CN113125338A - Quantitative testing device and method for cohesive force between pervious concrete aggregate and slurry - Google Patents
Quantitative testing device and method for cohesive force between pervious concrete aggregate and slurry Download PDFInfo
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- 239000002002 slurry Substances 0.000 title claims abstract description 98
- 239000011380 pervious concrete Substances 0.000 title claims abstract description 85
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005303 weighing Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 8
- 238000005204 segregation Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004642 transportation engineering Methods 0.000 claims description 3
- 238000012113 quantitative test Methods 0.000 claims 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100184147 Caenorhabditis elegans mix-1 gene Proteins 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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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
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- G01N33/383—Concrete or cement
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a quantitative testing device and method for cohesive force between pervious concrete aggregate and slurry. This patent proposes the cohesion index of test pervious concrete aggregate and slurry for the first time for judge whether pervious concrete can adopt the production of ready-mixed mode and long distance transportation. The testing principle of the device related to the patent of the invention is as follows: weighing a proper amount of fresh pervious concrete into a screen drum, continuously and slowly increasing the rotating speed, and when slurry begins to be centrifuged, based on the rotating speed and a formula Fcf=mp1×ω1 2And (4) calculating the force value by the x r, namely the cohesive force between the pervious concrete aggregate and the slurry. Adapted for ready-mix mode production and long-distance transportRecommended range of cohesion: the initial cohesion between the aggregate and the slurry is preferably 20-100N, and the cohesion within 3h should not be increased to 150N.
Description
Technical Field
The invention belongs to the technical field of pervious concrete performance testing, and particularly relates to a quantitative testing device for cohesive force between pervious concrete aggregate and slurry and a method for testing the cohesive force between the aggregate and the slurry by using the device.
Background
With the advance of sponge city construction work in China, pervious concrete is increasingly applied to places such as non-motor vehicles, parking lots, landscape platforms and the like. The pervious concrete has the characteristics of low water-cement ratio, less slurry consumption, high internal communication porosity and the like, so that the freshly mixed pervious concrete is extremely easy to dehydrate and the workability is rapidly deteriorated, and the pervious concrete only has short construction time. The characteristics restrict the construction of pervious concrete, and the pervious concrete mostly adopts a field mixing mode, so that the characteristics of great urban pollution, urban noise, low working efficiency and the like are brought.
In the production process of the premixing mode, the loading and unloading materials and the pouring construction of the concrete are required to have certain fluidity, and in addition, the phenomena of slurry sinking, aggregate segregation and the like are easily caused by bumping and vibration in the transportation process, so that the strength or the water permeability of the concrete cannot meet the design index. It can be seen that the cohesive force between the pervious concrete aggregate and the slurry is a key to restrict whether the pervious concrete aggregate can be produced in a premixing mode on a large scale: the excessive cohesive force often causes the lubricating effect of slurry among aggregates to be small, and the fluidity of newly-mixed pervious concrete is too small, so that the loading and unloading and pouring construction are influenced; too low cohesion often leads to slurry sinking easily and aggregate segregation.
In conclusion, after the pervious concrete is mixed and before construction, the cohesive force between the aggregate and the slurry is preferably in a proper range: the initial cohesion after mixing can not be too big in order to guarantee smooth loading, and initial cohesion can not be too big simultaneously in order to guarantee to possess certain anti slurry and sink during the transportation, aggregate segregation ability, and the cohesion between aggregate and the slurry can not be too big in order to make things convenient for subsequent construction when unloading.
At present, no article, patent and standard exists for directly testing the cohesive force between aggregate and slurry of pervious concrete so as to judge whether the pervious concrete can be produced by adopting a premixing mode. The existing methods for evaluating the workability of the pervious concrete mainly comprise the following steps: empirical observation, wib consistency, slurry fluidity and slurry rheology.
The experience observation method is used for judging the performance of the freshly mixed pervious concrete by 'conglomerating by holding with hands and not flowing slurry', and the method is not greatly influenced by artificial subjective factors.
