CN111855527A - Damaged concrete gas permeability detection device and method - Google Patents
Damaged concrete gas permeability detection device and method Download PDFInfo
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- CN111855527A CN111855527A CN202010680625.2A CN202010680625A CN111855527A CN 111855527 A CN111855527 A CN 111855527A CN 202010680625 A CN202010680625 A CN 202010680625A CN 111855527 A CN111855527 A CN 111855527A
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- 239000004567 concrete Substances 0.000 title claims abstract description 148
- 230000035699 permeability Effects 0.000 title claims abstract description 77
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 102
- 238000012360 testing method Methods 0.000 claims abstract description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000741 silica gel Substances 0.000 claims description 12
- 229910002027 silica gel Inorganic materials 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000001309 chloro group Chemical class Cl* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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Abstract
The invention discloses a damaged concrete gas permeability detection device which comprises a nitrogen tank and a damaged concrete gas permeability detector, wherein the nitrogen tank and the damaged concrete gas permeability detector are connected through a first pressure-bearing hose, and the damaged concrete gas permeability detector is connected with a flowmeter through a pressure-bearing hose. The detection device solves the problem of gas permeability after the existing concrete is damaged, and can realize the detection of the gas permeability of the damaged concrete. The invention also provides a method for detecting the gas permeability of damaged concrete. Compared with the existing gas permeation method, the method can measure the air permeability of the damaged concrete, the required test piece is small, and the gas permeation performance of the damaged concrete in various ages and various strengths can be detected.
Description
Technical Field
The invention belongs to the technical field of concrete durability detection devices, and particularly relates to a damaged concrete gas permeability detection device and a damaged concrete gas permeability detection method.
Background
Impermeability as an important index for evaluating durability of concrete, test methods such as a water permeation method, a gas permeation method, and an ion permeation method have been produced. For realizing a concrete structure, when a water penetration method is used for testing, the secondary hydration action can change the internal structure of concrete, so that the measurement result is inaccurate, and the requirements on quality control and evaluation of high-performance concrete cannot be met; the ion permeation method is mainly used for detecting chlorine salt erosion, but a test piece needs to be soaked in a solution during testing, the test piece is also influenced by secondary hydration, and meanwhile, the real environmental characteristics of a concrete structure are difficult to simulate; the gas permeation method is used, the influence caused by hydration is overcome, the limitation of the environment is avoided, and the test can be finished by drilling and sampling at the concrete structure part. At present, the concrete gas permeation detection technology based on the Cemburea method and the air pressure difference method at home and abroad has the advantages of high detection precision, convenience in operation and the like.
In the prior art, the general detection method of the gas permeability of the concrete is nondestructive detection, namely, the concrete test piece is intact. However, in the long-term service process of concrete, cracks are generated on the surface and even inside of the concrete under the action of the external environment and the load, so that the concrete is damaged, and therefore, the method is not suitable for detecting the permeability of the damaged concrete any more, and a device suitable for detecting the permeability of the damaged concrete gas needs to be developed.
Disclosure of Invention
The invention aims to provide a damaged concrete gas permeability detection device, which solves the problem of gas permeability after the existing concrete is damaged and can realize the gas permeability detection of the damaged concrete.
Another object of the present invention is to provide a damaged concrete gas permeability detection method.
The invention adopts the technical scheme that the damaged concrete gas permeability detection device comprises a nitrogen tank and a damaged concrete gas permeability detector which are connected through a first pressure-bearing hose, wherein the damaged concrete gas permeability detector is connected with a flowmeter through the pressure-bearing hose.
The present invention is also characterized in that,
And a pressure reducing valve, a first stop valve and a barometer are sequentially arranged on the first pressure-bearing hose between the nitrogen tank and the damaged concrete gas permeability detector.
A second stop valve is arranged on a second pressure-bearing hose between the damaged concrete gas permeation detector and the flowmeter; and a flowmeter support frame is arranged below the second pressure-bearing hose and is used for supporting the flowmeter.
The flowmeter is a digital display gas flowmeter.
