CN112213249A - Gas permeability test device for alkaline cured sample under influence of carbonization and operation method - Google Patents
Gas permeability test device for alkaline cured sample under influence of carbonization and operation method Download PDFInfo
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- CN112213249A CN112213249A CN202011114417.2A CN202011114417A CN112213249A CN 112213249 A CN112213249 A CN 112213249A CN 202011114417 A CN202011114417 A CN 202011114417A CN 112213249 A CN112213249 A CN 112213249A
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- 230000035699 permeability Effects 0.000 title claims abstract description 80
- 238000003763 carbonization Methods 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000523 sample Substances 0.000 claims abstract description 119
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- 238000001764 infiltration Methods 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 230000008595 infiltration Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 214
- 239000004575 stone Substances 0.000 claims description 48
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 239000002689 soil Substances 0.000 claims description 31
- 239000002585 base Substances 0.000 claims description 21
- 238000010000 carbonizing Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000395 magnesium oxide Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 7
- 239000004816 latex Substances 0.000 claims description 7
- 229920000126 latex Polymers 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 210000000621 bronchi Anatomy 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 229910052729 chemical element Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 25
- 238000005273 aeration Methods 0.000 description 10
- 239000004568 cement Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 239000004927 clay Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QRGVJYFZZFSGAK-UHFFFAOYSA-N C(=O)=O.[O-2].[Mg+2] Chemical compound C(=O)=O.[O-2].[Mg+2] QRGVJYFZZFSGAK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a gas permeability test device of an alkaline solidified sample under the influence of carbonization and an operation method. The device is specially provided with a steering ball valve and a data acquisition controller, realizes real-time or timing exchange of infiltration gas and opening and closing of carbon dioxide, and is specially provided with a barometer, a mass flow meter and a temperature probe, so that the pressure, the flow and the reaction temperature of the gas during input and discharge can be accurately monitored. The device has compact structure and simple operation. The method has the advantages that the carbonization maintenance of the sample and the gas permeability test are carried out in a circulating mode under different carbonization degrees, the influence of sample water soaking and unsaturated gas is eliminated, the defect that the traditional water permeability coefficient measurement error is large is overcome, the gas permeability coefficient of the test sample is more suitable for solving the background problem, the method is close to the real situation, and the result preparation degree is high. The redundant carbon dioxide can be absorbed by the tail end alkali liquor bottle, so that the environmental pollution in the test process is avoided.
Description
Technical Field
The invention belongs to civil engineering instrument devices and testing methods, and particularly relates to a gas permeability testing device of an alkaline cured sample under the influence of carbonization and an operation method.
Background
With the development of economy and urbanization in China, the foundation construction of urban construction, traffic and water conservancy and the like often meets soft soil layers or liquefied silt soil layers with different thicknesses, and the soil has the poor characteristics of low strength, high compressibility, large pore ratio, high water content and the like, so that great challenges are brought to engineering construction. The mechanical strength and stability of the weak soil or sandy soil are required to be improved by manual improvement treatment so as to meet the requirements of engineering construction. The traditional method for treating weak soil or silt soil is divided into physical treatment, chemical curing treatment and microbial curing treatment. However, the traditional curing method has long treatment and maintenance period, the material cement used for chemical curing has large energy resource consumption, serious environmental pollution and high economic cost of microbial curing in the production process, and brings negative effects to the sustainable development of economy and environment.
Therefore, geotechnical workers begin to explore cement substitute materials and corresponding curing methods, and the inventors have conducted a great deal of research by using active magnesium oxide and carbon dioxide as curing agents to replace conventional cement for curing soft soil, and have disclosed a series of inventions: for example, "a method for carbonizing and solidifying soil (201210097042.2)", "a system and a method for treating soft soil foundation by using industrial waste gas heat (201310122135.0)", "a system and a method for carbonizing and piling (2014102039788)" for foundation reinforcement "," a method for carbonizing and consolidating a filling layer of soft soil foundation (2014102729571) "," a method for in-situ carbonizing and solidifying shallow soft foundation (201510348797.9) ", and" a carbonized-stirred pile-air-permeable tubular pile composite foundation and a construction method thereof (201710225231.6) ", these patents are soft soil treatment technologies disclosed based on a magnesium oxide-carbon dioxide carbonization mechanism. However, successful implementation of these treatment techniques has relied on the migration and carbonization of carbon dioxide gas in the magnesia clay, which in turn is affected by the permeability of the solidified-like gas. Under different inlet pressures, the gas can be completely transported and permeated for a long time, and the change rule of the permeability coefficient of the gas in the soil body is not clear. The existing device and method do not consider the problem of gas permeability attenuation of the soil body in the carbonization engineering, and the phenomenon usually occurs because the soil body can generate a large amount of cements in the carbonization process, and the cements can reduce the gas permeability of the soil body while improving the strength and compactness of the soil body, so that all parts of the soil body are not carbonized uniformly, and therefore, the problem of urgent need to be solved by exploring the gas permeability attenuation rule of the soil body in the carbonization process is solved.
