Concrete impermeability sealing instrument, concrete impermeability specimen and its preparation method

Abstract

The present invention discloses a concrete impermeability sealing instrument, a concrete impermeability test specimen and a preparation method thereof. The concrete impermeability test specimen includes a concrete impermeability test specimen body and a permeable test mold. A sealing layer is provided on the surface of the concrete impermeability test specimen body for sealing with the permeable test mold, and the sealing layer is a silica gel layer. In the concrete impermeability test specimen of the present invention, it is sealed between the concrete impermeability test specimen body and the permeable test mold through a silica gel layer. Since the silica gel layer has good toughness, it can well adapt to the gap between the concrete impermeability test specimen body and the permeable test mold, has better filling property, and thus has a good sealing effect; effectively avoids the defects of existing sealing materials such as paraffin plus rosin and butter plus cement during sealing. Compared with the sealing rubber ring, the present invention well avoids the defects of the small sealing area of the sealing rubber ring and the difficulty in loading it into the permeable test mold when the tolerance of the concrete impermeability test specimen body is large.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and particularly relates to a concrete impermeability sealer, a concrete impermeability specimen and a preparation method thereof. Background Art

[0002] In traditional concrete and mortar impermeability tests, the materials for sealing the gap between the sealed specimen and the permeable test mold are generally paraffin plus rosin, butter plus cement, sealing rubber rings, etc. The main problems existing in the test process are as follows: For paraffin plus rosin sealing, it is necessary to heat and melt first, which causes environmental pollution and the test mold is not easy to clean after the test, affecting the next test, and the strength and toughness of the sealing material are very low; The strength of the butter plus cement sealing material is very low and it has almost no toughness; For the sealing rubber ring, the sealing area is small, and it is not easy to be installed in the impermeability pressure test mold when the tolerance of the specimen is large. All these three sealing materials have the problem that they can play a sealing role when the test pressure is small (below 0.8 Mpa). When the pressure continues to increase, the sealing material is easily damaged, resulting in water permeation at the sealing part, and the concrete (or mortar) water permeation pressure test cannot continue. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a concrete impermeability sealer, a concrete impermeability specimen and a preparation method thereof. The present invention can uniformly coat a flowing sealing material (such as silica gel) on the surface of the concrete impermeability specimen to form a sealing layer. This sealing layer has the characteristics of high strength and high toughness, improves the sealing effect between the concrete impermeability specimen and the permeable test mold, ensures the accuracy of the impermeability test result, and the sealing layer is also easy to clean.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A concrete impermeability specimen includes a concrete impermeability specimen body and a permeable test mold. A sealing layer is provided on the surface of the concrete impermeability specimen body for sealing with the permeable test mold, and the sealing layer is a silica gel layer.

[0006] The present invention also provides a concrete impermeability sealer for preparing the concrete impermeability specimen as described above. The concrete impermeability sealer includes a rotating disk, a scraper and a scraper mounting rack. The rotating disk is used to hold the concrete impermeability specimen body and drive the concrete impermeability specimen body to rotate coaxially. The scraper is installed on the scraper mounting rack, and the position of the scraper can be adjusted through the scraper mounting rack so that a preset distance is left between the scraper and the surface of the concrete impermeability specimen body for sealing with the permeable test mold.

[0007] Preferably, a specimen base for holding the concrete impermeability test sample body is coaxially provided on the rotating disk. The shape of the specimen base is cylindrical. After the concrete impermeability test sample body is coaxially placed on the specimen base, the diameter of the end face of the concrete impermeability test sample body in contact with the specimen base is not less than the diameter of the specimen base, and the length of the scraper is not less than the length of the side generatrix.

[0008] Preferably, the concrete impermeability sealer of the present invention further includes a rotating disk support. The rotating disk support includes a rotating bearing, a middle column, and a bearing platform base. The middle column is vertically installed on the bearing platform base, and the upper end of the middle column is coaxially installed with the rotating disk through the rotating bearing.

[0009] Preferably, the scraper mounting bracket includes a fixed rod and a scraper positioning curved plate. One end of the fixed rod is fixedly arranged, and the other end of the fixed rod is pivotally connected to the lower end of the scraper positioning curved plate. A detachable movable pin is also provided at the connecting part of the fixed rod and the scraper positioning curved plate. The movable pin penetrates through the fixed rod and the scraper positioning curved plate to fix the fixed rod and the scraper positioning curved plate at a preset angle.