The damaged concrete gas permeation detector comprises an annular sleeve, wherein annular mounting plates are arranged at the top end edge and the bottom end edge of the annular sleeve; an upper cover is arranged above the annular sleeve, and the upper cover is connected with the mounting plate at the top end of the annular sleeve through a high-strength bolt; a lower cover is arranged below the annular sleeve and connected with a mounting plate at the bottom end of the annular sleeve through a high-strength bolt; the upper cover comprises a bottom plate, a cylindrical bump is arranged at the center of the bottom plate, the cylindrical bump is arranged towards the interior of the annular sleeve, the diameter of the cylindrical bump is the same as the inner diameter of the annular sleeve, and a cuboid groove is formed in one side, facing the interior of the annular sleeve, of the cylindrical bump; an upper cover quick connector is arranged at the center of the cylindrical bump, one end of the upper cover quick connector is connected with the second pressure-bearing hose, and the other end of the upper cover quick connector is communicated with the inside of the annular sleeve through a cuboid groove; the structure of the lower cover is the same as that of the upper cover, a cylindrical bump of the lower cover is installed towards the interior of the annular sleeve, a lower cover quick connector is arranged at the center of the cylindrical bump of the lower cover, one end of the lower cover quick connector is connected with the first pressure-bearing hose, and the other end of the lower cover quick connector is communicated with the interior of the annular sleeve through a cuboid groove; a supporting base is arranged below the lower cover, and the lower cover and the supporting base are welded together.
A rubber gasket is arranged between the lower cover and the mounting plate at the bottom end of the annular sleeve; a rubber gasket is arranged between the upper cover and the mounting plate at the top end of the annular sleeve.
The invention adopts the technical scheme that the detection method for the gas permeability of the damaged concrete adopts the detection device, and the specific determination steps are as follows:
step 2: putting the damaged concrete sample into a damaged concrete gas permeation detector, wherein the specific method comprises the following steps:
step 2.1: firstly, placing a silica gel pad above a lower cover;
step 2.2: then placing the damaged concrete sample on a silica gel pad;
step 2.3: connecting the mounting plate at the bottom end of the annular sleeve with the lower cover, placing a layer of rubber gasket between the mounting plate and the lower cover, and connecting the mounting plate and the lower cover by using a high-strength bolt;
step 2.4: coating epoxy resin glue between the damaged concrete test piece and the contact surface inside the annular sleeve, bonding the damaged concrete test piece and the inner wall of the annular sleeve, and placing a silica gel pad above the damaged concrete test piece;
Step 2.5: finally, connecting the mounting plate at the top end of the annular sleeve with the upper cover, placing a layer of rubber gasket between the mounting plate and the upper cover, and connecting the mounting plate and the upper cover by using a high-strength bolt;
and step 3: starting measurement, firstly opening a second stop valve and a first stop valve, then opening a barometer and a flowmeter, adjusting to zero, and finally opening a pressure reducing valve, wherein the air pressure is controlled within the range of 0.01-0.3 MPa;
and 4, step 4: when the numerical value in the flowmeter does not change any more along with the time, recording the measured flow at the moment, and calculating the gas permeability coefficient of the damaged concrete sample;
and 5: after the test is finished, the second stop valve and the first stop valve are closed, then the barometer and the flowmeter are closed, and the damaged concrete test piece in the annular sleeve is taken out after the air release is finished.
The present invention is also characterized in that,
in step 4, the gas permeability coefficient calculation formula for calculating the gas permeability coefficient of the damaged concrete test piece is as follows:
in the formula: k-permeability coefficient of damaged concrete specimen, m2；
QGo outOf the outlet endFlow rate, i.e. reading measured by the flowmeter, m3/s；
r-radius of the tested damaged concrete sample, m;
P2pressure at the outlet, atmospheric pressure, N/m2；
P1Pressure at the inlet end, i.e. measured by a barometer, N/m 2；
Mu-viscosity coefficient of gas, determined by ambient temperature at the time of detection, S.N/m2；
L is the thickness m of the tested damaged concrete sample;
and A, measuring the area of the damage position of the damaged concrete sample by CAD software, wherein the area is the average value of the front surface and the back surface of the damaged concrete sample.
