CN108717038B - Concrete anti-gas permeability test device - Google Patents
Concrete anti-gas permeability test device Download PDFInfo
- Publication number
- CN108717038B CN108717038B CN201810502469.3A CN201810502469A CN108717038B CN 108717038 B CN108717038 B CN 108717038B CN 201810502469 A CN201810502469 A CN 201810502469A CN 108717038 B CN108717038 B CN 108717038B
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- air
- test piece
- concrete
- gas
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- 238000012360 testing method Methods 0.000 title claims abstract description 100
- 230000035699 permeability Effects 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000002775 capsule Substances 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
A device and a method for testing the gas permeation resistance of concrete. Relates to the field of concrete durability tests, in particular to a gas permeability test device and method for concrete. The concrete gas permeation resistance test device and method are simple in structure, convenient to process and capable of improving tightness and test reliability. Comprises a high-pressure gas cylinder, a gas permeation unit and a gas flowmeter; the gas permeation unit comprises a top plate, a bottom plate, a steel sleeve, a concrete test piece and an annular inflatable rubber capsule, wherein the steel sleeve is connected between the top plate and the bottom plate to form a test cavity, the concrete test piece and the inflatable rubber capsule are respectively positioned in the test cavity, and the concrete test piece and the PVC round pad are respectively positioned in the inflatable rubber capsule; the inside of the inflatable rubber capsule is provided with a test piece compensation mechanism, and the test piece compensation mechanism is used for wrapping a concrete test piece. According to the utility model, the test piece compensation mechanism is arranged, so that the sealing reliability of the concrete test piece is improved.
Description
Technical Field
The utility model relates to the field of concrete durability tests, in particular to a gas permeability test device and method for concrete.
Background
The durability degradation and the premature deterioration of the service performance of concrete materials are the most concerned problems in the current cement concrete science and engineering industries, and the gas permeability is an important index for representing the durability of concrete. At present, a pressure stabilizing method is used for testing the gas permeability of concrete, and mechanical sealing is usually adopted, and the method is found to have poor sealing effect in practice, and concrete test pieces are easy to damage, so that the reality and reliability of the concrete gas permeability coefficient experimental result are affected.
As shown in fig. 5, when the high-pressure gas cylinder inflates the inflatable rubber bag, the middle of the inflatable rubber bag is externally protruded, so that the concrete test piece is stressed more and is easy to damage; meanwhile, the two ends are concave inwards, so that the sealing reliability is reduced.
Disclosure of Invention
Aiming at the problems, the utility model provides the concrete gas permeation resistance test device and the method which have simple structure, are convenient to process and improve the tightness and the test reliability.
The technical scheme of the utility model is as follows: comprises a high-pressure gas cylinder, a gas permeation unit and a gas flowmeter; the gas permeation unit comprises a top plate, a bottom plate, a steel sleeve, a concrete test piece and an annular inflatable rubber capsule, wherein the steel sleeve is connected between the top plate and the bottom plate to form a test cavity, the concrete test piece and the inflatable rubber capsule are respectively positioned in the test cavity, a first PVC round pad plate is arranged between the concrete test piece and the top plate, a second PVC round pad plate is arranged between the concrete test piece and the bottom plate, and the first concrete test piece and the second PVC round pad plate are positioned in the inflatable rubber capsule;
the steel sleeve is provided with an air inlet communicated with the inflatable rubber air bag, the air inlet is communicated with the high-pressure air bottle through an air pipe,
the bottom plate and the second PVC round pad plate are provided with a permeation unit air inlet, the top plate and the first PVC round pad plate are provided with a permeation unit air outlet, the permeation unit air inlet is communicated with the high-pressure air bottle through an air pipe, and the permeation unit air outlet is communicated with the air flowmeter through the air pipe;
the inside of the inflatable rubber capsule is provided with a test piece compensation mechanism, and the test piece compensation mechanism is used for wrapping a concrete test piece.
The test piece compensation mechanism comprises an annular sleeve, an air passage is arranged in the sleeve, an annular air bag I communicated with the air passage is arranged on the outer side of the middle of the sleeve, an air hole communicated with the air passage is formed in the bottom plate, and the air hole is communicated with the high-pressure air bottle through an air pipe;
the sleeve is used for wrapping the concrete test piece and the first and second PVC round backing plates.
