CN112180071A - Prestressed duct grouting material pressure bleeding test instrument - Google Patents
Prestressed duct grouting material pressure bleeding test instrument Download PDFInfo
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- CN112180071A CN112180071A CN202011122901.XA CN202011122901A CN112180071A CN 112180071 A CN112180071 A CN 112180071A CN 202011122901 A CN202011122901 A CN 202011122901A CN 112180071 A CN112180071 A CN 112180071A
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- 230000000740 bleeding effect Effects 0.000 title claims abstract description 83
- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 239000000463 material Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000011148 porous material Substances 0.000 claims abstract description 3
- 230000003248 secreting effect Effects 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 41
- 230000028327 secretion Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 210000004911 serous fluid Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The utility model provides a prestressing force pore canal grouting material pressure bleeding test instrument, is including the body and the upper end cover of mutually supporting, the sealed dress that covers of upper end cover is in on the upper port of body, be equipped with the air inlet on the upper end cover, the body is both ends open-ended tubular structure, the sealed lower extreme that is equipped with of lower port of body, be equipped with on the lower extreme cover and secrete the water pipe, secrete the upper end of water pipe and be located in the body, secrete the lower extreme of water pipe and seal and run through the lower extreme end cover outwards extends, secrete the lower extreme of water pipe and be equipped with the valve, secrete the water pipe and be located be equipped with the filter screen on the lateral wall of the part in the body, one side of filter screen with secrete the inner chamber intercommunication of water pipe, the opposite side of filter screen with the inner chamber. The method is suitable for testing the cement grouting material.
Description
Technical Field
The invention relates to the technical field of cement grouting materials, in particular to a pressure bleeding test instrument for a prestressed duct grouting material.
Background
At present, the pressure bleeding test of the prestressed duct grouting material (agent) is always carried out by adopting a test instrument and test steps provided in appendix D in JT/T946-2014 standard. When experiments were conducted in this way in actual inspection work, the following problems were found:
1. for the serosity with zero free bleeding rate, the pressure bleeding data value of more than 90 percent of the tested serosity is larger and exceeds the data index in the standard. The main reasons for the phenomenon are that the early hydration rate of the slurry without free bleeding is high, the performance of the slurry is stable, and the phenomenon of segregation and delamination does not occur. After standing for 10 minutes, the internal channel of the slurry is unobstructed, and under the action of pressure difference, the moisture released by thinning the hydration film continuously flows out through the filter screen;
2. for the serous fluid with the free bleeding rate not equal to zero, the pressure bleeding data is rather small and meets the data index in the standard, and the main reasons for the phenomenon are that the serous fluid with the free bleeding phenomenon has low early hydration rate and is layered due to segregation. After standing for 10 minutes, a sediment layer is formed at the bottom of the container due to segregation and blocks a moisture channel, and the sediment layer is more compact and the moisture is more difficult to seep out under the action of pressure difference.
Therefore, the method has no guiding significance on the grouting material pressure bleeding test, and therefore, a new bleeding test instrument needs to be developed to solve the problems.
Disclosure of Invention
The invention aims to provide a pressure bleeding test instrument for a prestressed duct grouting material, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a prestressing force pore canal grouting material pressure bleeding test instrument, is including the body and the upper end cover of mutually supporting, the sealed dress that covers of upper end cover is in on the upper port of body, be equipped with the air inlet on the upper end cover, the body is both ends open-ended tubular structure, the sealed lower extreme that is equipped with of lower port of body, be equipped with on the lower extreme cover and secrete the water pipe, secrete the upper end of water pipe and be located in the body, secrete the lower extreme of water pipe and seal and run through the lower extreme end cover outwards extends, secrete the lower extreme of water pipe and be equipped with the valve, secrete the water pipe and be located be equipped with the filter screen on the lateral wall of the part in the body, one side of filter screen with secrete the inner chamber intercommunication of water pipe, the opposite side of filter screen with the inner chamber.
The drainage pipe is additionally arranged in the pipe body, the filter screen is additionally arranged on the side wall of the part of the drainage pipe positioned in the pipe body, and the lower end of the drainage pipe is additionally provided with the valve; therefore, when the slurry with zero free bleeding rate is pressurized, because the valve is in a closed state, no pressure difference exists between the inside and the outside of the bleeding pipe, and the slurry is in a pressure state, so that the working condition of the slurry in actual construction is better met; meanwhile, for the slurry with the free bleeding rate not equal to zero, the filter screen is arranged on the side wall of the bleeding pipe instead of the bottom, so that the filter screen is not easy to block, and the accuracy of the test is improved.
