KR101453312B1 - Permeability Test Method and Apparatus for Self Healing Concrete - Google Patents
Permeability Test Method and Apparatus for Self Healing Concrete Download PDFInfo
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- KR101453312B1 KR101453312B1 KR1020140030189A KR20140030189A KR101453312B1 KR 101453312 B1 KR101453312 B1 KR 101453312B1 KR 1020140030189 A KR1020140030189 A KR 1020140030189A KR 20140030189 A KR20140030189 A KR 20140030189A KR 101453312 B1 KR101453312 B1 KR 101453312B1
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- self
- permeability
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- 230000035699 permeability Effects 0.000 title claims abstract description 91
- 239000004567 concrete Substances 0.000 title claims abstract description 82
- 230000035876 healing Effects 0.000 title claims abstract description 12
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 69
- 239000008400 supply water Substances 0.000 claims description 12
- 239000012466 permeate Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000002390 adhesive tape Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009715 pressure infiltration Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011041 water permeability test Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
-
- 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
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Dispersion Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a method for measuring the permeability of self-healing concrete in order to grasp the crack healing performance of self-healing concrete in which concrete cracks are self-healed, by minimizing disturbance due to the pressure of water by using natural pressure, A new form of self-healing concrete that can be used to test multiple specimens simultaneously under the same conditions while minimizing waste of water through a configuration that circulates the water used in the test to improve the reliability and accuracy of the measurement. A test method and a permeability testing apparatus.
Description
The present invention relates to a permeability testing method and a permeability testing apparatus for evaluating crack healing performance of self-healing concrete, and specifically, to objectively evaluate the crack healing performance of self-healing concrete in which cracks of concrete are self- Self-Healing Measures the permeability of concrete. By using natural pressure (natural pressure / natural pressure), disturbance due to water pressure is minimized to improve the reliability and accuracy of permeability measurement. The present invention relates to a new type of self-healing concrete permeability test apparatus and a permeability testing apparatus which are configured to minimize waste of water through a configuration for circulating used water and simultaneously test multiple specimens under the same conditions.
Cracks occurring in concrete structures may cause severe structural problems for concrete structures as well as deterioration of durability and appearance of concrete structures. Particularly, when the reinforcing bars laid on the concrete structure due to cracks are exposed to air or moisture, corrosion may occur, and moisture and air move to the inside of the concrete structure through the cracks, thereby accelerating the corrosion of the reinforcing bars. Concrete breakdown can be accelerated by expansion due to freezing.
In order to solve the problem caused by the occurrence of cracks in such concrete structures, recently, when cracks have occurred in the concrete, the cracks themselves are restored by the substances in the concrete without external artificial action, Self Healing Concrete "has attracted great interest.
In the case of ordinary concrete, if cracks occur in the concrete structure, the cracks can not be recovered unless artificially reinforced concrete reinforcement is applied. However, in the case of the self-healing concrete, even if cracks of a predetermined size occur in the concrete structure, Recovery performance. However, in general, cracks occurring in concrete structures made of self-healing concrete are microcracks having a width of 0.3 mm or less, and it is difficult to confirm whether self-healing of cracks is caused by naked eyes or other sensory evaluation.
On the other hand, "permeability of concrete" can be used as one of the indexes for evaluating the performance of such self-healing concrete because the permeability of the concrete structure changes when cracks are present. That is, the crack return performance of the self-healing concrete can be evaluated by analyzing whether or not leakage occurs through cracks after the occurrence of cracks. Thus, by measuring the permeability at the time of occurrence of cracks, As shown in FIG.
The conventional permeability test method for measuring the permeability of concrete structures is to measure the permeability of an undamaged concrete structure. The permeability of the concrete structure is evaluated by permeating water with artificial pressure applied to the concrete structure. An example of a conventional technique for measuring the permeability of a concrete structure using water permeation in a pressurized state is disclosed in Korean Patent Registration No. 10-0821212.
