CN113295484B - 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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- CN113295484B CN113295484B CN202110428904.4A CN202110428904A CN113295484B CN 113295484 B CN113295484 B CN 113295484B CN 202110428904 A CN202110428904 A CN 202110428904A CN 113295484 B CN113295484 B CN 113295484B
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 230000007547 defect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 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 20
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 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 16
- 239000003973 paint Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000007605 air drying Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 238000005056 compaction Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000007430 reference method Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 239000011800 void material Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 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
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000001931 thermography Methods 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
- 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
-
- 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)
- Biochemistry (AREA)
- 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 a water-containing cavity defect, which comprises the following steps of: step one: pouring concrete containing defects; step two: pulling out an acrylic model; step three: demolding, curing and molding; step four: putting ice cubes and sealing and pouring concrete; step five: and (5) the maintenance test piece waits for icing into water. The invention has relatively simple manufacturing process and can be prepared by a basic material; by the similar method, various water-containing defects with different shapes and sizes can be effectively simulated, and the situation that the lining of the tunnel contains holes and water is more truly simulated; compared with the traditional sealed water injection and compaction test, the test piece omits the complicated processes of drilling and water injection and compaction, and the test piece is in a stress symmetrical state during the test, so that the test result is relatively more real; the method effectively solves the problem of water-containing defects in the simulation test piece, makes up the difficulty of manufacturing the related test piece, and provides a reference method for manufacturing the test piece similar to the test.
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
Many concrete projects, such as reservoir dams, tailing ponds, ash storage ponds of power plants, tunnels and the like, are broken and water seepage of which are main problems causing engineering instability and causing disaster, and dynamic monitoring and disaster early warning are key to ensuring normal operation of the projects and disaster prevention and reduction. In the construction industry, the nondestructive detection of concrete materials and structures by utilizing an infrared technology is an important field of application of an infrared thermal imaging technology, such as defect detection of bridges, nondestructive detection of concrete structures, water seepage detection of building structures and the like, and the infrared dynamic monitoring of the whole process of cracking and water seepage of concrete under the loaded condition is not reported yet. Because concrete is a similar material to rock, many conventional tests have been conducted by drilling holes from both sides of a concrete specimen, and then simulating the water seepage in real concrete or geotechnical works by water injection. 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 a water-containing cavity, which utilizes temporary hardness of ice cubes, adopts micro-expansion cement to prevent cement shrinkage from generating cracks, seals the concrete in the middle of the concrete, and simulates the defect of a real water-containing cavity.
The technical scheme adopted by the invention is as follows:
a method for manufacturing a concrete test piece for simulating a water-containing cavity defect comprises the following steps:
step one: pouring concrete containing defects: manufacturing a concrete test piece into a cube with the diameter of 150mm multiplied by 150mm according to the mixing ratio of C30 fine aggregate concrete, and manufacturing a cylindrical hole with the diameter of 50mm in cross section and the diameter of 100mm in height, a cylindrical hole with the diameter of 30mm in cross section and the diameter of 100mm in height, a cuboid hole with the side length of 50mm and the side length of 100mm in cross section or a cuboid hole with the side length of 30mm and the side length of 100mm in cross section, wherein the 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, and the other 50mm parts are exposed outside so as to facilitate extraction, an acrylic cylinder or an acrylic cuboid is fixed on a mould in advance, and then concrete is poured into the mould and vibrated;
step two: inserting and pulling an acrylic rod once every other hour until the acrylic rod can be easily pulled out, and pulling out an acrylic model;
step three: demolding, curing and molding: curing 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 polisher 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 with cement according to a proportion of 1:2, uniformly mixing and stirring the mixture in proportion, keeping the inner wall and the bottom of the hole of the test piece in a wet state, then coating the mixed waterproof paint, waiting for the air drying of the test piece after the coating is finished, and carrying out second coating for about 1 hour, wherein the second coating is thicker than the first coating, and the purpose of coating the waterproof paint is to ensure that the water in the concrete does not leak outwards before the experiment is carried out, so that the actual condition in the tunnel is simulated more truly;
step four: putting ice cubes and sealing and pouring concrete: placing ice cubes of corresponding specifications into the holes, and then sealing and pouring concrete, wherein the cement adopted by the sealing and pouring concrete is micro-expansion cement, so that micro-cracks generated when the cement is solidified and contracted can be effectively avoided, the micro-expansion cement also has the characteristic of quick solidification, the concrete can be ensured to reach a solidification state before the ice cubes are melted, and the heights of the ice cubes and the sealing and pouring concrete are 50mm;
step five: and (5) the maintenance test piece waits for icing into water: after the ice cubes are sealed in the holes by sealing pouring concrete, the ice cubes are melted into water along with the time, and related detection experimental research is started.