Preferably, the air inlet is arranged on the top surface of the upper end cover, and a compressed air quick connector is arranged on the air inlet. Through setting up the air inlet on the top surface of upper end cover to add on the air inlet and establish compressed air quick-operation joint, made things convenient for compressed air's access like this, improved test efficiency.
Preferably, the water drainage pipe is coaxially arranged with the pipe body. The bleeding pipe and the pipe body are designed to be coaxially arranged, so that a sedimentation layer formed by the slurry is prevented from being accumulated on a filter screen on the bleeding pipe, and the accuracy of the test is further improved.
Preferably, the inner diameter of the tube body is 35-50mm, the outer diameter of the water drainage tube is 10-60mm, the length of the tube body is 150-500mm, the length of the water drainage tube is 100-300mm, and the height of the upper port of the water drainage tube is smaller than that of the upper port of the tube body.
Preferably, the side wall of the tube body is provided with scales, and the scales are the volume corresponding to the cavity between the tube body and the water secretion tube. The scale is added, so that quantitative stirred slurry can be conveniently poured into the cavity between the pipe body and the bleeding pipe, and the test efficiency is improved.
Preferably, the filter screen is formed by stacking three layers of 200-400-mesh stainless steel filter screens.
Preferably, the filter screen is arranged in the middle of the side wall of the part of the bleeding pipe located in the pipe body. Through setting up the filter screen in the partial lateral wall middle part of bleeding pipe position in the body, this can more accurate obtain test data because if too design the filter screen, then because the pressure of upper portion thick liquid inside is less, so the bleeding volume is less, consequently will lead to test data to a bit smaller, and if too design the filter screen, then because the lower part thick liquid is less that excretes, consequently will lead to test data to a bit smaller.
Preferably, the height of the filter screen is 10-60 mm.
Preferably, the pressure gas is compressed air, the preset pressure value is 0.5-1.5MPa, the T1 is 5-15 minutes, and the T2 is 3-10 minutes.
Preferably, the technical scheme also comprises a water collecting container, and the water collecting container is positioned below the valve. The water collecting container is convenient for quickly collecting water secreted by the slurry into a water secretion pipe and is also convenient for quickly measuring the volume of the secreted water, so that the test efficiency is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the drainage pipe is additionally arranged in the pipe body, the filter screen is additionally arranged on the side wall of the part of the drainage pipe positioned in the pipe body, and the lower end of the drainage pipe is additionally provided with the valve; therefore, when the slurry with zero free bleeding rate is pressurized, because the valve is in a closed state, no pressure difference exists between the inside and the outside of the bleeding pipe, and the slurry is in a pressure state, so that the working condition of the slurry in actual construction is better met; meanwhile, for the slurry with the free bleeding rate not equal to zero, the filter screen is arranged on the side wall of the bleeding pipe instead of the bottom, so that the filter screen is not easy to block, and the test accuracy is improved;
2. the air inlet is arranged on the top surface of the upper end cover, and the compressed air quick connector is additionally arranged on the air inlet, so that the compressed air can be conveniently accessed, and the test efficiency is improved;
3. the bleeding pipe and the pipe body are designed to be coaxially arranged, so that a sedimentation layer formed by the slurry is prevented from being accumulated on a filter screen on the bleeding pipe, and the accuracy of the test is further improved;
4. the scale is added, so that quantitative stirred slurry can be conveniently poured into the cavity between the pipe body and the bleeding pipe, and the test efficiency is improved;
5. the filter screen is arranged in the middle of the side wall of the part of the bleeding pipe, which is positioned in the pipe body, so that test data can be obtained more accurately, because if the filter screen is designed too much, the test data is smaller because the pressure in the upper slurry is smaller, and the bleeding amount is smaller, and if the filter screen is designed too much, the test data is smaller because the lower slurry is less, and the test data is smaller;
6. the water collecting container is convenient for quickly collecting water secreted by the slurry into a water secretion pipe and is also convenient for quickly measuring the volume of the secreted water, so that the test efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pressure bleeding test instrument for a prestressed duct grouting material.