Annular air bags II are respectively arranged on the inner sides of two ends of the sleeve, annular caulking grooves are respectively formed in the first PVC round pad plate and the second PVC round pad plate, the air bags II are communicated with the air passage, and the air bags II are adaptively arranged in the caulking grooves.
The test piece compensation mechanism is as follows: the bottom surface of PVC round backing plate one is equipped with flexible fender ring one, the top surface of PVC round backing plate two is equipped with flexible fender ring two, flexible fender ring one and flexible fender ring two are frustum form, and the symmetry sets up, flexible fender ring two of flexible fender ring one contact for form sealed chamber between PVC round backing plate one and the PVC round backing plate two, the concrete sample is located sealed intracavity.
And a sealing ring is arranged between the end surfaces of the first flexible baffle ring and the second flexible baffle ring.
The test piece compensation mechanism comprises a cylinder, wherein the cylinder is used for wrapping a concrete test piece and a first round PVC backing plate and a second round PVC backing plate, an annular flexible bulge is arranged in the middle of the cylinder, and a spring is arranged in the flexible bulge.
In operation, a closed test cavity is formed by the top plate, the steel sleeve and the bottom plate, a concrete test piece is placed in the test cavity, a first PVC round pad and a second PVC round pad are respectively arranged on the upper part and the lower part of the concrete test piece, the concrete test piece is wrapped in an inflatable rubber bag, and firstly, the inflatable rubber bag is inflated through a high-pressure gas cylinder to realize sealing;
then, the high-pressure gas cylinder enters the gas action through the gas inlets of the permeation units on the bottom plate and the PVC round pad plate II, then exits through the gas outlets of the permeation units on the top plate and the PVC round pad plate I, and the gas is tested through a gas flowmeter;
through setting up test piece compensation mechanism, avoid destroying the concrete test piece, simultaneously, improve the leakproofness of test.
The concrete test piece is in a round cake shape, the upper part and the lower part are respectively provided with the first PVC round backing plate and the second PVC round backing plate, and the sealing reliability of the concrete test piece is improved by arranging the test piece compensation mechanism.
Drawings
Figure 1 is a diagram of the working state of the utility model,
figure 2 is a schematic diagram of a test piece compensation mechanism embodiment one,
figure 3 is a schematic diagram of a test piece compensating mechanism embodiment two,
figure 4 is a schematic diagram of a third embodiment of a test piece compensation mechanism,
FIG. 5 is a schematic diagram of a prior art structure;
in the figure 1 is a high-pressure gas cylinder,
2 is a gas permeation unit, 21 is a top plate, 22 is a bottom plate, 23 is a steel sleeve, 230 is an air inlet, 24 is a concrete test piece, 25 is an inflatable rubber bag, 26 is a PVC round pad plate I, 27 is a PVC round pad plate II, 28 is a permeation unit air inlet, 29 is a permeation unit air outlet,
and 3 is a gas flow meter,
4 is a test piece compensation mechanism,
41 is a sleeve, 411 is an air passage, 412 is an air bag I, 413 is an air hole, 414 is an air bag II, 415 is a caulking groove,
421 is the first flexible stop ring, 422 is the second flexible stop ring, 423 is the sealing ring,
43, 431 is a cylinder, 431 is a flexible protrusion, 432 is a spring,
5 is an air passage switch, 6 is a pressure reducing valve;
the arrow in fig. 5 represents the inflated state of the inflated rubber bag.
Detailed Description
The utility model is shown in figures 1-4, and comprises a high-pressure gas cylinder 1, a gas permeation unit 2 and a gas flowmeter 3; the gas permeation unit comprises a top plate 21, a bottom plate 22, a steel sleeve 23, a concrete test piece 24 and an annular inflatable rubber bag 25, wherein the steel sleeve is connected between the top plate and the bottom plate to form a test cavity;
the steel sleeve is provided with an air inlet 230 communicated with the inflatable rubber air bag, the air inlet is communicated with a high-pressure air bottle through an air pipe,
the bottom plate and the second PVC round pad plate are provided with a permeation unit air inlet 28, the top plate and the first PVC round pad plate are provided with a permeation unit air outlet 29, the permeation unit air inlet is communicated with a high-pressure air bottle through an air pipe, and the permeation unit air outlet is communicated with an air flowmeter through the air pipe; when the air pipe is in operation, the air passage switch 5 is arranged on the air pipe to facilitate the control of the opening and closing, and the pressure reducing valve 6 is arranged to facilitate the control of the air pressure.
