CN209400386U - A kind of concrete sample saturation permeability coefficient test device - Google Patents
A kind of concrete sample saturation permeability coefficient test device Download PDFInfo
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- CN209400386U CN209400386U CN201822267006.1U CN201822267006U CN209400386U CN 209400386 U CN209400386 U CN 209400386U CN 201822267006 U CN201822267006 U CN 201822267006U CN 209400386 U CN209400386 U CN 209400386U
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Abstract
The utility model discloses a kind of concrete sample saturation permeability coefficient test devices, including pedestal, pedestal side is connect by the first valve with the first measurement pipe, the other side is connect by the second valve with the second measurement pipe, the hydraulically full water of chassis interior, its top is connect by bolt with the sample container for placing sample, sample periphery is cased with latex film, sample container side is equipped with ozzle, sample container top is connect by bolt with top cover, top cover upper end opening, side is connect by conduit with air compressor machine, third valve and pressure regulator valve are set between top cover and air compressor machine, the other side is connected by conduit with vacuum pump, 4th valve is set between top cover and vacuum pump.The utility model carries out concrete sample saturation by the way of negative pressure ventilation, and the micro-bubble in concrete pore can be discharged, and can not only accelerate test specimen saturation time and the infiltration coefficient for ensuring finally to be tested is saturation permeability coefficient.
Description
Technical field
The utility model category concrete permeability the field of test technology, in particular to a kind of concrete saturation permeability coefficient are surveyed
Trial assembly is set, the test correlative study of concrete material performance suitable for civil engineering.
Background technique
A kind of porous media material of the concrete as complexity, a Xiang Chong of the permeability as evaluation concrete durability
Want index.Especially for the concrete for hydraulic structure paddled throughout the year, when carrying out durability design, not only to consider that it is strong
Degree is impregnated to corrode by water and be influenced, and also to pay close attention to the reduction process of its permeance property.
It is numerous studies have shown that in order to test the permeable sandstone of concrete rule, can using water as permeating medium progress
Rapid osmotic test, and then establish and analyze infiltrative changing rule, a kind of index is provided for the durability Design of concrete.
Currently, 1. anti-penetration grade method can be divided into the method for concrete water permeability test；2. relative coefficient of permeability method；3. stationary flow
Dynamic method.
Anti-penetration grade method is to start to be to apply 0.2MPa hydraulic pressure from test specimen bottom when test, so by 6 test specimens of every group of setting
Hydraulic pressure 0.1MPa/ (8 hours) are increased by instrument automatically afterwards, in every group of set 6 test specimens, 4 test specimens therein are equal
It does not have water leakage, maximum hydraulic pressure at this moment is as the anti-penetration grade for calculating concrete.
Relative coefficient of permeability method is opposite to seep highly come the anti-permeability performance for evaluating concrete to measure infiltration under constant water pressure
Saturating Y-factor method Y is larger for the measurement error of high performance concrete compared with the concrete low suitable for permeability.
Steady flow method is a kind of more common method, first by test specimen peripheral sealing, applies hydraulic pressure to another from one side
It permeates on one side, the water percolating capacity passed through is measured after steady seepage, measure the rate flowed through by transformation pressure difference, tested number
Water permeability coefficient is calculated according to Darcy's law is brought into.The method is widely used since its principle is more reliable clear.But it passes
When the experimental rig of system carries out water penetration, packer permeability test directly is carried out from concrete one end, could not consider that inside concrete is smaller
Bubble in hole leads to the result for testing saturation permeability coefficient since the surface tension of itself film is not easy the problem of excluding completely
It is unstable.Therefore, there is an urgent need to one kind not only can be fully saturated by test specimen, but also quickly tests out the device of infiltration coefficient.
Utility model content
The purpose of the utility model is to provide a kind of concrete saturation permeability coefficient test devices, to fast implement concrete
Saturation permeability coefficient test, solve existing measuring technology to concrete sample dress sample, saturation and infiltration coefficient test process
In trivial operations problem.
To achieve the above object, the utility model provides the following technical solutions:
A kind of concrete saturation permeability coefficient test device, including pedestal, the pedestal side pass through the first valve and the
The connection of one measurement pipe, the other side are connect by the second valve with the second measurement pipe, the hydraulically full water of chassis interior, top
It being connect by bolt with the sample container for placing sample, the sample periphery is cased with latex film, and sample container side is equipped with ozzle,
The sample container top is connect by bolt with top cover, the top cover upper end opening, and side is connect by conduit with air compressor machine,
Third valve and pressure regulator valve are set between top cover and air compressor machine, and the other side is connected by conduit with vacuum pump, top cover and vacuum pump
Between be arranged the 4th valve.
Further, the cavity formed between connection latex film and sample container on the inside of the ozzle, outside separate type connect
Connect air-breathing ball.
Further, the latex film exceeds sample edge up and down, exceeds above the latex film and is partially disposed in top cover
Between sample container, exceeds below latex film and be partially disposed between sample container and pedestal.