The invention has the beneficial effects that:
(1) according to the damaged concrete gas permeability detection device, the existing gas permeability test device is improved, white latex is coated on the upper surface and the lower surface of a test piece to be measured, silica gel pads are attached to the upper surface and the lower surface of the test piece, the side wall of the test piece and a sleeve are sealed through epoxy resin glue, rubber gaskets are additionally arranged among the upper cover, the lower cover and an annular sleeve, the sealing effect between the test piece and the sleeve can be enhanced, and the measurement error caused by gas leakage of the side wall is reduced;
(2) the damaged concrete gas permeability detection device can obtain gas flow readings by changing the pressure difference condition and measuring for multiple times, further know the gas permeability condition of damaged concrete, calculate a gas permeability coefficient expression based on the deduced Darcy's law, quantitatively calculate the concrete permeability coefficient of the damaged concrete, and is simple and convenient;
(3) the gas permeability detection device for damaged concrete is simple and portable, and can be used for on-site core drilling sampling detection;
(4) Compared with the existing gas permeation method, the method for detecting the gas permeation performance of the damaged concrete can measure the gas permeation performance of the damaged concrete, the required test piece is small, and the gas permeation performance of the damaged concrete of various ages and various strengths can be detected.
Drawings
FIG. 1 is a schematic view showing the structure of a damaged concrete gas permeability detection apparatus according to the present invention;
FIG. 2 is a schematic diagram of a damaged concrete gas permeability detection apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of a damaged concrete gas permeability detector of the damaged concrete gas permeability detection apparatus according to the present invention;
FIG. 4 is a schematic diagram of a damaged concrete gas permeability detector test with a damaged concrete sample of the damaged concrete gas permeability detection apparatus of the present invention;
FIG. 5 is a top view of the upper or lower cover of the damaged concrete gas permeation detector of the detection apparatus of the present invention;
FIG. 6 is a schematic diagram illustrating the calculation of the damaged area of the damaged concrete specimen.
In the figure, 1, an upper cover quick connector, 2, a high-strength bolt, 3, an upper cover, 4, an annular sleeve, 5, a silica gel pad, 6, a damaged concrete sample, 7, a lower cover, 8, a lower cover quick connector, 9, a supporting base, 10, a nitrogen tank, 11, a pressure reducing valve, 12, a first stop valve, 13, a barometer, 14, a first pressure-bearing hose, 15, a flowmeter, 16, a flowmeter support frame, 17, a second stop valve, 18, a second pressure-bearing hose, 19, a cuboid groove, 20, a circular through hole, 21, a high-strength bolt hole and 22, damage cracks of the concrete sample.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a damaged concrete gas permeability detection device, which comprises a nitrogen tank 10 and a damaged concrete gas permeability detector, wherein the nitrogen tank 10 and the damaged concrete gas permeability detector are connected through a first pressure-bearing hose 14, and the damaged concrete gas permeability detector is connected with a flow meter 15 through a pressure-bearing hose 18.
A pressure reducing valve 11, a first stop valve 12 and a barometer 13 are sequentially arranged on a first pressure-bearing hose 14 between the nitrogen tank 10 and the damaged concrete gas permeation detector.
A second stop valve 17 is arranged on a second pressure-bearing hose 18 between the damaged concrete gas permeation detector and the flowmeter 15; a flow meter support frame 16 is also provided below the second pressure hose 18 for supporting the flow meter 15.
The flow meter 15 is a digital display gas flow meter.
The damaged concrete gas permeability detector comprises an annular sleeve 4, wherein annular mounting plates are arranged at the top end edge and the bottom end edge of the annular sleeve 4; an upper cover 3 is arranged above the annular sleeve 4, and the upper cover 3 is connected with a mounting plate at the top end of the annular sleeve 4 through a high-strength bolt 2; a lower cover 7 is arranged below the annular sleeve 4, and the lower cover 7 is connected with a mounting plate at the bottom end of the annular sleeve 4 through a high-strength bolt 2; the upper cover 3 comprises a bottom plate, a cylindrical bump is arranged at the center of the bottom plate, the cylindrical bump is arranged towards the inside of the annular sleeve 4, the diameter of the cylindrical bump is the same as the inner diameter of the annular sleeve 4, and a cuboid groove 19 is formed in one side of the cylindrical bump, which faces the inside of the annular sleeve 4; an upper cover quick connector 1 is arranged at the center of the cylindrical bump, one end of the upper cover quick connector 1 is connected with a second pressure-bearing hose 18, and the other end of the upper cover quick connector 1 is communicated with the inside of the annular sleeve 4 through a cuboid groove 19; the structure and the size of the lower cover 7 are the same as those of the upper cover 3, a cylindrical bump of the lower cover 7 is arranged towards the inside of the annular sleeve 4, a lower cover quick connector 8 is arranged at the center of the cylindrical bump of the lower cover 7, one end of the lower cover quick connector 8 is connected with a first pressure-bearing hose 14, and the other end of the lower cover quick connector 8 is communicated with the inside of the annular sleeve 4 through a cuboid groove 19; a supporting base 9 is arranged below the lower cover 7, and the lower cover 7 and the supporting base 9 are welded together.
