Self-repairing performance testing device for cement-based capillary crystalline material

Abstract

The utility model discloses a self-repairing performance testing device for a cement-based capillary crystalline material, relates to the technical field of cement-based capillary crystalline materials, and aims to solve the problems that concrete needs to be transferred when a subsequent test is carried out, for example, concrete cracks are expanded in the transferring process, and the subsequent test effect is easily influenced. A placing box is fixed on the upper surface of the device base, a pressurizing mechanism for crushing a test material is mounted at the upper end of the device base, and a material conveying mechanism for testing the test material is mounted on the right side of the device base. According to the device disclosed by the utility model, Ca (OH) 2 and CO2 in the air react to generate CaCO3 and unhydrated cement clinker are continuously hydrated to generate a certain crystal or amorphous product to repair a test material structure when the test material structure has a micro crack and under the condition of certain humidity, and then the repair condition of the crack is observed by using a stereoscopic microscope, so that the test material structure can be repaired. And the test can be completed.

Description

Technical Field

[0001] The utility model relates to the field of cement-based permeable crystallization materials, in particular to a self-repairing performance test device for cement-based permeable crystallization materials. Background Art

[0002] Cement-based penetrating crystallization materials are primarily composed of Portland cement, carefully selected quartz sand, and specialized active chemicals. These components react physically and chemically with water, forming water-insoluble dendritic crystals that block tiny cracks and pores in concrete, effectively waterproofing it. The self-healing performance test device for cement-based penetrating crystallization materials is specifically designed to test and evaluate the material's self-healing capabilities. It simulates the crack formation and water penetration processes in real environments, and allows for observation and analysis of the material's self-healing effects.

[0003] A Chinese utility model (publication number: CN216484427U) discloses a testing device for impact-induced cracking in concrete. The device comprises a striking mechanism and a concrete embedded component. The embedded component is embedded in the concrete to be tested, with its upper surface flush with the concrete surface. The striking mechanism is positioned directly above the embedded component. The striking mechanism generates longitudinal cracks in the concrete through the impact force generated when the striking mechanism strikes the embedded component. This facilitates analysis of the effects of impact loads on self-healing concrete damage and lays a solid foundation for further research into the mechanisms of impact damage to self-healing concrete.

[0004] In the above technical solution, the impact force generated when the knocking mechanism falls onto the concrete embedded parts embedded in the concrete causes longitudinal cracks in the concrete for subsequent testing. However, when conducting subsequent tests, the concrete needs to be transferred. If the cracks in the concrete expand during the transfer process, it is easy to affect the subsequent test results. Therefore, a self-repairing performance test device for cement-based permeable crystallization materials is now proposed. Utility Model Content

[0005] In order to improve the problem that concrete needs to be transferred during subsequent tests, and concrete cracks expand during the transfer process, which easily affects the subsequent test results, the utility model provides a self-repairing performance test device for cement-based permeable crystallization materials.

[0006] The utility model provides a self-repairing performance test device for cement-based permeable crystallization materials, which adopts the following technical solutions:

[0007] A self-repairing performance testing device for cement-based permeable crystallization materials, comprising a device base, a placement box fixed to the upper surface of the device base, a pressurizing mechanism for crushing the test material installed at the upper end of the device base, and a feeding mechanism for testing the test material installed on the right side of the device base;

[0008] The pressurizing mechanism includes a fixing rod, two of which are fixed to the upper end of the device base, and a mounting shell fixed to the upper end of the two fixing rods. A stepper motor is fixed to the inside of the mounting shell by bolts, and a driving gear is fixed to the power output shaft of the stepper motor, and a driven gear is meshed with one side of the driving gear.

[0009] By adopting the above technical solution, the stepping motor drives the driving gear to engage with the driven gear to rotate, thereby driving the screw rod to rotate and drive the pressurizing mechanism.

[0010] Optionally, a screw rod is fixed in the vertical direction inside the driven gear, and the lower end of the screw rod is threadedly connected to a threaded tube.

[0011] By adopting the above technical solution, the threaded pipe connected with the thread can be driven to move vertically when the screw rod rotates.

[0012] Optionally, a movable plate is fixed to the lower end of the threaded tube, and three groups of pressure heads are fixed at equal intervals on the lower surface of the movable plate.

[0013] By adopting the above technical solution, the movable plate moves downward, thereby exerting pressure on the test material, so that most of the cracks generated in the test material are cracks smaller than 400 microns.

[0014] Optionally, two guide tubes are fixed to the upper surface of the movable plate, and the interiors of the two guide tubes are telescopically connected to guide rods fixed to the mounting shell.

[0015] By adopting the above technical solution, a guiding function can be achieved through the cooperation of the guide tube and the guide rod.

[0016] Optionally, the feeding mechanism includes a water tank, which is fixed on the right side of the device base. A delivery pump is fixed inside the water tank, and the output end of the delivery pump is connected to a delivery pipe.

