Impermeability test system for roller compacted concrete bonding layer

Abstract

The utility model belongs to the technical field of concrete impermeability tests, and discloses a roller compacted concrete bonding layer impermeability test system which comprises an impermeability cover die, a test die base, a water injection hose and an impermeability instrument. The impervious cover die is detachably connected with the test die base to define a forming cavity with an opening in the upper end; a flow guide component extending axially is vertically arranged on the test mold base, and when the flow guide component is used for manufacturing a concrete test piece in the forming cavity, a water injection channel penetrating through a test piece bonding layer is formed in the concrete test piece; one end of the water injection hose is hermetically connected with the water outlet of the anti-permeability instrument, and the other end is inserted into the water injection channel to a preset depth for applying water pressure to the test piece. According to the impermeability test system, the water injection channel is arranged in the test piece, so that injected water directly seeps from the middle layer, the influence of roller compacted concrete at the lower layer on the impermeability result is avoided, in addition, the permeation condition of the bonding layer can be directly observed through the perspective arc-shaped plate, the impermeability path is analyzed, and the impermeability performance of the bonding layer is accurately judged.

Description

Technical Field

[0001] This utility model discloses a test system for the impermeability of roller-compacted concrete bonding layer, belonging to the field of concrete impermeability test technology. Background Technology

[0002] Roller-compacted concrete (RCC) is a dry-hard, lean-cement concrete. It is produced by mixing silicate cement, pozzolanic admixtures, water, additives, sand, and graded coarse aggregate to create a slump-free, dry-hard concrete. It is transported and laid using the same equipment as earth-rock dam construction, and compacted in layers with a vibratory roller. Its material properties and construction process determine the layered structure of RCC, and the bonding performance between layers is often the weakest point. The bonding layer, as the connecting link between the concrete layers, directly affects the waterproofing effect and long-term stability of the entire structure. Once water seeps into the bonding layer and forms seepage channels inside the dam, it severely affects the strength and durability of the concrete, leading to more serious safety problems.

[0003] Current testing methods for the interlayer bonding impermeability of concrete have significant shortcomings. First, test results are often overestimated because specimen design or testing methods limit the timely detection of interlayer seepage, and the strong impermeability of the underlying concrete layer interferes with the accurate assessment of the true performance of the bonding layer. Second, the molding quality of roller-compacted concrete has a significant impact on its impermeability, but existing testing methods cannot accurately analyze seepage paths or assess the specific impact of molding quality on the impermeability of the bonding layer, leading to unreliable test results. Furthermore, the specifications of specimens and molds for permeability testing instruments on the market are inconsistent, lacking a unified standard, and the mismatch between specimens and molds further affects the accuracy of test results. Finally, existing testing methods lack intuitive and accurate judgment tools; testers can only rely on observing the presence or absence of seepage on the upper surface of the specimen to determine the test results, which is not only highly subjective but also fails to accurately quantify the impermeability of the bonding layer. Summary of the Invention

[0004] This utility model overcomes the shortcomings of the prior art and proposes a test system for the impermeability of roller-compacted concrete bonding layer, including: an impermeability mold, a mold base, a water injection hose, and an impermeability meter;

[0005] The anti-permeability sleeve and the test mold base are detachably connected to form a molding cavity with an open top.

[0006] The mold base is vertically provided with an axially extending guide member. When the concrete specimen is made in the molding cavity, the guide member forms a water injection channel that penetrates the bonding layer of the specimen.

[0007] One end of the water injection hose is sealed to the outlet of the anti-permeability instrument, and the other end is inserted into the water injection channel to a preset depth to apply water pressure to the specimen.

[0008] Preferably, the sidewall of the anti-seepage mold is provided with a transparent arc-shaped plate;

[0009] The transparent curved plate corresponds to the bonding layer of the concrete specimen.

[0010] Preferably, the concrete specimen comprises, from top to bottom, an upper layer of concrete, a bonding layer, and a lower layer of concrete.

[0011] Preferably, the top end of the flow guiding member penetrates through the lower concrete layer and the bonding layer;

[0012] It is then inserted into the upper layer of concrete to the first preset depth.

