Controllable concrete crack self-healing performance evaluation device

Abstract

The utility model discloses a controllable concrete crack self-healing performance evaluation device which comprises a concrete test block, the concrete test block is divided into two halves through a blocking structure in the forming stage, limiting pieces are arranged on the two sides between the two halves of the concrete test block, the outer portions of the two halves of the concrete test block are fixed through hose clamps, and a sleeve is arranged at the top of the concrete test block in a sleeved mode. The upper portion of the sleeve is communicated with a water storage structure, a valve is arranged on the lower portion in the water storage structure, a baffle is arranged below the valve, a through hole is formed in the baffle, and the hole diameter of the through hole is consistent with an opening of the valve. According to the method for prefabricating the concrete cracks, variables introduced due to different widths, forms and numbers of the cracks and different binding strengths are remarkably reduced, so that a test result is more accurate and persuasive; the device is convenient for researchers to manufacture by themselves, and required materials are easy to purchase. The device controls water flow through the ball valve, and ensures that water is discharged at the same time, pressure, mass and flow rate in each test, thereby reducing test variables.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering, in particular to a controllable concrete crack self-healing performance evaluation device. Background Art

[0002] In actual engineering, concrete often serves with cracks. To simulate this situation and study the self-healing properties of concrete, laboratories typically prefabricate cracks, then perform curing, and then evaluate their self-healing capabilities. However, when evaluating the self-healing properties of concrete, there is currently no unified standard for key technologies such as the manufacturing method and effect evaluation indicators of prefabricated cracks. Currently, the preparation methods of prefabricated cracks mainly include compression prefabricated cracks and flexural prefabricated cracks.

[0003] While these methods have been widely used in laboratory environments, they suffer from significant deficiencies in the stability and controllability of crack generation, often leading to inconsistent crack morphology and difficulty in controlling crack width, which significantly impacts the accuracy and repeatability of test data. For example, the compressive prefabrication crack method typically employs a splitting method for crack prefabrication. Due to varying preloads and loading rates, cracks of varying widths are generated, often forming dispersed cracks, often accompanied by the appearance of multiple cracks. The flexural prefabrication crack method, on the other hand, generally employs a three-point bending method. This method produces prefabricated cracks with a concentrated shape, wide at the bottom and relatively narrow at the top. However, in practice, these methods have been found to have the following drawbacks: 1. The crack width and morphology produced by the splitting method cannot be manually controlled; 2. The crack width and morphology produced by the three-point bending method vary significantly, increasing the experimental variables. Overall, both the compressive and flexural prefabrication crack methods suffer from numerous uncontrollable factors, significantly increasing the variables, which in turn significantly impact the test results and the accuracy of the test data.

[0004] There are many methods for evaluating the self-healing properties of concrete, among which water permeability testing is an economical, convenient, and effective way to investigate the extent of self-healing. However, current water permeability testing equipment is often complex, making it difficult for other researchers to replicate. Furthermore, simpler water permeability testing equipment often fails to account for the influence of water pressure, further increasing experimental variables and reducing test accuracy.

[0005] Therefore, there is an urgent need for a controllable concrete crack self-healing performance evaluation device that can solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a controllable concrete crack self-healing performance evaluation device to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above purpose, the present invention provides the following solutions:

[0008] The utility model provides a controllable concrete crack self -healing performance evaluation device, including concrete test block, the concrete test block is divided into two halves through the blocking structure in the forming stage, both sides between two halves concrete test block are equipped with the limit sheet, the outside of two halves concrete test block is fixed through the throat clamp, the top of concrete test block is equipped with the sleeve, the top of sleeve is connected with the water storage structure, the lower part in water storage structure is equipped with the valve, the lower part of valve is equipped with the baffle, is equipped with the through -hole on the baffle, the aperture of through -hole is consistent with the opening of valve.

[0009] Preferably, the limit sheet is made of iron sheet.

[0010] Preferably, the throat clamp is made of stainless steel throat clamp.

[0011] Preferably, the sleeve is made of silica gel sleeve.

[0012] Preferably, the water storage structure is made of measuring cylinder.

[0013] Preferably, the valve is made of ball valve.

[0014] Preferably, a connecting plate is arranged at the connection between the water storage structure and the sleeve.

[0015] The utility model has achieved the following beneficial technical effects compared with the prior art:

[0016] The utility model effectively solves the main problem of the existing compression and bending prefabricated crack method, i.e. the crack width, shape and number are difficult to control artificially, thereby greatly affecting the accuracy and repeatability of test data. The present application places an iron sheet between the two test blocks to prefabricate cracks, and uses a stainless steel throat clamp to fix it, ensuring that the crack width is consistent and the shape is a straight line, so that the shape, width and number of prefabricated concrete cracks are controllable. In addition, we use an acrylic plate to block before the mortar is molded, and the test block can be demolded directly after molding without the need for a release agent, which can ensure that the test block is tightly fitted during the prefabricated crack stage. In addition, test blocks formed by different molds can also be combined at will. When using a stainless steel throat clamp, the surface is usually uniformly distributed with holes, and the number of holes leaking when tightened is consistent, which can ensure that the binding force of each test block is the same, thereby ensuring that the crack width of each test block remains consistent. The prefabricated concrete crack method of the present application significantly reduces the variables introduced by different crack widths, shapes and numbers, as well as different binding forces, making the test results more accurate and more convincing.