As shown in the figure: the device comprises a pipe body 1, an upper end cover 2, an air inlet 2a, a lower end cover 3, a bleeding pipe 4, a valve 5, a filter screen 6 and a water collecting container 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, an apparatus for testing pressure bleeding of a prestressed duct grouting material includes a pipe body 1 and an upper end cap 2 which are matched with each other, the upper end cover 2 is hermetically arranged on the upper end opening of the pipe body 1, an air inlet 2a is arranged on the upper end cover 2, the tube body 1 is a cylindrical structure with two open ends, the lower end opening of the tube body 1 is provided with a lower end cover 3 in a sealing way, the lower end cover 3 is provided with a water draining pipe 4, the upper end of the water draining pipe 4 is positioned in the pipe body 1, the lower end of the water draining pipe 4 penetrates through the lower end cover 3 in a sealing way and extends outwards, the lower end of the water draining pipe 4 is provided with a valve 5, it is located to secrete water pipe 4 be equipped with filter screen 6 on the lateral wall of the part in body 1, one side of filter screen 6 with secrete the inner chamber intercommunication of water pipe 4, filter screen 6 the opposite side with the inner chamber intercommunication of body 1. During the test, the valve 5 is closed and the upper end cover 2 is opened, then quantitative stirred slurry is filled into a cavity between the pipe body 1 and the bleeding pipe 4, then the upper end cover 2 is closed and kept still for T1 minutes, then pressure gas is introduced through the gas inlet 2a until the pressure in the pipe body 1 reaches a preset pressure value, after the preset pressure value is kept for T2 minutes, the pressure gas is stopped being introduced, the water collecting container 7 is placed below the valve 5, the valve 5 is opened to enable the bleeding in the bleeding pipe 4 to flow into the water collecting container 7, and finally the bleeding rate of the slurry can be calculated by measuring the volume of the bleeding flowing in the water collecting container 7. The drainage pipe 4 is additionally arranged in the pipe body 1, the filter screen 6 is additionally arranged on the side wall of the part of the drainage pipe 4 positioned in the pipe body 1, and the valve 5 is additionally arranged at the lower end of the drainage pipe 4; therefore, when the slurry with zero free bleeding rate is pressurized, because the valve 5 is in a closed state, no pressure difference exists between the inside and the outside of the bleeding pipe 4, and the slurry is in a pressure state, the slurry is more suitable for the working condition of the slurry in actual construction, under the condition, because no pressure difference exists, the moisture cannot continuously flow out through the filter screen 6, but the bled water flows into the bleeding pipe 4 through the filter screen 6, and the test accuracy is greatly improved; meanwhile, for the slurry with the free bleeding rate not equal to zero, the filter screen 6 is not easy to block because the filter screen 6 is arranged on the side wall of the bleeding pipe 4 instead of the bottom, thereby improving the accuracy of the test.
The air inlet 2a is arranged on the top surface of the upper end cover 2, and a compressed air quick connector is arranged on the air inlet 2 a. And sealing rings are arranged between the upper port of the pipe body 1 and the upper end cover 2 and between the lower port of the pipe body 1 and the lower end cover 3. Through setting up air inlet 2a on the top surface of upper end cover 2 to add on air inlet 2a and establish compressed air quick-operation joint, made things convenient for compressed air's access like this, improved test efficiency. The water drainage pipe 4 and the pipe body 1 are coaxially arranged. The body 1 is an organic glass tube, the wall thickness of the organic glass tube is greater than or equal to 5mm, and the water drainage tube 4 is a hard plastic tube. By designing the bleeding pipe 4 and the pipe body 1 to be coaxially arranged, a sedimentation layer formed by the slurry is prevented from being accumulated on the filter screen 6 on the bleeding pipe 4, so that the test accuracy is further improved.