[0013] Preferably, the other end of the water injection hose is inserted into the lower layer of concrete at a second preset depth from the bonding layer.

[0014] Preferably, the transparent arc plate has a greater transparent range than the thickness of the bonding layer.

[0015] Preferably, the transparent curved plate is made of plexiglass or transparent resin material.

[0016] Preferably, the dimensions of the anti-permeability mold are matched with the anti-permeability instrument.

[0017] Preferably, the surface of the mold base is provided with a groove or a flexible sealing gasket.

[0018] Preferably, the anti-permeability mold and the test mold base are made of steel.

[0019] Compared with existing technologies, the beneficial effects of this invention are as follows: The permeability testing system of this invention, by setting water injection channels within the specimen, allows water to seep directly from the intermediate layer, avoiding the influence of the lower layer of roller-compacted concrete on the permeability results. Furthermore, this application allows direct observation of the permeability of the bonding layer through a transparent curved plate to analyze the permeability path and accurately determine the permeability performance of the bonding layer. This system has a high degree of compatibility with most existing concrete permeability testers on the market, reducing user costs and improving equipment utilization. The permeability testing system of this invention is simple and convenient to operate, greatly shortening the testing cycle. Attached Figure Description

[0020] Figure 1 This is a schematic longitudinal section of the anti-permeability specimen in an embodiment of this utility model;

[0021] Figure 2 This is a top view of the anti-permeability test mold in an embodiment of this utility model;

[0022] Figure 3 This is a schematic front view of the anti-permeability test mold in an embodiment of this utility model;

[0023] Figure 4 This is a top view of the transparent curved plate in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the longitudinal section of the roller-compacted concrete specimen in an embodiment of this utility model;

[0025] Figure 6 This is a bottom view of a roller-compacted concrete specimen in an embodiment of this utility model.

[0026] In the figure: 1. Roller-compacted concrete specimen; 101. Upper layer of roller-compacted concrete; 102. Lower layer of roller-compacted concrete; 103. Bonding layer; 2. Impermeability test mold; 201. Impermeability sleeve mold; 202. Transparent curved plate; 203. Bolt; 204. Embedded long nail; 205. Test mold base; 3. Water injection hose; 4. Permeability meter. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] This invention provides a test system for the impermeability of roller-compacted concrete bonding layers. The system mainly includes key components such as an impermeability mold 201, a mold base 205, a water injection hose 3, and an impermeability meter 4. The specific embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0029] Please see Figure 1-6 As shown, the roller-compacted concrete bonding layer impermeability test system includes an impermeability mold 201, a mold base 205, a water injection hose 3, and an impermeability meter 4. The impermeability mold 201 and the mold base 205 are detachably connected to form a molding cavity with an open upper end. The mold base 205 is vertically provided with an axially extending flow guiding member. When making concrete specimens in the molding cavity, the flow guiding member forms a water injection channel that penetrates the bonding layer 103 of the specimen within the concrete specimen. One end of the water injection hose 3 is sealed to the outlet of the impermeability meter 4, and the other end is inserted into the water injection channel to a preset depth to apply water pressure to the specimen.

[0030] Specifically, such as Figure 2 and Figure 3As shown, in this embodiment, the anti-permeability mold 2 consists of the anti-permeability mold 201, bolts 203, flow guiding components, and mold base 205. The anti-permeability mold 201 and the mold base 205 are detachably connected by bolts 203, together forming a molding cavity with an open top. This molding cavity is cylindrical, with specific dimensions of an inner diameter of φ150mm and a height of 150mm. This molding cavity is used to prepare concrete specimens. Specifically, the concrete specimen in this application is a roller-compacted concrete specimen 1 prepared from roller-compacted concrete. The roller-compacted concrete specimen 1 specifically includes, from top to bottom, an upper layer of roller-compacted concrete 101, a bonding layer 103, and a lower layer of roller-compacted concrete 102.

