outer walls of the two open ends of the fixed mold 4 and the movable mold 5 are provided with extension plates 29, and the extension plate 29 of the fixed mold 4 is provided with a convex column 30 facing the movable mold 5, and the extension plate of the movable mold 5 is provided with 29 is provided with a convex cylinder 31 facing away from the fixed die 4 and matching with the convex column 30. The interior of the convex cylinder 31 is provided with a third spring 32 which is opposed to the convex column 30. The movable die 5 and the fixed die 4 are pressed and fixed. At the same time, the convex column 30 of the fixed die 4 enters the interior of the convex cylinder 31 of the movable die 5, and slowly squeezes the third spring 32, which facilitates the positioning of the fixed die 4 and the movable die 5 on the one hand, and increases the connection stability of the two on the other hand. , when demoulding, when the expansion device 13 removes the pressing force, due to the elastic force of the third spring 32, the movable die 5 automatically bounces off the fixed die 4, which is convenient for demoulding, and there is no need to take the test piece and the test die as a whole. Next, demold again using hydraulics.

After the test piece has been cured, directly put the test piece on the seepage table 7, and the test piece and the seepage tank 8 are located on the same axis. Then, by starting the telescopic device 13, the telescopic piece 14 pushes the movable mold 5 to gradually approach the fixed mold 4 until it reaches the fixed mold 4. Completely fixed, after testing the sealing, open the valve 11, the water in the water tank of the device main body 1 seeps out from the water outlet 9 through the water inlet pipe 10 after being pressurized, and penetrates into the water seepage tank 8 at the upper end of the water seepage table 7, and the test piece is started. Water seepage test.

As shown in FIG. 4 , 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 in the center of the axis of the water outlet 9 . The second spring 23 is connected to the lower end of the central piece 24 and is used to block the elastic plug 22 of the channel 15 and the water outlet net 25 located at the lower end of the central piece 24 for communicating the channel 15 and the water outlet 9. When the valve 11 opens the channel 15 and enters the water, The water pressure lifts the elastic plug 22 to the center piece 24, and the water enters the water outlet 9 from the water outlet net 25. When the valve 11 is closed, the elastic plug 22 falls to block the channel 15; The second component 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 water seepage table 7 and communicated with the channel 15. One end of the piston rod 19 passes through The first spring 20 is connected to the inner wall of the sealing cylinder 18, 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 a scaled observation port 26. When the test piece is placed on the water seepage table 7 Then, a quasi-sealed space is formed, the movable die 5 is moved, and the movable die 5 drives the piston rod 19 at the bottom of the sealing cylinder 18 to move toward the air inlet 21, and the passage 15 is located above the valve 11. At this time, the valve 11 is not opened, and the piston rod 19 is squeezed. Press the gas in the channel 15 and the air inlet 21, so that the elastic plug 22 above the channel 15 is pushed up. When the piston rod 19 moves to the rightmost end of the air inlet 21, the movable mold 5 is just fixed with the fixed mold 4, and it is fixed. After staying for a while, if the overall sealing effect of the test mold 3 is not good, the air pressure in the water seepage groove 8 and the water outlet 9 will gradually recover, and the elastic member 22 will gradually move downward, so that the piston rod 19 will retreat, which can be seen from the observation port 26. When the first spring 20 changes, the air tightness can be checked, and the tightness can be accurately checked before the test to avoid water seepage during the test.

An infrared camera 6 is arranged above the test mold 3 for collecting infrared images of concrete specimens in 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. When the test piece is turned to one side, after the installation is completed, the infrared camera 6 is turned to be directly above the test piece, so as to facilitate the collection of infrared image data of the test piece.

The concrete impermeability test method of the present embodiment utilizes a concrete impermeability test device. The device main body 1 further includes a main control module and a data transmission module, and the test method includes the following steps:

(1) Put the cylindrical test piece on the water seepage table 7, the inner wall is attached to the fixed mold 4, and then move the movable mold 5 to the test piece and the fixed mold 4 until it is fixed. After checking the air tightness, move the infrared camera 6. to the top of the test piece;

(2) The computer sends an instruction to the main control module to control the opening of the valve 11, increase the water pressure by 0.1 MPa every 8 hours since the water pressure is 0.1 MPa, and inject water into the seepage tank 8. During the water injection, the infrared camera 6 is used to collect the data of the specimen at regular intervals. The infrared image is transmitted to the main control module for digital conversion, and is transmitted to the computer through the data transmission module; the computer belongs to the control terminal and can also be a mobile phone.

(3) Compare and analyze the digitized infrared images by the comparative analysis and detection system on the computer, and obtain the real-time water seepage data of the specimen, wherein the comparative analysis is to use the image recognition algorithm to calculate the speed of the temperature change according to the temperature cloud map of the infrared image. When the leakage of the test piece is detected, when the real-time water seepage data of the test piece exceeds the set value of the computer, the computer will judge the water seepage of the test piece. The control module controls the valve 11 to close, the computer records the water pressure H at that time, and calculates the concrete impermeability mark S according to the following formula:

S=10H-1

Wherein, the unit of H is MPa.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several improvements can be made, which all belong to the protection scope of the present invention.

