CN110646449A - Concrete temperature raising and reducing device and method for CT scanning - Google Patents
Concrete temperature raising and reducing device and method for CT scanning Download PDFInfo
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- CN110646449A CN110646449A CN201910926532.0A CN201910926532A CN110646449A CN 110646449 A CN110646449 A CN 110646449A CN 201910926532 A CN201910926532 A CN 201910926532A CN 110646449 A CN110646449 A CN 110646449A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/27—Control of temperature characterised by the use of electric means with sensing element responsive to radiation
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Abstract
The invention discloses a concrete temperature raising and reducing device and method for CT scanning, which comprises a heating device, a temperature control display device, a water spray cooling device, a drainage device and a shell, wherein the heating device is arranged on the shell; the shell is made of heat insulating materials; a heating washer of the heating device is arranged at the bottom of the shell, a plurality of fixing blocks are fixed on the heating washer, and concrete test blocks are placed among the plurality of fixing blocks; the temperature probe and the temperature controller of the temperature control device are arranged in the shell, the heating gasket is connected with the output end of the temperature controller, and the temperature probe is connected with the temperature controller; the water spray cooling device is fixed at the top of the shell, and the water inlet pipe extends into the shell; the spray head is connected with the water inlet pipe; the water outlet of the drainage device is a through hole at the bottom of the shell, and the drainage pipe is connected with the water outlet; the bottom of the shell is provided with a wire hole. The microscopic cracks, pore structures and moisture migration changes of the concrete at different temperatures and different cooling rates can be monitored in real time by using a CT tomography technology.
Description
Technical Field
The invention belongs to the field of performance of concrete materials, and relates to a concrete temperature raising and lowering device and method for CT scanning.
Background
At present, a concrete high-temperature experiment mainly comprises two stages, namely high temperature and high temperature. Because the difficulty of test equipment and devices at high temperature is higher, more tests are researched at present after high temperature. However, before the concrete test at high temperature, people usually use natural cooling and immersion cooling to simulate fire fighting. In fact, concrete micro-cracks and pore changes are very sensitive to temperature and load, and fire-fighting high-pressure spray cooling and experimental natural cooling and water immersion cooling have very different fine and micro influences on concrete. The concrete is suddenly cooled by high-pressure water spraying after high temperature, the unevenness of internal and external temperature, the impact of water pressure, the generation amount of hydration products with different depths, the formation and the expansion of micro cracks, the change of pores and other microscopic characteristic changes can greatly influence the macroscopic performance of the concrete.
Although many scholars have studied the microscopic mechanism of concrete by using the medical CT scanning technology, the microscopic study is limited to natural cooling at high temperature or water immersion cooling at high temperature due to the limitation of high-temperature and medical CT scanning equipment, and the influence of the material pore, water migration and crack change characteristics under the simultaneous action of high-temperature and high-pressure spraying on the structural failure mechanism cannot be monitored in real time and studied accurately. Since medical CT scanners cannot withstand the high temperatures, the real-time heating of the test piece must take into account the following problems: the external temperature of the heating equipment can not be higher than the room temperature, the experimental device can not influence the CT scanning result, and the medical CT equipment is prevented from being damaged by high temperature and explosion and causing danger when the real-time heating is carried out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a concrete temperature raising and reducing device and method for CT scanning, which can monitor microscopic cracks, pore structures and water migration changes of concrete at different temperatures and different cooling rates in real time by using a CT tomography technology.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a concrete temperature raising and reducing device for CT scanning comprises a heating device, a temperature control display device, a water spray cooling device, a drainage device and a shell;
the shell is a hollow closed structure and is made of heat insulating materials; the front surface of the shell is provided with a bin door;
the heating device comprises a heating gasket and a plurality of fixing blocks, the heating gasket is arranged at the bottom of the shell, the fixing blocks are fixed on the heating gasket, and concrete test blocks are placed among the fixing blocks;
the temperature control device comprises a temperature probe and a temperature controller; the temperature probe and the temperature controller are arranged in the shell, the input end of the heating gasket is connected with the output end of the temperature controller through a waterproof high-temperature-resistant lead, and the output end of the temperature probe is connected with the input end of the temperature controller through a waterproof high-temperature-resistant lead;
the water spray cooling device is fixed at the top of the shell and comprises a spray head and a water inlet pipe, and the water inlet pipe extends into the shell; the nozzle is connected with one end of the water inlet pipe extending into the shell, and faces the top surface of the concrete test block;
the drainage device is positioned at the bottom of the shell and comprises a water outlet and a drainage pipe, the water outlet is a through hole at the bottom of the shell, and the drainage pipe is connected with the water outlet;
the bottom of the shell is provided with a wire hole, a power plug wire of the temperature controller extends into the shell through the wire hole, and the wire hole is provided with a heat insulation sealing strip.