A rubber gasket is arranged between the lower cover 7 and the mounting plate at the bottom end of the annular sleeve 4; a rubber gasket is arranged between the upper cover 3 and the mounting plate at the top end of the annular sleeve 4.
The diameter of the bottom plate of the upper cover 3 is 200mm, the thickness is 10mm, the diameter of the cylindrical bump is 100mm, the thickness is 30mm, and six high-strength bolt holes 21 (the diameter of the high-strength bolt holes is 12mm) are arranged at the position 75mm away from the center of the bottom plate.
The size of the rectangular parallelepiped groove 19 is 80X20X20mm (length X width X height), and a circular through hole 20 with a diameter of 10mm is arranged at the center of the lower cover 7 and the upper cover 3 for mounting the upper cover quick coupling 1 and the lower cover quick coupling 8, as shown in fig. 5.
The specification of the pressure-bearing hose is as follows
(1) A concrete test piece 6 to be detected to be damaged is placed on the lower cover 7, the side wall of the damaged concrete test piece 6 is sealed with the sleeve through epoxy resin glue, and rubber gaskets are additionally arranged among the upper cover 3, the lower cover 7 and the annular sleeve 4, so that the sealing effect between the damaged concrete test piece 6 and the annular sleeve 4 can be enhanced, and the measurement error caused by gas leakage of the side wall is reduced;
the test principle of the damaged concrete gas permeability detection device is as follows: the nitrogen tank 10 provides constant pressure for the damaged concrete gas permeation detector, the damaged concrete test piece 6 permeates under the action of constant air pressure, airflow passes through a crack and is collected in the second pressure-bearing hose 18, the flow meter 15 reads a stable flow index to achieve the purpose of test, and then the gas permeation coefficient is calculated through the gas permeation coefficient calculation formula provided by the invention.
In testing the invention, a concrete material with damaged cracks was selected, as shown in fig. 4.
The invention also provides a damaged concrete gas permeability detection method, which adopts the detection device and comprises the following specific measurement steps:
step 2: a damaged concrete test piece 6 (with the diameter of 100mm and the thickness of 50mm) is placed into a damaged concrete gas permeation detector, and the specific method is as follows:
step 2.1: firstly, placing a silica gel pad 5 above a lower cover 7;
step 2.2: then placing the damaged concrete sample 6 on the silica gel pad 5;
step 2.3: connecting the mounting plate at the bottom end of the annular sleeve 4 with the lower cover 7, placing a layer of rubber gasket between the mounting plate and the lower cover, and then connecting the mounting plate and the lower cover by using the high-strength bolt 2;
step 2.4: then coating epoxy resin glue between the damaged concrete test piece 6 and the contact surface inside the annular sleeve 4, bonding the damaged concrete test piece 6 and the inner wall of the annular sleeve 4, and placing a silica gel pad 5 above the damaged concrete test piece 6;
Step 2.5: finally, connecting the mounting plate at the top end of the annular sleeve 4 with the upper cover 3, placing a layer of rubber gasket between the mounting plate and the upper cover, and connecting the mounting plate and the upper cover by using a high-strength bolt 2;
and step 3: starting measurement, firstly opening the second stop valve 17 and the first stop valve 12, then opening the air pressure meter 13 and the flow meter 15 and adjusting to zero, and finally opening the reducing valve 11, wherein the air pressure is controlled within the range of 0.01-0.3 Mpa;
and 4, step 4: when the numerical value in the flowmeter 15 does not change any more with time, recording the measured flow at the moment, and calculating the gas permeability coefficient of the damaged concrete test piece 6;
and 5: after the test is finished, the second stop valve 17 and the first stop valve 12 are closed, then the air pressure gauge 13 and the flowmeter 15 are closed, and after the air release is finished, the damaged concrete test piece 6 in the annular sleeve 4 is taken out.
