CN113295484A - Method for manufacturing concrete test piece for simulating water-containing cavity defect - Google Patents
Method for manufacturing concrete test piece for simulating water-containing cavity defect Download PDFInfo
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- CN113295484A CN113295484A CN202110428904.4A CN202110428904A CN113295484A CN 113295484 A CN113295484 A CN 113295484A CN 202110428904 A CN202110428904 A CN 202110428904A CN 113295484 A CN113295484 A CN 113295484A
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000007547 defect Effects 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title abstract description 30
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 20
- 239000004568 cement Substances 0.000 claims description 15
- 239000003973 paint Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000007430 reference method Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 9
- 238000005498 polishing Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000007605 air drying Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for manufacturing a concrete test piece for simulating water-containing cavity defects, which comprises the following steps: the method comprises the following steps: pouring concrete containing defects; step two: pulling out the acrylic model; step three: demolding, curing and molding; step four: placing ice blocks and pouring concrete in a sealing way; step five: and maintaining the test piece to wait for the ice to be formed into water. The manufacturing process of the invention is relatively simple and can be prepared by using base materials; by a similar method, various water-containing defects with different shapes and sizes can be effectively simulated, and the condition that the tunnel lining contains cavities and water is accumulated can be more truly simulated; compared with the traditional sealed water injection and pressurizing test, the test piece saves the complicated processes of drilling and water injection and pressurizing, and the test piece is in a symmetrical stress state during the test, so that the test result is relatively more real; the method effectively solves the problem of simulating the defect of water content in the test piece, makes up the difficulty of manufacturing related test pieces, and provides a reference method for manufacturing test pieces similar to tests.
Description
Technical Field
The invention belongs to the technical field of concrete test pieces, and particularly relates to a method for manufacturing a concrete test piece for simulating a water-containing cavity defect.
Background
In many concrete projects, such as reservoir dams, tailing ponds, ash storage ponds of power plants, tunnels and the like, the main problem of catastrophe caused by project instability due to breakage and water seepage is that dynamic monitoring and catastrophe early warning are key points for ensuring normal operation of the projects and preventing and reducing disasters. In the building industry, nondestructive testing of concrete materials and structures is carried out by utilizing an infrared technology, which is an important field of application of an infrared thermal imaging technology, such as defect detection of bridges, nondestructive testing of concrete structures, water seepage detection of building structures and the like, and infrared dynamic monitoring of the whole process of concrete cracking and water seepage under a loaded condition is not reported. Because concrete is a similar material of rock, many traditional tests are in the form of drilling holes from two surfaces of a concrete test piece, and then water injection is carried out to simulate the water seepage situation in real concrete engineering or geotechnical engineering. The water leakage of the tunnel lining structure is simulated by the water injection-flowing water mode to be too single.
Disclosure of Invention
In order to overcome the problems, the invention provides a method for manufacturing a concrete test piece for simulating the defect of the water-containing cavity.
The technical scheme adopted by the invention is as follows:
a method for manufacturing a concrete test piece for simulating water-containing cavity defects comprises the following steps:
the method comprises the following steps: pouring concrete containing defects: manufacturing a concrete test piece into a cube of 150mm multiplied by 150mm according to the mixing proportion of C30 fine aggregate concrete, manufacturing a cylindrical hole with a cross section circular diameter of 50mm and a height of 100mm or a cylindrical hole with a cross section circular diameter of 30mm and a height of 100mm or a cuboid hole with a cross section square side length of 50mm and a height of 100mm or a cuboid hole with a cross section square side length of 30mm and a height of 100mm, wherein an included angle between the cuboid hole and the front face is 45 degrees; the total length of the selected acrylic rod is 150mm, the length of the part of the acrylic rod inserted into the concrete is 100mm, the other 50mm part is exposed outside so as to be convenient to extract, an acrylic cylinder or an acrylic cuboid is fixed on a mould in advance, and then the concrete is poured into the mould while being vibrated;