However, according to the conventional permeability test method for analyzing permeability by permeating moisture to a concrete structure under artificially high pressure, it can affect the basic performance of self-healing concrete. In order to grasp the crack healing performance of self-healing concrete, it is necessary to exclude an external force which may affect the initial crack generated in the concrete structure in the test process. In the conventional permeation test method, moisture permeates the concrete structure And this artificial pressurizing operation will eventually have unintended effects such as generating stress on the initial cracks in the concrete structure. Therefore, it is very difficult to grasp the permeability which can objectively and accurately evaluate the crack healing performance of the self-healing concrete by the conventional permeability testing method.
The present invention has been developed in order to overcome the problems and limitations of the prior art as described above, and it has been made possible to produce self-healing concrete by excluding external force, etc., which may affect initial cracks in a concrete structure such as pressurized water supply, The present invention provides a permeability testing method and a permeability testing apparatus that can objectively and accurately evaluate the crack healing performance of self-healing concrete by allowing a permeability test to be performed on a concrete structure subjected to a permeability test.
Specifically, in the present invention, in performing a permeability test using a specimen made of self-healing concrete, it is possible to exclude the action of an external force that disturbs the shape of the artificially formed crack in the specimen, The present invention aims to provide a permeability test method and a permeability test apparatus for a test piece of self-healing concrete which can perform a permeability test under the condition that the loss of water in the test process can be minimized.
In order to accomplish the above object, according to the present invention, there is provided a cylindrical member having a bottom opened, a cylindrical columnar specimen top end made of self-healing concrete is inserted into the lower portion, A discharge pipe connected to the hydraulic holding cylinder to supply a fluid into the hydraulic holding cylinder; a discharge pipe connected to the hydraulic holding cylinder at a position higher than the supply pipe to discharge the fluid contained in the hydraulic holding cylinder; And a passing flow measuring member positioned below the lower surface of the specimen to measure the amount of fluid passing through the specimen; The permeability of the self-healing concrete is tested by measuring the amount of fluid permeated through the specimen made of the self-healing concrete by the water filled in the hydraulic cylinder maintained at a constant water level. Device is provided.
Also, in order to achieve the above object, the present invention is to test the permeability of self-healing concrete using the permeability testing apparatus described above; Preparing a cylindrical specimen using self-healing concrete, and bisecting the cured specimen in a rubbed form; (For example, an adhesive tape) is placed on the divided surface of the bisected specimen so that a crack (crack) of 0.2 to 0.3 mm exists in the interval between the bisected specimens, and the bisected specimen Facing the specimen again, winding the specimen piece in a band-like binding groove so as to face the bisected specimen piece again so as to have a cylindrical shape; And two bisecting specimens facing each other, so that a water pressure holding cylinder is installed on the upper surface of the specimen prepared to have an artificial crack, and water is contained in the hydraulic pressure holding cylinder. In the lower part of the specimen, And measuring the amount of water that has passed through the test piece. The method for testing permeability of self-healing concrete is provided.
In the permeability testing apparatus and the permeability testing method of the present invention as described above, a pump capable of supplying water through a plurality of supply pipes and a distributor are provided so that a test can be performed on a plurality of specimens, A supply water tank is provided; The discharge pipe connected to the water pressure holding cylinder may communicate with the supply water tank to have a circulation configuration in which the water discharged from the water pressure holding cylinder is returned to the supply water tank.
In the permeate testing apparatus and the permeate testing method according to the present invention, the passing-through flow rate measuring member includes a funnel member having a shape in which the cross-sectional area becomes narrower as it goes down so that the fluid passing through the specimen does not disappear, And a collecting member which is located below the member and which collects the collected fluid and can measure the amount thereof.
In the permeator testing apparatus and the permeate testing method according to the present invention, the passing flow rate measuring member may include a water collecting member in which the fluid passing through the specimen collects, and a discharge pipe connected to the water collecting member, And a flow meter for measuring the flow rate when the collected fluid is discharged to the discharge pipe.