The inner diameter of the tube body 1 is 35-50mm, specifically 40mm, the outer diameter of the water drainage tube 4 is 10-60mm, specifically 20mm, the length of the tube body 1 is 150-500mm, specifically 180mm, the length of the water drainage tube 4 is 100-300mm, specifically 170mm, and the height of the upper port of the water drainage tube 4 is smaller than the height of the upper port of the tube body 1. The side wall of the tube body 1 is provided with scales, and the scales are the volumes corresponding to the cavity between the tube body 1 and the water draining pipe 4. The maximum value of the scale is 250ml, and the scale is accurate to 0.2 ml. The scale is added, so that quantitative stirred slurry can be conveniently poured into the cavity between the pipe body 1 and the bleeding pipe 4, and the test efficiency is improved. The filter screen 6 is formed by stacking three layers of 200-400-mesh stainless steel filter screens, and in this embodiment, the filter screen 6 is a 325-mesh stainless steel filter screen. The filter screen 6 is arranged in the middle of the side wall of the part of the water draining pipe 4 positioned in the pipe body 1. The filter screen 6 is embedded in the water secretion pipe 4, and the filter screen and the water secretion pipe are of an integrated structure, certainly, a water secretion hole can be formed in the side wall of the water secretion pipe 4, and then the filter screen 6 is wrapped on the side wall of the water secretion pipe 4 to correspond to the position of the water secretion hole. Through setting up filter screen 6 in secreting the lateral wall middle part of water pipe 4 part that is located in body 1, can more accurate obtain test data like this, because if too with filter screen 6 design, then because the pressure of upper portion thick liquid inside is less, so the bleeding volume is less, consequently will lead to test data littleer, and if too with filter screen 6 design, then because the lower part thick liquid is less of secreting the water, so will lead to test data littleer. The height of the filter screen 6 is 10-60 mm. The area of the screen 6 can be designed to be consistent with the area of the screen in the original test instrument.
The pressure gas is compressed air, the preset pressure value is 0.5-1.5MPa, the T1 is 5-15 minutes, and the T2 is 3-10 minutes. The maximum pressure of the compressed air source is not lower than 0.8MPa, and a pressure gauge with the maximum reading value not lower than 1.0MPa and the minimum scale value of 0.02MPa is configured. Of course, other pressurized gases, such as nitrogen, may be used.
The technical scheme also comprises a water collecting container 7, wherein the water collecting container 7 is positioned below the valve 5. The volume of the water collecting container 7 is 10mL, and the division value is 0.2 mL. The water collecting container 7 is convenient for quickly collecting water secreted by the slurry into the water bleeding pipe 4 and also convenient for quickly measuring the volume of the secreted water, thereby improving the test efficiency.
During the test:
first, the valve 5 is closed and the upper end cap 2 is opened;
then, pouring 200ml of the stirred slurry into a cavity between the pipe body 1 and the bleeding pipe 4, and accurately obtaining 0.2 ml;
then, the upper end cover 2 is covered and vertically placed for 10 minutes;
then introducing pressure gas through the gas inlet 2a until the pressure in the pipe body 1 reaches a preset pressure value, and stopping introducing the pressure gas after keeping the preset pressure value for 5 minutes;
then placing a water collecting container 7 below the valve 5, and opening the valve 5 to make the water in the water bleeding pipe 4 flow into the water collecting container 7;
and finally, measuring the volume V1 of the bleeding water flowing into the water collecting container 7 to be accurate to 0.1mL, and calculating the bleeding rate of the slurry.
Bleeding rate MyiIs calculated as follows:
in the formula: myi-bleeding rate;
v1 — volume of collected bleeding in milliliters (ml);
and (3) taking values of experimental results: the arithmetic mean of the data of two parallel experiments (to the nearest 0.1%) should be taken as the result of the bleeding rate test.
In the embodiment, the water secretion pipe 4 is additionally arranged in the pipe body 1, the filter screen 6 is additionally arranged on the side wall of the part, located in the pipe body 1, of the water secretion pipe 4, and the valve 5 is additionally arranged at the lower end of the water secretion pipe 4; therefore, when the slurry with zero free bleeding rate is pressurized, because the valve 5 is in a closed state, no pressure difference exists between the inside and the outside of the bleeding pipe 4, and the slurry is in a pressure state, the slurry is more suitable for the working condition of the slurry in actual construction, under the condition, because no pressure difference exists, the moisture cannot continuously flow out through the filter screen 6, but the bled water flows into the bleeding pipe 4 through the filter screen 6, and the test accuracy is greatly improved; meanwhile, for the slurry with the free bleeding rate not equal to zero, the filter screen 6 is not easy to block because the filter screen 6 is arranged on the side wall of the bleeding pipe 4 instead of the bottom, thereby improving the accuracy of the test.
Meanwhile, in the embodiment, the air inlet 2a is arranged on the top surface of the upper end cover 2, and the compressed air quick connector is additionally arranged on the air inlet 2a, so that the access of compressed air is facilitated, and the test efficiency is improved; the bleeding pipe 4 and the pipe body 1 are designed to be coaxially arranged, so that a sedimentation layer formed by slurry is prevented from being accumulated on a filter screen 6 on the bleeding pipe 4, and the accuracy of the test is further improved; the scale is added, so that quantitative stirred slurry can be conveniently poured into the cavity between the pipe body 1 and the bleeding pipe 4, and the test efficiency is improved.