The drawings are as follows:
FIG. 1 is a schematic diagram of step 1 of an embodiment 1 of a method for manufacturing a concrete test piece for simulating a water-containing cavity defect according to the present invention;
FIG. 2 is a schematic diagram of step 2 of example 1 of a method for manufacturing a concrete test piece for simulating a water-containing void defect according to the present invention;
FIG. 3 is a schematic diagram of step 3 of example 1 of a method for manufacturing a concrete test piece for simulating a water-containing void defect according to the present invention;
FIG. 4 is a schematic diagram of step 4 of example 1 of a method for manufacturing a concrete test piece for simulating a water-containing void defect 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 test piece simulating a water-containing void defect according to the present invention;
FIG. 6 is a schematic diagram of step 1 of example 2 of a method for manufacturing a concrete test piece for simulating a water-containing void defect according to the present invention;
FIG. 7 is a schematic diagram of step 2 of example 2 of a method for manufacturing a concrete test piece simulating a water-containing void defect according to the present invention;
FIG. 8 is a schematic diagram of step 3 of example 2 of a method for manufacturing a concrete test piece simulating a water-containing void defect according to the present invention;
FIG. 9 is a schematic diagram of step 4 of example 2 of a method for manufacturing a concrete test piece simulating a water-containing void defect according to the present invention;
fig. 10 is a front sectional view of step 4 of example 2 of a method for manufacturing a concrete test piece for simulating a defect of a water-containing cavity according to the present invention.
1. An acrylic cylinder; 2. a cylindrical hole; 3. an acrylic cuboid; 4. a rectangular parallelepiped hole; 5. sealing and pouring concrete; 6. ice cubes.
The invention has the following advantages:
1. the invention has relatively simple manufacturing process and can be prepared by a basic material;
2. by the similar method, various water-containing defects with different shapes and sizes can be effectively simulated, and the situation that the lining of the tunnel contains holes and water is more truly simulated;
3. compared with the traditional sealed water injection and compaction test, the test piece omits the complicated processes of drilling and water injection and compaction, and the test piece is in a stress symmetrical 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 solid ice blocks can be converted into liquid water required by the test along with the increase of time and temperature, the upper part of the cavity can be plugged in time through the unmelted time of the solid ice blocks, the difficulty of simulating the problem of water-containing defects in the test piece is effectively solved, the difficulty of manufacturing related test pieces is overcome, and a reference method is provided for manufacturing test pieces similar to the test.
Detailed Description
The invention is further described below, but is not limited to these.
Example 1
As shown in fig. 1 to 5, a method for manufacturing a concrete test piece for simulating a water-containing cavity defect comprises the following steps:
step one: pouring concrete containing defects: manufacturing a concrete test piece into a cube with the cross section of 50mm, the height of 100mm and the circular diameter of 50mm or the circular diameter of 30mm, the height of 100mm according to the mixing ratio of C30 fine aggregate concrete; 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 parts are exposed outside so as to facilitate extraction, the acrylic cylinder 1 is fixed on a mould in advance, and then concrete is poured into the mould and vibrated;
step two: inserting and pulling an acrylic rod once every other hour until the acrylic rod can be easily pulled out, and pulling out an acrylic model;
step three: demolding, curing and molding: curing 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 polisher to enable the test piece to be smooth and flat; after finishing polishing the test piece, coating waterproof paint on the inner side of the cylindrical hole 2, and mixing the waterproof paint with cement according to a proportion of 1:2, uniformly mixing and stirring the materials in proportion, 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 paint, waiting for air drying of the test piece after the coating is finished, and carrying out second coating after about 1 hour, wherein the second coating is thicker than the first coating;
step four: putting ice cubes and sealing and pouring concrete: putting ice cubes 6 with corresponding specifications into the cylindrical hole 2, and then sealing and pouring concrete 5, wherein the cement adopted by the sealing and pouring concrete 5 is micro-expansion cement, and the heights of the ice cubes 6 and the sealing and pouring concrete 5 are 50mm;
step five: and (5) the maintenance test piece waits for icing into water: after the ice cubes 6 are sealed in the cylindrical holes 2 by the sealing poured concrete 5, the ice cubes 6 are melted into water with the lapse of time, and then the related detection experimental study is started.
