CN110646393A - Device and method for testing expansion stress and deformation distribution of foam concrete - Google Patents
Device and method for testing expansion stress and deformation distribution of foam concrete Download PDFInfo
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- CN110646393A CN110646393A CN201910973433.8A CN201910973433A CN110646393A CN 110646393 A CN110646393 A CN 110646393A CN 201910973433 A CN201910973433 A CN 201910973433A CN 110646393 A CN110646393 A CN 110646393A
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 91
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000009826 distribution Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000003973 paint Substances 0.000 claims abstract description 19
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000007769 metal material Substances 0.000 claims abstract description 3
- 239000011247 coating layer Substances 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 2
- 239000004035 construction material Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001723 curing Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 238000001029 thermal curing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000013007 heat curing Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003220 pyrenes Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
A device and a method for testing expansion stress and deformation distribution of foam concrete belong to the field of performance testing of civil construction materials. The invention solves the problem that the prior art can not realize the real-time and continuous measurement of the expansion stress and deformation distribution of the foam concrete in the hot-curing environment. The mould is the metal material, and the heating plate has been installed to the bottom of mould, and temperature sensor has been installed to the side of mould, the heating plate with between the temperature control case, between temperature sensor and the temperature control case and the CCD camera is connected through the wire respectively with the computer of installing the PSP calbiration system, and foam concrete is installed in the mould, and rubber film bonds at foam concrete's upper surface, and rubber film's upper surface spraying has the pressure sensitive paint layer, and excitation light source and CCD camera set firmly respectively in the top of mould, and be provided with first light filter between excitation light source and the pressure sensitive paint layer, are provided with the second light filter between CCD camera and the pressure sensitive paint layer.
Description
Technical Field
The invention relates to a device and a method for testing expansion stress and deformation distribution of foam concrete, belonging to the field of performance testing of civil construction materials.
Background
As is well known, the foam concrete has excellent performances of light weight, high strength, heat preservation, heat insulation, sound insulation, fire resistance, shock absorption, earthquake resistance and the like because the interior of the foam concrete is provided with a large number of closed fine pores. In recent years, foamed concrete has been widely used as a building partition or a filler for non-structural members or structural heat-insulating integrated building members. With the development of fabricated buildings, more attention is paid to building partitions using foam concrete as a filling material. The foam concrete can effectively reduce the self weight of the structure due to low density, reduce the consumption of raw materials and save energy and labor cost in the process of factory preparation, transportation and installation. In actual industrial production, in order to accelerate the turnover efficiency of the formwork and shorten the production period, almost all cement concrete members need to be subjected to steam curing within hours after being poured so as to improve the early strength. However, due to the large amount of air holes in the foam concrete, the thermal expansion of the air under steam curing conditions can cause significant volume expansion of the foam concrete. Under the restraint of the template, the self-expansion compressive stress generated by heating can induce the crack development of the foam concrete, so that the appearance quality and the overall mechanical property of the member are reduced.
In actual industrial production, the volume deformation of the foam concrete under the thermal curing condition is the closest to that of the foam concrete under the steam curing condition, but at present, devices for measuring the volume deformation of the concrete at home and abroad are all carried out under the standard curing or normal-temperature curing condition. For steam curing concrete, because of the reason of maintenance condition, it is complicated to directly lead to realizing the device structure of steam curing, in order to realize the test and be convenient for the test, also can select to replace steam curing condition with hot curing condition, but generally take out the test piece from steaming curing environment or hot curing environment and test again, not only disturbed the concrete intensity development under steam curing or hot curing condition, because remove the test piece in the test process simultaneously, lead to the result accuracy of obtaining relatively poor, can not reflect actual conditions.
Disclosure of Invention
The invention aims to solve the problem that the prior art can not realize real-time and continuous measurement of expansion stress and deformation distribution of foam concrete in a hot-curing environment, and further provides a device and a method for testing the expansion stress and deformation distribution of the foam concrete.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a device for testing expansion stress and deformation distribution of foam concrete comprises a mold, a heating plate, a rubber film, a transparent cover plate, an excitation light source, a light source support, a CCD camera, a camera support, a temperature control box and a PSP calibration system installed in a computer, wherein the mold is made of metal, the top opening of the mold is arranged, the bottom of the mold is provided with the heating plate, the side surface of the mold is provided with a temperature sensor, the heating plate is connected with the temperature control box, the temperature sensor is connected with the temperature control box, the CCD camera is connected with the computer provided with the PSP calibration system through leads, the foam concrete is installed in the mold, the rubber film is adhered to the upper surface of the foam concrete, the upper surface of the rubber film is sprayed with a pressure-sensitive coating layer, the transparent cover plate is covered on the top of the mold, and the excitation light source and the CCD camera are respectively and fixedly arranged above the, and a first optical filter is arranged between the excitation light source and the pressure-sensitive coating layer, and a second optical filter is arranged between the CCD camera and the pressure-sensitive coating layer.
