CN212844593U - MICP solidification calcareous sand cylinder sample system appearance - Google Patents
MICP solidification calcareous sand cylinder sample system appearance Download PDFInfo
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- CN212844593U CN212844593U CN202021520358.4U CN202021520358U CN212844593U CN 212844593 U CN212844593 U CN 212844593U CN 202021520358 U CN202021520358 U CN 202021520358U CN 212844593 U CN212844593 U CN 212844593U
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Abstract
The utility model discloses a MICP solidification calcareous sand cylinder sample system appearance, this system appearance include that the slip casting liquid deposits ware, peristaltic pump, slip casting pipe, rubber stopper, ferrule, combination stopper, organic glass pipe, stagnant water valve, drain pipe, effusion collection ware. The sample preparation instrument can meet the use requirements of various grouting methods, including quantitative grouting and non-quantitative grouting. The utility model discloses a system appearance can realize system appearance and slip casting integration, and through the undisturbed slip casting to cylinder calcareous sand sample, realize that the normal position MICP of calcareous sand cylinder triaxial sample consolidates to whole slip casting process is visual, and system appearance is efficient, and the MICP who makes consolidates calcareous sand cell cube sample homogeneity strong.
Description
Technical Field
The utility model relates to a system appearance, concretely relates to MICP solidification calcareous sand cylinder sample system appearance.
Background
The south sea west sand in China is rich in calcareous sand seabed, and has the characteristics of irregular shape, low strength, easiness in crushing and the like. At present, concrete is commonly adopted in construction of south sea west sand island reefMode reinforcement seabed ground such as cement, lime or chemical slip casting, however traditional cementing material such as cement, lime can be to the pH value that changes the soil body, makes the soil body be the basicity and form the erosion environment of certain limit, produces harmful effects to the marine ecology around, and the concrete often loses efficacy because of salt erosion, and later maintenance cost does not change a lot. For chemical grouting materials, water glass (Na) is the other component2SiO3) Besides, most chemical pulp materials are toxic, and the development direction of ecological island reef construction is seriously deviated. Therefore, the research on the ecological, environment-friendly, economic and efficient novel calcareous sand seabed reinforcing technology has great significance.
The microorganism Induced calcium Carbonate Precipitation (MICP) technology is a common biological Induced mineralization reaction process, can induce mineral Precipitation and cementation particles by utilizing a spontaneous reaction in a microorganism metabolism process so as to solve the problems of foundation sandy soil earthquake liquefaction, slope reinforcement, wind prevention and sand fixation, geotechnical material repair and the like, and has a wide engineering application prospect. The main material component of the calcareous sand is calcium carbonate which is the same as a product of MICP curing reaction, so the microbial curing technology of the calcareous sand has the advantages of ecology, environmental protection and the like.
In order to fully research the dynamic and static characteristics of MICP reinforced calcareous sand, corresponding dynamic and static triaxial tests are usually required to be developed, however, at present, no reports are found about an instrument device capable of realizing integration of sample preparation and in-situ solidification of a triaxial cylindrical sample of the calcareous sand, and corresponding technical research needs to be developed urgently.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's defect, provide a MICP solidification calcareous sand cylinder sample system appearance, this system appearance has not only realized the visualization of MICP solidification calcareous sand cylinder sample system appearance process, can also realize the integration of system appearance and normal position solidification, is showing and is improving system appearance precision and efficiency.
