Device and method for detecting compressive strength of grouting material test block in high temperature based on electromagnetic induction heating

Abstract

The invention discloses a high-temperature medium grouting material test block compressive strength detection device and method based on electromagnetic induction heating, the device comprises a press machine placing table, a bottom plate is placed on the press machine placing table, four stand columns are fixed on the bottom plate, a top plate is arranged on the tops of the stand columns, a clamp lower pressing plate is further fixed on the bottom plate, and a grouting material test block is placed on the clamp lower pressing plate; the periphery of the grouting material test block is surrounded by four iron sheets, arc-shaped holes are reserved in the four iron sheets, the infrared temperature sensors are aligned to the arc-shaped holes, spiral electromagnetic coils are further arranged outside the four iron sheets, a clamp upper pressing plate is arranged on the upper portion of the grouting material test block, and limiting rods penetrating through the stand columns are arranged on the left side and the right side of the upper pressing plate respectively. A semicircular lower pressing ball seat is arranged on the upper pressing plate, the sliding block makes contact with the lower pressing ball seat, a pressure sensor is arranged on the upper portion of the sliding block, and a lower pressing table of the press machine is aligned to the upper portion of the pressure sensor. The device is convenient to operate, energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention relates to a high temperature compressive performance technology of cement mortar, and in particular to a high temperature compressive test method for grouting material, and specifically to a high temperature compressive strength testing device and method for grouting material test block based on electromagnetic induction heating. Background Art

[0002] With its high efficiency, environmental protection and high quality, prefabricated construction technology has gradually become the new favorite of the construction industry under the background of industrialization reform and industrial upgrading. The widespread application of this technology has not only significantly improved construction efficiency, but also promoted the entire industry to move towards high-quality, high-standard and integrated operations while ensuring the quality of construction.

[0003] With the promotion of prefabricated buildings across the country, the fire safety of prefabricated building connectors has always been the focus of discussion among many scholars. Grouting sleeve connection technology is one of the important ways to connect prefabricated building components, and its fire resistance is a branch of prefabricated building fire protection research. At present, in this branch, some scientific research institutions mainly study the fire resistance of grouting sleeve connectors in high temperature environments of 200℃ to 1000℃.

[0004] As a high-viscosity cement-based material, grouting material is commonly used in the field of grouting sleeve technology for prefabricated buildings. The bonding performance between grouting material and steel bars, and between grouting material and sleeves directly affects the mechanical properties of grouting sleeves to a large extent. In order to study the compressive performance of grouting material under high temperature environment, there are currently two common test methods: one is to heat the grouting material test block to a specified temperature and then cool it, and test the compressive performance of the grouting after high temperature cooling. Although this method is safe and convenient, the grouting material after high temperature cooling cannot reflect its mechanical behavior under high temperature environment; the other is to heat the grouting material to a specified temperature and then take it out directly from the heating equipment, and then conduct a high temperature compressive performance test. At present, this scheme takes a long time to take out and load the grouting material test block, and the temperature of the grouting material test block itself continues to decrease with the passage of time, which cannot well reflect the relationship between the compressive strength and temperature of the grouting material test block. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a device and method for testing the compressive strength of a grouting material test block at high temperature based on electromagnetic induction heating. The device has a simple structure, low cost, and is easy to use. The method has good operability, reliable energy saving, safe testing, and accurate data.

[0006] The technical solution for realizing the present invention is:

