CN113310869A - Rapid determination device and test method for permeability coefficient of pervious concrete - Google Patents
Rapid determination device and test method for permeability coefficient of pervious concrete Download PDFInfo
- Publication number
- CN113310869A CN113310869A CN202110553478.7A CN202110553478A CN113310869A CN 113310869 A CN113310869 A CN 113310869A CN 202110553478 A CN202110553478 A CN 202110553478A CN 113310869 A CN113310869 A CN 113310869A
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- water
- pervious concrete
- test piece
- test
- permeability coefficient
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 28
- 230000035699 permeability Effects 0.000 title claims abstract description 25
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 7
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 239000004567 concrete Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 2
- 239000003566 sealing material Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 235000014121 butter Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
Images
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 discloses a rapid determination device and a rapid determination method for the permeability coefficient of pervious concrete. The side face of the test piece is evenly and tightly wrapped by the raw material belt in the test process, the test piece is placed in the main barrel, the water level is kept unchanged, the time required by quantitative water flowing out is shortened, and the water permeability coefficient is obtained through calculation. The test method greatly simplifies the test device and is easier to popularize; meanwhile, the raw material belt is used as a sealing material, so that the sealing operation can be facilitated, the compactness is ensured, the test device is simplified, the actual feasibility of the operation is improved, and certain economic and social benefits are achieved.
Description
Technical Field
The invention belongs to the technical field of pavement material performance detection, and particularly relates to a rapid determination device and a rapid determination method for a permeability coefficient of pervious concrete.
Background
The pervious concrete can effectively permeate surface rainwater in time as the name suggests, and the accumulation of the surface rainwater is reduced. In order to quantitatively measure the permeability coefficient of the pervious concrete, a test is required. According to the existing standard test method, the water permeability coefficient measuring device is relatively fixed, and is difficult to realize under the existing simple equipment assembly condition of a laboratory, so that the water permeability coefficient of the pervious concrete is difficult to measure in a short time when the requirement is met.
In the method for establishing the relationship between the porosity and the permeability coefficient of the permeable pavement material, plasticine, a raw material belt and liquid paraffin are used as sealing materials for sealing treatment in Song east and the like, the paraffin and the plasticine are used as the sealing materials, and the operation process is still inconvenient; the engineering permanent vibration and the like are provided in 'a test device and a test method for permeability coefficient of pervious concrete', wherein the test device comprises a bottom barrel, a metal pore plate arranged at the top of the low barrel, a test piece sleeve and a top barrel which are arranged on the metal pore plate, a water inlet groove connected to the side wall of the low barrel through a first conduit, a second conduit arranged on the side wall of the top barrel, and a measuring cylinder arranged at the water outlet of the second conduit; the water level needs to be adjusted according to different size test pieces in the test process, and the test device is relatively complex to manufacture and difficult to popularize and apply. Houxiale et al in "a pervious concrete coefficient of permeability detection device", through setting up the link, will detect a section of thick bamboo and basin inner wall fixed connection, set up the multirow flood peak simultaneously and carry out the control of water level and water yield, the device is not succinct enough, uses the subassembly more, is difficult to utilize existing condition to assemble.
The sealing operation to the test piece side in the test process is combined, certain operation difficulty is caused when sealing materials such as butter are selected, the butter and other materials are difficult to be evenly smeared on the test piece side, and the phenomenon that the butter and other materials are not adhered to the wall is difficult to be ensured when the test piece is placed in the device. Therefore, it is imperative to find a material which is easy to operate and which is favorable for reducing the influence of the test sealing material on the test piece, the cylinder wall and the like!
Disclosure of Invention
Aiming at the problem of practical operability in the determination process of the permeability coefficient of the pervious concrete, the invention develops a simpler test device, and uses polytetrafluoroethylene raw material belts to replace materials such as butter and the like as sealing materials, thereby forming an operation flow with higher sealing efficiency and better sealing effect, and the test device is easier to popularize. The technical problem to be solved by the invention is realized by adopting the following method:
the invention adopts the following technical scheme:
a rapid determination device for the permeability coefficient of pervious concrete comprises a main barrel, a water level control hole, a water outlet hole, a support, a drainage threaded hole and a support;
the water level control hole is located above the main barrel, the water outlet hole is located below the main barrel, the support is located at the bottom of the main barrel, the drainage threaded hole is located in the center of the bottom of the main barrel, and the support is located at the inner bottom of the main barrel and used for supporting a pervious concrete test piece.
The further technology of the invention is as follows:
preferably, the drainage threaded hole is spliced by bolts, and the spliced part is sealed by a polytetrafluoroethylene raw material tape.
Preferably, the side surface of the pervious concrete test piece is tightly wrapped by a polytetrafluoroethylene raw material belt, the side surface of the pervious concrete test piece is uniformly wrapped by the polytetrafluoroethylene raw material belt, and a gap between the pervious concrete and the main barrel of the test device is tightly filled.