The inside of the inflatable rubber capsule is provided with a test piece compensation mechanism 4, and the test piece compensation mechanism is used for wrapping a concrete test piece.
In operation, a closed test cavity is formed by the top plate, the steel sleeve and the bottom plate, a concrete test piece is placed in the test cavity, a first PVC round pad and a second PVC round pad are respectively arranged on the upper part and the lower part of the concrete test piece, the concrete test piece is wrapped in an inflatable rubber bag, and firstly, the inflatable rubber bag is inflated through a high-pressure gas cylinder to realize sealing;
then, the high-pressure gas cylinder enters the gas action through the gas inlets of the permeation units on the bottom plate and the PVC round pad plate II, then exits through the gas outlets of the permeation units on the top plate and the PVC round pad plate I, and the gas is tested through a gas flowmeter;
through setting up test piece compensation mechanism, avoid destroying the concrete test piece, simultaneously, improve the leakproofness of test.
The concrete test piece is in a round cake shape, the upper part and the lower part are respectively provided with the first PVC round backing plate and the second PVC round backing plate, and the sealing reliability of the concrete test piece is improved by arranging the test piece compensation mechanism.
The test piece compensation mechanism comprises an annular sleeve 41, an air passage 411 is arranged in the sleeve, an annular air bag I412 communicated with the air passage is arranged on the outer side of the middle of the sleeve, an air hole 413 communicated with the air passage is arranged on the bottom plate, and the air hole is communicated with a high-pressure air bottle through an air pipe;
the sleeve is used for wrapping the concrete test piece and the first and second PVC round backing plates.
Through the arrangement of the sleeve, the high-pressure gas cylinder inflates the first airbag on the sleeve, so that the first airbag acts on the middle of the inflatable rubber capsule, and the middle of the inflatable rubber capsule is concave, so that the damage to a concrete test piece is avoided; the two ends are outwards protruded, so that the PVC round pad plates I and II are reliably contacted through the sleeve, and the tightness is improved.
Annular air bags II 414 are respectively arranged on the inner sides of the two ends of the sleeve, annular caulking grooves 415 are respectively formed in the first PVC round cushion plate and the second PVC round cushion plate, the air bags II are communicated with an air passage, and the air bags II are adaptively arranged in the caulking grooves.
On one hand, the positioning is reliable by arranging the air bag II to be matched with the caulking groove; on the other hand, the tightness between the sleeve and the first and second PVC round backing plates is better, and the reliability of the concrete test piece test is ensured.
The test piece compensation mechanism is as follows: the bottom surface of PVC round backing plate one is equipped with flexible fender ring one 421, the top surface of PVC round backing plate two is equipped with flexible fender ring two 422, flexible fender ring one and flexible fender ring two all are frustum form, and the symmetry sets up, flexible fender ring two of flexible fender ring one contact for form sealed chamber between PVC round backing plate one and the PVC round backing plate two, the concrete test piece is located sealed intracavity.
The first flexible ring plate and the second flexible baffle ring have the same structure, and are contacted to form a sealing cavity, so that on one hand, the tightness is improved; on the other hand, after the inflatable rubber capsule is inflated, the inflatable rubber capsule is used for extruding the first flexible baffle ring and the second flexible baffle ring, so that a concrete test piece is prevented from being damaged, and meanwhile, the tightness of a sealing cavity is further guaranteed. The first flexible baffle ring and the second flexible baffle ring can be rubber rings, and are convenient to process.
A sealing ring 423 is arranged between the end surfaces of the first flexible baffle ring and the second flexible baffle ring.
By arranging the sealing ring, the tightness is ensured, and the reliability of the test is improved.
The test piece compensation mechanism comprises a cylinder 43, wherein the cylinder is used for wrapping a concrete test piece and a first round PVC backing plate and a second round PVC backing plate, an annular flexible bulge 431 is arranged in the middle of the cylinder, and a spring 432 is arranged in the flexible bulge.