[0017] The utility model is convenient for researchers to make themselves, and the required materials are easy to purchase. The device controls the water flow through the ball valve, ensuring that the water is discharged at the same time, pressure, mass and flow rate in each test, thereby reducing the test variables. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 A controllable concrete crack self-healing performance evaluation device structure diagram is provided. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] The purpose of the present application is to provide a controllable concrete crack self-healing performance evaluation device to solve the problems in the prior art.

[0022] In order to make the above purposes, features and advantages of the present application more apparent, specific embodiments and drawings will be described in detail.

[0023] Embodiment 1:

[0024] The present embodiment provides a controllable concrete crack self-healing performance evaluation device, as shown in Figure 1 shown, including a concrete test block, the concrete test block is divided into two halves by a blocking structure in the forming stage, the two halves of the concrete test block are provided with a limiting sheet on both sides, the outside of the two halves of the concrete test block is fixed by a throat clamp, the top of the concrete test block is provided with a sleeve 1, the upper part of the sleeve 1 is communicated with a water storage structure 2, a valve 3 is arranged in the lower part of the water storage structure 2, a baffle is arranged below the valve 3, a through hole is formed in the baffle, the aperture of the through hole is consistent with the opening of the valve 3.

[0025] As an embodiment, the limiting sheet is made of iron sheet.

[0026] As an embodiment, the throat clamp is made of stainless steel throat clamp.

[0027] As an embodiment, the sleeve 1 is made of silica gel sleeve.

[0028] As an implementation, the water storage structure 2 adopts a measuring cylinder.

[0029] As an implementation, the valve 3 adopts a ball valve.

[0030] As an implementation, the water storage structure 2 is provided with a connecting plate 4 at the connection with the sleeve 1.

[0031] The controllable concrete crack self-healing performance evaluation method using the above device comprises the following steps:

[0032] S1. Concrete test block molding; specifically:

[0033] S11. A certain thickness of acrylic plate is vertically inserted in the middle of the mold to prevent insufficient hardness from affecting use, and attention should be paid to the size of the acrylic plate, which should be accurate so that the acrylic plate is just clamped in the mold to avoid slurry leakage and ensure the consistency of concrete molding. This step aims to divide the concrete into two halves in the same mold for use when preforming cracks;

[0034] S12. Pouring concrete in the mold;

[0035] S13. Demolding after curing;

[0036] S2. Iron sheets are placed at both ends of the two test blocks, and then a stainless steel throat clamp is used to tighten them, so that they are tightly combined into a complete test block. The width of the preformed crack can be controlled by adjusting the thickness of the iron sheet. The surface of the commercially available stainless steel throat clamp usually has uniformly distributed holes, so when tightening the throat clamp, the number of holes leaking out should be ensured to be consistent to ensure that the binding force of each test block is the same, thereby ensuring that the crack width of each test block remains consistent;

[0037] S3. The concrete test block is loaded into the sleeve for water permeation test; a 3x0 grade mold-proof sealant is used to seal all gaps except the concrete preformed crack to prevent water from flowing out of other gaps;

[0038] It should be noted that: 1. Ensure that the measuring cylinder has sufficient volume to contain the test water;

[0039] S4. Obtain test data.

[0040] The specific examples applied in the utility model have described the principles and implementation modes of the utility model, and the above examples are only used to help understand the method and core idea of the utility model; at the same time, for general technical personnel in the field, according to the idea of the utility model, there will be changes in specific implementation modes and application range. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A device for evaluating the self-healing performance of controllable concrete cracks, characterized by: It includes a concrete test block, which is divided into two halves by a blocking structure during the molding stage. Limiting plates are provided on both sides between the two halves of the concrete test block. The exteriors of the two halves of the concrete test block are fixed by hose clamps. A sleeve is provided on the top of the concrete test block. The upper part of the sleeve is connected to a water storage structure. A valve is provided at the lower part of the water storage structure. A baffle is provided below the valve. A through hole is opened on the baffle, and the aperture of the through hole is consistent with the opening of the valve.

2. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: The limiting piece is made of iron sheet.

3. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: The throat hoop is made of stainless steel.

4. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: The sleeve is a silicone sleeve.

5. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: The water storage structure adopts a measuring cylinder.

6. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: The valve is a ball valve.

7. The controllable concrete crack self-healing performance evaluation device according to claim 1, characterized in that: A connecting plate is provided at the connection between the water storage structure and the sleeve.

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