The invention also provides a permeable concrete permeability coefficient test method, which comprises the following steps:
(1) soaking a pervious concrete test piece for later use according to the specification, uniformly wrapping a polytetrafluoroethylene raw material tape on the side surface of the test piece according to the requirement, and meeting the requirement of the thickness of a gap between the test piece and a main barrel;
(2) placing the test piece wrapped with the uniform raw material tape in the main barrel and on the bracket;
(3) closing the water outlet hole, sealing the water drainage threaded hole, injecting water into the barrel until the water fills the whole main barrel, submerging the whole test piece, and enabling the water surface to be flush with the water level control hole;
(4) opening the water outlet hole, simultaneously injecting quantitative water quantity Q, and keeping the water level unchanged;
(5) recording the permeation and discharge time t of the quantitative water;
(6) the water permeability coefficient k in the test is calculated by adopting the following formula:
wherein the height difference H between the water level control hole and the water outlet hole, the height L of the test piece and the diameter D are measured.
And the bolt is unscrewed through the sealed drainage thread hole, the test piece is taken out, the polytetrafluoroethylene tape is used for wrapping the bolt again to seal the drainage thread hole, and the test is carried out again.
The beneficial technical effects of the invention are as follows:
the polytetrafluoroethylene raw material tape is used as a sealing material, so that the side face of a test piece is favorably wrapped with the uniformity, the sliding of the sealing material is prevented, and meanwhile, the wrapping process is more convenient and the operation is favorably realized.
Adopt the test device that main bucket, water level control hole, apopore, support, drainage screw hole, support are constituteed, and the subassembly is comparatively common, and the device is simple, does benefit to promote and popularizes, can utilize current subassembly to carry out the coefficient of permeability survey under emergency.
The bolt can be unscrewed after the test by arranging the drainage thread hole, and the test piece is taken down, so that the test operation is facilitated, the test difficulty is reduced, and the method is more practical and feasible.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is the composition of the test apparatus;
wherein 1 is a main barrel; 2 is a water level control hole; 3 is a water outlet; 4 is a support; 5 is a drainage thread hole; and 6 is a bracket.
Detailed Description
For a better understanding of the present invention, its technical means, inventive features, effects and objects will now be further explained by reference to the embodiments and the accompanying drawings, which are only preferred embodiments of the present invention, but not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
As shown in fig. 1, a rapid determination device and a test method for permeability coefficient of pervious concrete, the device comprises a main barrel 1, a water level control hole 2, a water outlet hole 3, a support 4, a drainage threaded hole 5 and a support 6; the test sealing material adopts polytetrafluoroethylene raw material tape.
Example (b):
the main barrel 1 in the testing device can be selected by combining the size of a test piece and the existing conditions, the inner diameter of the main barrel in the embodiment is 106mm, the height difference between the water level control hole 2 and the water outlet hole 3 is 110mm, and the size of the test piece is a cylinder with the diameter of 100mm and the height of 50 mm.
The method for testing by adopting the testing device comprises the following steps: a
Placing the pervious concrete which is designed and molded according to a certain mixing proportion in a vacuum device, vacuumizing to 90 +/-1 kPa, keeping for 30min, adding enough water to cover the sample and enable the water level to be 100mm higher than the sample while keeping the vacuum, and soaking for 20 min.
The existing equipment is assembled and the bottom drainage thread hole 5 is sealed.
And taking out the soaked test piece, tightly and uniformly wrapping the side surface by using a polytetrafluoroethylene raw material belt to enable the diameter of the wrapped test piece to be slightly larger than the inner diameter of the main barrel, and loading the wrapped test piece into a water permeability coefficient device to be in close contact with the bracket.
And closing the water outlet, and simultaneously injecting airless water into the main barrel, so that the water level is positioned at the lower edge of the water level control hole and does not overflow.
Slowly injecting water into the main barrel, simultaneously opening the water outlet until the injected water amount is 1000ml, recording the time, measuring for 3 times, and taking an average value.
And opening the drainage threaded hole, withdrawing the test piece from the main barrel, and carrying out the next group of experiments.
The concrete test results of the permeable concrete test piece of this example are shown in table 1 below.
In the present invention, features are not necessarily present in isolation, but are interleaved with each other unless explicitly stated or limited. The foregoing shows and describes the principles, essential features, and advantages of the invention. Those skilled in the art should appreciate that the present invention is not limited to the above-described embodiments, and the above-described embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention to the only choice. The invention may be further modified and optimized within the spirit and scope of the appended claims, all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. The utility model provides a concrete permeability coefficient spot test device that permeates water which characterized in that: comprises a main barrel, a water level control hole, a water outlet hole, a support, a drainage thread hole and a bracket;
the water level control hole is located above the main barrel, the water outlet hole is located below the main barrel, the support is located at the bottom of the main barrel, the drainage threaded hole is located in the center of the bottom of the main barrel, and the support is located at the inner bottom of the main barrel and used for supporting a pervious concrete test piece.