Moreover, in the present embodiment, the filter screen 6 is disposed in the middle of the sidewall of the portion of the water discharging pipe 4 located in the pipe body 1, so that the test data can be obtained more accurately, because if the filter screen 6 is designed too much, the amount of water discharged is smaller because the pressure inside the upper slurry is smaller, and thus the test data will be smaller, and if the filter screen 6 is designed too much, the amount of water discharged from the lower slurry is smaller, and thus the test data will be smaller; the water collecting container 7 is convenient for quickly collecting water secreted by the slurry into the water bleeding pipe 4 and also convenient for quickly measuring the volume of the secreted water, thereby improving the test efficiency.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a prestressing force pore canal grouting material pressure bleeding test instrument, includes body (1) and upper end cover (2) of mutually supporting, the sealed dress of upper end cover (2) is on the last port of body (1), be equipped with air inlet (2a) on upper end cover (2), its characterized in that, body (1) is both ends open-ended tubular structure, sealed the lid is equipped with lower end cover (3) on the lower port of body (1), be equipped with on lower end cover (3) and secrete water pipe (4), the upper end of secreting water pipe (4) is located in body (1), the lower extreme of secreting water pipe (4) is sealed to be run through lower end cover (3) and outwards extend, the lower extreme of secreting water pipe (4) is equipped with valve (5), secrete water pipe (4) are located be equipped with filter screen (6) on the partial lateral wall in body (1), one side of filter screen (6) with secrete water pipe's (4) inner chamber intercommunication, the other side of the filter screen (6) is communicated with the inner cavity of the pipe body (1).
2. The pressure bleeding test instrument for prestressed duct grouting material according to claim 1, wherein said air inlet (2a) is provided on the top surface of said upper end cover (2), and said air inlet (2a) is provided with a compressed air quick coupling.
3. The pressure bleeding test instrument for prestressed duct grouting material as claimed in claim 1, wherein said bleeding pipe (4) is arranged coaxially with said pipe body (1).
4. The pressure bleeding test instrument for the prestressed duct grouting material as claimed in claim 1, wherein the inner diameter of the tube body (1) is 35-50mm, the outer diameter of the water bleeding tube (4) is 10-60mm, the length of the tube body (1) is 150-500mm, the length of the water bleeding tube (4) is 100-300mm, and the height of the upper port of the water bleeding tube (4) is smaller than that of the upper port of the tube body (1).
5. The pressure bleeding test instrument for prestressed duct grouting material according to claim 1, wherein the side wall of the pipe body (1) is provided with a scale, and the scale is the volume corresponding to the cavity between the pipe body (1) and the bleeding pipe (4).
6. The pressure bleeding test instrument for prestressed duct grouting material as claimed in claim 1, wherein said filter screen (6) is formed by stacking three layers of 200-400 mesh stainless steel filter screens.
7. The pressure bleeding test instrument for prestressed duct grouting material as claimed in claim 1, wherein said filter screen (6) is disposed in the middle of the side wall of the portion of said bleeding pipe (4) located in said pipe body (1).
8. The pressure bleeding test instrument for prestressed duct grouting material as claimed in claim 1, wherein the height of said screen (6) is 10-60 mm.
9. The apparatus of claim 1, wherein the pressure gas is compressed air, the preset pressure value is 0.5-1.5MPa, the T1 is 5-15 minutes, and the T2 is 3-10 minutes.
10. The pressure bleeding test instrument for prestressed duct grouting material as claimed in claim 1, further comprising a water collection container (7), wherein said water collection container (7) is located below said valve (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011122901.XA CN112180071A (en) | 2020-10-20 | 2020-10-20 | Prestressed duct grouting material pressure bleeding test instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011122901.XA CN112180071A (en) | 2020-10-20 | 2020-10-20 | Prestressed duct grouting material pressure bleeding test instrument |
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| CN112180071A true CN112180071A (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113263624A (en) * | 2021-06-22 | 2021-08-17 | 王淑玲 | Concrete preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113263624A (en) * | 2021-06-22 | 2021-08-17 | 王淑玲 | Concrete preparation method |
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