The utility model adopts the technical proposal that:
a MICP solidified calcareous sand cylindrical sample preparation instrument comprises a grouting liquid storage vessel, a peristaltic pump, a grouting pipe, a rubber plug, a pipe hoop, a combined plug, an organic glass pipe, a water stop valve, a liquid outlet pipe and a percolate collecting vessel; the grouting liquid storage vessel is internally provided with grouting liquid;
the grouting pipe is used for connecting the grouting liquid storage vessel and the organic glass pipe; the peristaltic pump is arranged on the grouting pipe and is used for injecting grouting liquid into the organic glass pipe; the organic glass tube is obtained by fixing a bivalve mould through a tube hoop, and the sample is convenient to take out on the premise of not damaging the sample after the calcareous sand cylindrical sample is solidified; two ends of the organic glass tube are opened, the top opening is provided with a rubber plug, and the bottom opening is provided with a combined plug; the grouting pipe penetrates through a hole reserved in the center of the rubber plug and extends into the organic glass pipe, and the outer diameter of the grouting pipe is larger than the aperture of the hole reserved in the center of the rubber plug; the combined plug is obtained by combining a rubber plug and biochemical fiber cotton, the biochemical fiber cotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical fiber cotton and the rubber plug are tightly matched, the biochemical fiber cotton in the combined plug can prevent calcium sand from seeping, a hole for inserting a liquid outlet pipe is formed in the center of the rubber plug, the outer diameter of the liquid outlet pipe is larger than the aperture of the hole in the center of the rubber plug, and the position of the liquid outlet pipe can be fixed by utilizing the elasticity of the combined plug; the water stop valve is arranged on the liquid outlet pipe and used for controlling the water outlet amount and stopping water outlet, and the lower part of the liquid outlet pipe is provided with threads; the percolate collecting vessel is positioned below the liquid outlet pipe and is used for receiving grouting liquid flowing down from the organic glass pipe;
the stop valve comprises sleeve and piston, and first one of sleeve is equipped with vertical trompil and has the internal thread, and the lower half is equipped with horizontal trompil and has the internal thread, vertical trompil and horizontal trompil intercommunication, the internal thread and the drain pipe threaded connection of vertical trompil in the sleeve, the piston has the external screw thread, and horizontal trompil and piston screw-thread fit can be sealed completely horizontal trompil through the piston rotation.
In the technical scheme, furthermore, the organic glass tube is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is respectively arranged at the positions of 80mm and 100mm and used as the upper limit and the lower limit of the height of the prepared sample. Therefore, the size of a sample manufactured by the MICP solidified calcareous sand cylindrical sample manufacturing instrument meets the specification that the size (D) of a triaxial compression test sample specified in geotechnical test method Standard (2019) is 39.1mm, the height is within the range of 2D-2.5D, the total height of the organic glass tube is 160mm, the 0mm scale mark at the lower part is 20mm away from the bottom end of the glass tube, and the upper end of the organic glass tube is 40mm away from the 100mm scale mark.
Furthermore, the pipe wall of the organic glass pipe is provided with main scale marks with the interval of 20mm and secondary scale marks with the interval of 2mm, so that layering compaction is facilitated, and the specified size of the sample is strictly met.
Furthermore, the end part of the grouting pipe is positioned in the height range of 70-75 mm of the scale mark of the organic glass pipe, so that the situation that slurry cannot permeate into the inside of the calcareous sand sample due to the fact that the insertion depth of the grouting pipe is too shallow is avoided.
Further, the sample preparation method of the sample preparation instrument comprises the following steps: firstly, the calcareous sand with the soil particle size smaller than 20mm is put into an organic glass tube, a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm is formed after layering and compaction, and grouting is carried out by using a peristaltic pump according to related requirements, so that the MICP solidified calcareous sand cylindrical test meeting the standard requirements is obtained.
Furthermore, in the sample preparation process, the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump after one type of grout is injected, wherein the water stop valve is always kept in a closed state during quantitative grouting, the water stop valve is closed after grouting is completed during non-quantitative grouting, and grouting can be replaced or the peristaltic pump can be directly opened after another type of grout injection or the next round of grouting is started only by meeting the specified standing time.
Furthermore, due to the existence of the peristaltic pump and the water stop valve, the use of various grouting methods can be met, including quantitative grouting and non-quantitative grouting. The utility model discloses a system appearance can be convenient command slip casting's finish time, and control method is: for quantitative grouting, only a certain amount of grouting liquid is put into the grouting liquid storage vessel, the peristaltic pump is opened, the water stop valve is closed, and the peristaltic pump is closed after the grouting liquid in the grouting liquid storage vessel is injected; for non-quantitative grouting, only the water stop valve needs to be opened, the grouting liquid to be seeped can stably flow out (when the grouting liquid can flow out at a constant speed, the stable flow out can be regarded as), then grouting is finished, and the water stop valve and the peristaltic pump are closed.
