CN109540766A - A kind of test method of concrete core sample relative permeability - Google Patents
A kind of test method of concrete core sample relative permeability Download PDFInfo
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- CN109540766A CN109540766A CN201910031869.5A CN201910031869A CN109540766A CN 109540766 A CN109540766 A CN 109540766A CN 201910031869 A CN201910031869 A CN 201910031869A CN 109540766 A CN109540766 A CN 109540766A
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- core sample
- test specimen
- test
- die trial
- concrete
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- 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
Abstract
The invention discloses a kind of test method of concrete core sample relative permeability, mainly include the following steps: physically to drill through one section of cylinder core sample in detected concrete；Core sample is placed in frustum die trial center；The gap between die trial and core sample is filled with grouting material；Demould into test specimen；It meets water end coating highly pervious modified epoxy waterproofing coating in the test specimen dried, moves into standard curing room and conserve 7 days；Test specimen side is sealed, then test specimen is pressed into die trial with helical accelerator；Test specimen is placed on the Anti-leakage instrument for being lined with ring-shaped rubber water stop spacer together with die trial and is tested, the phenolphthalein ethylalcohol that pressurized solution is 1%；Relative coefficient of permeability is calculated.Beneficial effects of the present invention; avoid test specimen and die trial or the grouting material loosely test failure caused by leak in conjunction with core sample; characterization infiltration height after the test that can also be more obvious, has the advantages that sealing effect is good, impermeability test is high-efficient, test data is accurate and reliable.
Description
Technical field
The present invention relates to hydraulic engineering technical field, in particular to a kind of test side of concrete core sample relative permeability
Method.
Background technique
Quality testing and evaluation to built hydraulic structures, can be according to SL352-2006 " concrete for hydraulic structure testing regulations "
Intensity test is carried out using coring and rebound method, and impervious (relative permeability) is the importance of hydraulic structures of paddling
Energy index, do not make clearly wanting to the method for inspection of mass concrete impermeability for national standard and professional standard at present
It asks.It, cannot be mating with Anti-leakage instrument, it is therefore desirable to be tried using frustum since the core sample that entity structure object is drilled through is cylindrical body
Core sample and binding material are fabricated to impervious test piece identical with standard sample size by mould.Due to test specimen and die trial or binding material
In conjunction with core sample loosely, easily lead to the position leak other than core sample and cause test failure, at the same need after the test by
Core sample is rived, its infiltration height is measured, and for calculating relative coefficient of permeability, but the washmarking position for the height that seeps water is often unobvious,
And then cause the accuracy and reliability of test data insufficient.
Summary of the invention
The object of the present invention is to provide a kind of test methods of concrete core sample relative permeability, and solving hydraulic engineering can not
Carry out the detection of solid concrete anti-permeability performance, can not intuitively characterize infiltration height and test specimen seals low success rate of technology and asks
Topic.
To achieve the above object, the present invention adopts the following technical scheme: a kind of test of concrete core sample relative permeability
Method, it is characterised in that include the following steps:
(1) one section of cylinder core sample is physically drilled through in detected concrete；
(2) core sample is placed in frustum die trial center；
(3) gap between die trial and core sample is filled with grouting material；
(4) after standing 24 hours, demoulding in second day becomes test specimen with the serous coat that wire brush brushes away core sample end face, dries examination
Part；
(5) it meets water end coating highly pervious modified epoxy waterproofing coating in the test specimen dried, stands, move back again within 48 hours
Enter standard curing room to conserve 7 days, dries test specimen later；
(6) sealing material is made with cement mixing butter, test specimen side is sealed, then with helical accelerator by test specimen
It is pressed into die trial；
(7) test specimen is placed on the Anti-leakage instrument for being lined with ring-shaped rubber water stop spacer together with die trial and is tested；
(8) Anti-leakage instrument water pressure is once added to 0.8MPa, constant pressure for 24 hours, the phenolphthalein ethylalcohol that pressurized solution is 1%；
(9) point ten equal parts after test specimen of riving measure a test specimen and redden position height, and according to SL352-2006, " concrete for hydraulic structure is tried
Test regulation " regulation, relative coefficient of permeability is calculated.
Further, the cylinder core sample is specifically the cylindrical body that diameter 100mm is drilled through on concrete solid, should
Concrete cylindrical body length >=200mm is cut into the core sample of high 150mm.
Further, the frustum die trial is the butt of back cut diameter 175mm, lower port diameter 185mm, high 150mm
Cone die trial.