Claims (10)

1. A concrete impermeability test device, comprising a device main body (1), a workbench (2) and a column-shaped trial mode (3), characterized in that the trial mode (3) includes and the workbench (2) An integrally connected fixed mold (4) and a movable mold (5) slid on the worktable (2), the test mold (3) is provided above the test mold (3) for collecting infrared images of concrete specimens in the test mold (3). camera(6); The bottom end of the test mold (3) is provided with a water seepage table (7) with a water seepage groove (8) on the upper surface, and the middle of the water seepage groove (8) is connected to the water inlet pipe (10) and the valve through the water outlet (9). (11), the center of the axis of the water outlet (9) is provided with a component 1 for blocking the water outlet (9), a channel (15) is formed between the water outlet (9) and the valve (11), and the channel One side of (15) is provided with a component 2 for testing air tightness, the component 2 uses the movable die (5) to approach the fixed die (4) to the water seepage table (7) and the test die (3) before the start of the detection test. Air tightness. 2. The concrete impermeability test device according to claim 1, characterized in that it further comprises a telescopic device (13) and a telescopic element (14) driven by the telescopic element (14), and one end of the telescopic element (14) is located in the movable mold (14). 5) of the outer wall. 3. The concrete impermeability test device according to claim 1, characterized in that: the upper surface of the workbench (2) is provided with a movable groove (16) matching the movable mold (5), and the movable The upper end of the groove (16) is provided with at least two sets of sliding grooves (17) for limiting the left and right positions of the movable mold (5). 4. The concrete impermeability test device according to claim 1, wherein the second component comprises a sealing cylinder (18) located at the lower end of the movable mold (5), a piston rod (18) located at the front end of the sealing cylinder (18). 19), the air inlet (21) located at the lower end of the water seepage table (7) and communicated with the channel (15), one end of the piston rod (19) is connected to the inner wall of the sealing cylinder (18) through the first spring (20), The other end is located in the air inlet (21). 5 . The concrete impermeability test device according to claim 4 , characterized in that: an observation port ( 26 ) with a scale is provided on the upper surface of the sealing cylinder ( 18 ) located outside the movable mold ( 5 ). 6 . 6 . The concrete impermeability test device according to claim 5 , wherein the first component comprises a center piece ( 24 ) located at the center of the axis of the water outlet ( 9 ), a second spring ( 23 ) and the center piece (24) An elastic plug (22) connected to the lower end for blocking the channel (15) and a water outlet net (25) at the lower end of the central piece (24) for communicating the channel (15) and the water outlet (9). 7. The concrete impermeability test device according to claim 1, characterized in that: the opposite surfaces of the fixed mold (4) and the movable mold (5) are fixedly provided with a silica gel layer (12), and the movable mold is provided with a silica gel layer (12). Both open ends of (5) are provided with bumps (27), and both open ends of the fixed die (4) are provided with grooves (28) matching the bumps (27). 8. The concrete impermeability test device according to claim 1, characterized in that: extending plates (29) are provided on the outer walls of the two 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), and the extension plate (29) of the movable mold (5) is provided with a back facing to the stationary mold (4) And a protruding cylinder (31) matched with the protruding post (30), the interior of the protruding cylinder (31) is provided with a third spring (32) which abuts against the protruding post (30). 9. The concrete impermeability 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 form (4), and the infrared camera (6) ) on the pivot lever (34). 10. A concrete impermeability test method, using the concrete impermeability test device according to any one of claims 1-9, the device main body (1) further comprises a main control module and a data transmission module, characterized in that: The test method includes the following steps: (1) Put the cylindrical specimen on the water seepage table (7), fit the inner wall with the fixed mold (4), and then move the movable mold (5) to the specimen and the fixed mold (4) until it is fixed, and check the air tightness After sex, move the infrared camera (6) to just above the test piece; (2) Open the valve (11), increase the water pressure by 0.1MPa every 8 hours since the water pressure is 0.1MPa, inject water into the water seepage tank (8), and use the infrared camera (6) to collect the infrared images of the specimen at regular intervals during water injection It is transmitted to the main control module for digital conversion, and is transmitted to the computer through the data transmission module; (3) Compare and analyze the digital infrared images through the comparative analysis and detection system on the computer to obtain the real-time water seepage data of the test piece. When the real-time water seepage data of the test piece exceeds the set value of the computer, the computer judges that the test piece sees water, and when 6 When three of the test pieces seep water, stop the test, send an instruction from the computer 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 impermeability mark S according to the following formula: S=10H-1 Wherein, the unit of H is MPa.

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