Preferably, the heating wires of the heating washer are arranged in a plurality of rectangles, the rectangles are concentric, and the bottom of the fixing block is provided with a buckle which is clamped on the heating washer.
Preferably, the water inlet pipe is internally provided with a pressure valve.
Preferably, the spray head forms an angle of 45 degrees with the horizontal direction.
Preferably, the bottom of the housing is provided with a plurality of rubber mounts.
Preferably, the temperature probe is an infrared temperature probe.
Preferably, the temperature controller is wirelessly connected with a remote controller.
The CT scanning concrete temperature increasing and decreasing method based on any one of the devices comprises the following steps;
step one, opening a bin door of a shell, placing a concrete test block between fixed blocks, and then closing the bin door;
connecting a water inlet pipe of the cooling device with a water source, and connecting a water outlet pipe of the drainage device with a sewer;
thirdly, connecting the temperature controller with a power supply, and placing the device into a CT scanner;
turning on a power switch of a temperature controller of the device, setting the temperature, starting heating equipment, and carrying out layered scanning once by the CT scanner when the temperature rises by 50-100 ℃;
step five, after the temperature in the shell reaches the set temperature, injecting water into the water inlet pipe;
step six, monitoring the temperature of the concrete test block by a temperature probe, and carrying out layered scanning once by a CT (computed tomography) scanner when the temperature is reduced by 50-100 ℃;
seventhly, monitoring the temperature of the concrete test block by a temperature probe, stopping injecting water into the water inlet pipe after the temperature reaches a set cooling temperature, and carrying out layered scanning once by the CT scanner every 10-30 minutes;
and step eight, after the temperature of the concrete test block reaches the room temperature, finishing the CT scanning, taking out the device, breaking off all connecting circuits, opening the equipment, taking out the concrete test block, and cleaning residual water stains and debris.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the heating device, the temperature control display device, the water spray cooling device and the drainage device are arranged in the closed shell made of the high-temperature explosion-proof material, so that the temperature rise and the temperature drop of the concrete can be realized in the closed shell, and the heat cannot leak, so that the CT scanner can carry out tomography scanning on the concrete in the shell, and the microscopic cracks, the pore structures and the moisture migration changes of the concrete at different temperatures and different temperature drop rates can be monitored in real time.
Further, the fixed block passes through the buckle card on the heating gasket, can be connected with the heater strip of unidimensional rectangle according to the size of concrete test block to change the interval between the fixed block, carry out the centre gripping to unidimensional concrete test block.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic view of the housing structure of the present invention;
fig. 3 is a schematic view of the heating coil arrangement of the heating washer of the present invention.
Wherein: 1-a shell; 2-boss; 3-a rubber support; 4-heating the gasket; 5-insulating board; 6, fixing blocks; 7-temperature probe; 8-a temperature controller; 9-a remote controller; 10-a spray head; 11-a pressure valve; 12-a water inlet pipe; 13-water outlet; 14-a drain pipe; 15-waterproof high temperature resistant wire; 16-a wire guide hole; 17-concrete test block.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the device for a concrete damage mechanism after CT scanning temperature rise and drop comprises a heating device, a temperature control display device, a water spray cooling device, a drainage device and a housing 1.
The shell 1 is a hollow cuboid structure and is made of high-temperature-resistant explosion-proof glass; a boss 2 is arranged at the bottom of the inner cavity of the shell 1, and the height of the boss 2 is 15 cm-30 cm; the front surface of the shell 1 is provided with a bin door, and a handle is arranged on the bin door.
Four corners of the bottom of the shell 1 are provided with rubber supports 3, and the height of each support is 5-8 cm.
The heating device comprises a red ceramic heating gasket 4, a heat insulation plate 5 and four fixing blocks 6, wherein the heat insulation plate 5 is arranged on the boss 2, the heating gasket 4 is arranged on the heat insulation plate 5, and the length and width of the thermal resistance ring are 80-200 mm multiplied by 80-200 mm; have four fixed blocks 6 on the heating packing ring 4, four fixed blocks 6 enclose into a rectangle, and 6 bottoms of fixed block are provided with the buckle, can block on the heating packing ring 4, and four can be according to the length and the interval of the width adjustment every two relative fixed blocks 6 of concrete test block 17, and concrete test block 17 is fixed by fixed block 6.