[0010] The other end of the scraper positioning curved plate is connected to the scraper.

[0011] Preferably, the fixed rod includes a round rod and a U-shaped card slot. One end of the round rod is fixedly arranged through a fixing bolt. The hole on the round rod for the fixing bolt to pass through is a long hole. Through the long hole, the distance between the scraper and the surface of the concrete impermeability test sample body for sealing with the water permeable test mold can be adjusted. The round rod is fixedly connected to the U-shaped card slot. One end of the scraper positioning curved plate extends into the opening of the U-shaped card slot and is pivotally connected to the scraper positioning curved plate through a rotating shaft. The rotating shaft of the scraper positioning curved plate is perpendicular to the rotating shaft of the rotating disk. The movable pin penetrates through the side wall of the U-shaped card slot and the scraper positioning curved plate, and there is a clearance fit between the movable pin and the side wall of the U-shaped card slot and the scraper positioning curved plate.

[0012] Preferably, at least two positioning pins are provided on the side surface of the scraper at a preset distance. Positioning holes for the positioning pins to pass through are provided on the scraper positioning curved plate. The positioning holes are long holes, and the width of the positioning holes is greater than the diameter of the positioning pins. Through the positioning holes, the clearance and angle between the scraper and the surface of the concrete impermeability test sample body for sealing with the water permeable test mold can be adjusted.

[0013] The scraper and the scraper positioning curved plate are fixedly connected through a fastening bolt.

[0014] Preferably, it further includes a scraper fixing plate. The scraper is located between the scraper fixing plate and the scraper positioning curved plate. The scraper fixing plate and the scraper positioning curved plate are fixedly connected through a fastening bolt.

[0015] The present invention also provides a method for preparing a concrete impermeability specimen as described above. The concrete impermeability specimen is prepared by the concrete impermeability sealing instrument of the present invention as described above. The preparation method includes the following processes:

[0016] Coaxially place the concrete impermeability specimen body on the rotating disk;

[0017] Adjust the scraper mounting frame so that there is a preset distance between the scraper and the surface of the concrete impermeability specimen body used for sealing with the water permeable test mold. Then fix the scraper mounting frame, and fix the scraper and the scraper mounting frame. The preset distance is the thickness of the sealing layer;

[0018] Drive the concrete impermeability specimen body to rotate through the rotating disk. During the rotation of the concrete impermeability specimen body, apply the flowing sealing layer material on the surface of the concrete impermeability specimen body. The sealing layer material applied on the surface of the concrete impermeability specimen body is scraped flat by the scraper until the application of the sealing layer material on the surface of the concrete impermeability specimen body is completed;

[0019] Adjust the scraper away from the concrete impermeability specimen body through the scraper mounting frame. Then put the water permeable test mold on the outside of the concrete impermeability specimen body coated with the sealing layer. Then remove the water permeable test mold together with the concrete impermeability specimen body. After that, continue to press the concrete impermeability specimen body into the water permeable test mold to make the end face of the concrete impermeability specimen body flush with the end face of the water permeable test mold. Then let it stand still until the sealing layer material cures to form the sealing layer, and the preparation of the concrete impermeability specimen is completed.

[0020] Preferably, the coating thickness of the sealing layer material is 1 - 2 mm.

[0021] The present invention has the following beneficial effects:

[0022] In the concrete impermeability specimen of the present invention, a silica gel layer is used for sealing between the concrete impermeability specimen body and the water permeable test mold. Since the silica gel layer has good toughness, it can well adapt to the gap between the concrete impermeability specimen body and the water permeable test mold, has better filling property, and thus has a good sealing effect; effectively avoiding the defects of existing sealing materials such as paraffin plus rosin, butter plus cement during sealing. Compared with the sealing rubber ring, the silica gel layer can be prepared directly on the surface of the concrete impermeability specimen body by using flowing silica gel to form a sealing layer. The surface of the concrete impermeability specimen body fits well with the silica gel layer, and the water permeable test mold fits well with the silica gel layer. Therefore, the present invention well avoids the defects of the small sealing area of the sealing rubber ring and the difficulty in loading into the water permeable test mold when the tolerance of the concrete impermeability specimen body is large. In addition, the sealing layer is made of silica gel layer, which is also easy to remove after the experiment, facilitating the experiment. Description of the Drawings

[0023] Figure 1(a) is the front view of the concrete impermeability sealing instrument of the present invention; Figure 1(b) is the side view of the concrete impermeability sealing instrument of the present invention;

[0024] Figure 2(a) is the side view of the scraper of the present invention; Figure 2(b) is the front view of the scraper of the present invention; Figure 2(c) is the structural schematic diagram of the fixing plate of the present invention; Figure 2(d) is the structural schematic diagram of the scraper positioning curved plate of the present invention;

[0025] Figure 3(a) is the front view of the fixing rod of the present invention; Figure 3(b) is the top view of the fixing rod of the present invention; Figure 3(c) is the left view of the fixing rod of the present invention.