Further, the mould is of a cubic structure, cavities are machined in the side portion and the bottom portion of the mould, the heating plate is arranged in the cavity in the bottom portion, and the temperature sensor is arranged in the cavity in the side portion.
Further, the number of the temperature sensors is two, and the two temperature sensors are symmetrically arranged in cavities of two side parts of the mold.
Further, a heat insulation layer is arranged outside the mold.
Further, the mould inside wall is provided with the polytetrafluoroethylene layer.
Furthermore, the excitation light source is fixedly arranged above the die through the light source support, and the CCD camera is fixedly arranged above the die through the camera support.
Further, the mould is an iron mould.
Further, the transparent cover plate is an organic glass cover plate.
A method for testing the expansion stress and deformation distribution of the foam concrete by adopting the device comprises the following steps:
pouring foam concrete into the mold until the height of the inner wall of the mold is 1/2-2/3, vibrating to be dense, and then leveling the surface of the foam concrete;
step two, uniformly spraying pressure-sensitive paint on the upper surface of the rubber film, and polishing after the pressure-sensitive paint is cured to form a pressure-sensitive paint layer;
thirdly, placing a rubber film on the upper surface of the foam concrete, and pressing the rubber film to be tightly adhered to the upper surface of the foam concrete;
step four, covering a transparent cover plate on the top of the mold, opening an excitation light source and a PSP calibration system, and adjusting the positions of the excitation light source and a CCD camera, so that ultraviolet light generated by the excitation light source can be uniformly irradiated on the upper surface of the foam concrete, and the CCD camera can completely capture the image of the upper surface of the foam concrete;
fifthly, adjusting the exposure time of the CCD camera until the CCD camera can shoot a high-resolution image of the upper surface of the foam concrete;
setting the target temperature of the temperature control box to be 0-60 ℃, adjusting the shooting frequency of a CCD camera to be 8-30 frames/second, and counting the fluorescence intensity of different positions of the upper surface image of the foam concrete through post-processing software in a PSP calibration system to obtain luminous intensity images in different stress states, so as to obtain the surface expansion stress distribution of the restrained foam concrete when being heated;
and seventhly, deducing corresponding deformation distribution according to the elastic modulus of the foam concrete input in advance and through the constitutive relation sigma of the foam concrete to obtain E epsilon, wherein sigma is the expansion stress of the foam concrete, E is the elastic modulus, and epsilon is the expansion strain.
Furthermore, the surface roughness of the pressure sensitive paint layer is less than 0.25 μm, and the thickness is between 30 and 60 μm.
Compared with the prior art, the invention has the following effects:
according to the application, the heat-conducting mould and the heating sheet are arranged, so that the heat curing of the foam concrete is realized; and an excitation light source and a CCD camera are arranged above the die, and the principle that the intensity of fluorescence excited by a photosensitive material irradiated by light waves with specific wavelengths is in direct proportion to the surface stress of the foam concrete is utilized, so that the expansion stress and deformation distribution of the foam concrete in a thermal curing environment can be continuously monitored in real time without moving a foam concrete test piece in the testing process, and the accuracy of a testing result is effectively improved.
The device is simple in structure, convenient to operate and accurate in test result.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and a device for testing expansion stress and deformation distribution of foam concrete comprises a mold 1, a heating plate 2, a rubber film 3, a transparent cover plate 4, an excitation light source 5, a temperature control box 9 and a PSP calibration system 11 installed in a computer, wherein the mold 1 is made of a metal material, the top of the mold is open, the heating plate 2 is installed at the bottom of the mold 1, a temperature sensor 10 is installed on the side surface of the mold 1, the heating plate 2 and the temperature control box 9, the temperature sensor 10 and the temperature control box 9, and the CCD camera 7 and the computer installed with the PSP calibration system 11 are respectively connected through wires, the foam concrete 100 is installed in the mold 1, the rubber film 3 is adhered to the upper surface of the foam concrete 100, a pressure-sensitive paint layer is sprayed on the upper surface of the rubber film 3, the transparent cover plate 4 is covered on the top of the mold 1, the excitation light source 5 and the CCD camera 7 are respectively and fixedly arranged above the mould 1, a first optical filter 12 is arranged between the excitation light source 5 and the pressure-sensitive coating layer, and a second optical filter 13 is arranged between the CCD camera 7 and the pressure-sensitive coating layer.