step two: plugging and pulling out the acrylic rod once every hour until the acrylic rod can be easily pulled out, and pulling out the acrylic model;
step three: demolding, maintaining and forming: maintaining after pouring is finished, and demolding after the test piece reaches the specified strength; after demolding, polishing the upper surface of the test piece by using a polishing machine to enable the test piece to be smooth and flat; after polishing the test piece, coating waterproof paint on the inner side of the hole, and mixing the waterproof paint and cement by a ratio of 1: 2, uniformly mixing and stirring the mixture according to the proportion, keeping the inner wall and the bottom of a hole of a test piece in a wet state, then coating the mixed waterproof coating, waiting for air drying of the test piece after coating, and coating the test piece for the second time after about 1 hour, wherein the second time is thicker than the first time, and the purpose of coating the waterproof coating is to ensure that a water-containing body in the concrete does not leak outwards before an experiment is carried out, so that the actual condition in a tunnel is simulated more truly;
step four: placing ice blocks and pouring concrete in a sealing way: placing ice blocks with corresponding specifications into the holes, and then carrying out sealed pouring of concrete, wherein the cement adopted by the sealed pouring of concrete is micro-expansion cement, the micro-expansion cement can effectively avoid micro cracks generated when the cement is solidified and contracted, the micro-expansion cement also has the characteristic of quick setting, the concrete can be ensured to reach a solidification state before the ice blocks are melted, and the heights of the ice blocks and the sealed pouring of concrete are both 50 mm;
step five: maintaining the test piece to be iced into water: after the ice blocks are sealed in the holes by the sealing pouring concrete, the ice blocks can be melted into water along with the lapse of time, and relevant detection experiment research is started.
The drawings illustrate the following:
FIG. 1 is a schematic view of step 1 of an embodiment 1 of a method for manufacturing a concrete sample for simulating a water-containing cavity defect according to the present invention;
FIG. 2 is a schematic view of step 2 of example 1 of a method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
FIG. 3 is a schematic view of step 3 of embodiment 1 of the method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
FIG. 4 is a schematic view of step 4 of embodiment 1 of the method for manufacturing a concrete specimen for simulating water-containing cavity defects according to the present invention;
FIG. 5 is a front cross-sectional view of step 4 of example 1 of a method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
FIG. 6 is a schematic view of step 1 of embodiment 2 of the method for manufacturing a concrete specimen for simulating water-containing cavity defects according to the present invention;
FIG. 7 is a schematic view of step 2 of embodiment 2 of a method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
FIG. 8 is a schematic view of step 3 in example 2 of a method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
FIG. 9 is a schematic view of step 4 of embodiment 2 of the method for manufacturing a concrete specimen for simulating a water-containing cavity defect according to the present invention;
fig. 10 is a front cross-sectional view of step 4 of example 2 of a method for manufacturing a concrete sample for simulating a water-containing void defect according to the present invention.
1. An acrylic cylinder; 2. a cylindrical bore; 3. an acrylic cuboid; 4. a rectangular parallelepiped hole; 5. hermetically pouring concrete; 6. ice cubes.
The invention has the following advantages:
1. the manufacturing process of the invention is relatively simple and can be prepared by using base materials;
2. by a similar method, various water-containing defects with different shapes and sizes can be effectively simulated, and the condition that the tunnel lining contains cavities and water is accumulated can be more truly simulated;
3. compared with the traditional sealed water injection and pressurizing test, the test piece saves the complicated processes of drilling and water injection and pressurizing, and the test piece is in a symmetrical stress state during the test, so that the test result is relatively more real;
4. the solid ice blocks have the characteristic of certain hardness, the volume of the cavity can be temporarily filled, the liquid water required by the test can be converted along with the increase of time and temperature, the upper part of the cavity can be plugged in time through the time that the solid ice blocks are not melted, the difficulty of simulating the defect of water content in the test piece is effectively solved, the difficulty of manufacturing related test pieces is made up, and a reference method is provided for manufacturing test pieces of similar tests.
Detailed Description
The present invention will be further described below, but the present invention is not limited to these.