The beneficial effects of the utility model reside in that:
the utility model discloses can realize making appearance and slip casting integration, through the undisturbed slip casting to cylinder calcareous sand sample, realize that the normal position MICP of calcareous sand cylinder triaxial sample consolidates, make appearance efficient, the MICP who makes consolidates calcareous sand cell cube sample homogeneity strong. Adopt the utility model discloses a MICP solidification calcareous sand cylinder sample appearance system appearance can the accurate preparation of the layering of triaxial sample, and because the organic glass pipe is transparent, the event can realize the system appearance and the visual of slip casting of calcareous sand cylinder sample. The organic glass tube is a bivalve mold, and the sample is convenient to take out on the premise of not damaging the sample after the calcareous sand cylindrical sample is solidified. The pipe hoop can be tightly fixed the organic glass pipe bivalve mould and adorn the appearance, avoids leaking thick liquid, can open the pipe hoop after the solidification of calcareous sand cylinder sample, opens the organic glass pipe bivalve mould, is convenient for take a sample under the prerequisite that does not harm the sample. The wall of the organic glass tube is also provided with a primary scale and a secondary scale, which is beneficial to layering and compacting during sample preparation and realizes the accurate manufacture of the calcareous sand triaxial sample. The sample preparation instrument can meet the use requirements of various grouting methods, including quantitative grouting and non-quantitative grouting.
Drawings
FIG. 1 is a schematic view of a MICP solidified calcareous sand cylindrical sample preparation instrument;
FIG. 2 is an elevational view (in mm) of a plexiglas tube;
FIG. 3 is a schematic diagram of a rubber stopper (unit: mm) in which (1) and (2) are bottom views thereof and (3) is a side view thereof;
FIG. 4 is a schematic diagram of a composite plug (in mm) wherein (1) is a bottom view thereof, (2) is a top view thereof, and (3) is a side view thereof;
FIG. 5 is a schematic view of the effluent tube (unit: mm);
fig. 6 is a view of a water stop valve and sectional views (unit: mm), wherein (1) is a left side view thereof, (2) is a right side view thereof, (3) is a front view thereof, (4) is a top view thereof, (5) is a 1-1 sectional view thereof, and (6) is a 2-2 sectional view thereof.
In the figure:
1-grouting liquid storage vessel; 2-a peristaltic pump; 3-grouting pipe; 4-rubber stopper; 5, pipe hoop; 6-organic glass tube; 7-a combination plug; 8, a liquid outlet pipe; 9-percolate collecting vessel; 10-water stop valve; 11-a sleeve; 12-piston.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Fig. 1 shows a MICP solidified calcareous sand cylindrical sample preparation instrument of the present invention, which comprises a grouting liquid storage vessel 1, a peristaltic pump 2, a grouting pipe 3, a rubber stopper 4, a pipe hoop 5, an organic glass pipe 6, a combined stopper 7, a drain pipe 8, a percolate collection vessel 9 and a water stop valve 10;
the grouting pipe 3 is used for connecting the grouting liquid storage vessel 1 and the organic glass pipe 6; the peristaltic pump 2 is arranged on the grouting pipe 3 and is used for injecting the grouting liquid 3 into the organic glass pipe 6, and the flowing direction of the grouting liquid 3 is shown as the arrow direction in figure 1; the grouting pipe 3 penetrates through a rubber plug 4 arranged at an opening at the top of the organic glass pipe 6 and extends into the organic glass pipe 6; the organic glass tube 6 is obtained by fixing a bivalve mould through a tube hoop 5, the two ends of the organic glass tube are open, the top opening of the organic glass tube is provided with the rubber plug 4, and the bottom opening of the organic glass tube is provided with the combined plug 7; the grouting pipe 3 penetrates through a hole reserved in the center of the rubber plug 4 and extends into the organic glass pipe 6, and the outer diameter of the grouting pipe 3 is larger than the aperture of the hole reserved in the center of the rubber plug 4; the combined plug 7 is obtained by combining a rubber plug and biochemical cellucotton, the biochemical cellucotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical cellucotton and the rubber plug are tightly matched, a hole for inserting the liquid outlet pipe 8 is formed in the center of the rubber plug, and the outer diameter of the liquid outlet pipe 8 is larger than the aperture of the hole in the center of the rubber plug; the water stop valve 10 is arranged on the liquid outlet pipe 8 and used for controlling the water outlet amount and stopping water outlet; the percolate collecting dish 9 is positioned below the liquid outlet pipe 8 and is used for receiving the grouting liquid 3 flowing down from the organic glass pipe 6.