In recent years, researchers have explored various devices and methods for testing the permeability of soil, such as a three-axis soil-based unsaturated soil gas permeability measurement method (201310733764.7); an earth pillar device and a method (202010312940.X) for measuring the gas permeability and diffusion coefficient of unsaturated soil mass; and a gas permeability test method (201910979179.2) for high-compactness concrete. The gas permeability of the sample is obtained by introducing gas with certain pressure into the sample to be measured and calculating according to the gas inlet flow and the gas outlet flow, and the permeability of the sample is stable and unchanged. However, the existing gas permeability tester is difficult to be combined with a soil body carbonization device, can not switch back and forth between two different gases, namely carbonized gas and test gas, and is difficult to meet the requirement of a sample with changed permeability; the existing tester needs to perform calculation of gas permeability after one-time complete ventilation operation, and the ventilation process is complex, so that the requirement of testing according to the soil carbonization degree in the carbonization process cannot be met. Therefore, the exploration of a gas permeability testing device and an operation method under the influence of carbonization is extremely important, and the method has direct and practical significance for optimizing the method for carbonizing the improved soil body and better applying the method to engineering practice.
Disclosure of Invention
Aiming at the defects of the background technology, the invention aims to provide a gas permeability test device of an alkaline solidification sample under the influence of carbonization and an operation method thereof.
In order to achieve the above object, the present invention discloses a gas permeability test apparatus for an alkaline solidified sample under the influence of carbonization, which is characterized in that the test apparatus comprises a confining pressure-gas permeability supply device, a carbonization-permeation device and a flow-temperature monitoring device,
the confining pressure-gas permeation supply device comprises a high-pressure gas tank A and a high-pressure gas tank B, a pressure reducing valve A is arranged between the high-pressure gas tank A and a main gas pipe A, the other end of the main gas pipe A is connected with one end of a three-way joint, the other two ends of the three-way joint are respectively connected with a branch gas pipe A and a branch gas pipe B, the other end of the branch gas pipe A is connected with a confining pressure plug hole, and a pressure regulating valve A and a gas pressure gauge A are sequentially arranged on the branch gas pipe A from the three-way joint to the confining pressure plug; a pressure reducing valve B is arranged between the high-pressure gas tank B and the main gas pipe B, the other end of the main gas pipe B and the other end of the branch gas pipe B are connected to a steering ball valve, the steering ball valve is connected with a gas inlet plug hole through a gas inlet pipe, a pressure regulating valve B and a gas pressure gauge B are sequentially arranged on the branch gas pipe B between the three-way joint and the steering ball valve, and a pressure regulating valve C and a gas pressure gauge C are sequentially arranged on the main gas pipe B between the pressure reducing valve B and the steering ball valve;
the carbonization-permeation device mainly comprises a pressure chamber, the outer side of the pressure chamber is fixedly and stably fixed by a fixing rod, a base, a lower permeable stone, an upper permeable stone and a top seat are sequentially arranged in the pressure chamber from bottom to top, a confining pressure plug hole, an air inlet plug hole and a sealing plug are arranged at the bottom of the pressure chamber, the air inlet plug hole is arranged below the base, an exhaust hole and a sealing rubber ring are arranged at the top of the pressure chamber, an exhaust valve is arranged on an air pipe connected to the exhaust hole, an air outlet pipe is connected to the top seat, the air outlet pipe is connected to an alkali liquor bottle through the sealing rubber ring, the alkali liquor bottle is placed on an electronic bottle, and a control valve and a baro;
the flow-temperature monitoring device comprises a mass flow meter A, a mass flow meter B, a temperature probe A, a temperature probe B, a data acquisition controller and a computer, wherein the mass flow meter A is arranged on the air inlet pipe, the mass flow meter B is arranged on the air outlet pipe, the temperature probe A is fixedly arranged in the base and the lower permeable stone, and the temperature probe A is flush with the upper surface of the lower permeable stone; the temperature probe B is fixedly arranged in the top seat and the upper permeable stone, and is flush with the lower surface of the upper permeable stone; the mass flow meter A, the mass flow meter B, the temperature probe A and the temperature probe B are all connected to a data acquisition controller through data lines, and the data acquisition controller and the electronic antenna are connected to a computer through the data lines on average.