[0026] In the figure, 1-concrete impermeability test sample body, 2-sample base, 3-rotating disk, 4-rotating bearing, 5-middle column, 6-fixing bolt, 7-capital base, 8-lock column bolt, 9-fixing rod, 9-1-U-shaped card slot, 9-2-round rod, 9-2-1-adjusting hole, 10-rotating shaft, 11-movable pin, 12-scraper positioning curved plate, 12-1-movable pin hole, 12-2-rotating shaft hole, 12-3-first scraper fixing bolt hole, 13-positioning hole, 14-fastening bolt, 15-scraper, 15-1-positioning pin, 16-scraper fixing plate, 16-1-second scraper fixing bolt hole. Specific embodiments

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] The concrete impermeability test sample provided by the present invention includes a concrete impermeability test sample body 1 and a permeable test mold. The surface of the concrete impermeability test sample body 1 for sealing with the permeable test mold is provided with a sealing layer, and the sealing layer is a silica gel layer.

[0029] Referring to Figure 1(a) and Figure 1(b), the present invention also provides a concrete impermeability sealing instrument. The concrete impermeability sealing instrument is used to prepare the concrete impermeability test sample as described above in the present invention. The concrete impermeability sealing instrument includes a rotating disk 3, a scraper 15 and a scraper mounting frame. The rotating disk 3 is used to hold the concrete impermeability test sample body 1 and drive the concrete impermeability test sample body 1 to rotate coaxially. The scraper 15 is installed on the scraper mounting frame. Through the scraper mounting frame, the position of the scraper 15 can be adjusted so that a preset distance is left between the scraper 15 and the surface of the concrete impermeability test sample body 1 for sealing with the permeable test mold.

[0030] The process of preparing a concrete impermeability test sample using the concrete impermeability sealing instrument of the present invention includes the following steps:

[0031] S1. Place the concrete impermeability test sample body 1 coaxially on the rotating disk 3;

[0032] S2. Adjust the scraper mounting bracket so that there is a preset distance (usually 1 - 2 mm is sufficient, which allows the coating thickness of the sealing layer material to be controlled within 1 - 2 mm) between the scraper 15 and the surface of the concrete impermeability test sample body 1 used for sealing with the permeable test mold. Then fix the scraper mounting bracket, as well as fix the scraper 15 and the scraper mounting bracket. This can ensure that during the subsequent coating of silicone on the surface of the concrete impermeability test sample body 1, the relative position between the scraper 15 and the surface of the concrete impermeability test sample body 1 is fixed, guaranteeing the uniformity of the silicone layer coating;

[0033] S3. Drive the concrete impermeability test sample body 1 to rotate through the rotating disc 3. During the rotation of the concrete impermeability test sample body 1, apply the flowing sealing layer material on the surface of the concrete impermeability test sample body 1. The sealing layer material applied on the surface of the concrete impermeability test sample body 1 is leveled by the scraper 15 until the coating of the sealing layer material on the surface of the concrete impermeability test sample body 1 is completed. When preparing the flowing sealing layer material, weigh a certain amount of liquid silicone with a paper cup or a plastic cup, add the curing agent in proportion, and quickly stir evenly with a stirring rod. The evenly stirred liquid silicone is applied on the surface of the sample with a stirring rod (the distribution area is about 80% of the sample surface area from top to bottom).

[0034] S4. Adjust the scraper 15 away from the concrete impermeability test sample body 1 through the scraper mounting bracket, then put the permeable test mold over the outside of the concrete impermeability test sample body 1 coated with the sealing layer, then remove the permeable test mold together with the concrete impermeability test sample body 1, and then continue to press the concrete impermeability test sample body 1 downward into the permeable test mold so that the end face of the concrete impermeability test sample body 1 is flush with the end face of the permeable test mold. Then let it stand still until the sealing layer material cures to form the sealing layer, and the preparation of the concrete impermeability test sample is completed.