The organic glass tube 6 is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is respectively arranged at the positions of 80mm and 100mm and used as the upper limit and the lower limit of the height of the prepared sample. As shown in figure 2, the tube wall of the organic glass tube 6 is provided with main scale marks with the interval of 20mm and secondary scale marks with the interval of 2mm, which is beneficial to layering and compacting and strictly meets the specified size of a sample. The end part of the grouting pipe 3 is positioned in the height range of 70 mm-75 mm of the scale mark of the organic glass pipe 6.
The sample preparation method of the sample preparation instrument comprises the following steps: firstly, the calcareous sand with the soil particle diameter smaller than 20mm is put into an organic glass tube 6, a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm is formed after layering and compaction, and grouting is carried out by utilizing a peristaltic pump 2 according to relevant requirements, so that the MICP solidified calcareous sand cylindrical test meeting the standard requirements is obtained.
In the sample preparation process, the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump 2 after one type of grout is injected, wherein the water stop valve 10 is always kept in a closed state during quantitative grouting, the water stop valve 10 is closed after grouting is completed during non-quantitative grouting, and grouting can be replaced or the peristaltic pump 2 is directly opened after another type of grout injection or the next round of grouting is started only by meeting the specified standing time.
If the grouting is quantitative, only a fixed grouting liquid needs to be placed in the grouting liquid storage vessel 1, the peristaltic pump 2 is opened, the water stop valve 10 is closed, and the peristaltic pump 2 is closed after the grouting liquid 3 in the grouting liquid storage vessel 1 is injected; if the slurry is not quantitative, only the peristaltic pump 2 and the water stop valve 10 need to be opened, the slurry seeping out of the liquid outlet pipe 8 can stably flow out, and the water stop valve and the peristaltic pump are closed after the slurry injection is finished.
The rubber stopper 4 at the top of the organic glass tube 6 is an inverted hollow round table with the height of 40mm, the diameter of the upper bottom of 50mm and the diameter of the lower bottom of 39.1mm, the diameter of the middle of the round table is 5mm, as shown in (1) - (3) in fig. 3, a grouting tube 3 with the inner diameter of 3mm and the outer diameter of 9mm is inserted into the round hole of 5mm, and by means of the elasticity of the rubber stopper 5, the size can enable the rubber stopper 5 to be tightly attached to the inner wall of the organic glass tube 6, so that slurry leakage is avoided, and the position of the grouting tube 3 can be strictly fixed.
A specific structure of the combination plug 7 is shown in fig. 4 (1) to (3). The biochemical fiber cotton on the upper part of the combined plug 7 forms a solid cylinder with the height of 10mm and the diameter of 39.1mm, the rubber plug on the lower part of the combined plug 7 is a circular table with the height of 40mm, the diameter of the upper bottom of 39.1mm and the diameter of the lower bottom of 50mm, a hole of 5mm is arranged in the center, the biochemical fiber cotton in the combined plug 7 can prevent the calcareous sand from leaking but can not prevent the slurry from flowing out, the combined plug 7 can be tightly attached to the inner wall of the organic glass tube 6 by utilizing the elasticity of the combined plug 7, the slurry leakage is avoided, the drain tube 8 with the inner diameter of 3mm and the outer diameter of 9mm is inserted into the circular hole of 5mm, and the position of the drain tube 8 is strictly.