As an improvement of the invention, the pressure chamber is made of organic glass, and the maximum bearing pressure is 0.8 MPa; the gas flow directions of the three-way joint and the steering ball valve are both one-way, and the steering ball valve can be communicated with the branch gas pipe B and the gas inlet pipe, or communicated with the main gas pipe B and the gas inlet pipe, or blocked from the branch gas pipe B and the main gas pipe B.
The improved temperature probe is characterized in that the base, the lower permeable stone, the upper permeable stone and the top seat are all reserved with pore channels of the temperature probe.
Specifically, the method for operating a gas permeability test apparatus for an alkaline cured sample under the influence of carbonization according to the present invention is characterized by comprising the steps of:
a. and (3) sample installation: opening a pressure chamber, placing a lower permeable stone on a base, adjusting a lower temperature probe to be flush with the upper surface of the lower permeable stone, then placing a sample on the lower permeable stone, sleeving a latex film on the sample and the outer side of the base, then sequentially placing an upper permeable stone and a top seat on the sample, placing an upper temperature probe through a reserved pore channel, adjusting the latex film, tightly wrapping the base and the top seat, installing the pressure chamber, screwing a fixed rod, and finally connecting each pipeline, the lower temperature probe, the upper temperature probe, a mass flowmeter A and a mass flowmeter B;
b. confining pressure application of the pressure chamber: opening the pressure reducing valve A and the pressure regulating valve A, closing the pressure regulating valve B, adjusting the pressure regulating valve A to enable the barometer A to be stable to a preset pressure value, and enabling the gas in the high-pressure gas tank A to be pressed into the pressure chamber to provide confining pressure for the sample;
c. carbonizing and curing the sample: opening a pressure reducing valve B and a pressure regulating valve C, regulating the pressure regulating valve C to enable a barometer C to be stabilized to a preset carbonization pressure value, opening a control valve, starting a computer and a data acquisition controller, adjusting a steering ball valve to enable a main gas pipe B to be communicated with a gas inlet pipe, enabling gas in a high-pressure gas tank B to infiltrate into a sample, and simultaneously acquiring readings of a mass flowmeter A, a mass flowmeter B, a lower temperature probe, an upper temperature probe and an electronic balance; over time t1Then, adjusting a steering ball valve to ensure that the branch air pipe B and the main air pipe B are not communicated with the air inlet pipe, and maintaining the sample;
d. gas permeation testing of the samples: after curing time t2And then, opening and adjusting the pressure regulating valve B to stabilize the barometer B to a preset air inlet pressure value, adjusting the steering ball valve to communicate the bronchus B with the air inlet pipe, and performing a gas permeability test until the readings of the mass flow meter A and the mass flow meter B are stable, wherein the gas permeability time is t3；
e. And (3) carbonizing and curing the sample again: through gas permeation time t3Then, the steering ball valve is adjusted to enable the main air pipe B to be communicated with the air inlet pipe, and the ventilation time t is4Then, adjusting a steering ball valve to ensure that the branch air pipe B and the main air pipe B are not communicated with the air inlet pipe, and maintaining the sample;
f. retesting of sample gas permeability: after curing time t5Then, the steering ball valve is adjusted to enable the bronchus B to be communicated with the air inlet pipe, and the gas permeability test is carried out again until the readings of the mass flow meter A and the mass flow meter B are stable, wherein the gas permeability time is t6；
g. Carbonization and permeability test cycle operation: and (f) performing cyclic operation of carbonization curing and gas permeability according to the steps e and f until the measured gas permeability coefficient is stable.
Preferably, the alkaline curing sample is a sample prepared by using magnesium oxide or calcium oxide or a mixture of the magnesium oxide and the calcium oxide as a curing agent and adding the curing agent into weak soil or polluted soil or mortar.
Preferably, the high-pressure gas tank B contains carbon dioxide compressed gas, the high-pressure gas tank a contains nitrogen or inert gas which does not react with the alkaline material and carbon dioxide, and the inert gas is a gas of a group zero element in the periodic table of chemical elements.
Preferably, the permeability coefficient is calculated according to equation (1):
in the formula (1), QAiAnd QBiRespectively obtaining stable values of a mass flowmeter A and a mass flowmeter B in the gas permeability test process; mu is the viscosity coefficient of the gas to be permeated, pAiAnd pBiRespectively, stable readings of barometer B and barometer D, where pBiClose to atmospheric pressure.
Preferably, the gas permeability coefficients of the lower permeable stone and the upper permeable stone are far larger than the permeability coefficient of the sample, and the influence of the lower permeable stone and the upper permeable stone on gas infiltration is neglected in calculation.
Compared with the prior art, the invention has the beneficial effects that:
1) the special steering ball valve and the data acquisition controller can realize the exchange of infiltration gas in real time or at regular time, realize the input of carbon dioxide gas or non-reactive inert gas participating in reaction or stop the input of gas and the like, and the gas conveying time and the conveying pressure are adjustable.