The temperature control device comprises a temperature probe 7, a temperature controller 8 and a remote controller 9; the temperature probe 7 is arranged in the shell 1 and used for measuring the temperature of the concrete test block 17, and the temperature probe 7 adopts an infrared temperature probe 7; the temperature controller 8 is arranged between the heat insulation plate 5 and the boss 2, the temperature controller 8 is provided with a temperature display screen, all the outer surfaces of the temperature controller 8 except the temperature display screen are pasted with heat insulation layers, and the temperature display screen is a high-temperature resistant liquid crystal screen; the remote controller 9 is in wireless connection with the temperature controller 8, the input end of the heating gasket 4 is connected with the output end of the temperature controller 8 through a waterproof high-temperature-resistant wire 15, and the output end of the temperature probe 7 is connected with the input end of the temperature controller 8 through the waterproof high-temperature-resistant wire 15.
The water spray cooling device is fixed on the top of the shell 1 and comprises a spray head 10, a pressure valve 11 and a water inlet pipe 12. The water inlet pipe 12 is round, one end of the water inlet pipe 12 is connected with a tap water pipe, and the other end of the water inlet pipe 12 extends into the shell 1; the pressure valve 11 is arranged in the water inlet pipe 12, and the pressure of the pressure valve 11 can be adjusted to be 1-8 Mpa; the shower nozzle 10 is connected with the one end that inlet tube 12 stretched into the casing 1 inside, and the shower nozzle 10 is 45 contained angles towards concrete test block 17 top surface with the horizontal direction, is located 15cm department above the concrete test block 17.
The drainage device is positioned at the bottom of the shell 1 and comprises a water outlet 13 and a drainage pipe 14, the water outlet 13 is a through hole at the bottom of the shell 1, one end of the drainage pipe 14 is connected with the water outlet 13, and the other end of the drainage pipe is connected with an indoor drainage pipe 14.
The bottom of the shell 1 is provided with a wire hole 16, a power plug wire of the temperature controller 8 extends into the shell 1 through the wire hole 16 to connect the temperature controller 8 and the temperature probe 7, and the wire hole 16 is provided with a heat insulation sealing strip.
The test process based on the device is as follows:
step one, opening a bin door of the shell 1, placing the concrete test block 17 on a heating resistance ring of a heating device, adjusting the position, fixing the fixing block 6, and then closing the bin door.
And step two, connecting the water inlet pipe 12 of the cooling device with a water tap, and connecting the water outlet pipe of the drainage device with a sewer.
And step three, connecting a power line of the temperature control device with an indoor plug, and pushing the device into the CT scanner.
And step four, turning on a power switch of the device, setting the temperature, starting the heating equipment, and carrying out layered scanning once on the CT machine when the temperature rises by 50-100 ℃.
And step five, after the temperature in the shell 1 reaches the set temperature, opening a water faucet, controlling a water inlet pressure valve 11 of the cooling device, controlling the pressure within 1-8 MPa, and spraying the high-temperature concrete test block 17 by continuous high-pressure water flow.
And sixthly, monitoring the temperature of the concrete test block 17 by the infrared temperature probe 7, and scanning the concrete test block once in a layering mode by the medical CT machine when the temperature is reduced by 50-100 ℃.
And seventhly, monitoring that the temperature of the lower surface of the concrete test block 17 reaches the set cooling temperature by the infrared temperature probe 7, closing the pressure valve 11 of the cooling device, closing the tap water faucet, and carrying out layered scanning on the medical CT machine once every 10-30 minutes until the temperature of the concrete test block 17 reaches the room temperature.
And step eight, after the CT scanning is finished, taking out the device, cutting off all connecting circuits, opening the equipment, taking out the concrete test block 17, and cleaning residual water stains and debris.
And step nine, storing the CT scanning data, performing image processing, performing the microscopic three-dimensional reconstruction of the concrete test block 17 and the concrete test block 17 according to the processing result, and researching the microscopic crack and pore change rule of the concrete test block 17.