The Weibo consistency method is that a slump cone is arranged on a vibrating table and filled with newly-mixed pervious concrete, and a transparent disc with the diameter of 230mm +/-2 mm is placed on the top surface of the concrete mixture after the slump cone is lifted; starting the vibration table until the bottom surface of the transparent disc is fully distributed with cement paste, and representing the working performance of the pervious concrete by vibration time; because the vibration mode is different from the actual vibration mode, the relevance of the test result and the actual situation is poor.
The slurry fluidity method and the slurry rheological property method are used for testing the fluidity or rheological property of the slurry, and the relationship with the appearance form of the freshly mixed pervious concrete is established, so that the working performance of the freshly mixed concrete is improved; the method neglects that the freshly mixed pervious concrete mainly comprises slurry and aggregate, and the cohesive force and the time-varying property between the aggregate of the pervious concrete and the slurry are key indexes influencing the working performance of the pervious concrete, and is also the key for judging whether the pervious concrete can be produced by premixing.
Disclosure of Invention
The invention provides a quantitative testing device and a testing method for cohesive force between pervious concrete aggregate and slurry, wherein the testing device quantitatively tests the cohesive force between the aggregate and the slurry and can obtain time-varying data.
The invention relates to a quantitative testing device for cohesive force between pervious concrete aggregate and slurry, which comprises a material forming device, a speed-adjustable screening system, a vibration slurry-collecting weighing system and a control system.
The material forming device mainly refers to a screen drum.
The speed-adjustable screening system comprises an outer cylinder, a rotating motor with adjustable rotating speed, a transmission shaft, a belt wheel, a V-belt, a large working disc, a positioning rod, a base and a rear cover plate,
the screen drum is buckled above the large working disc; the positioning rod is fixed at the top of the large working disc; the screen drum is conveniently disassembled and assembled with the large working disc through the positioning rod; the base is positioned below the device, one side of the rotating motor is provided with a rear cover plate, and the other side of the rotating motor is provided with the vibration slurry collecting device; the rotating motor with the adjustable rotating speed is connected with a belt wheel through a V-belt, the belt wheel drives the large working disc to rotate through a transmission shaft, and the rotating motor with the adjustable rotating speed and the transmission shaft are fixed on the base;
the vibration slurry collecting and weighing system mainly comprises an outer cylinder, an electromagnetic vibrator, a discharging device, a small bucket and a weighing device; the outer cylinder surrounds the sieve barrel, and a gap is formed between the outer cylinder and the sieve barrel; the electromagnetic oscillation instrument is located the urceolus upper portion outside, discharging device is located the inboard lower part of urceolus, and the discharging device top is the work big dish, discharging device is slope form, and the slope bottom stretches out the part of urceolus is the discharge gate, and the discharge gate ejection of compact falls into the keg, weighs with weighing device.
The control system mainly refers to a control box.
The control system can start or stop the rotating motor and adjust the rotating speed of the rotating motor by the control box, and the control box can also start or stop the electromagnetic oscillation instrument.
The screen cylinder is a cylindrical uncovered stainless steel cylinder, the inner diameter of the screen cylinder is 200mm, and the wall thickness of the screen cylinder is 2 mm. The bottom is provided with four fixed holes with the diameter of 10mm, the center of the screen drum is provided with one screen drum, and the other three screen drums are uniformly distributed on a concentric circle with the diameter of 150 mm. The side wall of the screen cylinder is provided with a circular hole with the diameter of 2mm, the circular hole is distributed in a close packing manner, and the distance between the two holes is 1 mm.
The working large disc is arranged on the transmission shaft, and the diameter of the working large disc is consistent with the inner diameter of the screen drum.
Four positioning rods are arranged on the large working disc, one positioning rod is arranged at the center, and three positioning rods are uniformly distributed on a concentric circle of 150 mm; the diameter is 10mm and the height is 10 mm.
The three locating levers of work dish outer lane press close to the big dish surface of work, along clockwise opening have 5mm wide, 2mm thick draw-in grooves, the draw-in groove is used for fixed sieve bucket.