[0017] By adopting the above technical solution, the delivery pump in the water storage tank is started to pump out the permeated water and transport the permeated water through the delivery pipe.

[0018] Optionally, the end of the delivery pipe is connected to a flow cavity opened inside the placement box, and the inner wall of the placement box is provided with a spray hole connected to the flow cavity.

[0019] By adopting the above technical solution, the material is dispensed into the placement box through the nozzle. When microcracks appear in the test material structure and under certain humidity conditions, the Ca(OH)2 around the cracks reacts with CO2 in the air to generate CaCO3, and the unhydrated cement clinker continues to hydrate to generate certain crystals or amorphous products to repair the cracks. The crack repair status is then observed with a stereo microscope, and the test is completed.

[0020] Optionally, one side of the placement box is connected to a sewage pipe, and a valve is fixed to the outer wall of the sewage pipe.

[0021] By adopting the above technical solution, the waste water in the storage box can be easily discharged by opening the valve on the sewage pipe.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. This utility model uses a stepper motor to drive the driving gear to mesh with the driven gear, which in turn drives the screw to rotate, driving the pressurizing mechanism and moving the movable plate downward, thereby applying pressure to the test material, so that most cracks generated in the test material are less than 400 microns;

[0024] 2. The utility model dispenses the material into the placement box through the spray hole. When micro cracks appear in the test material structure and under certain humidity conditions, Ca(OH)2 around the cracks reacts with CO2 in the air to generate CaCO3, and the unhydrated cement clinker continues to hydrate to generate certain crystals or amorphous products to repair the cracks. The crack repair status is then observed with a stereo microscope to complete the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the movable plate of the utility model;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of the storage box of the utility model;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the water storage tank of the utility model.

[0029] Description of reference numerals:

[0030] 1. Device base; 2. Placement box; 3. Fixing rod; 31. Mounting shell; 32. Stepper motor; 33. Driving gear; 34. Driven gear; 35. Screw; 36. Threaded pipe; 37. Movable plate; 38. Pressure head; 4. Guide tube; 5. Guide rod; 6. Water tank; 61. Delivery pump; 62. Delivery pipe; 63. Flow chamber; 64. Spray hole; 7. Drain pipe; 8. Valve. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-Figure 4 This application is described in further detail.

[0032] Please refer to Figure 1-Figure 4 A self-repairing performance test device for cement-based permeable crystallization materials includes a device base 1, a placement box 2 is fixed to the upper surface of the device base 1, a pressure mechanism for crushing the test material is installed on the upper end of the device base 1, and a feeding mechanism for testing the test material is installed on the right side of the device base 1;

[0033] The pressurizing mechanism includes a fixing rod 3, and there are two fixing rods 3. Both fixing rods 3 are fixed to the upper end of the device base 1. The upper ends of the two fixing rods 3 are fixed with a mounting shell 31. A stepper motor 32 is fixed to the inside of the mounting shell 31 by bolts. The power output shaft of the stepper motor 32 is fixed with a driving gear 33. A driven gear 34 is engaged with one side of the driving gear 33. The stepper motor 32 drives the driving gear 33 to engage with the driven gear 34 to rotate, thereby driving the screw rod 35 to rotate, thereby driving the pressurizing mechanism.

[0034] Reference Figure 1 and Figure 2 A screw rod 35 is fixed vertically inside the driven gear 34. The lower end of the screw rod 35 is threadedly connected to a threaded tube 36. When the screw rod 35 rotates, it can drive the threaded tube 36 to move vertically. A movable plate 37 is fixed to the lower end of the threaded tube 36. Three sets of pressure heads 38 are fixed at equal intervals on the lower surface of the movable plate 37. The movable plate 37 moves downward, thereby applying pressure to the test material, so that most of the cracks generated in the test material are cracks less than 400 microns.

[0035] Two guide tubes 4 are fixed to the upper surface of the movable plate 37 , and the interiors of the two guide tubes 4 are telescopically connected to guide rods 5 fixed to the mounting shell 31 , and the cooperation between the guide tubes 4 and the guide rods 5 can play a guiding role.

[0036] Reference Figure 1 、 Figure 3 and Figure 4The feeding mechanism includes a water storage tank 6, which is fixed to the right side of the device base 1. A delivery pump 61 is fixed inside the water storage tank 6. The output end of the delivery pump 61 is connected to a delivery pipe 62. When the delivery pump 61 in the water storage tank 6 is started, the permeated water is pumped out and the permeated water is delivered through the delivery pipe 62.