According to the permeability testing apparatus and the permeability testing method using the permeability testing apparatus according to the present invention, the fluid is stored in a hydraulic pressure holding cylinder provided at the upper end of a specimen made of self-healing concrete, Since the natural pressure is used, it is possible to exclude the action of an external force that disturbs the shape of the artificially formed crack in the specimen, thereby improving the accuracy and reliability of the test.
In addition, in the present invention, a permeability test can be performed on a plurality of specimens under the same conditions, and since water is circulated, the loss of water can be minimized in the test process, thereby preventing resource waste. do.
Particularly, according to the permeability testing apparatus according to the present invention and the permeability testing method using the permeability testing apparatus, it is possible to accurately measure a change in the permeability of the self-healing concrete over time, unlike the conventional permeability testing apparatus, It is possible to very effectively check and evaluate the performance of the system.
1 is a schematic perspective view showing a state where one embodiment of a permeability testing apparatus according to the present invention is coupled to a specimen made of self-healing concrete.
Fig. 2 is a schematic cross-sectional view along line AA of Fig.
Fig. 3 is a schematic view corresponding to Fig. 1 showing a state in which another embodiment of the permeability testing apparatus according to the present invention constructed to measure the amount of water passing through a specimen using a flow meter is coupled to a specimen made of self- .
4 is a schematic cross-sectional view along line BB in Fig.
5 is a schematic configuration diagram of a permeability testing apparatus according to the present invention having a configuration capable of simultaneously testing a plurality of specimens.
6 is a schematic perspective view showing that a plurality of permeate test sets are installed using a lathe in the permeability testing apparatus according to the present invention.
7 to 10 are photographs showing a process of manufacturing a self-healing concrete specimen in a state where an artificial crack is generated according to the permeability testing method according to the present invention.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.
FIG. 1 is a schematic perspective view showing a state in which an embodiment of the
As shown in the drawing, a
The water
A flow rate measuring member for measuring the amount of fluid passing through the
On the other hand, in the present invention, a flow meter may be used as a passing flow measuring member for measuring the amount of fluid passing through the
3 and 4, a
However, in the present invention, the passing flow rate measuring member for measuring the amount of fluid passing through the
In order to perform the permeability test on the
The
5 shows a schematic configuration diagram of a
In order to simultaneously test a plurality of
On the other hand, it is preferable that the
On the other hand, in order to simultaneously test a plurality of
5 and FIG. 6 illustrate the permeator testing device according to the embodiment shown in FIG. 1, but the permeate testing device according to the embodiment shown in FIG. 3 can also be configured as shown in FIG. 5 and FIG.
In the conventional permeability testing apparatus, water is permeated to a concrete structure under a pressure. In this case, there is a problem that unintentional influence is exerted, for example, stress is generated in a first crack occurring in a concrete structure. However, in the present invention, as described above, only the pressure due to the gravity acting on the fluid is used in penetrating the fluid into the
Hereinafter, the process of performing the permeability test on the self-healing concrete using the permeability testing apparatus of the present invention will be described in detail.
FIGS. 7 to 10 are photographs of a self-healing concrete specimen in a state in which an artificial crack is generated according to the permeability testing method according to the present invention. FIG. 7 is a photograph of a
In the permeability testing method according to the present invention, an artificial crack is formed in the
As described above, the water
As described above, in the permeability testing apparatus according to the present invention and the permeability testing method using the same, the fluid is stored in the hydraulic
In the present invention, the permeability test can be performed on the plurality of specimens under the same conditions. In the case where the fluid is circulated, the loss of the fluid in the test process can be minimized, .
The permeability test apparatus according to the present invention and the permeability test method using the permeability test apparatus according to the present invention can accurately measure the change in the permeability of the self-healing concrete with time, unlike the conventional permeability test apparatus, It is possible to very effectively check and evaluate the performance of the system.