2) The special barometer, the mass flowmeter and the temperature probe can accurately monitor the air pressure and the flow when the gas is input and discharged, reflect the pressure gradient of the upper surface and the lower surface of a test sample, and simultaneously monitor the reaction temperature generated when carbon dioxide is conveyed and carbonized.
3) The gas permeability test of the sample under different carbonization degrees is realized, so that the carbonization maintenance and the gas permeability test of the sample are circularly and uninterruptedly carried out, beneficial guidance is provided for the scheme design of the aeration and carbonization of the sample, and the improvement of the use efficiency of carbon dioxide gas is facilitated.
4) Confining pressure and osmotic pressure are exerted and are all adopted gaseous form, compare in traditional liquid water infiltration, and the operation is more convenient, is favorable to eliminating the water soaking and the unsaturated gas influence of sample, has overcome the big defect of traditional water permeability coefficient measurement error, and the gas measurement permeability coefficient of test sample is more fit for solving the background problem, is closer with the true condition.
5) The control valve on the outlet duct can be closed or opened during the carbonization of ventilating, and when the gas was ventilated and is permeated, the control valve was opened, and experimental operation accords with actual conditions more, and after the carbonization of ventilating, unnecessary carbon dioxide gas all can absorb through the alkali lye bottle of tail end in the sample or in the pipeline, has avoided the environmental pollution among the test process.
Drawings
FIG. 1 is a schematic view of the structure of a gas permeability test apparatus for an alkaline cured sample under the influence of carbonization.
In the figure: 1. high-pressure gas tanks A, 2, pressure reducing valves A, 3, main gas pipes A, 4, three-way joints, 5, branch gas pipes A, 6, pressure regulating valves A, 7, barometers A, 8, branch gas pipes B, 9, pressure regulating valves B, 10, barometers B, 11, high-pressure gas tanks B, 12, pressure reducing valves B, 13, main gas pipes B, 14, pressure regulating valves C, 15, barometers C, 16, steering ball valves, 17, gas inlet pipes, 18, mass flowmeters A, 19, fixing rods, 20, pressure chambers, 21, latex films, 22, samples, 23, lower permeable stones, 24, bases, 25, confining pressure plug holes, 26, gas inlet plug holes, 27, sealing plugs, 28, temperature probes A, 29, upper permeable stones, 30, temperature probes B, 31, top seats, 32, exhaust holes, 33, exhaust valves, 34, sealing rubber rings, 35, gas outlet pipes, 36, control valves, 37, barometers D, 38 and mass flowmeters B, 39. the device comprises an alkali liquor bottle 40, an electronic balance 41, a data acquisition controller 42 and a computer.
Detailed Description
In the description of the present invention, it should be understood that the orientations and positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like are based on the orientations and positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply any particular orientation which is necessary in the device to which the present invention is directed, and therefore, the present invention should not be construed as being limited. In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the figures.
The invention discloses a gas permeability test device of an alkaline solidified sample under the influence of carbonization, which is characterized by comprising a confining pressure-gas permeability supply device, a carbonization-permeation device and a flow-temperature monitoring device,
the confining pressure-gas permeation supply device comprises a high-pressure gas tank A1 and a high-pressure gas tank B11, a pressure reducing valve A2 is arranged between the high-pressure gas tank A1 and a main gas pipe A3, the other end of the main gas pipe A3 is connected to one end of a three-way joint 4, the other two ends of the three-way joint 4 are respectively connected with a branch gas pipe A5 and a branch gas pipe B8, the other end of the branch gas pipe A5 is connected to a confining pressure plug hole 25, and a pressure regulating valve A6 and a pressure gauge A7 are sequentially arranged on the branch gas pipe A5 from the three-way joint 4 to the confining pressure plug; a pressure reducing valve B12 is arranged between the high-pressure gas tank B11 and the main gas pipe B13, the other end of the main gas pipe B13 and the other end of the branch gas pipe B8 are connected to the steering ball valve 16, the steering ball valve 16 is connected with the gas inlet plug hole 26 through a gas inlet pipe 17, a pressure regulating valve B9 and a gas pressure gauge B10 are sequentially arranged on the branch gas pipe B8 between the three-way joint 4 and the steering ball valve 16, a pressure regulating valve C14 and a gas pressure gauge C15 are sequentially arranged on the main gas pipe B13 between the pressure reducing valve B12 and the steering ball valve 16, the gas flow directions of the three-way joint 4 and the steering ball valve 16 are all unidirectional, and the steering ball valve 16 can be communicated with the branch gas pipe B8 and the gas inlet pipe 17, or communicated with the main gas pipe B13 and the gas inlet pipe 17;