In the step 4, a gas permeability coefficient calculation formula adopted for calculating the gas permeability coefficient of the damaged concrete specimen 6 is a formula (2), and the formula is as follows:
firstly, a test piece is detected to be in a microcrack form after being damaged, and the formula derived from Darcy's law for calculating the gas permeability is as follows:
so damage concrete test piece 6 when detecting, the surface scribbles white latex, and damages concrete test piece 6 and all put the silica gel pad from top to bottom, and consequently gas seepage flow takes place in damage crackle department when detecting, and then the gas permeability coefficient computational formula is:
In the formula: k0Permeability coefficient, m, of a concrete specimen without damage to the surface by white latex2；
K-permeability coefficient, m, of damaged concrete specimen 62；
QGo outFlow at the outlet end, i.e. reading, m, measured by the flowmeter 153/s；
r-radius of the tested damaged concrete specimen 6, m;
P2pressure at the outlet, atmospheric pressure, N/m2；
P1Pressure at the inlet end, i.e. measured by a barometer 13, N/m2；
Mu-viscosity coefficient of gas, determined by ambient temperature at the time of detection, S.N/m2；
L is the thickness m of the tested damaged concrete specimen 6;
a is the area of the damage position of the detected damaged concrete sample 6, which is the average value of the front surface and the back surface of the damaged concrete sample 6 and is detected by CAD software, and is shown as the crack 22 of the damaged concrete sample in FIG. 6.
The invention relates to a damaged concrete gas permeability detection device, which has the following characteristics:
(1) can realize the detection of the gas permeability of the damaged concrete
The method can realize the detection of the gas permeability of the damaged concrete, evaluate the permeability of the concrete with damaged cracks and further evaluate the durability of concrete structural components.
(2) Small size of test piece, low manufacturing cost and simple test process
The gas permeability detection device for damaged concrete has the advantages of low cost when manufacturing a test piece, no limitation by age and maintenance conditions, and simple and easy test process.
(3) The measurement pressure gradient is low, and the secondary damage to the internal structure of the material is reduced
In the test process, the gas permeability detection device for damaged concrete only acts on nitrogen, has no interference of other external effects, and cannot damage the internal structure of the material.
Claims (8)
1. The utility model provides a damage concrete gas permeability detection device, its characterized in that, is including nitrogen gas jar (10) and damage concrete gas permeability detector of connecting through first pressure-bearing hose (14), and damage concrete gas permeability detector is connected with flowmeter (15) through pressure-bearing hose (18).
2. The damaged concrete gas permeability detection device according to claim 1, wherein a pressure reducing valve (11), a first stop valve (12) and a barometer (13) are sequentially arranged on a first pressure-bearing hose (14) between the nitrogen tank (10) and the damaged concrete gas permeability detection instrument.
3. A damaged concrete gas permeability detection apparatus according to claim 1, characterized in that a second stop valve (17) is provided on a second pressure-bearing hose (18) between the damaged concrete gas permeability detection apparatus and the flow meter (15); and a flowmeter support frame (16) is arranged below the second pressure-bearing hose (18) and is used for supporting the flowmeter (15).
4. A damaged concrete gas permeability detection apparatus according to claim 1, characterized in that the flow meter (15) is a digital display gas flow meter.
5. The damaged concrete gas permeability detection device according to claim 1, wherein the damaged concrete gas permeability detection device comprises an annular sleeve (4), and annular mounting plates are arranged at the top end edge and the bottom end edge of the annular sleeve (4); an upper cover (3) is arranged above the annular sleeve (4), and the upper cover (3) is connected with a mounting plate at the top end of the annular sleeve (4) through a high-strength bolt (2); a lower cover (7) is arranged below the annular sleeve (4), and the lower cover (7) is connected with a mounting plate at the bottom end of the annular sleeve (4) through a high-strength bolt (2); the upper cover (3) comprises a bottom plate, a cylindrical bump is arranged in the center of the bottom plate, the cylindrical bump is arranged towards the inside of the annular sleeve (4), the diameter of the cylindrical bump is the same as the inner diameter of the annular sleeve (4), and a cuboid groove (19) is formed in one side of the cylindrical bump, which faces the inside of the annular sleeve (4); an upper cover quick connector (1) is arranged at the center of the cylindrical bump, one end of the upper cover quick connector (1) is connected with a second pressure-bearing hose (18), and the other end of the upper cover quick connector (1) is communicated with the inside of the annular sleeve (4) through a cuboid groove (19); the structure of the lower cover (7) is the same as that of the upper cover (3), a cylindrical bump of the lower cover (7) is installed towards the inside of the annular sleeve (4), a lower cover quick connector (8) is arranged at the center of the cylindrical bump of the lower cover (7), one end of the lower cover quick connector (8) is connected with a first pressure-bearing hose (14), and the other end of the lower cover quick connector (8) is communicated with the inside of the annular sleeve (4) through a cuboid groove (19); a supporting base (9) is arranged below the lower cover (7), and the lower cover (7) and the supporting base (9) are welded together.
