CN111855526A - Device and method for detecting sludge filtering performance - Google Patents
Device and method for detecting sludge filtering performance Download PDFInfo
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- CN111855526A CN111855526A CN202010631996.1A CN202010631996A CN111855526A CN 111855526 A CN111855526 A CN 111855526A CN 202010631996 A CN202010631996 A CN 202010631996A CN 111855526 A CN111855526 A CN 111855526A
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- 238000001914 filtration Methods 0.000 title claims abstract description 59
- 239000010802 sludge Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title abstract description 25
- 239000000706 filtrate Substances 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000000523 sample Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding 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
-
- 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
- G01N2015/084—Testing filters
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a device and a method for detecting sludge filtering performance, and the device comprises a filtering funnel, a positioning disc, a base and a timer display screen, wherein a filtering medium is fixedly connected to an inner cavity of the filtering funnel. According to the device and the method for detecting the sludge filtering performance, the filtering performance of sludge is reflected by measuring the time for filtering a certain volume of sludge filtrate, the certain volume of sludge is taken during detection and poured into a filtering funnel with a filtering medium, the sludge filtrate can flow into a filtrate measuring cup through a filtrate diversion trench, a timing system can automatically measure the time required for filtering the certain volume of filtrate, and the filtering performance of the sludge can be conveniently judged according to the time. The method has the advantages of being high in detection accuracy, simple and easy to operate, small in size, convenient to carry, simple in structure, fast to assemble, low in maintenance cost and the like, and greatly improving the detection efficiency of the sludge filtering performance.
Description
Technical Field
The invention relates to the technical field of sludge dewatering, in particular to a device and a method for detecting sludge filtering performance.
Background
Sludge is a product of sewage treatment, and is an extremely complex heterogeneous body consisting of organic debris, bacterial cells, inorganic particles, colloids, sludge and the like. The main characteristics of the sludge are high water content, high organic matter content, easy decomposition and stink generation, fine particles, small specific gravity and colloidal liquid state. It is a thick matter between liquid and solid and can be transported by a pump, but it is difficult to perform solid-liquid separation by sedimentation.
The existing method for detecting the filtering performance of the sludge mainly comprises the step of measuring the capillary water absorption time or the specific resistance of the sludge. The method for measuring the capillary water absorption time of the sludge is excellent in the aspect of detecting the filtering performance of the sludge with less free water, not only has high speed, but also has high accuracy, but for the sludge with more free water, as the sludge has more water and the capillary diffusion speed is very high, if the method is used for detecting the filtering performance of the sludge, the detected capillary water absorption time is not greatly different, and the guiding significance is lost; the method for measuring the specific resistance of the sludge has a good detection effect on the sludge containing more free moisture or the sludge containing less free moisture, but the method needs a complicated device, is difficult to build and inconvenient to carry, and in addition, the method has a complicated operation process.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a device and a method for detecting the sludge filtering performance, and solves the problems of complex required device, difficult construction, inconvenient carrying and complicated operation process.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a detection apparatus and method of mud filtration performance, includes filter funnel, positioning disk, base and time-recorder display screen, filter funnel's inner chamber fixedly connected with filter medium, filter funnel places in the top of positioning disk, the below intercommunication of positioning disk has the filtrating metering cup, filtrating guiding gutter has been seted up to the lateral wall of filtrating metering cup, the lateral wall fixedly connected with time-recorder probe of filtrating metering cup, the top of base is fixed in to the filtrating metering cup, the time-recorder probe passes through wire and time-recorder display screen electric connection.
Preferably, filter funnel comprises the triplex, and upper portion is vertical trend cylinder structure, and the middle part is the back taper structure, and the sub-unit connection funnel neck of bending, filter funnel's funnel neck middle part is 45 contained angles with the horizontal direction, and the lower part is vertical trend, and the lower part top is handled into the bevel connection form, filter funnel's bevel connection is 45 contained angles with the horizontal direction, filter funnel's bevel connection most advanced with the contact of the cup wall of filtrating metering cup, and be located the filtrating guiding gutter in.
Preferably, the filter medium is located at the bottom of the cylindrical structure of the filter funnel and comprises a support ring and a filter screen, the edge part of the filter screen of the filter medium is cast inside the support ring of the filter medium, and a rubber ring tightly attached to the inner wall of the bottom of the cylindrical structure of the filter funnel is arranged on the outer side of the support ring of the filter medium.
Preferably, the filter screen of the filter funnel is made of a steel wire mesh, a non-woven fabric or a material with a rapid filtering effect.