And step ten, carrying out compression resistance, bending resistance, impact strength and durability tests on the concrete test block 17 after high temperature-cooling and researching the influence mechanism of microscopic change on the macroscopic performance of the concrete test block 17 by combining with the CT microscopic test result.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A concrete temperature raising and reducing device for CT scanning is characterized by comprising a heating device, a temperature control display device, a water spray cooling device, a drainage device and a shell (1);
the shell (1) is a hollow closed structure and is made of heat insulating materials; the front surface of the shell (1) is provided with a bin door;
the heating device comprises a heating gasket (4) and a plurality of fixing blocks (6), the heating gasket (4) is arranged at the bottom of the shell (1), the fixing blocks (6) are fixed on the heating gasket (4), and concrete test blocks (17) are arranged among the fixing blocks (6);
the temperature control device comprises a temperature probe (7) and a temperature controller (8); the temperature probe (7) and the temperature controller (8) are arranged in the shell (1), the input end of the heating gasket (4) is connected with the output end of the temperature controller (8) through a waterproof high-temperature-resistant wire (15), and the output end of the temperature probe (7) is connected with the input end of the temperature controller (8) through the waterproof high-temperature-resistant wire (15);
the water spray cooling device is fixed at the top of the shell (1) and comprises a spray head (10) and a water inlet pipe (12), and the water inlet pipe (12) extends into the shell (1); the spray head (10) is connected with one end of the water inlet pipe (12) extending into the shell (1), and the spray head (10) faces the top surface of the concrete test block (17);
the drainage device is positioned at the bottom of the shell (1) and comprises a water outlet (13) and a drainage pipe (14), the water outlet (13) is a through hole at the bottom of the shell (1), and the drainage pipe (14) is connected with the water outlet (13);
the bottom of the shell (1) is provided with a wire hole (16), a power plug wire of the temperature controller (8) extends into the shell (1) through the wire hole (16), and the wire hole (16) is provided with a heat insulation sealing strip.
2. The concrete temperature raising and lowering device for CT scanning according to claim 1, characterized in that the heating wires of the heating washer (4) are arranged in several rectangles, the rectangles are concentric, the bottom of the fixing block (6) is provided with a buckle, and the buckle is clamped on the heating washer (4).
3. The concrete temperature raising and lowering device for CT scanning of claim 1 is characterized in that the pressure valve (11) is arranged inside the water inlet pipe (12).
4. The concrete temperature raising and lowering device for CT scanning according to claim 1, characterized in that the nozzle (10) is at an angle of 45 ° to the horizontal.
5. The concrete temperature raising and lowering device for CT scanning according to claim 1, characterized in that the bottom of the shell (1) is provided with a plurality of rubber seats (3).
6. The concrete temperature raising and lowering device for CT scanning according to claim 1, characterized in that the temperature probe (7) is an infrared temperature probe (7).
7. The concrete temperature raising and lowering device for CT scanning according to claim 1, characterized in that the temperature controller (8) is wirelessly connected with a remote controller (9).
8. The CT scanning concrete temperature increasing and decreasing method based on the device of any one of claims 1-7 is characterized by comprising the following steps;
step one, opening a bin door of a shell (1), placing a concrete test block (17) between fixed blocks (6), and then closing the bin door;
connecting a water inlet pipe (12) of the cooling device with a water source, and connecting a water outlet pipe of the drainage device with a sewer;
thirdly, the temperature controller (8) is connected with a power supply, and the device is placed in a CT scanner;
turning on a power switch of a temperature controller (8) of the device, setting the temperature, starting heating equipment, and carrying out layered scanning once by the CT scanner when the temperature rises by 50-100 ℃;
step five, after the temperature in the shell (1) reaches a set temperature, injecting water into the water inlet pipe (12);
step six, monitoring the temperature of the concrete test block (17) by a temperature probe (7), and carrying out layered scanning once by a CT (computed tomography) scanner when the temperature is reduced by 50-100 ℃;
seventhly, monitoring the temperature of the concrete test block (17) by a temperature probe (7), stopping injecting water into the water inlet pipe (12) after the temperature reaches a set cooling temperature, and carrying out layered scanning once by a CT (computed tomography) scanner every 10-30 minutes;
and step eight, after the temperature of the concrete test block (17) reaches the room temperature, finishing the CT scanning, taking out the device, cutting off all connecting circuits, opening the equipment, taking out the concrete test block (17), and cleaning residual water stains and debris.
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| CN201910926532.0A CN110646449B (en) | 2019-09-27 | 2019-09-27 | Concrete temperature raising and reducing device and method for CT scanning |
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