Further, first measurement pipe, the second measurement pipe are all made of known diameter and mark graduated transparent glass
Material.
Further, the second measurement pipe diameter is the 1/2 of the first measurement pipe diameter.
Further, the sample container, sample, top cover, pedestal are cylindrical type.
Further, the sample upper end is 5cm at a distance from top cover lower end.
Further, the sample container and top cover use transparent high strength glass Steel material.
Compared with prior art, the utility model has the beneficial effects that
1, concrete sample saturation is carried out by the way of negative pressure ventilation, the micro-bubble in concrete pore can be arranged
Out, test specimen saturation time can not only be accelerated and the infiltration coefficient for ensuring finally to be tested is saturation permeability coefficient.
2, carry out concrete sample when being installed on sample container, first with air-breathing ball draw sample container and latex film it
Between air, facilitate and sample be placed in latex film, while enhancing the compactness of sample and latex film, so that sample side wall is more
Encryption envelope；
3, gas injection pressurization carries out two kinds of measurement pipe precision being provided, when sample material permeability in water permeability test process
When larger, the water for flowing through sample is larger, selects biggish first measurement pipe of caliber, when sample material permeability is smaller, stream
Water through sample is smaller, selects lesser second measurement pipe of caliber, can effectively improve the precision for reading seepage discharge data；
4, by controlling the size of air compressor machine pressure regulator valve, the saturation under multiple barometric gradients can be carried out to concrete sample
Gas permeability measurement increases the reliability of test result.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Description of symbols: 1- pedestal, the first valve of 2-, the first measurement pipe of 3-, the second valve of 4-, the second measurement pipe of 5-,
6- bolt, 7- sample, 8- sample container, 9- latex film, 10- ozzle, 11- top cover, 12- air compressor machine, 13- pressure regulator valve, 14- third
Valve, 15- vacuum pump, the 4th valve of 16-, 17- air-breathing ball.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " being provided with ", " be arranged/connect ", " connection " etc., shall be understood in a broad sense, such as " connection ", may be a fixed connection, can also be with
It is to be detachably connected, or be integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be with
Indirectly connected through an intermediary, it can be the connection inside two elements.For the ordinary skill in the art, may be used
The concrete meaning of above-mentioned term in the present invention is understood with concrete condition.
As shown in Figure 1, the concrete saturation permeability coefficient test device of the utility model, including pedestal 1, the pedestal 1 one
Side is connect by the first valve 2 with the first measurement pipe 3, and the other side is connect by the second valve 4 with the second measurement pipe 5, in pedestal 1
The hydraulically full water in portion, top are connect by bolt 6 with the sample container 8 for placing sample 7.7 periphery of sample is cased with latex film 9,
8 side of sample container is equipped with ozzle 10, and 8 top of sample container is connect by bolt 6 with top cover 11.
In addition, 11 upper end opening of top cover, side is connect by conduit with air compressor machine 12, is set between top cover 11 and air compressor machine 12
Pressure regulator valve 13 and third valve 14 are set, the other side is connected with vacuum pump 15 by conduit, is arranged between top cover 11 and vacuum pump 15
4th valve 16.
In preferred scheme, the cavity formed between latex film 9 and sample container 8, outside separation are connected on the inside of ozzle 10
Formula connects air-breathing ball 17.About 9 latex film exceeds 7 edge of sample, the latex film 9 above beyond be partially disposed in top cover 11 with
Between sample container 8, exceeds below latex film 9 and be partially disposed between sample container 8 and pedestal 1.First measurement pipe 3, second
Measurement pipe 5 is all made of known diameter and marks graduated transparent glass material.Second measurement pipe, 5 diameter is the first measurement pipe diameter
The 1/2 of 3.Sample container 8, sample 7, top cover 11, pedestal 1 are cylindrical type.7 upper end of sample is at a distance from 11 lower end of top cover
5cm.In addition, sample container 8 and top cover 11 use transparent high strength glass Steel material.
Specific operating method the following steps are included:
1) prepare test
A, sample is filled, first assembling whole device, sample container 8 and latex film 9 is extracted by ozzle 10 using air-breathing ball 17
Between air, by sample 7 place sample container 8 in, loose from air-breathing ball 17, sample 7 is tightly attached in latex film 9；
B, it is saturated, injects distilled water by the first 3 pipes of measurement, and open the first valve 2, then start vacuum pump 15 and open
7 headspace of sample is extracted vacuum by the 4th valve 16, and to occur droplet shape at the top of sample 7, saturation is completed, and closes the first valve
Door 2；
2) concrete saturated infiltration is tested
It is first turned on top cover 11, distilled water is poured into 7 top of sample, then the depth of water about 5cm passes through 6 top pressure closure of bolt,
Start air compressor machine 12 and third valve 14, pressure size is controlled by pressure regulator valve 13.The first valve 2 is opened, tentatively observes first
Water is advanced the speed in measurement pipe 3, is read water with the variable quantity of certain time, if liquid level rate of rise is smaller, is closed the
One valve 2 opens the second valve 4, and the variation for removing water percolating capacity Q t at any time is read by the second measurement pipe 5, formula is brought into and obtains coagulation
Native saturated infiltration.