[0037] The end of the conveying pipe 62 is connected to a flow chamber 63 opened inside the placement box 2. The inner wall of the placement box 2 is provided with a nozzle 64 that is interconnected with the flow chamber 63. The wastewater is dispensed into the placement box 2 through the nozzle 64. When microcracks appear in the test material structure and under certain humidity conditions, the Ca(OH)2 around the cracks reacts with the CO2 in the air to generate CaCO3, and the unhydrated cement clinker continues to hydrate to generate certain crystals or amorphous products to repair the cracks. The repair of the cracks is then observed with a stereo microscope, and the test is completed. A sewage pipe 7 is connected to one side of the placement box 2, and a valve 8 is fixed on the outer wall of the sewage pipe 7. By opening the valve 8 on the sewage pipe 7, the wastewater in the placement box 2 can be easily discharged.

[0038] The implementation principle of the present invention is as follows: before using the self-healing performance test device of the cement-based infiltrated crystallization material, the device base 1 is first placed in a suitable position. When in use, the material to be tested is placed inside the placement box 2, and the driver drives the stepper motor 32 to start through the mounting shell 31 provided on the fixed rod 3, driving the driving gear 33 to engage the driven gear 34 to rotate, thereby driving the screw rod 35 to rotate. With the cooperation of the guide tube 4 and the guide rod 5, the screw rod 35 can drive the threaded tube 36 connected by the thread to move vertically when rotating, thereby driving the movable plate 37 to move downward. At this time, the pressure head 38 at the lower end of the movable plate 37 contacts the upper surface of the material. Since the stepper motor 32 is driven by the driver, the rotation angle and number of steps of the stepper motor 32 can be precisely controlled, thereby precisely controlling the rotation of the screw rod 35. The movable plate 37 is movable, so as to ensure that the position of the movable plate 37 can be adjusted, thereby realizing the pressure applied to the test material, so that most of the cracks generated in the test material are cracks smaller than 400 microns. After the cracks are generated, the movable plate 37 is driven to reset, and the delivery pump 61 in the water storage tank 6 is started to extract the permeated water, and send it to the flow cavity 63 through the delivery pipe 62, and then distribute it to the placement box 2 through the nozzle 64. When microcracks appear in the structure of the test material and under certain humidity conditions, the Ca(OH)2 around the cracks reacts with the CO2 in the air to generate CaCO3, and the unhydrated cement clinker continues to hydrate to generate certain crystals or amorphous products to repair the cracks. The crack repair situation is then observed with a stereo microscope to complete the test. By opening the valve 8 on the drain pipe 7, the wastewater in the placement box 2 can be easily discharged.

[0039] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-repairing performance test device for cement-based infiltration crystallization materials, comprising a device base (1), characterized in that: A placement box (2) is fixed to the upper surface of the device base (1), a pressurizing mechanism for crushing the test material is installed at the upper end of the device base (1), and a feeding mechanism for testing the test material is installed on the right side of the device base (1); The pressurizing mechanism comprises a fixing rod (3), wherein two fixing rods (3) are provided, and the two fixing rods (3) are fixed to the upper end of the device base (1), and the upper ends of the two fixing rods (3) are fixed with a mounting shell (31), and a stepping motor (32) is fixed inside the mounting shell (31) by bolts, and a driving gear (33) is fixed to the power output shaft of the stepping motor (32), and a driven gear (34) is meshed on one side of the driving gear (33).

2. A self-repairing performance testing device for cement-based infiltration crystallization materials according to claim 1, characterized in that: A screw rod (35) is fixed in the vertical direction inside the driven gear (34), and a threaded tube (36) is threadedly connected to the lower end of the screw rod (35).

3. A self-repairing performance testing device for cement-based infiltration crystallization materials according to claim 2, characterized in that: A movable plate (37) is fixed to the lower end of the threaded tube (36), and three groups of pressure heads (38) are fixed at equal intervals on the lower surface of the movable plate (37).

4. A self-repairing performance testing device for cement-based infiltration crystallization materials according to claim 3, characterized in that: Two guide tubes (4) are fixed to the upper surface of the movable plate (37), and the interiors of the two guide tubes (4) are telescopically connected to guide rods (5) fixed to the mounting shell (31).

5. The self-repairing performance testing device of a cement-based infiltration crystallization material according to claim 1, characterized in that: The feeding mechanism comprises a water storage tank (6), the water storage tank (6) being fixed on the right side of the device base (1), a delivery pump (61) being fixed inside the water storage tank (6), and an output end of the delivery pump (61) being connected to a delivery pipe (62).

6. A self-repairing performance testing device for cement-based infiltration crystallization materials according to claim 5, characterized in that: The end of the delivery pipe (62) is connected to a flow cavity (63) opened inside the placement box (2), and the inner wall of the placement box (2) is provided with a spray hole (64) that is interconnected with the flow cavity (63).

7. The self-repairing performance testing device of a cement-based infiltration crystallization material according to claim 1, characterized in that: One side of the placement box (2) is connected to a sewage pipe (7), and a valve (8) is fixed to the outer wall of the sewage pipe (7).

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