Example 2
As shown in fig. 6 to 10, a method for manufacturing a concrete test piece simulating a water-containing cavity defect includes the following steps:
step one: pouring concrete containing defects: manufacturing a concrete test piece into a cube with the size of 150mm multiplied by 150mm according to the mixing ratio of C30 fine aggregate concrete, and manufacturing a cuboid hole 4 with the side length of 50mm and the height of 100mm or a cuboid hole 4 with the side length of 30mm and the height of 100mm and the side length of the square with the cross section, wherein the included angle between the cuboid hole 4 and the front surface 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, and the other 50mm parts are exposed outside so as to facilitate extraction, the acrylic cuboid 1 is fixed on a mould in advance, and then the concrete is poured into the mould and vibrated;
step two: inserting and pulling an acrylic rod once every other hour until the acrylic rod can be easily pulled out, and pulling out an acrylic model;
step three: demolding, curing and molding: curing 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 polisher to enable the test piece to be smooth and flat; after finishing polishing the test piece, coating waterproof paint on the inner side of the cuboid hole 4, and mixing the waterproof paint with cement according to a proportion of 1:2, uniformly mixing and stirring the materials in proportion, 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 paint, waiting for air drying of the test piece after the coating is finished, and carrying out second coating after about 1 hour, wherein the second coating is thicker than the first coating;
step four: putting ice cubes and sealing and pouring concrete: placing ice cubes 6 with corresponding specifications into the cuboid holes 4, and then sealing and pouring concrete 5, wherein the cement adopted by the sealing and pouring concrete 5 is micro-expansion cement, and the heights of the ice cubes 6 and the sealing and pouring concrete 5 are 50mm;
step five: and (5) the maintenance test piece waits for icing into water: after the ice cubes 6 are sealed in the rectangular solid holes 4 by the sealing poured concrete 5, the ice cubes 6 are melted into water with the lapse of time, and then the related test and experiment study is started.
It should be noted that it is possible for a person skilled in the art to make several variations and modifications without departing from the spirit of the invention, which are all within the scope of protection of the invention.
Claims (3)
1. A method for manufacturing a concrete test piece for simulating a water-containing cavity defect is characterized by comprising the following steps of: the method comprises the following steps:
step one: pouring concrete containing defects: manufacturing a concrete test piece into a cube with the diameter of 150mm multiplied by 150mm according to the mixing ratio of C30 fine aggregate concrete, and manufacturing a cylindrical hole (2) with the diameter of 50mm in cross section and the height of 100mm or a cylindrical hole (2) with the diameter of 30mm in cross section and the height of 100mm or a cuboid hole (4) with the side length of 50mm in cross section and the side length of 100mm or a cuboid hole (4) with the side length of 30mm in cross section and the side length of 100mm in square in cross section, wherein the included angle between the cuboid 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, and the other 50mm parts are exposed outside so as to facilitate extraction, an acrylic cylinder (1) or an acrylic cuboid (3) is fixed on a mould in advance, and then concrete is poured into the mould and vibrated;
step two: inserting and pulling an acrylic rod once every other hour until the acrylic rod can be easily pulled out, and pulling out an acrylic model;
step three: demolding, curing and molding: curing 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 polisher 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;
step four: putting ice cubes and sealing and pouring concrete: placing ice cubes (6) of corresponding specifications into the holes, and then sealing and pouring concrete (5);
step five: and (5) the maintenance test piece waits for icing into water: after the ice cubes (6) are sealed in the holes by the sealing pouring concrete (5), the ice cubes (6) are melted into water along with the time, and then the related detection experimental study is started.
2. The method for manufacturing the concrete test piece for simulating the defect of the water-containing cavity according to claim 1, wherein the method comprises the following steps of: the using method of the waterproof paint in the third step comprises the following steps: mixing the waterproof paint with cement according to the following ratio of 1:2, uniformly mixing and stirring the mixture in proportion, keeping the inner wall and the bottom of the hole of the test piece in a wet state, then smearing the mixed waterproof paint, waiting for the air drying of the test piece after the smearing is finished, and smearing for the second time after about 1 hour, wherein the second time is thicker than the first time.
3. The method for manufacturing the concrete test piece for simulating the defect of the water-containing cavity according to claim 1, wherein the method comprises the following steps of: in the fourth step, the cement adopted by the sealed pouring concrete (5) is micro-expansion cement, and the heights of the ice cubes (6) and the sealed pouring concrete (5) are 50mm.
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| CN113640086B (en) * | 2021-08-27 | 2023-12-29 | 中钢集团郑州金属制品研究院股份有限公司 | Manufacturing method of steel tube concrete void detection test piece |
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