The photosensitive material is irradiated by light waves with specific wavelengths, the excited fluorescence intensity is in direct proportion to the surface stress of the foam concrete 100, and the device disclosed by the application utilizes the direct proportion relation to realize real-time monitoring on the expansion stress and deformation distribution of the foam concrete 100 generated by heating under different curing systems. The excitation light source 5 may be an ultraviolet light source directly. The excitation light source 5 is located right above or obliquely above the mold 1, as long as ultraviolet light can be uniformly irradiated on the upper surface of the foam concrete 100.
The device of this application is placed and is gone on in darkroom or dark surrounds, guarantees the normal clear of test.
The first filter 12 is an ultraviolet filter, the second filter 13 is a blue filter,
the ultraviolet filter can filter out redundant visible light and only allows ultraviolet light to pass through, so that the influence of the visible light on the pressure-sensitive coating layer is eliminated.
Transparent cover plate 4 can allow the ultraviolet ray to see through, and it can be ordinary glass material or organic glass material, preferably organic glass material. The pressure-sensitive paint layer can also be prevented from being scratched by the transparent cover plate 4.
The applicable temperature of the pressure sensitive coating layer is-20 to +60 ℃. The main components of the pressure-sensitive coating layer are pyrene derivative fluorescent probe molecules and polysiloxane matrix materials, the optimal excitation wavelength is 300-400 nm, and after excitation, blue fluorescence with the stable wavelength of 480nm is emitted. The blue filter between the CCD camera 7 and the pressure sensitive paint layer can effectively filter out redundant reflected exciting light and only allows blue fluorescence to pass through.
The exposure time of the CCD camera 7 is 3 ns-100 ns, and the resolution is 1600 pixels × 1200 pixels. The CCD camera 7 can receive light signals of 160-1300 nm and transmit captured real-time images to the PSP calibration system 11, so that the surface expansion stress and deformation distribution condition of the confined foam concrete 100 when heated are obtained.
The PSP is short for pressure sensitive paint, and the PSP calibration system is a pressure sensitive paint calibration system. The application of the method to the foam concrete can monitor the stress and deformation of any position of the whole surface.
The mold 1 can realize the function of conducting the heat of the heating plate 2 to the whole mold 1, thereby realizing the heat curing of the foam concrete 100 inside. The heating of the heating plate 2 is controlled by adjusting the set temperature of the temperature control box 9 to be 0-60 ℃, so that the thermal curing of the foam concrete 100 is realized, and the temperature in the mould 1 can be monitored by the temperature control box 9 in real time through the temperature sensor 10.
The light source support 6 and the camera support 8 are respectively used for ensuring the stability of the excitation light source 5 and the CCD camera 7 during working and adjusting the height, so that the angle formed by the excitation light source 5, the CCD camera 7 and the surface of the foam concrete 100 can be changed at 0-90 degrees. The light source support 6 and the camera support 8 can be telescopic rod structures with the height controlled through bolts, and when the height needs to be adjusted, the bolts can be manually loosened and tightened.
The lower surface of the rubber film 3 is rough and can be closely adhered to the upper surface of the foam concrete 100.
The application provides a technical means for mastering and controlling the volume expansion and cracking tendency of the foam concrete 100 under the steam-curing condition in the experimental research or actual production process by adopting the thermal curing.
The die 1 is of a cubic structure, cavities are machined in the side portion and the bottom portion of the die, the heating plate 2 is arranged in the cavity in the bottom portion, and the temperature sensor 10 is arranged in the cavity in the side portion. Due to the design, the heating plate 2 and the temperature sensor 10 are convenient to install, and the heating plate 2 and the temperature sensor 10 are not directly contacted with the foam concrete 100.
The number of the temperature sensors 10 is two, and the two temperature sensors are symmetrically arranged in cavities at two sides of the die 1. The temperature in the mold 1 can be monitored in real time more accurately.