In the work, after the inflatable rubber bag is inflated, the middle part of the inflatable rubber bag directly acts on the flexible bulge, so that the middle part of the inflatable rubber bag is concaved inwards through the spring, and the damage to a concrete test piece is avoided; the two ends are outwards protruded, so that the PVC round pad plates I and II are reliably contacted through the sleeve, and the tightness is improved. Flexible protrusions, such as rubber protrusions, may be used to place the springs.
The utility model is specifically divided into a test gas circuit system and a sealed gas circuit system, wherein a high-pressure gas cylinder is communicated with a gas inlet of a permeation unit through a gas pipe for gas inlet, passes through a concrete test piece, and then is discharged from a gas outlet of the permeation unit and is communicated with a gas flowmeter through the gas pipe; the pressure value of the air path system is precisely controlled through a precise pressure regulating valve (such as a pressure reducing valve 6), and gas in the test air path system permeates through the concrete test piece under certain pressure. The inflatable rubber air bag expands under certain gas pressure, and meanwhile, the inflatable rubber air bag is completely wrapped on a concrete test piece through the test piece compensation mechanism, so that the concrete test piece is prevented from being damaged, meanwhile, gas in a test gas path is prevented from overflowing from the side face, and further, an excellent sealing effect and a steady-state gas permeation process are achieved, and the authenticity and reliability of a test result are improved.
Claims (1)
1. A concrete anti-gas permeability test device comprises a high-pressure gas cylinder, a gas permeation unit and a gas flowmeter; the gas permeation unit is characterized by comprising a top plate, a bottom plate, a steel sleeve, a concrete test piece and an annular inflatable rubber bag, wherein the steel sleeve is connected between the top plate and the bottom plate to form a test cavity;
the steel sleeve is provided with an air inlet communicated with the inflatable rubber air bag, the air inlet is communicated with the high-pressure air bottle through an air pipe,
the bottom plate and the second PVC round pad plate are provided with a permeation unit air inlet, the top plate and the first PVC round pad plate are provided with a permeation unit air outlet, the permeation unit air inlet is communicated with the high-pressure air bottle through an air pipe, and the permeation unit air outlet is communicated with the air flowmeter through the air pipe;
the inner side of the inflatable rubber capsule is provided with a test piece compensation mechanism, and the test piece compensation mechanism is used for wrapping a concrete test piece;
the test piece compensation mechanism comprises an annular sleeve, an air passage is arranged in the sleeve, an annular air bag I communicated with the air passage is arranged on the outer side of the middle of the sleeve, an air hole communicated with the air passage is formed in the bottom plate, and the air hole is communicated with the high-pressure air bottle through an air pipe;
the sleeve is used for wrapping the concrete test piece and the first and second PVC round backing plates;
annular air bags II are respectively arranged on the inner sides of two ends of the sleeve, annular caulking grooves are respectively formed in the first PVC round pad plate and the second PVC round pad plate, the air bags II are communicated with the air passage, and the air bags II are adaptively arranged in the caulking grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502469.3A CN108717038B (en) | 2018-05-23 | 2018-05-23 | Concrete anti-gas permeability test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502469.3A CN108717038B (en) | 2018-05-23 | 2018-05-23 | Concrete anti-gas permeability test device |
Publications (2)
| Publication Number | Publication Date |
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| CN108717038A CN108717038A (en) | 2018-10-30 |
| CN108717038B true CN108717038B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810502469.3A Active CN108717038B (en) | 2018-05-23 | 2018-05-23 | Concrete anti-gas permeability test device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987760A (en) * | 2019-12-12 | 2020-04-10 | 中国建筑材料科学研究总院有限公司 | Method for detecting gas permeation resistance of material |
| CN111337379A (en) * | 2020-02-13 | 2020-06-26 | 中国海洋大学 | Ocean sediment gas permeability measuring device and using method thereof |
| CN111366522B (en) * | 2020-04-20 | 2020-10-30 | 苏交科集团股份有限公司 | Test collection system of concrete gas permeability data |
| CN111855527A (en) * | 2020-07-15 | 2020-10-30 | 西安理工大学 | Damaged concrete gas permeability detection device and method |
| CN113418832A (en) * | 2021-06-22 | 2021-09-21 | 敦煌研究院 | Moisture permeable cup with flexible wall sealing structure for geotechnical cultural relics and moisture permeability testing method |
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