10: Hydraulic holding cylinder
20: collecting member
200: The Psalms
202: artificial crack
Claims (6)
A supply pipe 11 connected to the hydraulic pressure holding cylinder 10 to supply fluid therein,
A discharge pipe (12) connected to the hydraulic pressure holding cylinder (10) at a position higher than the supply pipe (11) and discharging the fluid contained in the hydraulic pressure holding cylinder (10);
And a passing flow measuring member positioned below the lower surface of the specimen 200 to measure the amount of fluid passing through the specimen;
The permeability of the self-healing concrete is tested by measuring the amount of fluid that has permeated through the specimen 200 made of self-healing concrete with the fluid filled in the hydraulic pressure holding cylinder 10 maintained at a certain water level Self - healing concrete permeability testing device.
The passing flow rate measuring member
A funnel member 21 having a shape in which the cross-sectional area becomes narrower as the fluid passing through the specimen 200 does not disappear and goes down so as to be gathered; and a funnel member 21, which is located under the funnel member 21, And a collecting member (20) made up of a weighing and collecting tank (22) for making it possible to measure the permeability of the self - healing concrete.
The passing flow rate measuring member
A water collecting member 28 for collecting the fluid passing through the test piece 200 and a discharge pipe 280 connected to the water collecting member 28. The fluid collected in the water collecting member 28 through the test piece 200 is discharged through a discharge pipe 280 And a flow meter (281) for measuring a flow rate of the fluid discharged when the fluid is discharged to the outside.
A plurality of water pressure holding cylinders (not shown) are connected to each of the plurality of specimens 200, each of which has a supply water tank 42, a distributor 41 and a pump 43 so that a test can be performed on a plurality of specimens. The supply pipe 11 provided in the distributor 41 is connected to the distributor 41 and the fluid from the supply water tank 42 is supplied to the distributor 41 by the pump 43, To allow fluid to be supplied to the plurality of specimens 200;
The discharge pipe 12 connected to the hydraulic pressure holding cylinder 10 communicates with the supply water tank 42 so that the fluid contained in the hydraulic pressure holding cylinder 10 is returned to the supply water tank 42 And a permeability test device for measuring the permeability of the self-healing concrete.
Preparing a cylindrical specimen 200 by using self-healing concrete, curing the specimen 200, and bisecting the cured specimen 200 in a split form;
The crack spacing member is disposed on the divided surface of the bisected specimen 200 so that there is a crack in the interval between the bisected pieces of the specimen 200 when the bisected specimen 200 is joined face to face again , Placing the bisected specimen pieces face to face again and binding the specimen pieces 200 to the binding holes so that the bisected specimen pieces face each other to have a cylindrical shape; And
The water pressure holding cylinder 10 is installed on the upper surface of the specimen 200 prepared to have an artificial crack so that the water is held in the water pressure holding cylinder 10, 200), and measuring the amount of fluid that has passed through the specimen (200).