The outside of the mould 1 is provided with a heat preservation and insulation layer. By the design, heat loss is effectively prevented.
The inner side wall of the mould 1 is provided with a polytetrafluoroethylene layer. By such design, the friction between the foam concrete 100 and the inner wall of the mold 1 is reduced.
The excitation light source 5 is fixed above the mould 1 through a light source support 6, and the CCD camera 7 is fixed above the mould 1 through a camera support 8.
The mold 1 is an iron mold.
The transparent cover plate 4 is an organic glass cover plate.
A method for testing the expansion stress and deformation distribution of the foam concrete by adopting the device comprises the following steps:
step one, pouring foam concrete 100 into a mould 1 until the height of the inner wall of the mould 1 is 1/2-2/3, vibrating to be dense, and then scraping the surface of the foam concrete 100;
step two, uniformly spraying pressure-sensitive paint on the upper surface of the rubber film 3, and polishing after the pressure-sensitive paint is cured to form a pressure-sensitive paint layer;
thirdly, placing the rubber film 3 on the upper surface of the foam concrete 100, and pressing the rubber film to be tightly adhered to the upper surface of the foam concrete 100;
step four, covering the transparent cover plate 4 on the top of the mold 1, opening the excitation light source 5 and the PSP calibration system 11, and adjusting the positions of the excitation light source 5 and the CCD camera 7, so that ultraviolet light generated by the excitation light source 5 can be uniformly irradiated on the upper surface of the foam concrete 100, and the CCD camera 7 can completely capture the image of the upper surface of the foam concrete 100;
fifthly, adjusting the exposure time of the CCD camera 7 until the CCD camera 7 can shoot a high-resolution image of the upper surface of the foam concrete 100; the resolution of the captured image is 1600 pixels by 1200 pixels.
Setting the target temperature of the temperature control box 9 to be 0-60 ℃, adjusting the shooting frequency of the CCD camera 7 to be 8-30 frames/second, and carrying out statistics on the fluorescence intensity of different positions of the upper surface image of the foam concrete 100 through post-processing software in the PSP calibration system 11 to obtain luminous intensity images in different stress states so as to obtain the surface expansion stress distribution of the restrained foam concrete 100 when being heated; the post-processing software is onereaafix 2, which can automatically obtain luminous intensity images under different expansion stress states.
And seventhly, deducing a corresponding deformation distribution according to the elastic modulus of the foam concrete 100 input in advance through the constitutive relation sigma of the foam concrete 100 to E epsilon, wherein sigma is the expansion stress of the foam concrete 100, E is the elastic modulus, and epsilon is the expansion strain. The expansion stress and deformation distribution of a plurality of restrained foam concrete 100 at different curing temperatures can be monitored in real time simultaneously by changing the target temperature of the temperature control box 9 and adjusting the angles and/or the number of the excitation light sources 5 and the CCD cameras 7.
The surface roughness of the pressure sensitive coating layer is less than 0.25 mu m, and the thickness of the pressure sensitive coating layer is between 30 and 60 mu m.
Claims (10)
1. The utility model provides a test foam concrete expansion stress and deformation distribution's device which characterized in that: it includes mould (1), heating plate (2), rubber film (3), clear cover board (4), excitation light source (5), temperature control box (9) and install PSP calbiration system (11) in the computer, mould (1) is the metal material, and heating plate (2) have been installed to its open-top setting, and temperature sensor (10) have been installed to the bottom of mould (1), and temperature sensor (10) have been installed to the side of mould (1), heating plate (2) with between temperature control box (9), between temperature sensor (10) and temperature control box (9) and between CCD camera (7) and the computer of installing PSP calbiration system (11) respectively through the wire connection, and foam concrete (100) are installed in mould (1), and rubber film (3) bond the upper surface at foam concrete (100), and the upper surface spraying of rubber film (3) has pressure sensitive paint layer, the transparent cover plate (4) is covered on the top of the mold (1), the excitation light source (5) and the CCD camera (7) are fixedly arranged above the mold (1) respectively, a first optical filter (12) is arranged between the excitation light source (5) and the pressure-sensitive coating layer, and a second optical filter (13) is arranged between the CCD camera (7) and the pressure-sensitive coating layer.
2. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 1, wherein: the die (1) is of a cubic structure, cavities are machined in the side portion and the bottom portion of the die, the heating plate (2) is arranged in the cavity in the bottom portion, and the temperature sensor (10) is arranged in the cavity in the side portion.
3. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 2, wherein: the number of the temperature sensors (10) is two, and the two temperature sensors are symmetrically arranged in cavities at two sides of the die (1).
4. An apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 1, 2 or 3, wherein: the outside of the mould (1) is provided with a heat preservation and insulation layer.
5. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 4, wherein: the inner side wall of the mould (1) is provided with a polytetrafluoroethylene layer.
6. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 1, 2, 3 or 5, wherein: an excitation light source (5) is fixedly arranged above the mould (1) through a light source support (6), and a CCD camera (7) is fixedly arranged above the mould (1) through a camera support (8).
7. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 1, 2, 3 or 5, wherein: the mould (1) is an iron mould.
8. The apparatus for testing the expansion stress and deformation distribution of foamed concrete according to claim 7, wherein: the transparent cover plate (4) is an organic glass cover plate.
9. A method for testing the expansion stress and deformation distribution of foam concrete by using the device of any one of claims 1 to 8, wherein the method comprises the following steps: it comprises the following steps:
pouring foam concrete (100) into the mold (1) until the height of the inner wall of the mold (1) is 1/2-2/3, vibrating to be dense, and then scraping the surface of the foam concrete (100);
step two, uniformly spraying pressure-sensitive paint on the upper surface of the rubber film (3), and polishing after the pressure-sensitive paint is cured to form a pressure-sensitive paint layer;
thirdly, placing the rubber film (3) on the upper surface of the foam concrete (100), and pressing the rubber film to be tightly adhered to the upper surface of the foam concrete (100);
step four, covering the transparent cover plate (4) on the top of the mold (1), opening the excitation light source (5) and the PSP calibration system (11), and adjusting the positions of the excitation light source (5) and the CCD camera (7) to enable ultraviolet light generated by the excitation light source (5) to be uniformly irradiated to the upper surface of the foam concrete (100), and enabling the CCD camera (7) to completely capture the image of the upper surface of the foam concrete (100);
fifthly, adjusting the exposure time of the CCD camera (7) until the CCD camera (7) can shoot a high-resolution image of the upper surface of the foam concrete (100);
setting the target temperature of the temperature control box (9) to be 0-60 ℃, adjusting the shooting frequency of a CCD camera (7) to be 8-30 frames/second, and carrying out statistics on the fluorescence intensity of different positions of the upper surface image of the foam concrete (100) through post-processing software in a PSP calibration system (11) to obtain luminous intensity images in different stress states so as to obtain the surface expansion stress distribution of the restrained foam concrete (100) when being heated;
and seventhly, deducing a corresponding deformation distribution according to the elastic modulus of the foam concrete (100) input in advance and through the constitutive relation sigma of the foam concrete (100) to E epsilon, wherein sigma is the expansion stress of the foam concrete (100), E is the elastic modulus, and epsilon is the expansion strain.
10. The method of claim 9, wherein: the surface roughness of the pressure sensitive coating layer is less than 0.25 mu m, and the thickness of the pressure sensitive coating layer is between 30 and 60 mu m.
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| CN201910973433.8A CN110646393B (en) | 2019-10-14 | 2019-10-14 | Device and method for testing expansion stress and deformation distribution of foam concrete |
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| CN201910973433.8A CN110646393B (en) | 2019-10-14 | 2019-10-14 | Device and method for testing expansion stress and deformation distribution of foam concrete |
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| CN110646393B CN110646393B (en) | 2022-03-22 |
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| CN111351602A (en) * | 2020-02-14 | 2020-06-30 | 广东省建筑科学研究院集团股份有限公司 | Method for measuring micro-expansion stress of cement-based material |
| CN112034135A (en) * | 2020-08-06 | 2020-12-04 | 中国科学院广州能源研究所 | Natural gas hydrate decomposes formation deformation measuring device |
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| CN112884751A (en) * | 2021-03-09 | 2021-06-01 | 清华大学 | Device and method for synchronously measuring deformation and temperature by using ultraviolet fluorescent mark |
| CN113155399A (en) * | 2021-04-06 | 2021-07-23 | 中国空气动力研究与发展中心高速空气动力研究所 | Synchronous measurement method for three-dimensional continuous distribution of surface pressure and deformation of high-speed aircraft |
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