Further, the special grouting material contains 6~8% swelling agent, 4~6% silicon powder and 0.5~0.7%
Cementing powder, admix in cement slurry, containing expanded constituents and improve interfacial adhesion ability ingredient, admix in cement slurry,
Its intensity, impermeability and the cementitiousness between core sample can significantly be improved, avoid in the prior art due to test specimen with
Die trial or the grouting material loosely test failure caused by leak in conjunction with core sample.
Further, the brushing highly pervious modified epoxy waterproofing coating, wherein brushing range is to decore outside sample end
The annular position of outer diameter 185mm, internal diameter 100mm, total dosage are 0.5-0.6kg/m2, change in the test specimen end coating Thief zone that meets water
Property epoxy waterproof coating, can prevent solution from other than core sample other positions ooze out, improve success of the test rate.
Further, the cement mixing butter is 3:1 by weight.
Further, the ring-shaped rubber water stop spacer is outer diameter 185mm, internal diameter 100mm, thickness 3mm, which can be with
It prevents solution from oozing out from other positions other than core sample, improves success of the test rate.
Further, the phenolphthalein ethylalcohol that pressurized solution is 1% in the step 8, the solution meet alkali and redden, can be intuitive
Reflection seep water height.
Compared with prior art the invention has the characteristics that and the utility model has the advantages that being brushed hypertonic by special grouting material
Saturating modified epoxy water-repellent paint and rubber water-proof gasket avoid in the prior art due to test specimen and die trial or grouting material and core
Sample combines test failure caused by loosely leak, while characterization that can also be more obvious by ethanolic phenolphthalein solution tests knot
Infiltration height after beam has the advantages that sealing effect is good, impermeability test is high-efficient, test data is accurate and reliable.Pass through this side
Method can really reflect the anti-permeability performance of solid concrete, and the detection and examination to entity structure amount of substance provide a set of science
Method.
Detailed description of the invention
Fig. 1 is the schematic diagram of step 1 of the present invention.
Fig. 2 is the schematic diagram of step 2 of the present invention.
Fig. 3 is the schematic diagram of step 3 of the present invention.
Fig. 4 is the schematic diagram of step 5 of the present invention.
Fig. 5 is the schematic diagram of step 7 of the present invention.
Appended drawing reference: 1- core sample, 2- frustum die trial, the special grouting material of 3-, 4- brush the modified ring of annular Thief zone
Oxygen water-repellent paint, 5- ring-shaped rubber water stop spacer.
Specific embodiment
To keep the purpose of the present invention, method and advantage clearer, the present invention is made below in conjunction with attached drawing further detailed
It describes in detail bright.
The embodiment of the present invention includes following steps:
1) cylindrical body of diameter 100mm is physically drilled through in detected concrete, the concrete cylindrical body length >=200mm,
It is cut into the core sample 1 of high 150mm, referring to Fig. 1；
2) core sample is placed in 2 center of frustum die trial of back cut diameter 175mm, lower port diameter 185mm, high 150mm, ginseng
See Fig. 2；
3) gap between die trial 2 and core sample 1 is filled with special grouting material 3, referring to Fig. 3；
4) after standing 24 hours, the serous coat of core sample end face is brushed away with wire brush；
5) it meets water end coating highly pervious modified epoxy waterproofing coating in the test specimen dried, the ratio provided according to manufacturer
Example is prepared.Brushing range be decore 1 end of sample outside outer diameter 185mm, internal diameter 100mm annular position 4, referring to fig. 4, total dosage
For 0.5-0.6kg/m2, it is then allowed to stand 48h, standard curing room is moved into and conserves 7 days；
It can carry out twice of brushing, first pass brushing dosage 0.25-0.3kg/m2, second time brushing is carried out after half an hour, is used
Amount is 0.25-0.3kg/m2。
6) after surface of test piece is dried, be mixed and made into sealing material with cement mixing butter 3:1 by weight, to test specimen side into
Row sealing, then test specimen is pressed into die trial with helical accelerator；
7) test specimen is placed in together with die trial is lined with outer diameter 185mm, internal diameter 100mm, thickness 3mm ring-shaped rubber water stop spacer 5
It is tested on Anti-leakage instrument, referring to Fig. 5；
8) Anti-leakage instrument water pressure is once added to 0.8MPa, constant pressure for 24 hours, the phenolphthalein ethylalcohol that pressurized solution is 1%；
9) point ten equal parts after test specimen of riving measure a test specimen and redden position height, and according to SL352-2006, " concrete for hydraulic structure is tried
Test regulation " regulation, relative coefficient of permeability is calculated.