The liquid outlet pipe 8 has an outer diameter of 9mm, an inner diameter of 5mm and a length of 40mm, and a section of 10mm high spiral thread is arranged on the periphery of the lower part of the liquid outlet pipe and used for installing a water stop valve 10, as shown in fig. 5.
The water stop valve 10 is composed of a sleeve 11 and a piston 12, a vertical opening is formed in the upper half portion of the sleeve 11 and is provided with an internal thread, a transverse opening is formed in the lower half portion of the sleeve 11 and is provided with an internal thread, the vertical opening is communicated with the transverse opening, the internal thread of the vertical opening in the sleeve 11 is in threaded connection with the liquid outlet pipe 8, the piston 12 is provided with an external thread, the transverse opening is in threaded fit with the piston 12, and the transverse opening can be completely sealed through rotation of the piston 12; as shown in fig. 6(6), the inner wall of the sleeve 11 of the water stop valve 10 has 10mm of spiral lines from the top end to the bottom so that the sleeve can be fixed on the liquid outlet pipe 8, 9mm below 10mm of spiral lines closely attached to the piston 12, the sleeve 11 has 25mm of height, 19mm of outer diameter and 9mm of inner diameter, the hole of the sleeve 11 within 10mm below the top end is a circular hole with 9mm of diameter, the shape of the hollow outside the range is closely closed with the shape of the piston 12, the water outlet amount can be controlled and the water outlet can be closed by rotating the piston 12, and as shown in fig. 6(6), the water stop valve 10 can be closed to prevent slurry from leaking during quantitative grouting; during non-quantitative grouting, the water stop valve 10 can be opened during grouting until the grouting liquid 3 in the liquid outlet pipe 8 can stably flow out (when the grouting liquid 3 can flow out at a constant speed, the stable outflow can be seen), that is, the grouting is fully finished by closing the water stop valve 10 and the peristaltic pump 2.
Implementation mode of MICP solidified calcareous sand cylindrical sample preparation instrument
The double-section mold of the glass tube is taken out, the glass tube and the double-section mold are tightly combined into a whole by using the tube hoop 5, and the combined plug 7 is inserted into the lower part of the organic glass tube 6, so that the end part of one end of the biochemical fiber cotton of the combined plug 7 is tightly superposed with the 0 scale mark of the tube wall of the organic glass tube. And screening out the calcareous sand with the soil sample particle size of less than 20mm by using a coarse screen with the aperture of 20mm through a screening method.
And (3) performing layered compaction on the calcareous sand loaded into the organic glass tube 6 by using a compaction hammer according to the standard of geotechnical test method (2019), compacting each layer for 3-4 times to reach the layered design height of 20mm, performing the steps layer by layer until the last layer is reached, inserting the grouting tube 3 sleeved with the rubber plug 4 into the organic glass tube 6, manually controlling the bottom end of the grouting tube 3 to be positioned in the height of 70-75 mm of the scale mark of the wall of the organic glass tube 6, and continuously filling. When the last layer is filled, the sand sample of the layer is placed in the range of upper and lower red scale marks of the MICP solidified calcareous sand cylindrical sample preparation instrument shown in figure 2, then the sample is compacted for 3-4 times until the sample height required by the specification is reached, the filling is completed, then the rubber plug 4 is inserted, the drain pipe 8 is inserted into the combined plug 7, the water stop valve 10 is fixed on the drain pipe 8 by utilizing spiral threads, and the percolate collecting vessel 9 is placed below the drain pipe 8.
The grouting process can be divided into quantitative grouting and non-quantitative grouting: for quantitative grouting, closing a water stop valve 10 on the liquid outlet pipe 8, pouring a specified amount of grouting liquid 3 into the grouting liquid storage vessel 1, opening the peristaltic pump 2 until the grouting liquid 3 in the grouting liquid storage vessel 1 is completely injected, and closing the peristaltic pump 2 after grouting is finished if no other liquid needs to be injected; for non-quantitative grouting, only the peristaltic pump 2 needs to be opened to inject required liquid, the water stop valve 10 is opened, and if grouting liquid 3 seeped out from the water stop valve 10 can stably flow out, namely grouting is finished (when the grouting liquid 3 can flow out at a constant speed, the grouting liquid can be regarded as stable outflow).