[0035] Generally, when using the permeable test mold, its inner surface should be kept clean. After covering the concrete impermeability test sample body 1 with the test mold, slightly rotate and press it down. Remove the test mold together with the concrete impermeability test sample body 1 from the sample base and invert it under the testing machine, and slightly apply pressure until the bottom surface of the concrete impermeability test sample body 1 is flush with the bottom opening of the test mold. The prepared sealed sample is placed at room temperature for 12 - 24 hours until the liquid silicone cures. The material of the permeable test mold is steel.

[0036] Referring to FIGS. 1(a) and 1(b), a sample base 2 for holding the concrete impermeability test sample body 1 is coaxially provided on the rotating disk 3. The shape of the sample base 2 is cylindrical. When the concrete impermeability test sample body 1 is coaxially placed on the sample base 2, the diameter of the end face of the concrete impermeability test sample body 1 in contact with the sample base 2 is not less than the diameter of the sample base 2. Preferably, the lower end of the concrete impermeability test sample body 1 has the same diameter as the sample base 2. In this way, when the concrete impermeability test sample body 1 is placed on the sample base 2, it is convenient to quickly align it manually, so that the concrete impermeability test sample body 1 and the sample base 2 are kept coaxial. The length of the scraper 15 is not less than the length of the side generatrix, so that the scraper 15 can scrape the entire side of the concrete impermeability test sample body 1 at one time, improving the scraping efficiency and uniformity.

[0037] Referring to FIGS. 1(a) and 1(b), the concrete impermeability sealer of the present invention further includes a rotating disk support. The rotating disk support includes a rotating bearing 4, a middle column 5 and a bearing platform base 7. The middle column 5 is vertically installed on the bearing platform base 7, and the upper end of the middle column 5 is coaxially installed with the rotating disk 3 through the rotating bearing 4. Among them, the bearing platform base 7 can be used as the support of the whole instrument, and the rotating disk 3 can rotate flexibly through the rotating bearing 4. The rotating mode of the rotating disk 3 can be manual or electric.

[0038] Referring to FIGS. 1(a) and 1(b), FIGS. 2(d), Figure 3(a) to Figure 3(c) The scraper mounting bracket of the present invention includes a fixed rod 9 and a scraper positioning curved plate 12. One end of the fixed rod 9 is fixedly arranged, and the other end of the fixed rod 9 is pivotally connected to the lower end of the scraper positioning curved plate 12. Through this pivotal connection method, the fixed rod 9 can rotate relative to the scraper positioning curved plate 12, so as to facilitate operating the scraper 15 to approach or move away from the concrete impermeability test sample body 1. A detachable movable pin 11 is also provided at the connecting part of the fixed rod 9 and the scraper positioning curved plate 12. The movable pin 11 penetrates the fixed rod 9 and the scraper positioning curved plate 12 and is used to fix the fixed rod 9 and the scraper positioning curved plate 12 at a preset angle. When the distance between the scraper 15 and the surface of the concrete impermeability test sample body 1 reaches the preset value, the fixed rod 9 and the scraper positioning curved plate 12 can be relatively fixed through the movable pin 11 and locked with each other, thereby ensuring the distance between the scraper 15 and the surface of the concrete impermeability test sample body 1. The other end of the scraper positioning curved plate 12 is connected to the scraper 15.

[0039] Referring to FIGS. 1(a) and 1(b), Figure 3(a) to Figure 3(c), the fixed rod 9 includes a round rod 9-2 and a U-shaped card slot. One end of the round rod 9-2 is fixedly arranged through a fixing bolt 6. The hole on the round rod 9-2 for the fixing bolt 6 to pass through is a long hole. Through the long hole, the scraper 15 can be adjusted to be close to or far from the surface of the concrete impermeability test sample body 1 for sealing with the permeable test mold. In this way, the coarse adjustment of the distance between the scraper 15 and the surface of the concrete impermeability test sample body 1 can be realized. The round rod 9-2 is fixedly connected with the U-shaped card slot 9-1. One end of the scraper positioning curved plate 12 extends into the opening of the U-shaped card slot 9-1 and is axially connected with the scraper positioning curved plate 12 through a rotating shaft 10. The rotating shaft of the scraper positioning curved plate 12 is perpendicular to the rotating shaft of the rotating disk 3. The movable pin 11 penetrates through the side wall of the U-shaped card slot 9-1 and the scraper positioning curved plate 12, and there is a clearance fit between the movable pin 11 and the side wall of the U-shaped card slot 9-1 and the scraper positioning curved plate 12. Through this clearance fit, the relative shaking between the fixed rod 9 and the scraper positioning curved plate 12 can be prevented.

