CN114112858A - Core sample concrete impermeability grade rapid determination method - Google Patents
Core sample concrete impermeability grade rapid determination method Download PDFInfo
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- CN114112858A CN114112858A CN202111502964.2A CN202111502964A CN114112858A CN 114112858 A CN114112858 A CN 114112858A CN 202111502964 A CN202111502964 A CN 202111502964A CN 114112858 A CN114112858 A CN 114112858A
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- core
- pressurizing
- core sample
- base
- impermeability grade
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 239000000565 sealant Substances 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000011065 in-situ storage Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 238000009659 non-destructive testing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
The invention provides a method for rapidly determining core sample concrete impermeability grade. The technical scheme is that a core sample is loaded by a core barrel with matched shape, a locking base and a pressurizing base are respectively fixed at the top end and the bottom end of the core sample, and the core sample is sealed by a rubber gasket; on the basis, the pressure test device is connected to a pressurizing pump through a pressurizing base connecting pipeline and a pipeline with a pressure gauge and a valve, so that a pressurizing experiment is directly performed. The invention greatly simplifies the operation steps of the core sample concrete pressurization experiment, and ensures that the experiment process is simpler and more convenient, the detection speed is faster and the accuracy is higher. Practical application shows that the method can obviously shorten the test time, is convenient to prepare samples and easy to standardize, and has outstanding technical advantages and wide application prospect.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for rapidly determining the impermeability grade of core sample concrete.
Background
The concrete core-pulling sampling is mainly used for checking the quality of a concrete core of a cast-in-place pile, such as the cementing condition, the strength, the existence or nonexistence of pores, segregation or pile breakage and the like of the concrete core. The core-drawing sampling generally adopts diamond drilling, and the caliber is more than or equal to 76 mm. In-situ concrete structure strength measurement techniques (in-situ detection methods) are classified into non-destructive methods and partially destructive methods according to their degree of influence on the structure. The non-damage method has the advantages of no damage to the concrete structure, simple instrument and equipment, convenient operation, repeated test on the concrete structure, convenient large-range inspection and the like, and is popular among the engineering technicians. The nondestructive testing method mainly comprises a rebound method, an ultrasonic rebound synthesis method, a ray method, a maturity method and the like, wherein the nondestructive testing method taking a rebound apparatus and an ultrasonic apparatus as main instruments is most convenient to operate and most popular to use, has higher testing precision under the condition of an intensity measuring curve, and is a basic nondestructive testing technology acknowledged by the academic circles at home and abroad. On the other hand, the partial damage method is limited in that it is not suitable for a large-scale inspection because it causes partial damage to the concrete structure and is expensive. However, the partial breakage method represented by core sampling is not only directly reliable, but also is an indispensable effective method in many cases.
The impermeability grade is one of important indexes for evaluating the performance of concrete, and is determined by the maximum water pressure which can be born by a standard test piece with the age of 28d according to a standard test method. GB 50164 concrete quality control Standard according to the concrete test in the impervious test can bear the maximum water pressure, the impervious grade of concrete divided into P4, P6, P8, P10, P12, more than P12 grade, corresponding to the resistance to 0.4, 0.6, 0.8, 1.0 and 1.2MPa hydrostatic pressure without water seepage, in other words the concrete impervious test in a group of 6 test pieces in 4 test pieces when water seepage does not occur different maximum water pressure. The concrete with the impermeability grade being more than or equal to P6 is impermeable concrete. Although standardization has been achieved in grading methods, there are some differences in the measurement of different samples, especially for core concrete, the conventional measurement methods are cumbersome to operate and relatively low in accuracy.
Disclosure of Invention
The invention aims to provide a method for rapidly determining the impermeability grade of core sample concrete aiming at overcoming the technical defects in the prior art, and aims to solve the technical problems of complex operation and low accuracy in the conventional detection method for determining the impermeability grade of core sample concrete.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the method for rapidly determining the impermeability grade of core sample concrete comprises the following steps: grinding two ends of a core sample obtained in situ; screwing the locking base into the core barrel; coating the sealant on the periphery of the test piece, wherein the layer of sealant completely covers the side surface of the test piece, coating a layer of sealant after the layer of sealant is dried completely, putting the test piece into the core barrel, and then dripping the sealant on the periphery of the core sample; placing the test piece for 24h after loading, or placing the test piece into an oven for drying; screwing in the pressurizing base, and connecting the pressurizing pipeline and the pressure gauge; and starting a pressurizing pump, pressurizing to a water pressure corresponding to a preset impermeability grade, recording the permeation time, and calculating the impermeability grade.
Preferably, the height of the core sample is taken to be 100 mm.
Preferably, the screwing depth of the locking base into the core barrel is adjusted according to the length of the test piece.
Preferably, the sealant is Kafter anaerobic adhesive K-0262.
