Manufacturing device of test piece crack for self-repairing performance detection

Abstract

The utility model relates to the field of cement-based material testing, and particularly discloses a manufacturing device of a test piece crack for self-repairing performance detection, the manufacturing device comprises a mold which is defined by a plurality of side plates and is closed at the bottom, the two side plates are oppositely arranged, linear grooves are formed in the two oppositely arranged side plates, and the two linear grooves are oppositely arranged; a cutting line is arranged in the mold in a penetrating mode, the two ends of the cutting line are arranged in the corresponding linear grooves in a sliding mode respectively, and the length of the cutting line is larger than the distance between the two opposite side plates. The outer side of the side plate is detachably connected with a leakage blocking plate used for blocking the linear groove. The method can be suitable for making cracks in different forms, the crack forms are clear, the width and length of the cracks can be controlled, and the accuracy of a test result can be improved when the repairing capacity of the self-repairing material is represented.

Description

Technical Field

[0001] This application relates to the field of testing of cement-based materials, and particularly to a device for making cracks in specimens for self-healing performance detection. Background Art

[0002] During long-term use, the impermeability of cement-based materials such as concrete decreases sharply after cracking, which seriously affects the durability of the structure. Controlling and repairing cracks in cement-based materials, especially endowing cement-based materials with crack self-healing performance by incorporating crack self-healing materials, is a research hotspot.

[0003] In experimental studies related to crack control and self-healing performance of cement-based materials, in order to evaluate the harm of cracks and their self-healing ability, the pressure splitting method is mostly used to prefabricate cracks. Since cement-based materials are brittle and non-homogeneous, even by increasing the test quantity to select test specimens with surface crack morphologies meeting the requirements, the number and morphology of internal cracks are not clear, which affects the accuracy of test results. Utility Model Content

[0004] In order to obtain cracks with clear morphologies, this application provides a device for making cracks in specimens for self-healing performance detection.

[0005] The device for making cracks in specimens for self-healing performance detection provided by this application adopts the following technical solutions:

[0006] A device for making cracks in specimens for self-healing performance detection, comprising:

[0007] A mold, surrounded by multiple side plates and closed at the bottom, wherein two of the side plates are arranged oppositely, and linear grooves are formed on both of the two oppositely arranged side plates, and the two linear grooves are arranged oppositely;

[0008] A cutting line, penetrating through the mold, with both ends of the cutting line slidably arranged in the corresponding linear grooves, and the length of the cutting line being greater than the distance between the two opposite side plates;

[0009] A leak-proof plate, detachably connected to the outside of the side plate for sealing the linear groove.

[0010] Before pouring, pass both ends of the cutting line through the corresponding linear grooves respectively, and tighten the cutting line by an external force. Then, fix the leakage prevention plate on the outside of the side plate to prevent the cement-based material from leaking out through the linear grooves during pouring. Subsequently, pour the cement-based material into the mold, vibrate it until it is dense, and then let it stand. When the cement-based material is in the state between initial setting and final setting, remove the leakage prevention plate, hold both ends of the cutting line, keep the cutting line tightened, and move the cutting line along the linear groove. The cutting line passing through the mold cuts out a penetrating crack in the cement-based material before final setting. Continue to let it stand until the specimen is demolded, and after curing to the specified age, conduct relevant tests on the specimen.

[0011] By changing the shape of the linear groove, cracks of different shapes can be made; by changing the moving distance of the cutting line, cracks of different lengths can be made; by changing the diameter of the cutting line, cracks of different widths can be made. Thus, the operation of this application is convenient, it can be applied to the production of cracks of different shapes, and the width and length of the cracks can be controlled. When characterizing the repair ability of the self-healing material, it is beneficial to improve the accuracy of the test results.

[0012] Furthermore, a fixing column for winding the cutting line is fixedly connected to the side of the leakage prevention plate facing away from the side plate.

[0013] Tighten the cutting line and then fix the leakage prevention plate on the side plate. Subsequently, wind both ends of the cutting line around the corresponding fixing columns respectively, so as to keep the cutting line in a tightened state during pouring.

[0014] Furthermore, the fixing column is frustum-shaped, and the diameter of its end close to the leakage prevention plate is smaller than the diameter of its end far from the leakage prevention plate.

[0015] The frustum-shaped fixing column is beneficial to improving the winding stability of the cutting line, making the wound cutting line not easy to fall off from the fixing column.