[0007] A high-temperature medium-pressure grouting material compressive strength test device based on electromagnetic induction heating is characterized in that it includes a press machine placement platform 1, a bottom plate 2 is placed on the press machine placement platform 1, four columns 3 are fixed on the bottom plate 2, a top plate 4 fixed to the columns 3 is provided on the top of the columns 3, a clamp lower pressing plate 5 is also fixed on the bottom plate 2, a grouting material test block 6 is placed on the clamp lower pressing plate 5, the grouting material test block 6 is surrounded by four iron sheets 7, arc-shaped openings 8 are left on the four iron sheets 7, an infrared temperature sensor 9 is aligned with the arc-shaped opening 8, the tail of the infrared temperature sensor 9 is connected to the main controller 10, and the four iron sheets 7 are also provided with a A spiral electromagnetic coil 11 is also connected to the main controller 10 through a wire. A clamp upper pressure plate 12 is provided on the upper part of the grouting material test block 6. Limit rods 13 are provided on the left and right sides of the upper pressure plate 12, respectively passing through the columns 2. The lower ends of two reset springs 14 are connected to the limit rods 13 on the left and right sides, and the upper ends are connected to the top plate 4. A semicircular downward pressure ball seat 15 is also provided at the upper end of the upper pressure plate 12. The slider 16 passes through the hole 17 reserved in the middle of the top plate 4 and contacts with the downward pressure ball seat 15. A pressure sensor 18 is provided on the upper part of the slider 16, and the press lower pressure platform 19 is aligned with the upper part of the pressure sensor 18.

[0008] The specifications of the pressing support 5 are 50 mm in length, 40 mm in width and 20 mm in height.

[0009] The grouting material test block 6 is a cube, and the side length is 40 mm.

[0010] The iron sheet 7 has a thickness of 2 mm, a height of 36 mm and a width of 40 mm.

[0011] The specifications of the upper pressure support 12 are 40 mm in length, 40 mm in width and 30 mm in height.

[0012] A high temperature medium grouting material compressive strength test method based on electromagnetic induction heating, comprising the above-mentioned high temperature medium grouting material test block compressive strength detection device based on electromagnetic induction heating, the method comprising the following steps:

[0013] 1) Installation: The front, rear, left and right sides of the grouting material test block 6 are all pasted with iron sheets 7 and then placed in the electromagnetic coil 11, and the grouting material test block 6 is placed directly above the lower pressing plate 5 of the fixture, the upper pressing plate 12 is aligned directly above the grouting material, and the infrared temperature sensor 9 is aligned with the arc opening 8 and fixed;

[0014] 2) Heating: After setting the target temperature, the main controller 10 is started, and the main controller 10 outputs current to the electromagnetic coil 11. The iron sheet 7 is affected by the eddy current generated by the electromagnetic coil 11 and self-heats, and transfers the heat to the grouting material test block 6. The infrared temperature sensor 9 transmits the temperature of the grouting material test block 6 to the main controller 10 in real time, and the main controller 10 controls the current output according to the real-time temperature;

[0015] 3) Test: When the grouting material test block 6 reaches the preset temperature and stabilizes, the press is started, and the lower pressing table 19 of the press transmits the pressure to the pressure sensor 18, the slider 16, the lower pressing ball seat 15 and the upper pressing plate 12 in sequence. The grouting material test block 6 is squeezed by the upper pressing plate 12 and gradually deformed and damaged. The pressure sensor 18 can record the relationship between the pressure and time during the test and derive the maximum pressure;

[0016] 4) After the loading test is completed, turn off the main controller 10, take out the grouting material test block 6, test the next grouting material test block, repeat steps 1) to 3) to complete the test.

[0017] This technical solution has the following beneficial effects:

[0018] (1) Compared with the prior art, the technical solution solves the problem of complex process when the grouting material test block is subjected to the compressive performance test under high temperature conditions. The technical solution aims to perform in-situ heating on the compressive test equipment, that is, to heat the grouting material test block by electromagnetic induction heating, so as to realize the compressive performance study of the grouting material test block under high temperature conditions;

[0019] (3) Compared with the prior art, this technical solution reduces the energy loss problem of the grouting material test block during the heating process. This technical solution uses electromagnetic induction heating, which is more energy-saving and environmentally friendly than the existing heating furnace heating solution;

[0020] (3) Compared with the prior art, the present technical solution solves the problem of heat loss when the grouting material specimen is subjected to a mechanical property test under high temperature conditions. The present technical solution precisely heats a single specimen, eliminating the step of taking the grouting material specimen out of the high-temperature furnace before conducting the test, thereby solving the problem of heat loss in this step.

[0021] This device has a simple structure, low cost and is easy to use. This method has good operability, energy saving and reliability, safe testing and accurate data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment.