[0031] In this embodiment, the guiding component is specifically a pre-embedded long nail 204. This pre-embedded long nail 204 serves to form a water injection channel during the concrete specimen molding process. One end of the pre-embedded long nail 204 is located in the middle of the mold base 205 and extends perpendicularly to the mold base 205 along its axis. The size and position of the pre-embedded long nail 204 need to be determined according to the specific size and design requirements of the specimen to ensure that it can penetrate the lower layer of roller-compacted concrete 102 and the bonding layer 103, and insert into the upper layer of roller-compacted concrete 101 to a predetermined depth. In this embodiment, the pre-embedded long nail 204 has a size of φ10mm and a height of 90mm, enabling it to penetrate the bonding layer 103 of the specimen and form an effective water injection channel.

[0032] The specific process for preparing roller-compacted concrete specimen 1 includes: mixing roller-compacted concrete, assembling the impermeability mold 2, filling the impermeability mold 2 with a lower layer of roller-compacted concrete 102, and compacting it with vibration until its thickness is 70 mm; then filling with a bonding layer 103, with a thickness of 10 mm; finally filling with an upper layer of roller-compacted concrete 101, and compacting it with vibration until it is flush with the upper surface of the molded cavity. It should be noted that during the preparation of roller-compacted concrete specimen 1, the pre-embedded long nails 204 in the impermeability mold 2 will penetrate the lower layer of roller-compacted concrete 102 and the bonding layer 103, and insert into the upper layer of roller-compacted concrete 101 to a depth of 10 mm. The specimen, if... Figures 5-6 As shown.

[0033] After the roller-compacted concrete specimen 1 is formed, the mold is removed according to regulations. During the demolding, the pre-embedded long nails 204 are removed from the specimen along with the mold base 205. After demolding, the specimen is placed in the curing room for curing. After the curing period, it is placed on the permeability tester 4 for testing.

[0034] In this embodiment of the present invention, the side wall of the anti-seepage mold 201 is provided with a transparent arc plate 202; the width of the transparent arc plate 202 corresponds to the thickness of the bonding layer 103 of the concrete specimen.

[0035] Specifically, in this embodiment, a horizontal elongated hole is pre-reserved on the side wall of the anti-permeability mold 201. The position of this hole corresponds to the bonding layer 103 of the roller-compacted concrete specimen 1, so as to observe the anti-permeability of the bonding layer 103 during the test. To prevent the roller-compacted concrete from leaking out of the anti-permeability mold 2 during specimen preparation, a transparent observation arc plate is set at the horizontal elongated hole. For easy observation, the viewing range of the transparent arc plate 202 is greater than the thickness of the bonding layer 103. In this embodiment, the height of the horizontal elongated hole is 20mm, and the corresponding viewing range of the transparent arc plate 202 is 20mm. In this embodiment, a top view of the transparent arc plate is shown below. Figure 4 As shown. This invention preferably uses plexiglass or transparent resin as the material for the transparent curved plate 202 to ensure good transparency.

[0036] The transparent curved plate 202 of this invention not only facilitates observation of the thickness of the bonding layer 103 during the preparation of the roller-compacted concrete specimen 1, but also allows it to be connected to the permeability tester 4 during the test using the impermeable mold 201 on which it is located, so as to observe whether water seeps out of the bonding layer 103 at the transparent curved plate during the test. It should be noted that in other embodiments, the permeability test can also be carried out directly using the specimen for observation in its bare state.

[0037] Specifically, in this embodiment, after the roller-compacted concrete specimen 1 has been cured to the designated age, it is placed in the impermeability mold 201 and tested on the impermeability tester 4. Specifically, during installation, one end of the water injection hose 3 is sealed to the outlet of the impermeability tester 4, and the other end is inserted into the water injection channel formed by the pre-embedded long nail 204 to a preset depth. In this embodiment, the other end of the water injection hose 3 is inserted into the water injection channel to 60 mm, that is, the other end of the water injection hose 3 is inserted into the lower layer of roller-compacted concrete 102, and is at a second preset depth (10 mm) from the bonding layer 103, to ensure that the water pressure can be evenly applied to the bonding layer 103 of the specimen.

[0038] It should be noted that in other embodiments, the pre-embedded long nail 204 can penetrate to the upper surface of the bonding layer 103, and the water injection hose 3 can be inserted to the lower surface of the bonding layer 103, so that when the permeability tester 4 injects water into the roller-compacted concrete specimen 1 through the water injection hose 3, the water pressure only acts on the bonding layer 103. However, since the bonding layer 103 is usually not a completely flat surface, but has a certain surface roughness, in this embodiment, the range of water pressure is extended to the bonding layer 103 and the area 10 mm above and below it.