the carbonization-infiltration device mainly comprises a pressure chamber 20, the outer side of the pressure chamber 20 is fixedly and stably fixed by a fixing rod 19, a base 24, a lower permeable stone 23, an upper permeable stone 29 and a top seat 31 are sequentially arranged in the pressure chamber 20 from bottom to top, a confining pressure plug hole 25, an air inlet plug hole 26 and a sealing plug 27 are arranged at the bottom of the pressure chamber 20, the air inlet plug hole 26 is arranged below the base, an exhaust hole 32 and a sealing rubber ring 34 are arranged at the top of the pressure chamber 20, an exhaust valve 33 is arranged on an air pipe connected to the exhaust hole 32, an air outlet pipe 35 is connected to the top seat 31, the air outlet pipe 35 is connected to an alkali liquor bottle 39 through the sealing rubber ring 34, the alkali liquor bottle 39 is placed on an electronic balance 40, a control valve 36 and a barometer D37 are further sequentially arranged on the air outlet pipe 35, the pressure chamber 20 is;
the flow-temperature monitoring device comprises a mass flow meter A18, a mass flow meter B38, a temperature probe A28, a temperature probe B30, a data acquisition controller 41 and a computer 42, wherein the mass flow meter A18 is arranged on the air inlet pipe 17, the mass flow meter B38 is arranged on the air outlet pipe 35, the temperature probe A28 is fixedly arranged in the base 24 and the lower permeable stone 23, and the temperature probe A28 is flush with the upper surface of the lower permeable stone 23; the temperature probe B30 is fixedly arranged in the top seat 31 and the upper permeable stone 29, and the temperature probe B30 is flush with the lower surface of the upper permeable stone 29; the mass flow meter A18, the mass flow meter B38, the temperature probe A28 and the temperature probe B30 are all connected to the data acquisition controller 41 through data lines, the data acquisition controller 41 and the electronic balance 40 are all connected to the computer 42 through data lines, and the base 24, the lower permeable stone 23, the upper permeable stone 29 and the top seat 31 are all reserved with pore channels of the temperature probes.
Specifically, the method for operating a gas permeability test apparatus for an alkaline cured sample under the influence of carbonization according to the present invention is characterized by comprising the steps of:
a. and (3) sample installation: opening the pressure chamber 20, placing the lower permeable stone 23 on the base 24, adjusting a temperature probe B30 to be flush with the upper surface of the lower permeable stone 23, then placing a sample 22 on the lower permeable stone 23, sleeving a latex film 21 on the sample 22 and the outer side of the base 24, then sequentially placing an upper permeable stone 29 and a top seat 31 on the sample 22, placing a temperature probe A28 through a reserved hole, adjusting the latex film 21, tightly wrapping the base 24 and the top seat 31, installing the pressure chamber 20, screwing a fixing rod 19, and finally connecting pipelines, a temperature probe B30, a temperature probe A28, a mass flow meter A18 and a mass flow meter B38;
b. confining pressure application of the pressure chamber: opening a pressure reducing valve A2 and a pressure regulating valve A6, closing a pressure regulating valve B9, adjusting the pressure regulating valve A6 to enable a barometer A7 to be stable to a preset pressure value, and enabling gas in a high-pressure gas tank A1 to be pressed into a pressure chamber 20 to provide confining pressure for a sample;
c. carbonizing and curing the sample: opening the pressure reducing valve B12 and the pressure regulating valve C14, adjusting the pressure regulating valve C14 to make the barometer C15 stabilize to the preset carbonization pressure value, opening the control valve 36, and opening the computer 42 and the pressure regulating valve C14The data acquisition controller 41 adjusts the steering ball valve 16 to enable the main air pipe B13 and the air inlet pipe 17 to be communicated, enables gas in the high-pressure air tank B11 to permeate into a sample, and simultaneously acquires readings of the mass flow meter A18, the mass flow meter B38, the temperature probe B30, the temperature probe A28 and the electronic balance 40; over time t1Then, adjusting the steering ball valve 16 to ensure that the branch air pipe B8 and the main air pipe B13 are not communicated with the air inlet pipe 17, and maintaining the sample;
d. gas permeation testing of the samples: after curing time t2Then, the pressure regulating valve B9 is opened and adjusted to stabilize the barometer B10 to a preset air inlet pressure value, the steering ball valve 16 is adjusted to communicate the branch air pipe B8 with the air inlet pipe 17, and a gas permeability test is carried out until the readings of the mass flow meter A18 and the mass flow meter B38 are stable, wherein the gas permeability time is t3；
e. And (3) carbonizing and curing the sample again: through gas permeation time t3Then, the ball cock 16 is adjusted to connect the main air pipe B13 with the air inlet pipe 17, and the ventilation time t is passed4Then, the steering ball valve 16 is adjusted to ensure that the branch air pipe B8 and the main air pipe B13 are not communicated with the air inlet pipe 17, and the sample is maintained;
f. retesting of sample gas permeability: after curing time t5Then, the ball cock 16 is adjusted again to connect the branch gas pipe B8 with the gas pipe 17, and the gas permeability test is carried out again until the readings of the mass flow meter A18 and the mass flow meter B38 are stable, and the gas permeability time is t6；
g. Carbonization and permeability test cycle operation: and (f) performing cyclic operation of carbonization curing and gas permeability according to the steps e and f until the measured gas permeability coefficient is stable.