[0023] Figure 1 In the figure, 1. Press machine placement table 2. Bottom plate 3. Column 4. Top plate 5. Clamp lower pressure plate 6. Grouting material test block 7. Iron sheet 8. Arc opening 9. Infrared temperature sensor 10. Main controller 11. Electromagnetic coil 12. Upper pressure plate 13. Limit rod 14. Reset spring 15. Lower pressure ball seat 16. Slider 17. Hole 18. Pressure sensor 19. Press machine lower pressure table. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "upper", "front", "rear", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] The content of the present invention is further described below in conjunction with the drawings and embodiments, but the present invention is not limited thereto.

[0026] Example:

[0027] Reference Figure 1 A high-temperature medium-pressure grouting material compressive strength test device based on electromagnetic induction heating is characterized in that it includes a press machine placement platform 1, a bottom plate 2 is placed on the press machine placement platform 1, four columns 3 are fixed on the bottom plate 2, a top plate 4 fixed to the columns 3 is provided on the top of the columns 3, a clamp lower pressing plate 5 is also fixed on the bottom plate 2, a grouting material test block 6 is placed on the clamp lower pressing plate 5, the grouting material test block 6 is surrounded by four iron sheets 7, arc-shaped openings 8 are left on the four iron sheets 7, an infrared temperature sensor 9 is aligned with the arc-shaped opening 8, the tail of the infrared temperature sensor 9 is connected to the main controller 10, and the four iron sheets 7 are also provided with A spiral electromagnetic coil 11 is also connected to the main controller 10 through a wire. A clamp upper pressure plate 12 is provided on the upper part of the grouting material test block 6. Limit rods 13 are provided on the left and right sides of the upper pressure plate 12, respectively passing through the columns 2. The lower ends of two reset springs 14 are connected to the limit rods 13 on the left and right sides, and the upper ends are connected to the top plate 4. A semicircular downward pressure ball seat 15 is also provided at the upper end of the upper pressure plate 12. A slider 16 passes through a hole 17 reserved in the middle of the top plate 4 and contacts with the downward pressure ball seat 15. A pressure sensor 18 is provided on the upper part of the slider 16, and the press lower pressure platform 19 is aligned with the upper part of the pressure sensor 18.

[0028] The specifications of the pressing support 5 are 50 mm in length, 40 mm in width and 20 mm in height.

[0029] The grouting material test block 6 is a cube, and the side length is 40 mm.

[0030] The iron sheet 7 has a thickness of 2 mm, a height of 36 mm and a width of 40 mm.

[0031] The specifications of the upper pressure support 12 are 40 mm in length, 40 mm in width and 30 mm in height.

[0032] A high temperature medium grouting material compressive strength test method based on electromagnetic induction heating, comprising the above-mentioned high temperature medium grouting material test block compressive strength detection device based on electromagnetic induction heating, the method comprising the following steps:

[0033] 1) Installation: The front, rear, left and right sides of the grouting material test block 6 are all pasted with iron sheets 7 and then placed in the electromagnetic coil 11, and the grouting material test block 6 is placed directly above the lower pressing plate 5 of the fixture, the upper pressing plate 12 is aligned directly above the grouting material, and the infrared temperature sensor 9 is aligned with the arc opening 8 and fixed;

[0034] 2) Heating: After setting the target temperature, the main controller 10 is started, and the main controller 10 outputs current to the electromagnetic coil 11. The iron sheet 7 is affected by the eddy current generated by the electromagnetic coil 11 and self-heats, and transfers the heat to the grouting material test block 6. The infrared temperature sensor 9 transmits the temperature of the grouting material test block 6 to the main controller 10 in real time, and the main controller 10 controls the current output according to the real-time temperature;

[0035] 3) Test: When the grouting material test block 6 reaches the preset temperature and stabilizes, the press is started, and the lower pressing table 19 of the press transmits the pressure to the pressure sensor 18, the slider 16, the lower pressing ball seat 15 and the upper pressing plate 12 in sequence. The grouting material test block 6 is squeezed by the upper pressing plate 12 and gradually deformed and damaged. The pressure sensor 18 can record the relationship between the pressure and time during the test and derive the maximum pressure;

[0036] 4) After the loading test is completed, turn off the main controller 10, take out the grouting material test block 6, test the next grouting material test block, repeat steps 1) to 3) to complete the test.