[0039] During the test, water pressure is applied to the inside of the specimen through the water injection hose of the permeability tester 4, and it is observed whether water seeps out of the bonding layer 103 at the transparent observation arc plate. When a certain water pressure is reached, if water is observed to seep out from the bonding layer 103, the test can be stopped and the relevant data recorded.

[0040] The dimensions of the anti-permeability mold 201 in this embodiment match those of a conventional anti-permeability meter 4 available on the market. Of course, in some embodiments, the anti-permeability mold 201 can be prepared to match the dimensions of a specific anti-permeability meter 4.

[0041] In this embodiment of the invention, the surface of the mold base 205 is provided with grooves or flexible sealing gaskets to ensure the tight connection of the entire anti-permeability mold 2.

[0042] In this embodiment of the utility model, the anti-permeability mold 201 and the test mold base 205 are made of steel.

[0043] This utility model's impermeability testing system incorporates a water injection channel within the specimen, allowing water to seep directly from the intermediate layer, thus avoiding the influence of the underlying roller-compacted concrete 102 on the impermeability results. Furthermore, the permeability of the bonding layer 103 can be directly observed through a transparent curved plate 202 to analyze the impermeability path and accurately determine the impermeability performance of the bonding layer 103. This system is highly compatible with most existing concrete impermeability testers on the market, reducing user costs and improving equipment utilization. The impermeability testing system of this utility model is simple and convenient to operate, significantly shortening the testing cycle.

[0044] This invention provides a permeability testing system for roller-compacted concrete (RCC) bonding layers, solving the problem of the inability to test the permeability resistance of RCC bonding layers. It is highly compatible with most permeability testing instruments on the market. Furthermore, the system is simple to operate, provides intuitive and accurate observation, and can accurately determine the permeability performance of the bonding layer, offering strong technical support for the quality control of RCC projects.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A roller compacted concrete joint sealant impermeability test system, characterized by, include: Anti-seepage mold, test mold base, water injection hose and anti-seepage instrument; The anti-permeability sleeve and the test mold base are detachably connected to form a molding cavity with an open top. The mold base is vertically provided with an axially extending guide member. When the concrete specimen is made in the molding cavity, the guide member forms a water injection channel that penetrates the bonding layer of the specimen. One end of the water injection hose is sealed to the outlet of the anti-permeability instrument, and the other end is inserted into the water injection channel to a preset depth to apply water pressure to the specimen.

2. The roller compacted concrete bond course impermeability test system of claim 1, wherein, The sidewall of the anti-seepage mold is provided with a transparent arc-shaped plate; The transparent curved plate corresponds to the bonding layer of the concrete specimen.

3. The roller-compacted concrete bonding layer impermeability test system according to claim 1, characterized in that, The concrete specimens consist of an upper layer of concrete, a bonding layer, and a lower layer of concrete, from top to bottom.

4. The roller compacted concrete bond course impermeability test system of claim 3, wherein, The top of the flow guiding member penetrates through the lower concrete layer and the bonding layer; It is then inserted into the upper layer of concrete to the first preset depth.

5. The roller compacted concrete bond course impermeability test system according to claim 3, wherein, The other end of the water injection hose is inserted into the lower layer of concrete at a second preset depth from the bonding layer.

6. The roller compacted concrete bond course impermeability test system according to claim 2, wherein, The transparent arc-shaped plate has a greater transparent range than the thickness of the bonding layer.

7. The roller compacted concrete bond course impermeability test system according to claim 6, wherein, The transparent curved panel is made of plexiglass or transparent resin material.

8. The roller compacted concrete bond course impermeability test system of claim 1, wherein, The dimensions of the anti-permeability mold are matched with those of the anti-permeability instrument.

9. The roller compacted concrete bond course impermeability test system according to claim 1, wherein, The surface of the test mold base is provided with grooves or flexible sealing gaskets.

10. The roller compacted concrete bond course impermeability test system of claim 1, wherein, The anti-permeability mold and the test mold base are made of steel.

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