Preferably, the core barrel is made of stainless steel; the diameter of the core barrel is equal to that of the core barrel of the core drilling machine; the two ends of the core barrel are respectively provided with internal threads, one end of the core barrel is connected with the locking base, and the other end of the core barrel is connected with the pressurizing base.
Preferably, the locking base is provided with an external thread, and the wall thickness of the locking base is not less than 15 mm.
Preferably, one end of the pressurizing base is provided with an external thread which is in threaded connection with the core barrel, the other end of the pressurizing base is a closed bottom plate, a hole in the center of the bottom plate is connected with a pressurizing pipeline, and a pressure gauge and a valve are arranged on the pressurizing pipeline.
Preferably, a rubber gasket is provided between the base and the core.
The invention provides a method for rapidly determining core sample concrete impermeability grade. The technical scheme is that a core sample is loaded by a core barrel with matched shape, a locking base and a pressurizing base are respectively fixed at the top end and the bottom end of the core sample, and the core sample is sealed by a rubber gasket; on the basis, the pressure test device is connected to a pressurizing pump through a pressurizing base connecting pipeline and a pipeline with a pressure gauge and a valve, so that a pressurizing experiment is directly performed. The invention greatly simplifies the operation steps of the core sample concrete pressurization experiment, and ensures that the experiment process is simpler and more convenient, the detection speed is faster and the accuracy is higher. Practical application shows that the method can obviously shorten the test time, is convenient to prepare samples and easy to standardize, and has outstanding technical advantages and wide application prospect.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The method for rapidly determining the impermeability grade of core sample concrete comprises the following steps: grinding two ends of a core sample obtained in situ; screwing the locking base into the core barrel; coating the sealant on the periphery of the test piece, wherein the layer of sealant completely covers the side surface of the test piece, coating a layer of sealant after the layer of sealant is dried completely, putting the test piece into the core barrel, and then dripping the sealant on the periphery of the core sample; placing the test piece for 24h after loading, or placing the test piece into an oven for drying; screwing in the pressurizing base, and connecting the pressurizing pipeline and the pressure gauge; and starting a pressurizing pump, pressurizing to a water pressure corresponding to a preset impermeability grade, recording the permeation time, and calculating the impermeability grade.
Example 2
The method for rapidly determining the impermeability grade of core sample concrete comprises the following steps: grinding two ends of a core sample obtained in situ; screwing the locking base into the core barrel; coating the sealant on the periphery of the test piece, wherein the layer of sealant completely covers the side surface of the test piece, coating a layer of sealant after the layer of sealant is dried completely, putting the test piece into the core barrel, and then dripping the sealant on the periphery of the core sample; placing the test piece for 24h after loading, or placing the test piece into an oven for drying; screwing in the pressurizing base, and connecting the pressurizing pipeline and the pressure gauge; and starting a pressurizing pump, pressurizing to a water pressure corresponding to a preset impermeability grade, recording the permeation time, and calculating the impermeability grade. Wherein the height of the core sample is taken to be 100 mm. The screwing depth of the locking base into the core barrel is adjusted according to the length of the test piece. The sealant is Kafter anaerobic adhesive K-0262. The core barrel is made of stainless steel; the diameter of the core barrel is equal to that of the core barrel of the core drilling machine; the two ends of the core barrel are respectively provided with internal threads, one end of the core barrel is connected with the locking base, and the other end of the core barrel is connected with the pressurizing base. The locking base is provided with external threads, and the wall thickness of the locking base is not less than 15 mm. And one end of the pressurizing base is provided with an external thread and is in threaded connection with the core barrel, the other end of the pressurizing base adopts a closed bottom plate, a hole in the center of the bottom plate is connected with a pressurizing pipeline, and a pressure gauge and a valve are arranged on the pressurizing pipeline. A rubber gasket is provided between the base and the core.
Example 3
The method for rapidly determining the impermeability grade of core sample concrete comprises the following steps: grinding two ends of a core sample obtained in situ; screwing the locking base into the core barrel; coating the sealant on the periphery of the test piece, wherein the layer of sealant completely covers the side surface of the test piece, coating a layer of sealant after the layer of sealant is dried completely, putting the test piece into the core barrel, and then dripping the sealant on the periphery of the core sample; placing the test piece for 24h after loading, or placing the test piece into an oven for drying; screwing in the pressurizing base, and connecting the pressurizing pipeline and the pressure gauge; and starting a pressurizing pump, pressurizing to a water pressure corresponding to a preset impermeability grade, recording the permeation time, and calculating the impermeability grade. Wherein, the core barrel is made of stainless steel; the diameter of the core barrel is equal to that of the core barrel of the core drilling machine; the two ends of the core barrel are respectively provided with internal threads, one end of the core barrel is connected with the locking base, and the other end of the core barrel is connected with the pressurizing base. And one end of the pressurizing base is provided with an external thread and is in threaded connection with the core barrel, the other end of the pressurizing base adopts a closed bottom plate, a hole in the center of the bottom plate is connected with a pressurizing pipeline, and a pressure gauge and a valve are arranged on the pressurizing pipeline. A rubber gasket is provided between the base and the core.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The method for rapidly determining the impermeability grade of core sample concrete is characterized by comprising the following steps of: grinding two ends of a core sample obtained in situ; screwing the locking base into the core barrel; coating the sealant on the periphery of the test piece, wherein the layer of sealant completely covers the side surface of the test piece, coating a layer of sealant after the layer of sealant is dried completely, putting the test piece into the core barrel, and then dripping the sealant on the periphery of the core sample; placing the test piece for 24h after loading, or placing the test piece into an oven for drying; screwing in the pressurizing base, and connecting the pressurizing pipeline and the pressure gauge; and starting a pressurizing pump, pressurizing to a water pressure corresponding to a preset impermeability grade, recording the permeation time, and calculating the impermeability grade.