After grouting, the grouting pipe 3 is pulled out, the mixture is kept stand for a set time, then the pipe hoop 5 is loosened, the organic glass pipe 6 is opened, the two valves of the cemented MICP solidified sample are taken out, the related instruments of the MICP solidified calcareous sand cylindrical sample preparation instrument are arranged, and the sample is subjected to related dynamic and static triaxial tests.
The above-mentioned specific embodiments do not limit the technical solutions of the present invention in any form, and all the technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (4)
1. A MICP solidified calcareous sand cylindrical sample preparation instrument is characterized by comprising a grouting liquid storage vessel, a peristaltic pump, a grouting pipe, a rubber plug, a pipe hoop, a combined plug, an organic glass pipe, a water stop valve, a liquid outlet pipe and a percolate collecting vessel;
the grouting liquid storage vessel is internally provided with grouting liquid; the grouting pipe is used for connecting the grouting liquid storage vessel and the organic glass pipe; the peristaltic pump is arranged on the grouting pipe and is used for injecting grouting liquid into the organic glass pipe; the organic glass tube is obtained by fixing a bivalve mould through a tube hoop, the two ends of the organic glass tube are open, the top opening of the organic glass tube is provided with a rubber plug, and the bottom opening of the organic glass tube is provided with a combined plug; the grouting pipe penetrates through a hole reserved in the center of the rubber plug and extends into the organic glass pipe, and the outer diameter of the grouting pipe is larger than the aperture of the hole reserved in the center of the rubber plug; the combined plug is obtained by combining a rubber plug and biochemical fiber cotton, the biochemical fiber cotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical fiber cotton and the rubber plug are tightly matched, a hole for inserting a liquid outlet pipe is formed in the center of the rubber plug, and the outer diameter of the liquid outlet pipe is larger than the aperture of the hole in the center of the rubber plug; the water stop valve is arranged on the liquid outlet pipe and used for controlling the water outlet amount and stopping water outlet, and the lower part of the liquid outlet pipe is provided with threads; the percolate collecting vessel is positioned below the liquid outlet pipe and is used for receiving grouting liquid flowing down from the organic glass pipe;
the stop valve comprises sleeve and piston, and first one of sleeve is equipped with vertical trompil and has the internal thread, and the lower half is equipped with horizontal trompil and has the internal thread, vertical trompil and horizontal trompil intercommunication, the internal thread and the drain pipe threaded connection of vertical trompil in the sleeve, the piston has the external screw thread, horizontal trompil and piston screw-thread fit.
2. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 1, wherein the organic glass tube is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is arranged at each of 80mm and 100mm to be used as the upper limit and the lower limit of the height of the prepared sample.
3. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 1, wherein the tube wall of the organic glass tube is provided with main scale lines with the distance of 20mm and secondary scale lines with the distance of 2 mm.
4. The MICP solidified calcareous sand cylinder sample preparation instrument according to claim 1, wherein the end of the grouting pipe is positioned in the height range of 70 mm-75 mm of the calibration line of the organic glass pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092730A (en) * | 2021-04-15 | 2021-07-09 | 中国水利水电科学研究院 | Test device for microorganism induced calcium carbonate deposition |
| US20220099539A1 (en) * | 2020-12-11 | 2022-03-31 | Zhejiang University Of Science And Technology | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
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2020
- 2020-07-28 CN CN202021520358.4U patent/CN212844593U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220099539A1 (en) * | 2020-12-11 | 2022-03-31 | Zhejiang University Of Science And Technology | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
| US11644394B2 (en) * | 2020-12-11 | 2023-05-09 | Zhejiang University Of Science And Technology | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
| CN113092730A (en) * | 2021-04-15 | 2021-07-09 | 中国水利水电科学研究院 | Test device for microorganism induced calcium carbonate deposition |
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