Preferably, the positioning disc comprises an upper piece and a lower piece, the upper piece of the positioning disc is connected with the inverted cone structure in the middle of the filtering funnel through a screw thread, the lower piece of the positioning disc is connected with the top of the filtrate measuring cup through a screw thread, two protruding positioning columns are arranged on the upper piece of the positioning disc, positioning holes corresponding to the positions of the positioning columns are formed in the lower piece of the positioning disc, the two positioning holes are formed, and the inner diameter of each positioning hole is matched with the outer diameter of each positioning column.
Preferably, the filtrate measuring cup is a transparent cylinder with scales marked on the outer wall.
Preferably, the inner diameter of the filtrate diversion trench is matched with the lower part of a funnel neck of the filter funnel.
Preferably, the base is oval in shape.
Preferably, the probe is made of metal, 3 probes are arranged on the wall of the filtrate measuring cup, and one end of the probe penetrates through the outer wall of the filtrate measuring cup and extends to the inner cavity of the filtrate measuring cup.
The invention also discloses a detection method of the detection device for the sludge filtration performance, which comprises the following steps:
step one, preparation step: measuring sludge with a fixed volume, and pouring the sludge into a filter funnel;
step two, filtering: the sludge filtrate passes through the filter medium, flows out of the filter funnel through a funnel neck in the filter funnel, and then flows into a filtrate measuring cup along a filtrate diversion groove;
step three, timing: when the filtrate liquid level in the filtrate measuring cup contacts with a middle timer probe of the timer, the timer starts to time, meanwhile, a timer display screen starts to accumulate time from 0, when the filtrate liquid level contacts with an upper timer probe, the timer stops timing, and the final time is displayed on the timer display screen;
step four, performance measurement and calculation: the filtration performance of the sludge was judged by the length of time it took to filter a volume of filtrate.
(III) advantageous effects
The invention provides a device and a method for detecting sludge filtering performance. Compared with the prior art, the method has the following beneficial effects:
The device and the method for detecting the sludge filtering performance are characterized in that a filtering medium is fixedly connected with an inner cavity of a filtering funnel, the filtering funnel is placed at the top of a positioning disc, a filtrate metering cup is communicated with the lower part of the positioning disc, a filtrate diversion trench is formed in the side wall of the filtrate metering cup, a timer probe is fixedly connected with the side wall of the filtrate metering cup, the filtrate metering cup is fixed at the top of a base, the timer probe is electrically connected with a timer display screen through a lead, the filtering performance of the sludge can be reflected by measuring the time for filtering a certain volume of sludge filtrate, a certain volume of sludge is taken during detection and poured into a filtering funnel with a filtering medium, the sludge filtrate can flow into a filtrate measuring cup through a filtrate diversion trench, the time required for filtering the certain volume of filtrate can be automatically measured by a timing system, and the filtering performance of the sludge can be conveniently judged by the time. The method has the advantages of being high in detection accuracy, simple and easy to operate, small in size, convenient to carry, simple in structure, fast to assemble, low in maintenance cost and the like, and greatly improving the detection efficiency of the sludge filtering performance.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, 1-filter funnel, 2-filter medium, 3-positioning disc, 4-positioning column, 5-positioning hole, 6-filtrate measuring cup, 7-filtrate diversion trench, 8-base, 9-timer probe and 10-timer display screen.
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, an embodiment of the present invention provides a technical solution: a device and a method for detecting sludge filtration performance comprise a filter funnel 1, a positioning disc 3, a base 8 and a timer display screen 10, wherein a filter medium 2 is fixedly connected to an inner cavity of the filter funnel 1, the filter funnel 1 is placed at the top of the positioning disc 3, a filtrate metering cup 6 is communicated below the positioning disc 3, a filtrate diversion trench 7 is formed in the side wall of the filtrate metering cup 6, a timer probe 9 is fixedly connected to the side wall of the filtrate metering cup 6, the filtrate metering cup 6 is fixed at the top of the base 8, the timer probe 9 is electrically connected with the timer display screen 10 through a lead, the filter funnel 1 is composed of three parts, the upper part of the filter funnel is of a vertical-trend cylindrical structure, the middle part of the filter funnel is of an inverted cone structure, the lower part of the filter funnel neck is connected with a bent-shaped funnel neck, the middle part of the funnel neck forms an included angle of 45 degrees with the horizontal direction, the lower part of the filter funnel neck is, the inclined opening tip of the filter funnel 1 is contacted with the cup wall of the filtrate measuring cup 6 and is positioned in a filtrate diversion trench 7, the filter medium 2 is positioned at the bottom of the cylindrical structure of the filter funnel 1 and consists of a supporting ring and a filter screen, the edge part of the filter screen of the filter medium 2 is cast inside the supporting ring of the filter medium 2, the outer side of the supporting ring of the filter medium 2 is provided with a rubber ring which is tightly attached to the inner wall of the bottom of the cylindrical structure of the filter funnel 1, the filter screen of the filter funnel 1 is made of a steel wire mesh, non-woven fabric or a material with a quick filtering effect, the positioning disc 3 consists of an upper sheet and a lower sheet, the upper sheet of the positioning disc 3 is connected with the middle inverted cone structure of the filter funnel 1 through a screw thread, the lower sheet of the positioning disc 3 is connected with the top of the filtrate measuring cup 6 through a screw thread, the upper sheet of the, set up on the lower piece of positioning disk 3 and set up the locating hole 5 corresponding with the position of reference column 4, locating hole 5 is provided with two, the internal diameter of locating hole 5 and the external diameter adaptation of reference column 4, filtrating metering cup 6 is the transparent cylindric thing that the outer wall has the scale, the internal diameter of filtrating guiding gutter 7 and the funnel neck lower part adaptation of filtering funnel 1, the shape of base 8 is oval, probe 9 is the metal material, probe 9 is provided with 3 on the cup wall of filtrating metering cup 6, the one end of probe 9 runs through the outer wall of filtrating metering cup 6 and extends to the inner chamber of filtrating metering cup 6.