2. The apparatus for rapidly measuring the permeability coefficient of pervious concrete according to claim 1, wherein: the drainage threaded hole is spliced by bolts, and the spliced position is sealed by a polytetrafluoroethylene raw material tape.
3. The apparatus for rapidly measuring the permeability coefficient of pervious concrete according to claim 1, wherein: the side surface of the pervious concrete test piece is tightly wrapped by a polytetrafluoroethylene raw material belt, the side surface of the pervious concrete is uniformly wrapped by the polytetrafluoroethylene raw material belt, and a gap between the pervious concrete and the main barrel of the test device is tightly filled.
4. The rapid determination device for the permeability coefficient of pervious concrete according to any one of claims 1 to 3, wherein the method for testing the permeability coefficient of pervious concrete by using the rapid determination device comprises the following steps:
(1) soaking a pervious concrete test piece for later use according to the specification, uniformly wrapping a polytetrafluoroethylene raw material tape on the side surface of the test piece according to the requirement, and meeting the requirement of the thickness of a gap between the test piece and a main barrel;
(2) placing the test piece wrapped with the uniform raw material tape in the main barrel and on the bracket;
(3) closing the water outlet hole, sealing the water drainage threaded hole, injecting water into the barrel until the water fills the whole main barrel, submerging the whole test piece, and enabling the water surface to be flush with the water level control hole;
(4) opening the water outlet hole, simultaneously injecting quantitative water quantity Q, and keeping the water level unchanged;
(5) recording the permeation and discharge time t of the quantitative water;
(6) the water permeability coefficient k in the test is calculated by adopting the following formula:
wherein the height difference H between the water level control hole and the water outlet hole, the height L of the test piece and the diameter D are measured.
5. The rapid determination device and the test method for the permeability coefficient of the pervious concrete according to claim 1 are characterized in that: and the bolt is unscrewed through the sealed drainage thread hole, the test piece is taken out, the polytetrafluoroethylene tape is used for wrapping the bolt again to seal the drainage thread hole, and the test is carried out again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553478.7A CN113310869A (en) | 2021-05-20 | 2021-05-20 | Rapid determination device and test method for permeability coefficient of pervious concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553478.7A CN113310869A (en) | 2021-05-20 | 2021-05-20 | Rapid determination device and test method for permeability coefficient of pervious concrete |
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| Publication Number | Publication Date |
|---|---|
| CN113310869A true CN113310869A (en) | 2021-08-27 |
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| CN202110553478.7A Pending CN113310869A (en) | 2021-05-20 | 2021-05-20 | Rapid determination device and test method for permeability coefficient of pervious concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324115A (en) * | 2022-01-06 | 2022-04-12 | 中建市政工程有限公司 | Rapid determination device and test method for permeability coefficient of pervious concrete |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183445A (en) * | 2011-03-07 | 2011-09-14 | 福建工程学院 | Instrument and method for testing permeability coefficient of water-permeable cement concrete |
| CN203894141U (en) * | 2014-04-30 | 2014-10-22 | 江苏建筑职业技术学院 | Permeation coefficient tester of permeable concrete standard cube test specimen |
| CN206339469U (en) * | 2016-12-20 | 2017-07-18 | 河海大学 | A kind of measure device of permeation coefficient of permeable concrete |
| CN109211752A (en) * | 2018-09-06 | 2019-01-15 | 中交武汉港湾工程设计研究院有限公司 | A kind of method of fast sealing concrete impervious test piece |
| CN109444017A (en) * | 2018-11-14 | 2019-03-08 | 扬州大学 | A kind of multi-functional pavement material device for testing permeability coefficient and its test method |
| CN110487699A (en) * | 2019-08-23 | 2019-11-22 | 淮阴工学院 | A kind of experimental rig and test method of pervious concrete infiltration coefficient |
-
2021
- 2021-05-20 CN CN202110553478.7A patent/CN113310869A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183445A (en) * | 2011-03-07 | 2011-09-14 | 福建工程学院 | Instrument and method for testing permeability coefficient of water-permeable cement concrete |
| CN203894141U (en) * | 2014-04-30 | 2014-10-22 | 江苏建筑职业技术学院 | Permeation coefficient tester of permeable concrete standard cube test specimen |
| CN206339469U (en) * | 2016-12-20 | 2017-07-18 | 河海大学 | A kind of measure device of permeation coefficient of permeable concrete |
| CN109211752A (en) * | 2018-09-06 | 2019-01-15 | 中交武汉港湾工程设计研究院有限公司 | A kind of method of fast sealing concrete impervious test piece |
| CN109444017A (en) * | 2018-11-14 | 2019-03-08 | 扬州大学 | A kind of multi-functional pavement material device for testing permeability coefficient and its test method |
| CN110487699A (en) * | 2019-08-23 | 2019-11-22 | 淮阴工学院 | A kind of experimental rig and test method of pervious concrete infiltration coefficient |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324115A (en) * | 2022-01-06 | 2022-04-12 | 中建市政工程有限公司 | Rapid determination device and test method for permeability coefficient of pervious concrete |
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Application publication date: 20210827 |