Preferably, the alkaline curing sample is a sample prepared by using magnesium oxide or calcium oxide or a mixture of the magnesium oxide and the calcium oxide as a curing agent and adding the curing agent into weak soil or polluted soil or mortar.
Preferably, the high-pressure gas tank B11 contains compressed carbon dioxide gas, and the high-pressure gas tank a1 contains nitrogen or inert gas which does not react with the alkaline material and carbon dioxide, and the inert gas is a gas of a group zero element in the periodic table of chemical elements.
Preferably, the permeability coefficient is calculated according to equation (1):
in the formula (1), QAiAnd QBiThe stable values of mass flow meter a18 and mass flow meter B38 during the gas permeability test, respectively; mu is the viscosity coefficient of the gas to be permeated, pAiAnd pBiThe stable readings of barometer B10 and barometer D37, respectively, where pBiClose to atmospheric pressure.
Preferably, the gas permeability coefficients of the lower permeable stone 23 and the upper permeable stone 29 are far larger than the permeability coefficient of the sample, and the influence of the lower permeable stone 23 and the upper permeable stone 29 on the gas infiltration is neglected in the calculation.
Examples
For easier understanding of the operation of the present invention, the time period of aeration carbonization and gas infiltration, e.g., t, is selected based on the type of sample and curing agent materials, the desired gas pressure and time of aeration for complete carbonization, and the like1、t2、t3、t4、t5、t6… … are provided. If the sample is silt and silty clay with relatively good permeability, the aeration time required for completing the complete carbonization is short and can be completed within 6 hours, and at the moment, the aeration pressure can be selected to be 25-200kPa, the aeration carbonization time is 10-15min, the non-aeration maintenance is 5min, and the gas infiltration time is 15-30 min. If the sample is clay with poor permeability, the aeration time required for completing the complete carbonization is longer, and is generally completed within 12 hours, at this time, the aeration pressure can be 200-400kPa, the carbonization time can be 20-30min, the non-aeration maintenance can be 10-15min, and the gas infiltration time can be 30-60 min. When the gas permeability coefficient is tested in each stage, the gas flow meters and the gas pressure meter D37 on the gas inlet pipe and the gas outlet pipe are stable, otherwise, the measured permeability coefficient cannot truly reflect the permeability coefficient under the current condition.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited by the foregoing examples, which are provided to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A gas permeability test device of an alkaline solidified sample under the influence of carbonization is characterized by comprising a confining pressure-gas permeability supply device, a carbonization-permeation device and a flow-temperature monitoring device,
the confining pressure-gas permeation supply device comprises a high-pressure gas tank A and a high-pressure gas tank B, a pressure reducing valve A is arranged between the high-pressure gas tank A and a main gas pipe A, the other end of the main gas pipe A is connected with one end of a three-way joint, the other two ends of the three-way joint are respectively connected with a branch gas pipe A and a branch gas pipe B, the other end of the branch gas pipe A is connected with a confining pressure plug hole, and a pressure regulating valve A and a gas pressure gauge A are sequentially arranged on the branch gas pipe A from the three-way joint to the confining pressure plug; a pressure reducing valve B is arranged between the high-pressure gas tank B and the main gas pipe B, the other end of the main gas pipe B and the other end of the branch gas pipe B are connected to a steering ball valve, the steering ball valve is connected with a gas inlet plug hole through a gas inlet pipe, a pressure regulating valve B and a gas pressure gauge B are sequentially arranged on the branch gas pipe B between the three-way joint and the steering ball valve, and a pressure regulating valve C and a gas pressure gauge C are sequentially arranged on the main gas pipe B between the pressure reducing valve B and the steering ball valve;
the carbonization-permeation device mainly comprises a pressure chamber, the outer side of the pressure chamber is fixedly and stably fixed by a fixing rod, a base, a lower permeable stone, an upper permeable stone and a top seat are sequentially arranged in the pressure chamber from bottom to top, a confining pressure plug hole, an air inlet plug hole and a sealing plug are arranged at the bottom of the pressure chamber, the air inlet plug hole is arranged below the base, an exhaust hole and a sealing rubber ring are arranged at the top of the pressure chamber, an exhaust valve is arranged on an air pipe connected to the exhaust hole, an air outlet pipe is connected to the top seat, the air outlet pipe is connected to an alkali liquor bottle through the sealing rubber ring, the alkali liquor bottle is placed on an electronic bottle, and a control valve and a baro;
the flow-temperature monitoring device comprises a mass flow meter A, a mass flow meter B, a temperature probe A, a temperature probe B, a data acquisition controller and a computer, wherein the mass flow meter A is arranged on the air inlet pipe, the mass flow meter B is arranged on the air outlet pipe, the temperature probe A is fixedly arranged in the base and the lower permeable stone, and the temperature probe A is flush with the upper surface of the lower permeable stone; the temperature probe B is fixedly arranged in the top seat and the upper permeable stone, and is flush with the lower surface of the upper permeable stone; the mass flow meter A, the mass flow meter B, the temperature probe A and the temperature probe B are all connected to a data acquisition controller through data lines, and the data acquisition controller and the electronic antenna are connected to a computer through the data lines on average.