In formula: Q indicates that water percolating capacity, t indicate time, A representing sample cross-sectional area.
3) saturation permeability coefficient solves
Value by changing pressure regulator valve 13 controls air-entry value size, repeats step 2, can be obtained and be saturated under the conditions of different pressures
Infiltration rate vi, bring formula into
Ki=vi×L/Pi
In formula: KiIndicate saturation permeability coefficient under i-th kind of air-entry value, viIndicate saturated infiltration under i-th kind of air-entry value, L
Representing sample height, PiIndicate i-th kind of air-entry value.
4) terminate test
Saturation permeability coefficient value K in comparison step 3 under various inlet valuei, due to the infiltration system of every kind of concrete material
Number should be a fixed value, if the saturation permeability coefficient calculated value departure degree under its every kind air-entry value takes it in 5% range
Average value thinks to meet test request, otherwise off-test restarts to test.
Although the utility model is described in detail with reference to the foregoing embodiments, come for those skilled in the art
Say, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic into
Row equivalent replacement, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all
It is included within the scope of protection of this utility model.
Claims (8)
1. a kind of concrete sample saturation permeability coefficient test device, it is characterised in that: including pedestal (1), the pedestal (1) one
Side is connect by the first valve (2) with the first measurement pipe (3), and the other side is connected by the second valve (4) and the second measurement pipe (5)
It connecing, the internal hydraulically full water of the pedestal (1), top is connect by bolt (6) with the sample container (8) for placing sample (7),
Sample (7) periphery is cased with latex film (9), and sample container (8) side is equipped with ozzle (10), sample container (8) top
It being connect by bolt (6) with top cover (11), top cover (11) upper end opening, side is connect by conduit with air compressor machine (12),
Third valve (14) and pressure regulator valve (13) are set between top cover (11) and air compressor machine (12), and the other side passes through conduit and vacuum pump
(15) it is connected, the 4th valve (16) is set between top cover (11) and vacuum pump (15).
2. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: the ozzle
(10) cavity formed between inside connection latex film (9) and sample container (8), outside separate type connect air-breathing ball (17).
3. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: the latex film
(9) exceed sample (7) edge up and down, the latex film (9) above beyond be partially disposed in top cover (11) and sample container (8) it
Between, exceed below latex film (9) and is partially disposed between sample container (8) and pedestal (1).
4. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: described first surveys
Buret (3), the second measurement pipe (5) are all made of known diameter and mark graduated transparent glass material.
5. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: described second surveys
Buret (5) diameter is the 1/2 of the first measurement pipe (3) diameter.
6. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: the sample holds
Device (8), sample (7), top cover (11), pedestal (1) are cylindrical type.
7. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: the sample
(7) upper end is 5cm at a distance from top cover (11) lower end.
8. concrete sample saturation permeability coefficient test device according to claim 1, it is characterised in that: the sample holds
Device (8) and top cover (11) use transparent high strength glass Steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822267006.1U CN209400386U (en) | 2018-12-29 | 2018-12-29 | A kind of concrete sample saturation permeability coefficient test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822267006.1U CN209400386U (en) | 2018-12-29 | 2018-12-29 | A kind of concrete sample saturation permeability coefficient test device |
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| CN209400386U true CN209400386U (en) | 2019-09-17 |
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| CN201822267006.1U Active CN209400386U (en) | 2018-12-29 | 2018-12-29 | A kind of concrete sample saturation permeability coefficient test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307683A (en) * | 2019-11-22 | 2020-06-19 | 浙江大学 | Self-balancing reinforced concrete structure impermeability test device and method |
| CN113686751A (en) * | 2021-08-24 | 2021-11-23 | 华南农业大学 | Method for testing permeability coefficient of pervious concrete |
| CN114923833A (en) * | 2022-06-01 | 2022-08-19 | 湖南大学 | High infiltration concrete osmotic coefficient's survey device |
-
2018
- 2018-12-29 CN CN201822267006.1U patent/CN209400386U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307683A (en) * | 2019-11-22 | 2020-06-19 | 浙江大学 | Self-balancing reinforced concrete structure impermeability test device and method |
| CN113686751A (en) * | 2021-08-24 | 2021-11-23 | 华南农业大学 | Method for testing permeability coefficient of pervious concrete |
| CN114923833A (en) * | 2022-06-01 | 2022-08-19 | 湖南大学 | High infiltration concrete osmotic coefficient's survey device |
| CN114923833B (en) * | 2022-06-01 | 2024-05-17 | 湖南大学 | High osmotic concrete osmotic coefficient's survey device |
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