Example 1
As shown in fig. 1 to 5, a method for manufacturing a concrete sample simulating a water-containing void defect includes the following steps:
the method comprises the following steps: pouring concrete containing defects: manufacturing a concrete sample into a cube of 150mm multiplied by 150mm according to the mixing proportion of C30 fine aggregate concrete, and manufacturing a cylindrical hole 2 with the cross section circular diameter of 50mm and the height of 100mm or a cylindrical hole 2 with the cross section circular diameter of 30mm and the height of 100 mm; the total length of the selected acrylic rod is 150mm, the length of the part of the acrylic rod inserted into the concrete is 100mm, and the other 50mm part is exposed outside so as to be convenient to extract, the acrylic cylinder 1 is fixed on a mould in advance, and then the concrete is poured into the mould while being vibrated;
step two: plugging and pulling out the acrylic rod once every hour until the acrylic rod can be easily pulled out, and pulling out the acrylic model;
step three: demolding, maintaining and forming: maintaining after pouring is finished, and demolding after the test piece reaches the specified strength; after demolding, polishing the upper surface of the test piece by using a polishing machine to enable the test piece to be smooth and flat; after polishing the test piece, coating waterproof paint on the inner side of the cylindrical hole 2, and mixing the waterproof paint with cement by the following steps of 1: 2, uniformly mixing and stirring, keeping the inner wall and the bottom of the cylindrical hole 2 of the test piece in a wet state, then coating the mixed waterproof coating, waiting for air drying of the test piece after coating, and coating for the second time after about 1 hour, wherein the second time is thicker than the first time;
step four: placing ice blocks and pouring concrete in a sealing way: placing an ice block 6 with a corresponding specification into the cylindrical hole 2, and then performing sealed pouring of concrete 5, wherein the cement adopted by the sealed pouring concrete 5 is micro-expansion cement, and the heights of the ice block 6 and the sealed pouring concrete 5 are both 50 mm;
step five: maintaining the test piece to be iced into water: after the ice blocks 6 are sealed in the cylindrical holes 2 by the sealing pouring concrete 5, the ice blocks 6 can be melted into water along with the time, and relevant detection experiment research is started.
Example 2
As shown in fig. 6 to 10, a method for manufacturing a concrete sample simulating a water-containing void defect includes the following steps:
the method comprises the following steps: pouring concrete containing defects: manufacturing a concrete sample into a cube of 150mm multiplied by 150mm according to the mixing proportion of C30 fine aggregate concrete, and manufacturing a rectangular hole 4 with the length of 50mm and the height of 100mm of a square with the cross section or a rectangular hole 4 with the length of 30mm and the height of 100mm of the square with the cross section, wherein the included angle between the rectangular hole 4 and the front face is 45 degrees; the total length of the selected acrylic rod is 150mm, the length of the part of the acrylic rod inserted into the concrete is 100mm, the other 50mm part is exposed outside so as to be convenient to extract, the acrylic cuboid 1 is fixed on a mould in advance, and then the concrete is poured into the mould while being vibrated;
step two: plugging and pulling out the acrylic rod once every hour until the acrylic rod can be easily pulled out, and pulling out the acrylic model;
step three: demolding, maintaining and forming: maintaining after pouring is finished, and demolding after the test piece reaches the specified strength; after demolding, polishing the upper surface of the test piece by using a polishing machine to enable the test piece to be smooth and flat; after polishing the test piece, coating waterproof paint on the inner side of the rectangular hole 4, and mixing the waterproof paint and cement by the following ratio of 1: 2, uniformly mixing and stirring, keeping the inner wall and the bottom of the cuboid hole 4 of the test piece in a wet state, then coating the mixed waterproof coating, waiting for air drying of the test piece after coating, and coating for the second time after about 1 hour, wherein the second time is thicker than the first time;
step four: placing ice blocks and pouring concrete in a sealing way: placing an ice block 6 with a corresponding specification into the cuboid hole 4, and then performing sealed pouring of concrete 5, wherein the cement adopted by the sealed pouring concrete 5 is micro-expansion cement, and the heights of the ice block 6 and the sealed pouring concrete 5 are both 50 mm;
step five: maintaining the test piece to be iced into water: after the ice blocks 6 are sealed in the cuboid holes 4 through the sealing pouring concrete 5, the ice blocks 6 can be melted into water along with the time, and relevant detection experiment research is started.
It is to be noted that, for a person skilled in the art, variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention.
Claims (3)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640086A (en) * | 2021-08-27 | 2021-11-12 | 中钢集团郑州金属制品研究院股份有限公司 | Manufacturing method of steel pipe concrete void detection test piece |
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