6. A damaged concrete gas permeability detection apparatus according to claim 5, characterized in that a rubber gasket is provided between the lower cover (7) and the mounting plate at the bottom end of the annulus (4); and a rubber gasket is arranged between the upper cover (3) and the mounting plate at the top end of the annular sleeve (4).
7. A method for detecting gas permeability of damaged concrete by using the detection device of any one of claims 1 to 6, which is characterized by comprising the following specific steps:
step 1, before gas permeability measurement, preprocessing a damaged concrete test piece (6), specifically: coating white latex on the surface of the damaged concrete test piece (6), drying the damaged concrete test piece (6) at 50 ℃ for 12-24 hours, and cooling to room temperature;
step 2: putting the damaged concrete test piece (6) into a damaged concrete gas permeation detector, wherein the specific method comprises the following steps:
step 2.1: firstly, a silica gel pad (5) is placed above a lower cover (7);
step 2.2: then placing the damaged concrete test piece (6) on the silica gel pad (5);
step 2.3: connecting the mounting plate at the bottom end of the annular sleeve (4) with the lower cover (7), placing a layer of rubber gasket between the mounting plate and the lower cover, and then connecting the mounting plate and the lower cover by using the high-strength bolt (2);
Step 2.4: then coating epoxy resin glue between the damaged concrete test piece (6) and the contact surface inside the annular sleeve (4), bonding the damaged concrete test piece (6) and the inner wall of the annular sleeve (4), and placing a silica gel pad (5) above the damaged concrete test piece (6);
step 2.5: finally, connecting the mounting plate at the top end of the annular sleeve (4) with the upper cover (3), placing a layer of rubber gasket between the mounting plate and the upper cover, and connecting the mounting plate and the upper cover by using a high-strength bolt (2);
and step 3: the measurement is started, the second stop valve (17) and the first stop valve (12) are opened, then the air pressure meter (13) and the flow meter (15) are opened and adjusted to zero, finally the reducing valve (11) is opened, and the air pressure is controlled within the range of 0.01-0.3 MPa;
and 4, step 4: when the numerical value in the flowmeter (15) does not change any more along with the time, recording the measured flow at the moment, and calculating the gas permeability coefficient of the damaged concrete test piece (6);
and 5: after the test is finished, the second stop valve (17) and the first stop valve (12) are closed, then the air pressure meter (13) and the flow meter (15) are closed, and after the air release is finished, the damaged concrete test piece (6) in the annular sleeve (4) is taken out.
8. The damaged concrete gas permeability detection method according to claim 7, wherein in the step 4, a gas permeability coefficient calculation formula for calculating the gas permeability coefficient of the damaged concrete specimen (6) is as follows:
In the formula: k-permeability coefficient, m, of damaged concrete specimen (6)2；
QGo out-flow at the outlet end, i.e. reading, m, measured by the flowmeter (15)3/s；
r-radius of the tested damaged concrete test piece (6), m;
P2pressure at the outlet, atmospheric pressure, N/m2；
P1Pressure at the inlet end, i.e. measured by a barometer (13), N/m2；
Mu-viscosity coefficient of gas, determined by ambient temperature at the time of detection, S.N/m2；
L is the thickness m of the tested damaged concrete test piece (6);
a-the area of the damage position of the detected damaged concrete sample (6), which is the average value of the front surface and the back surface of the damaged concrete sample (6), is detected by CAD software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680625.2A CN111855527A (en) | 2020-07-15 | 2020-07-15 | Damaged concrete gas permeability detection device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680625.2A CN111855527A (en) | 2020-07-15 | 2020-07-15 | Damaged concrete gas permeability detection device and method |
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| Publication Number | Publication Date |
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| CN111855527A true CN111855527A (en) | 2020-10-30 |
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