2. The apparatus for testing gas permeability of an alkaline cured sample under the influence of carbonization as claimed in claim 1, wherein the pressure chamber is made of organic glass and has a maximum bearing pressure of 0.8 MPa; the gas flow directions of the three-way joint and the steering ball valve are both one-way, and the steering ball valve can be communicated with the branch gas pipe B and the gas inlet pipe, or communicated with the main gas pipe B and the gas inlet pipe, or blocked from the branch gas pipe B and the main gas pipe B.
3. The apparatus for testing gas permeability of an alkaline solidified sample under the influence of carbonization as claimed in claim 1, wherein the base, the lower permeable stone, the upper permeable stone and the top seat are all reserved with a hole for a temperature probe.
4. A method of operating a gas permeability test apparatus for alkaline cured samples under the influence of carbonization as claimed in claim 1, comprising the steps of:
a. and (3) sample installation: opening a pressure chamber, placing a lower permeable stone on a base, adjusting a lower temperature probe to be flush with the upper surface of the lower permeable stone, then placing a sample on the lower permeable stone, sleeving a latex film on the sample and the outer side of the base, then sequentially placing an upper permeable stone and a top seat on the sample, placing an upper temperature probe through a reserved pore channel, adjusting the latex film, tightly wrapping the base and the top seat, installing the pressure chamber, screwing a fixed rod, and finally connecting each pipeline, the lower temperature probe, the upper temperature probe, a mass flowmeter A and a mass flowmeter B;
b. confining pressure application of the pressure chamber: opening the pressure reducing valve A and the pressure regulating valve A, closing the pressure regulating valve B, adjusting the pressure regulating valve A to enable the barometer A to be stable to a preset pressure value, and enabling the gas in the high-pressure gas tank A to be pressed into the pressure chamber to provide confining pressure for the sample;
c. carbonizing and curing the sample: opening a pressure reducing valve B and a pressure regulating valve C, regulating the pressure regulating valve C to enable a barometer C to be stabilized to a preset carbonization pressure value, opening a control valve, starting a computer and a data acquisition controller, adjusting a steering ball valve to enable a main gas pipe B to be communicated with a gas inlet pipe, enabling gas in a high-pressure gas tank B to infiltrate into a sample, and simultaneously acquiring readings of a mass flowmeter A, a mass flowmeter B, a lower temperature probe, an upper temperature probe and an electronic balance; over time t1Then, adjusting a steering ball valve to ensure that the branch air pipe B and the main air pipe B are not communicated with the air inlet pipe, and maintaining the sample;
d. gas permeation testing of the samples: after curing time t2And then, opening and adjusting the pressure regulating valve B to stabilize the barometer B to a preset air inlet pressure value, adjusting the steering ball valve to communicate the bronchus B with the air inlet pipe, and performing a gas permeability test until the readings of the mass flow meter A and the mass flow meter B are stable, wherein the gas permeability time is t3；
e. And (3) carbonizing and curing the sample again: through gas permeation time t3Then, the steering ball valve is adjusted to enable the main air pipe B to be communicated with the air inlet pipe, and the ventilation time t is4Then, adjusting a steering ball valve to ensure that the branch air pipe B and the main air pipe B are not communicated with the air inlet pipe, and maintaining the sample;
f. retesting of sample gas permeability: after curing time t5Then, the steering ball valve is adjusted to enable the bronchus B to be communicated with the air inlet pipe, and the gas permeability test is carried out again until the readings of the mass flow meter A and the mass flow meter B are stable, wherein the gas permeability time is t6；
g. Carbonization and permeability test cycle operation: and (f) performing cyclic operation of carbonization curing and gas permeability according to the steps e and f until the measured gas permeability coefficient is stable.