Related experiment and result
Conventional method and the present embodiment the results are shown in Table 1.
1 conventional method of table and embodiment relative permeability test result
| Number | Test result |
| Conventional 1 | Occur between test specimen and die trial drainage 2 times, test is reformed |
| Conventional 2 | Leak 3 times around core sample, test is reformed |
| Embodiment | Do not occur drainage |
Table 1 the result shows that, special grouting material, brushing highly pervious modified epoxy waterproofing coating and rubber through the invention
Water stop spacer avoids the test caused by the loosely leak in conjunction with core sample with die trial or grouting material due to test specimen in the prior art
Failure, while by the infiltration height characterized after the test that ethanolic phenolphthalein solution can also be more obvious, there is sealing effect
The advantage that fruit is good, impermeability test is high-efficient, test data is accurate and reliable.It can really reflect solid concrete by the method
Anti-permeability performance, detection and examination to entity structure amount of substance provide the method for a set of science.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Any modification, equivalent replacement, improvement and so within principle, should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of test method of concrete core sample relative permeability, it is characterised in that include the following steps:
(1) one section of cylinder core sample is physically drilled through in detected concrete；
(2) core sample is placed in frustum die trial center；
(3) gap between die trial and core sample is filled with grouting material；
(4) after standing 24 hours, demoulding in second day becomes test specimen with the serous coat that wire brush brushes away core sample end face, dries test specimen；
(5) it meets water end coating highly pervious modified epoxy waterproofing coating in the test specimen dried, stands again, mark is moved into after 48 hours
Quasi- fog room conserves 7 days, dries test specimen later；
(6) sealing material is made with cement mixing butter, test specimen side is sealed, then be pressed into test specimen with helical accelerator
Die trial；
(7) test specimen is placed on the Anti-leakage instrument for being lined with ring-shaped rubber water stop spacer together with die trial and is tested；
(8) Anti-leakage instrument water pressure is once added to 0.8MPa, constant pressure for 24 hours, the phenolphthalein ethylalcohol that pressurized solution is 1%；
(9) point ten equal parts after test specimen of riving measure a test specimen and redden position height, and relative coefficient of permeability is calculated.
2. a kind of test method of concrete core sample relative permeability according to claim 1, it is characterised in that: described
Cylinder core sample is specifically that the cylindrical body of diameter 100mm is drilled through on concrete solid, and the concrete cylindrical body length >=
200mm is cut into the core sample of high 150mm.
3. a kind of test method of concrete core sample relative permeability according to claim 2, it is characterised in that: described section
Cone die trial is the frustum die trial of back cut diameter 175mm, lower port diameter 185mm, high 150mm.
4. a kind of test method of concrete core sample relative permeability according to claim 3, it is characterised in that: the spy
Grouting material processed contain 6~8% swelling agent, 4~6% silicon powder and 0.5~0.7% cementing powder, admix in cement slurry.
5. a kind of test method of concrete core sample relative permeability according to claim 5, it is characterised in that: the painting
Brush highly pervious modified epoxy waterproofing coating, wherein brushing range be decore sample end outside outer diameter 185mm, internal diameter 100mm ring
Shape position, total dosage are 0.5-0.6kg/m2。
6. a kind of test method of concrete core sample relative permeability according to claim 6, it is characterised in that: the water
Mud mixing butter is 3:1 by weight.
7. a kind of test method of concrete core sample relative permeability according to claim 7, it is characterised in that: the ring
Shape rubber water-proof gasket is outer diameter 185mm, internal diameter 100mm, thickness 3mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595648A (en) * | 2020-12-14 | 2021-04-02 | 广东省水利水电科学研究院 | Device and method for detecting seepage failure ratio degradation quality of core sample of plastic concrete wall |
| 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 |
| CN114112858A (en) * | 2021-12-10 | 2022-03-01 | 孙晓虎 | Core sample concrete impermeability grade rapid determination method |
| US20230194400A1 (en) * | 2021-12-17 | 2023-06-22 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595648A (en) * | 2020-12-14 | 2021-04-02 | 广东省水利水电科学研究院 | Device and method for detecting seepage failure ratio degradation quality of core sample of plastic concrete wall |
| 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 |
| CN114112858A (en) * | 2021-12-10 | 2022-03-01 | 孙晓虎 | Core sample concrete impermeability grade rapid determination method |
| US20230194400A1 (en) * | 2021-12-17 | 2023-06-22 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
| US11761864B2 (en) * | 2021-12-17 | 2023-09-19 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
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