2. The method for rapidly determining the impermeability grade of core sample concrete according to claim 1, wherein the height of the core sample is 100 mm.
3. The method for rapidly determining the impermeability grade of core-sample concrete according to claim 1, wherein the screwing depth of the locking base into the core barrel is adjusted according to the length of the test piece.
4. The method for rapidly determining the impermeability grade of core-like concrete according to claim 1, wherein the sealant is Kafter anaerobic adhesive K-0262.
5. The method for rapidly determining the impermeability grade of core-like concrete according to claim 1, wherein the core cylinder is made of stainless steel; the diameter of the core barrel is equal to that of the core barrel of the core drilling machine; the two ends of the core barrel are respectively provided with internal threads, one end of the core barrel is connected with the locking base, and the other end of the core barrel is connected with the pressurizing base.
6. The method for rapidly determining the impermeability grade of core-sample concrete according to claim 1, wherein the locking base is provided with an external thread, and the wall thickness of the locking base is not less than 15 mm.
7. The method for rapidly determining the impermeability grade of core sample concrete according to claim 1, wherein the pressurizing base is provided with an external thread at one end for being connected with the core cylinder by a thread, and a closed bottom plate at the other end, the central opening of the bottom plate is connected with a pressurizing pipeline, and a pressure gauge and a valve are arranged on the pressurizing pipeline.
8. The method for rapidly determining the impermeability grade of core-like concrete according to claim 1, wherein a rubber gasket is provided between the base and the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111502964.2A CN114112858A (en) | 2021-12-10 | 2021-12-10 | Core sample concrete impermeability grade rapid determination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111502964.2A CN114112858A (en) | 2021-12-10 | 2021-12-10 | Core sample concrete impermeability grade rapid determination method |
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| Publication Number | Publication Date |
|---|---|
| CN114112858A true CN114112858A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111502964.2A Pending CN114112858A (en) | 2021-12-10 | 2021-12-10 | Core sample concrete impermeability grade rapid determination method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011080825A (en) * | 2009-10-06 | 2011-04-21 | West Nippon Expressway Co Ltd | Testing method for evaluating permeation resistance of surface impregnation material for concrete |
| CN103822864A (en) * | 2014-03-11 | 2014-05-28 | 山东省建筑科学研究院 | Testing method for water permeability resistance of concrete core sample |
| CN109540766A (en) * | 2019-01-14 | 2019-03-29 | 江西省水利科学研究院 | A kind of test method of concrete core sample relative permeability |
| CN113405873A (en) * | 2021-06-22 | 2021-09-17 | 江苏省建筑工程质量检测中心有限公司 | Sealing device for concrete entity impermeability test and impermeability test method |
-
2021
- 2021-12-10 CN CN202111502964.2A patent/CN114112858A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011080825A (en) * | 2009-10-06 | 2011-04-21 | West Nippon Expressway Co Ltd | Testing method for evaluating permeation resistance of surface impregnation material for concrete |
| CN103822864A (en) * | 2014-03-11 | 2014-05-28 | 山东省建筑科学研究院 | Testing method for water permeability resistance of concrete core sample |
| CN109540766A (en) * | 2019-01-14 | 2019-03-29 | 江西省水利科学研究院 | A kind of test method of concrete core sample relative permeability |
| CN113405873A (en) * | 2021-06-22 | 2021-09-17 | 江苏省建筑工程质量检测中心有限公司 | Sealing device for concrete entity impermeability test and impermeability test method |
Non-Patent Citations (1)
| Title |
|---|
| 朱成龙 等: "芯样混凝土抗渗等级快速测定装置及方法", 《采矿技术》, vol. 13, no. 1, pages 28 - 29 * |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20230505 Address after: No. 186, Zhongxin Road, High-tech Zone, Zibo City, Shandong Province, 255000 (in the yard of Zibo Mingzhu Materials Co., Ltd.) Applicant after: Shandong Tangzheng Testing Co.,Ltd. Address before: 255000 room 602, unit 2, building 11, Dongyun garden, century garden, Liantong Road, Zhangdian District, Zibo City, Shandong Province Applicant before: Sun Xiaohu |
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