[0016] Furthermore, through holes are formed in the leakage prevention plate, and bolts are inserted through the through holes, and the bolts are threadedly connected to the side plate.

[0017] Fix the leakage prevention plate on the side plate through bolts, realizing the convenient disassembly and assembly of the leakage prevention plate.

[0018] Furthermore, a plurality of through holes are provided.

[0019] A plurality of bolts fix the leakage prevention plate on the side plate, which is beneficial to improving the fixing stability of the leakage prevention plate and the tightness of the fit between the leakage prevention plate and the side plate, reducing the risk of the cement-based material in the mold leaking out.

[0020] Furthermore, the shape of the linear groove is a curve.

[0021] Furthermore, the shape of the linear groove is a straight line.

[0022] Further, the shape of the linear groove is a broken line.

[0023] The linear groove can adopt various shapes, so that the present application is applicable to the production of cracks with different shapes such as curves, straight lines, and broken lines.

[0024] Further, the cutting line is a nylon line.

[0025] The nylon line has high strength, wide sources, and low price.

[0026] In summary, the present application includes the following beneficial technical effects:

[0027] The present application is easy to operate, can be applicable to the production of cracks with different shapes, the crack shape is clear, and the width and length of the cracks can be controlled. When characterizing the repair ability of the self-healing material, it is beneficial to improve the accuracy of the test results. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Reference signs: 1, mold; 11, side plate; 12, linear groove; 2, cutting line; 3, leak-proof plate; 31, fixed column; 4, bolt. Detailed Description of the Embodiment

[0030] The following will further describe the present application in detail Figure 1 in conjunction with the attached drawings.

[0031] The embodiment of the present application discloses a device for making cracks in a specimen for self-healing performance detection. Referring to Figure 1 , the device for making cracks in a specimen for self-healing performance detection includes a mold 1 enclosed by four square side plates 11 with a closed bottom. The four side plates 11 are arranged in pairs opposite to each other. Linear grooves 12 are respectively formed through two of the relatively arranged side plates 11, and the two linear grooves 12 are arranged opposite to each other. The shape of the linear groove 12 can be a curve, a straight line, a broken line or other shapes. In this embodiment, the size of the side plate 11 is 150×150 mm, the plate thickness is 10 mm, the shape of the linear groove 12 is a curve, and the width of the linear groove 12 is not greater than 2 mm.

[0032] Referring to Figure 1 , a cutting line 2 is arranged through the mold 1. The two ends of the cutting line 2 are respectively slidably arranged in the corresponding linear grooves 12, and the length of the cutting line 2 is greater than the distance between two opposite side plates 11. The cutting line 2 can be a nylon line, a diamond wire, etc., and the diameter of the cutting line 2 is not greater than the width of the linear groove 12; in this embodiment, the cutting line 2 is a 0.4 nylon line, and the length of the nylon line is 500 mm.

[0033] Referring toFigure 1 On the outer side of the side plate 11, a leak-proof plate 3 is detachably connected. The leak-proof plate 3 closely adheres to the side plate 11 and covers the linear groove 12, thereby blocking the linear groove 12, which helps to prevent the cement-based material from leaking out through the linear groove 12 during the pouring process.

[0034] Before pouring, the two ends of the cutting line 2 are respectively passed through the corresponding linear grooves 12. The cutting line 2 is placed at one end of the linear groove 12 and the cutting line 2 is tightened by an external force, and then the leak-proof plate 3 is fixed on the outer side of the side plate 11. The prepared self-healing cement-based material is poured into the mold 1, vibrated densely and then left standing. When the cement-based material is in the state between initial setting and final setting, the leak-proof plate 3 is removed, and the two ends of the cutting line 2 are held, keeping the cutting line 2 tightened. At this time, the cement-based material still has a certain plasticity. The cutting line 2 is moved along the linear groove 12, and the cutting line 2 passing through the mold 1 cuts out a penetrating crack in the cement-based material before final setting. Continue to leave it standing until the specimen is demolded, and after curing to the specified age, relevant tests are carried out on the specimen.