The invention also discloses a detection method of the detection device for the sludge filtration performance, which comprises the following steps:
step one, preparation step: measuring sludge with a fixed volume, and pouring the sludge into a filter funnel 1;
step two, filtering: the sludge filtrate passes through the filter medium 2, flows out of the filter funnel 1 through the funnel neck of the filter funnel 1, and then flows into the filtrate measuring cup 6 along the filtrate diversion trench 7;
step three, timing: when the filtrate liquid level in the filtrate measuring cup 6 contacts the middle timer probe 9 of the timer, the timer starts to time, meanwhile, the timer display screen 10 starts to accumulate time from 0, when the filtrate liquid level contacts the upper timer probe 9, the timer stops timing, and the final time is displayed on the timer display screen 10;
step four, performance measurement and calculation: the filtration performance of the sludge was judged by the length of time it took to filter a volume of filtrate.
And those not described in detail in this specification are well within the skill of those in the art.
In the description of the invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a detection apparatus for mud filtration performance which characterized in that: including filtering funnel (1), positioning disk (3), base (8) and time-recorder display screen (10), the inner chamber fixedly connected with filter medium (2) of filtering funnel (1), place in the top of positioning disk (3) filtering funnel (1), the below intercommunication of positioning disk (3) has filtrating metering cup (6), filtrating guiding gutter (7) have been seted up to the lateral wall of filtrating metering cup (6), the lateral wall fixedly connected with time-recorder probe (9) of filtrating metering cup (6), the top of base (8) is fixed in filtrating metering cup (6), time-recorder probe (9) are through wire and time-recorder display screen (10) electric connection.
2. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: filter funnel (1) and constitute by the triplex, and upper portion is vertical trend cylindrical structure, and the middle part is the back taper structure, and the sub-unit connection form funnel neck of bending, the funnel neck middle part and the horizontal direction of filter funnel (1) are 45 contained angles, and the lower part is vertical trend, and the lower part top is handled into the bevel connection form, the bevel connection and the horizontal direction of filter funnel (1) are 45 contained angles, the bevel connection point of filter funnel (1) with the cup wall contact of filtrating metering cup (6), and be located filtrating guiding gutter (7) in.
3. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the filter medium (2) is located the bottom of filter funnel (1) cylindrical structure comprises support ring and filter screen, the filter screen edge part founding of filter medium (2) in inside filter medium (2) support ring, the support ring outside of filter medium (2) is provided with the rubber circle of closely laminating with the bottom inner wall of filter funnel (1) cylindrical structure.
4. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the filter screen of the filter funnel (1) is made of a steel wire mesh, non-woven fabrics or materials with a rapid filtering effect.
5. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the utility model discloses a filter funnel, including positioning disc (3), filter funnel (1), locating disc (3) are by upper and lower two and constitute, the last piece of positioning disc (3) pass through the screw thread with the middle part back taper structure of filter funnel (1) links to each other, the lower piece of positioning disc (3) pass through the screw thread with the top of filtrating metering cup (6) links to each other, be provided with two reference column (4) of form of protruding on the last piece of positioning disc (3), set up on the lower piece of positioning disc (3) and correspond locating hole (5) with the position of reference column (4), locating hole (5) are provided with two, the internal diameter of locating hole (5) and the external diameter adaptation of reference column (4).
6. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the filtrate measuring cup (6) is a transparent cylinder with scales marked on the outer wall.
7. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the inner diameter of the filtrate diversion trench (7) is matched with the lower part of the funnel neck of the filter funnel (1).
8. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the base (8) is oval.
9. The apparatus for detecting the filtering performance of sludge according to claim 1, wherein: the probe (9) is made of metal, 3 probes are arranged on the wall of the filtrate measuring cup (6) of the probe (9), and one end of the probe (9) penetrates through the outer wall of the filtrate measuring cup (6) and extends to the inner cavity of the filtrate measuring cup (6).
10. The apparatus for detecting the filtering performance of sludge according to any one of the claims 1 to 9, wherein: the detection method comprises the following steps:
step one, preparation step: measuring sludge with a fixed volume, and pouring the sludge into a filter funnel (1);
step two, filtering: the sludge filtrate passes through the filter medium (2), flows out of the filter funnel (1) through the funnel neck of the filter funnel (1), and then flows into the filtrate measuring cup (6) along the filtrate diversion trench (7);
Step three, timing: when the filtrate liquid level in the filtrate measuring cup (6) contacts with a middle timer probe (9) of a timer, the timer starts to time, meanwhile, a timer display screen (10) starts to accumulate time from 0, when the filtrate liquid level contacts with an upper timer probe (9), the timer stops timing, and the final time is displayed on the timer display screen (10);
step four, performance measurement and calculation: the filtration performance of the sludge was judged by the length of time it took to filter a volume of filtrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010631996.1A CN111855526A (en) | 2020-07-03 | 2020-07-03 | Device and method for detecting sludge filtering performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010631996.1A CN111855526A (en) | 2020-07-03 | 2020-07-03 | Device and method for detecting sludge filtering performance |
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| CN111855526A true CN111855526A (en) | 2020-10-30 |
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| CN202010631996.1A Pending CN111855526A (en) | 2020-07-03 | 2020-07-03 | Device and method for detecting sludge filtering performance |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288525A (en) * | 2011-05-09 | 2011-12-21 | 中国科学技术大学苏州研究院 | Device and method for testing filtration resistance of coarse mesh filtration membrane in dynamic membrane bioreactor |
| CN203011880U (en) * | 2012-09-19 | 2013-06-19 | 许宝庆 | Capacitive automatic determinator of sludge specific resistance |
| CN203164177U (en) * | 2013-03-29 | 2013-08-28 | 陕西科技大学 | Dynamic drainage jar |
| CN204514911U (en) * | 2015-01-19 | 2015-07-29 | 无锡国联环保科技有限公司 | A kind of sludge specific resistance measurement mechanism |
| CN106990017A (en) * | 2017-05-19 | 2017-07-28 | 河南工程学院 | Automate sludge specific resistance measurement device and assay method |
| CN206906179U (en) * | 2017-05-22 | 2018-01-19 | 合肥工业大学 | A kind of vapour-pressure type sludge specific resistance measurement device |
| CN210322684U (en) * | 2019-06-27 | 2020-04-14 | 中交第二航务工程局有限公司 | Clamping groove type V-shaped funnel for measuring working performance of self-compacting concrete mixture |
| CN111175172A (en) * | 2018-11-09 | 2020-05-19 | 中国市政工程中南设计研究总院有限公司 | Device for measuring specific resistance parameter of sludge, use method and application thereof |
-
2020
- 2020-07-03 CN CN202010631996.1A patent/CN111855526A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288525A (en) * | 2011-05-09 | 2011-12-21 | 中国科学技术大学苏州研究院 | Device and method for testing filtration resistance of coarse mesh filtration membrane in dynamic membrane bioreactor |
| CN203011880U (en) * | 2012-09-19 | 2013-06-19 | 许宝庆 | Capacitive automatic determinator of sludge specific resistance |
| CN203164177U (en) * | 2013-03-29 | 2013-08-28 | 陕西科技大学 | Dynamic drainage jar |
| CN204514911U (en) * | 2015-01-19 | 2015-07-29 | 无锡国联环保科技有限公司 | A kind of sludge specific resistance measurement mechanism |
| CN106990017A (en) * | 2017-05-19 | 2017-07-28 | 河南工程学院 | Automate sludge specific resistance measurement device and assay method |
| CN206906179U (en) * | 2017-05-22 | 2018-01-19 | 合肥工业大学 | A kind of vapour-pressure type sludge specific resistance measurement device |
| CN111175172A (en) * | 2018-11-09 | 2020-05-19 | 中国市政工程中南设计研究总院有限公司 | Device for measuring specific resistance parameter of sludge, use method and application thereof |
| CN210322684U (en) * | 2019-06-27 | 2020-04-14 | 中交第二航务工程局有限公司 | Clamping groove type V-shaped funnel for measuring working performance of self-compacting concrete mixture |
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Application publication date: 20201030 |