5. The method according to claim 4, wherein the alkaline solidified sample is a sample prepared by adding a solidifying agent into weak soil or polluted soil or mortar by using magnesium oxide or calcium oxide or a mixture of the magnesium oxide and the calcium oxide as the solidifying agent.
6. The operation method according to claim 4, wherein the high-pressure gas tank B contains carbon dioxide compressed gas, the high-pressure gas tank A contains nitrogen or an inert gas which does not react with the alkaline material and the carbon dioxide, and the inert gas is a gas of a group zero element in the periodic table of chemical elements.
7. Operating method according to claim 4, characterized in that the permeability coefficient is calculated according to equation (1):
in the formula (1), QAiAnd QBiRespectively obtaining stable values of a mass flowmeter A and a mass flowmeter B in the gas permeability test process; mu is the viscosity coefficient of the gas to be permeated, pAiAnd pBiRespectively, stable readings of barometer B and barometer D, where pBiClose to atmospheric pressure.
8. The method of claim 4, wherein the gas permeability coefficients of the lower and upper permeable stones are substantially greater than the permeability coefficient of the sample, and the influence of the lower and upper permeable stones on the gas infiltration is ignored in the calculation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113654968A (en) * | 2021-08-30 | 2021-11-16 | 中国矿业大学 | Low-permeability medium gas permeability testing device and installation and testing method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913407A (en) * | 2013-12-26 | 2014-07-09 | 中国人民解放军63653部队 | Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method |
| CN107389398A (en) * | 2017-06-30 | 2017-11-24 | 武汉大学 | A kind of adjustable soil sample instrument for carbonizing of confined pressure |
| CN109765161A (en) * | 2019-01-25 | 2019-05-17 | 中国矿业大学 | It is a kind of to utilize permeability test method and device that bucket offer osmotic pressure and confining pressure are provided |
| CN110044792A (en) * | 2019-04-25 | 2019-07-23 | 合肥工业大学 | A kind of multi-functional low permeability media gas permeability test device and test method |
| CN110160928A (en) * | 2019-05-22 | 2019-08-23 | 同济大学 | Realize the multi-joint flexible wall permeameter and application method that two kinds of solution continuously permeate |
| CN110160929A (en) * | 2019-05-22 | 2019-08-23 | 同济大学 | Realize the flexible wall permeameter and application method that two kinds of solution continuously permeate |
| CN110389100A (en) * | 2019-08-21 | 2019-10-29 | 桂林理工大学 | Temperature Control Type permeameter and its experimental method |
| CN209858393U (en) * | 2019-01-25 | 2019-12-27 | 中国矿业大学 | Permeability testing device for providing osmotic pressure and confining pressure by utilizing flow distribution barrel |
| CN110927038A (en) * | 2019-11-25 | 2020-03-27 | 浙江大学 | Testing device and testing method for soil body soil-water characteristic curve and permeability coefficient test |
-
2020
- 2020-10-16 CN CN202011114417.2A patent/CN112213249B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913407A (en) * | 2013-12-26 | 2014-07-09 | 中国人民解放军63653部队 | Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method |
| CN107389398A (en) * | 2017-06-30 | 2017-11-24 | 武汉大学 | A kind of adjustable soil sample instrument for carbonizing of confined pressure |
| CN109765161A (en) * | 2019-01-25 | 2019-05-17 | 中国矿业大学 | It is a kind of to utilize permeability test method and device that bucket offer osmotic pressure and confining pressure are provided |
| CN209858393U (en) * | 2019-01-25 | 2019-12-27 | 中国矿业大学 | Permeability testing device for providing osmotic pressure and confining pressure by utilizing flow distribution barrel |
| CN110044792A (en) * | 2019-04-25 | 2019-07-23 | 合肥工业大学 | A kind of multi-functional low permeability media gas permeability test device and test method |
| CN110160928A (en) * | 2019-05-22 | 2019-08-23 | 同济大学 | Realize the multi-joint flexible wall permeameter and application method that two kinds of solution continuously permeate |
| CN110160929A (en) * | 2019-05-22 | 2019-08-23 | 同济大学 | Realize the flexible wall permeameter and application method that two kinds of solution continuously permeate |
| CN110389100A (en) * | 2019-08-21 | 2019-10-29 | 桂林理工大学 | Temperature Control Type permeameter and its experimental method |
| CN110927038A (en) * | 2019-11-25 | 2020-03-27 | 浙江大学 | Testing device and testing method for soil body soil-water characteristic curve and permeability coefficient test |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654968A (en) * | 2021-08-30 | 2021-11-16 | 中国矿业大学 | Low-permeability medium gas permeability testing device and installation and testing method thereof |
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