[0040] See FIGS. 1(a) and 1(b), Figure 2(a) to Figure 2(d) , at least two (generally 2-3 are sufficient) positioning pins 15-1 are arranged on the side surface of the scraper 15 at a preset distance. Positioning holes 13 for the positioning pins 15-1 to pass through are opened on the scraper positioning curved plate 12. The positioning holes 13 are long holes. The width of the positioning holes 13 is greater than the diameter of the positioning pins 15-1. Through the positioning holes 13, the gap and angle between the scraper 15 and the surface of the concrete impermeability test sample body 1 for sealing with the permeable test mold can be adjusted. In this way, the fine adjustment of the position of the scraper 15 can be realized, and the coating progress of the sealing layer can be ensured; the scraper 15 and the scraper positioning curved plate 12 are fixedly connected through a fastening bolt 14. The hole on the scraper 15 for the fastening bolt 14 to pass through is a long hole to adapt to the adjustment of the orientation of the scraper 15.

[0041] Based on the above technical solution, the present invention can also set a scraper fixing plate 16. The scraper 15 is located between the scraper fixing plate 16 and the scraper positioning curved plate 12. The scraper fixing plate 16 and the scraper positioning curved plate 12 are fixedly connected through a fastening bolt 14. The scraper 15 can be clamped by the scraper fixing plate 16 and the scraper positioning curved plate 12. At this time, the fastening bolt 14 does not have to pass through the scraper 15, reducing the processing difficulty of the scraper 15.

[0042] As can be seen from the above solution, the present invention uses a liquid silicone material to seal the gap between the permeable test mold and the concrete (or mortar) for the permeation test. The liquid silicone has a certain viscosity and fluidity, can adhere to and penetrate into the holes on the concrete surface, and is evenly applied on the sealing surface of the concrete or mortar. The test piece is extruded and loaded into the permeable steel test mold. After the liquid silicone self-cures, the silicone completely bonds and seals the inner surface of the test mold and the test piece surface into one body. Moreover, the cured silicone has a high tensile strength and toughness, can resist large water pressure damage, and can effectively solve the sealing problem of the concrete and mortar permeation tests. The cured silicone is also very easy to peel off from the steel (metal), which is convenient for cleaning the test mold. It can be seen that the present invention realizes the quick and effective sealing of the gap between the test specimen and the permeable test mold in the concrete impermeability detection.

Claims

1. Concrete impermeability sealing instrument, characterized in that, The concrete impermeability sealing instrument is used to prepare concrete impermeability specimens. The concrete impermeability specimens include a concrete impermeability specimen body (1) and a permeable test mold. A sealing layer is provided on the surface of the concrete impermeability specimen body (1) for sealing with the permeable test mold. The sealing layer is a silica gel layer. The concrete impermeability sealing instrument includes a rotating disk (3), a scraper (15) and a scraper mounting frame. The rotating disk (3) is used to hold the concrete impermeability specimen body (1) and drive the concrete impermeability specimen body (1) to rotate coaxially. The scraper (15) is installed on the scraper mounting frame, and the position of the scraper (15) can be adjusted through the scraper mounting frame so that a preset distance is left between the scraper (15) and the surface of the concrete impermeability specimen body (1) for sealing with the permeable test mold; The scraper mounting frame includes a fixed rod (9) and a scraper positioning curved plate (12). One end of the fixed rod (9) is fixedly arranged, and the other end of the fixed rod (9) is axially connected to the lower end of the scraper positioning curved plate (12). A detachable movable pin (11) is also provided at the connecting part of the fixed rod (9) and the scraper positioning curved plate (12). The movable pin (11) penetrates through the fixed rod (9) and the scraper positioning curved plate (12) to fix the fixed rod (9) and the scraper positioning curved plate (12) at a preset angle; The other end of the scraper positioning curved plate (12) is connected to the scraper (15); A specimen base (2) for holding the concrete impermeability specimen body (1) is coaxially provided on the rotating disk (3). The shape of the specimen base (2) is cylindrical. After the concrete impermeability specimen body (1) is coaxially placed on the specimen base (2), the diameter of the end face of the concrete impermeability specimen body (1) in contact with the specimen base (2) is not less than the diameter of the specimen base (2), and the length of the scraper (15) is not less than the length of the side generatrix.