Claims

1. A high temperature medium grouting material compressive strength test device based on electromagnetic induction heating, characterized in that: The press machine placement platform 1 includes a bottom plate 2 placed on the press machine placement platform 1, 4 columns 3 are fixed on the bottom plate 2, a top plate 4 fixed to the columns 3 is provided on the top of the columns 3, a clamp lower pressing plate 5 is also fixed on the bottom plate 2, a grouting material test block 6 is placed on the clamp lower pressing plate 5, the grouting material test block 6 is surrounded by 4 iron sheets 7, arc-shaped openings 8 are left on the 4 iron sheets 7, an infrared temperature sensor 9 is aligned with the arc-shaped openings 8, and the tail of the infrared temperature sensor 9 is connected to the main controller 10, and a spiral electromagnetic coil 11 is also provided on the outside of the 4 iron sheets 7, and the electromagnetic coil 1 1 is also connected to the main controller 10 through a wire. A clamp upper pressing plate 12 is provided on the upper part of the grouting material test block 6. Limit rods 13 passing through the columns 2 are arranged on the left and right sides of the upper pressing plate 12. The lower ends of two return springs 14 are connected to the limit rods 13 on the left and right sides, and the upper ends are connected to the top plate 4. A semicircular pressing ball seat 15 is also provided at the upper end of the upper pressing plate 12. A slider 16 passes through a hole 17 reserved in the middle of the top plate 4 and contacts the pressing ball seat 15. A pressure sensor 18 is provided on the upper part of the slider 16. The press lower pressing table 19 is aligned with the upper part of the pressure sensor 18.

2. The high temperature medium grouting material compressive strength test device based on electromagnetic induction heating according to claim 1 is characterized in that: The specifications of the pressing support 5 are 50 mm in length, 40 mm in width and 20 mm in height.

3. The high temperature medium grouting material compressive strength test device based on electromagnetic induction heating according to claim 1 is characterized in that: The grouting material test block 6 is a cube, and the side length is 40 mm.

4. The high temperature medium grouting material compressive strength test device based on electromagnetic induction heating according to claim 1 is characterized in that: The iron sheet 7 has a thickness of 2 mm, a height of 36 mm and a width of 40 mm.

5. The high temperature medium grouting material compressive strength test device based on electromagnetic induction heating as described in claim 1 is characterized in that: The specifications of the upper pressure support 12 are 40 mm in length, 40 mm in width and 30 mm in height.

6. A method for testing the compressive strength of grouting material in high temperature based on electromagnetic induction heating, comprising the device for testing the compressive strength of grouting material test block in high temperature based on electromagnetic induction heating according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: 1) Installation: The front, rear, left and right sides of the grouting material test block 6 are all pasted with iron sheets 7 and then placed in the electromagnetic coil 11, and the grouting material test block 6 is placed directly above the lower pressing plate 5 of the fixture, the upper pressing plate 12 is aligned directly above the grouting material, and the infrared temperature sensor 9 is aligned with the arc opening 8 and fixed; 2) Heating: After setting the target temperature, the main controller 10 is started, and the main controller 10 outputs current to the electromagnetic coil 11. The iron sheet 7 is affected by the eddy current generated by the electromagnetic coil 11 and self-heats, and transfers the heat to the grouting material test block 6. The infrared temperature sensor 9 transmits the temperature of the grouting material test block 6 to the main controller 10 in real time, and the main controller 10 controls the current output according to the real-time temperature; 3) Test: When the grouting material test block 6 reaches the preset temperature and stabilizes, the press is started, and the lower pressing table 19 of the press transmits the pressure to the pressure sensor 18, the slider 16, the lower pressing ball seat 15 and the upper pressing plate 12 in sequence. The grouting material test block 6 is squeezed by the upper pressing plate 12 and gradually deformed and damaged. The pressure sensor 18 can record the relationship between the pressure and time during the test and derive the maximum pressure; 4) After the loading test is completed, turn off the main controller 10, take out the grouting material test block 6, test the next grouting material test block, repeat steps 1) to 3) to complete the test.

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