[0035] By using the mold 1 with linear grooves 12 of different shapes, cracks of different shapes can be made; by changing the moving distance of the cutting line 2, cracks of different lengths can be made; by using cutting lines 2 of different diameters, cracks of different widths can be made. Thus, the operation of this application is convenient, and it can be applied to the production of cracks of different shapes. The crack shape is clear and the width and length of the crack can be controlled, which is beneficial to improving the accuracy of the test results when characterizing the repair ability of the self-healing material.

[0036] In order to fix the leak-proof plate 3 on the side plate 11, referring to Figure 1 The leak-proof plate 3 is rectangular with a plate thickness of 5 mm. Through holes are provided at the four corners of the leak-proof plate 3, and bolts 4 are passed through the through holes. Threaded holes corresponding to the positions of the through holes are provided on the side plate 11, and the depth of the threaded holes is 5 mm. The bolts 4 are threadedly connected to the side plate 11.

[0037] The leak-proof plate 3 is fixed on the side plate 11 through the bolts 4, realizing the convenient disassembly and assembly of the leak-proof plate 3; multiple bolts 4 are beneficial to improving the fixing stability of the leak-proof plate 3 and the tightness of the fit between the leak-proof plate 3 and the side plate 11, reducing the risk of the cement-based material leaking out of the mold 1.

[0038] Referring to Figure 1 On the center of the side of the leak-proof plate 3 facing away from the side plate 11, a fixing column 31 for winding the cutting line 2 is fixedly connected. The fixing column 31 is frustum-shaped, with a diameter of 2 mm at the end close to the leak-proof plate 3 and a diameter of 2.5 mm at the end far from the leak-proof plate 3.

[0039] Before pouring, tighten the cutting line 2 and then fix the leak-proof plate 3 on the side plate 11. Subsequently, wind the two ends of the cutting line 2 around the corresponding fixing columns 31 respectively, so that the cutting line 2 remains in a tightened state during the pouring process. The frustum-shaped fixing columns 31 are beneficial to improving the winding stability of the cutting line 2, making the wound cutting line 2 not easy to fall off from the fixing columns 31.

[0040] The implementation principle of the device for making cracks in specimens for self-healing performance detection in the embodiment of the present application is as follows: Before pouring, pass the two ends of the cutting line 2 through the corresponding linear grooves 12 respectively, place the cutting line 2 at one end of the linear groove 12 and tighten the cutting line 2 by an external force. Then fix the leak-proof plate 3 on the outside of the side plate 11 to prevent the cement-based material from leaking out through the linear groove 12 during pouring; pour the prepared self-healing cement-based material into the mold 1, vibrate it densely and then let it stand; when the cement-based material is in the state between initial setting and final setting, remove the leak-proof plate 3, hold the two ends of the cutting line 2, keep the cutting line 2 tightened, and move the cutting line 2 along the linear groove 12. The cutting line 2 passing through the mold 1 cuts out a penetrating crack in the cement-based material before final setting, and continue to let it stand until the specimen is demolded. After curing to the specified age, relevant tests are carried out on the specimen.

[0041] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A device for making cracks in a specimen for self-repairing performance testing, characterized in that: include: The mold is formed by a plurality of side panels and has a closed bottom, wherein two of the side panels are arranged opposite to each other, and linear grooves are provided on the two side panels, and the two linear grooves are arranged opposite to each other; A cutting line is arranged in the mold, and two ends of the cutting line are respectively slidably arranged in the corresponding linear grooves, and the length of the cutting line is greater than the distance between the two opposite side plates; The leakage-blocking plate is detachably connected to the outer side of the side plate and is used for blocking the linear groove.

2. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: A fixing column for the cutting line to be wound around is fixedly connected to one side of the leakage blocking plate away from the side plate.

3. The device for making cracks in a test piece for self-repairing performance testing according to claim 2, characterized in that: The fixing column is in a truncated cone shape, and the diameter of the end close to the leakage shielding plate is smaller than the diameter of the end away from the leakage shielding plate.

4. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: The leakage-blocking plate is provided with a through hole, a bolt is passed through the through hole, and the bolt is threadedly connected to the side plate.

5. The device for making cracks in a test piece for self-repairing performance testing according to claim 4, characterized in that: A plurality of through holes are provided.

6. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: The linear groove is in the form of a curve.

7. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: The linear groove is in the form of a straight line.

8. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: The linear groove is in the form of a broken line.

9. The device for making cracks in a test piece for self-repairing performance testing according to claim 1, characterized in that: The cutting line is a nylon line.

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