2. The concrete impermeability sealing instrument according to claim 1, characterized in that, It also includes a rotating disk support. The rotating disk support includes a rotating bearing (4), a middle column (5) and a bearing platform base (7). The middle column (5) is vertically installed on the bearing platform base (7), and the upper end of the middle column (5) is coaxially installed with the rotating disk (3) through the rotating bearing (4).

3. The concrete impermeability sealing instrument according to claim 1, characterized in that, The fixed rod (9) includes a round rod (9-2) and a U-shaped card slot. One end of the round rod (9-2) is fixedly arranged through a fixing bolt (6). The hole on the round rod (9-2) for the fixing bolt (6) to pass through is a long hole. Through the long hole, the scraper (15) can be adjusted to be closer to or farther from the surface of the concrete impermeability specimen body (1) for sealing with the permeable test mold. The round rod (9-2) is fixedly connected to the U-shaped card slot (9-1). One end of the scraper positioning curved plate (12) extends into the opening of the U-shaped card slot (9-1) and is axially connected to the scraper positioning curved plate (12) through a rotating shaft (10). The rotating shaft of the scraper positioning curved plate (12) is perpendicular to the rotating shaft of the rotating disk (3). The movable pin (11) penetrates through the side wall of the U-shaped card slot (9-1) and the scraper positioning curved plate (12), and has a clearance fit with the side wall of the U-shaped card slot (9-1) and the scraper positioning curved plate (12).

4. The concrete impermeability sealing instrument according to claim 1, characterized in that, On the side of the scraper (15), there are at least two positioning pins (15-1) spaced apart by a preset distance. Positioning holes (13) for the positioning pins (15-1) to pass through are provided on the scraper positioning curved plate (12). The positioning holes (13) are elongated holes, and the width of the positioning holes (13) is greater than the diameter of the positioning pins (15-1). Through the positioning holes (13), the gap and the angle between the scraper (15) and the surface of the concrete impermeability test sample body (1) used for sealing with the permeable test mold can be adjusted; The scraper (15) and the scraper positioning curved plate (12) are fixedly connected by a fastening bolt (14).

5. The concrete impermeability sealing instrument according to claim 1 or 4, characterized in that, It further includes a scraper fixing plate (16). The scraper (15) is located between the scraper fixing plate (16) and the scraper positioning curved plate (12). The scraper fixing plate (16) and the scraper positioning curved plate (12) are fixedly connected by a fastening bolt (14).

6. The concrete impermeability sealing instrument according to claim 1, wherein The method for preparing a concrete impermeability test sample using the concrete impermeability sealer includes the following process: Coaxially place the concrete impermeability test sample body (1) on the rotating disk (3); Adjust the scraper mounting frame so that there is a preset distance between the scraper (15) and the surface of the concrete impermeability test sample body (1) used for sealing with the permeable test mold. Then fix the scraper mounting frame and fix the scraper (15) and the scraper mounting frame. The preset distance is the thickness of the sealing layer; Drive the concrete impermeability test sample body (1) to rotate through the rotating disk (3). During the rotation of the concrete impermeability test sample body (1), apply the flowing sealing layer material on the surface of the concrete impermeability test sample body (1). The sealing layer material applied on the surface of the concrete impermeability test sample body (1) is scraped flat by the scraper (15) until the application of the sealing layer material on the surface of the concrete impermeability test sample body (1) is completed; Adjust the scraper (15) away from the concrete impermeability test sample body (1) through the scraper mounting frame. Then put the permeable test mold on the outside of the concrete impermeability test sample body (1) coated with the sealing layer. Then remove the permeable test mold together with the concrete impermeability test sample body (1). After that, continue to press the concrete impermeability test sample body (1) into the permeable test mold to make the end face of the concrete impermeability test sample body (1) flush with the end face of the permeable test mold. Then let it stand still until the sealing layer material cures to form the sealing layer, and the preparation of the concrete impermeability test sample is completed.

7. The concrete impermeability sealing instrument according to claim 6, characterized in that, The coating thickness of the sealing layer material is 1 - 2 mm.

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