A plurality of specimens 200 facing each other and having an artificial crack are produced;
A supply pipe 11 provided in each of a plurality of hydraulic holding cylinders 10 connected to each of the manufactured plurality of specimens 200 is connected to a distributor 41 and a distributor 41 is connected to a pump 43, The pump 43 is connected to the supply water tank 42 so that the fluid contained in the supply water tank 42 is supplied to the distributor 41 by the pump 43 so that a plurality of specimens 200);
The discharge pipe 12 connected to the hydraulic pressure holding cylinder 10 is communicated with the supply water tank 42 so that the fluid contained in the hydraulic pressure holding cylinder 10 is returned to the supply water tank 42 Test method for permeability of self - healing concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140030189A KR101453312B1 (en) | 2014-03-14 | 2014-03-14 | Permeability Test Method and Apparatus for Self Healing Concrete |
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| KR1020140030189A KR101453312B1 (en) | 2014-03-14 | 2014-03-14 | Permeability Test Method and Apparatus for Self Healing Concrete |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237489A (en) * | 2014-09-29 | 2014-12-24 | 华南理工大学 | Method for measuring self-healing property of pipe pile concrete |
| CN105910976A (en) * | 2016-06-27 | 2016-08-31 | 西安交通大学 | Test device and method for evaluating micro-crack self-curing effect of bituminous mixture |
| CN106568698A (en) * | 2016-11-03 | 2017-04-19 | 天津大学 | Method for repairing concrete cracks by using microorganisms and conducting permeability test |
| KR101741137B1 (en) * | 2016-03-07 | 2017-05-29 | 한국건설생활환경시험연구원 | Test Method of Self-healing in Concrete Paste |
| CN107063963A (en) * | 2016-12-28 | 2017-08-18 | 浙江海洋大学 | A kind of compact reservoir microcrack extension and the test device and method of seepage flow characteristics |
| KR101783136B1 (en) | 2016-03-25 | 2017-09-28 | 성균관대학교산학협력단 | Water permeability device for self-healing performance evaluations of a cracking concrete |
| KR101796629B1 (en) * | 2016-01-15 | 2017-12-01 | 부산대학교 산학협력단 | Equipment to Evaluate Clogging and Containments Filtering Performance of Permeable Pavement-Soil Systems |
| CN108507929A (en) * | 2018-05-15 | 2018-09-07 | 江南大学 | The pervious concrete pervasion test device and its test method of level pressure gas-flow closure |
| CN108709824A (en) * | 2018-06-12 | 2018-10-26 | 中国二冶集团有限公司 | Self-compacting concrete bleeding rate test device and test method |
| CN109030350A (en) * | 2018-07-18 | 2018-12-18 | 四川三维节能建材有限公司 | A kind of detection method of the automatic wound healing concrete structure crack of water-repellent paint |
| CN109459365A (en) * | 2018-11-06 | 2019-03-12 | 河海大学 | A method of concrete permeability of the measurement under various working |
| KR20190028898A (en) | 2017-09-11 | 2019-03-20 | 가천대학교 산학협력단 | Method for evaluating durability recovery performance of self-healing concrete by measuring change of chloride ion concentration in solution |
| KR20190045598A (en) | 2017-10-24 | 2019-05-03 | 가천대학교 산학협력단 | Method for evaluating durability recovery performance of self-healing concrete by measuring change of chloride ion concentration using electric device |
| KR20190060075A (en) | 2017-11-24 | 2019-06-03 | 충남대학교산학협력단 | Bending Specimen for Producing Crack without Sudden Fracture, and Method for Producing Bending Crack in such Bending Specimen |
| KR20190066538A (en) | 2017-12-05 | 2019-06-13 | (재)한국건설생활환경시험연구원 | An inorganic self-healing binder capable of promoting the formation of needle-like self healing material and self-healing concrete using the same |
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| CN111551481A (en) * | 2020-06-08 | 2020-08-18 | 上海市建筑科学研究院有限公司 | Method for testing and characterizing cesium ion permeation resistance effect of concrete protective coating |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237489A (en) * | 2014-09-29 | 2014-12-24 | 华南理工大学 | Method for measuring self-healing property of pipe pile concrete |
| KR101796629B1 (en) * | 2016-01-15 | 2017-12-01 | 부산대학교 산학협력단 | Equipment to Evaluate Clogging and Containments Filtering Performance of Permeable Pavement-Soil Systems |
| KR101741137B1 (en) * | 2016-03-07 | 2017-05-29 | 한국건설생활환경시험연구원 | Test Method of Self-healing in Concrete Paste |
| KR101783136B1 (en) | 2016-03-25 | 2017-09-28 | 성균관대학교산학협력단 | Water permeability device for self-healing performance evaluations of a cracking concrete |
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