The quantitative testing device and method for cohesive force between pervious concrete aggregate and slurry comprise the following operation steps:
(1) wet hair is used for wiping the screen cylinder, the working large disc, the outer cylinder and the discharge hole, but no obvious water drop is ensured inside;
(2) placing the screen cylinder on the large working disc, twisting the screen cylinder anticlockwise (the radius r is 100mm), and clamping the screen cylinder into a clamping groove of a positioning rod at the upper part of the large working disc;
(3) weighing 2kg of freshly-mixed pervious concrete, placing the freshly-mixed pervious concrete into a screen drum, and distributing the mixture in the screen drum as much as possible in order to avoid excessive vibration of a machine during rotation; calculating the total amount m of the slurry according to the mixing proportion of the concretep1；
(4) The rotating motor is started by the control box to gradually and slowly increase the rotating speed, and when slurry begins to be thrown out of the side wall of the screen drum, the rotating speed at the moment is recorded as omega1(ii) a Continuously increasing the rotating speed to omega2Maintaining for 2min at 100r/min, and then gradually reducing the rotating speed and turning off the rotating motor;
(5) the electromagnetic oscillation instrument is started through the control box, the electromagnetic oscillation instrument is maintained for 1-2 min until all the slurry in the outer barrel flows out of the discharge port, the slurry is collected by the small barrels, and the weighing device is used for weighing mp2；
(6) And twisting the screen drum clockwise, taking the screen drum out of the clamping groove of the positioning rod, and cleaning the screen drum, the working large disc, the outer drum, the discharge port and the like.
The calculation formula of the cohesive force between the pervious concrete aggregate and the slurry is Fcf＝mp1×ω1 2Xr, in order to meet the requirements of material loading and unloading required in the pre-mixing production process and the slurry sinking resistance and aggregate segregation resistance in the transportation process, the initial cohesive force between the aggregate and the slurry is preferably 20-100N, and the cohesive force within 3h should not be increased to 150N.
Slurry separation rateIs calculated by the formula PS＝mp2/mp1×100％；ω2Under the condition of the rotating speed (100r/min), the slurry precipitation rate can be used for evaluating the premixing performance of the pervious concrete, and the slurry precipitation rate of the pervious concrete suitable for being produced in a premixing mode is 20-40%; when the slurry precipitation rate is 0-20%, the pervious concrete is too poor in workability and cannot be loaded or unloaded; when the slurry precipitation rate is 40-100%, slurry sinking and aggregate segregation are easy to occur in the pervious concrete in the transportation engineering.
Compared with other prior art, this patent has following apparent advantage:
(1) this patent proposes the cohesion index of test pervious concrete aggregate and slurry for the first time to judge whether pervious concrete can adopt the ready-mixed mode to produce.
(2) This patent has given the cohesion testing arrangement and the test method between pervious concrete aggregate and slurry to the recommended scope has been given: the initial cohesion between the aggregate and the slurry is preferably 20-100N, and the cohesion within 3h should not be increased to 150N.
Drawings
FIG. 1 is a quantitative measurement apparatus for cohesive force between pervious concrete aggregate and slurry according to the present invention;
FIG. 2 is a front view of the apparatus of the present invention (without the screen cylinder);
FIG. 3 is a top view of an apparatus according to the present invention;
fig. 4 is a bottom view of the device according to the present patent.
The specific labels in FIGS. 1-4 are: 1. a control box; 2. an electromagnetic oscillator; 3. a screen cylinder; 4. an outer cylinder; 5. positioning a rod; 6. a working large plate; 7. a drive shaft; 8. a discharge port; 9. a pulley; 10. a base; 11. a rotation motor with adjustable rotation speed; 12. a rear cover plate; 13. v-belt.
Detailed Description
The present invention is further illustrated by the following figures and examples, which are set forth to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to be limiting in any way.
As shown in figure 1, the invention discloses a quantitative testing device for cohesive force between pervious concrete aggregate and slurry, which comprises a material forming device, a speed-adjustable screening system, a vibration slurry-collecting weighing system and a control system. The finished product device mainly refers to a screen drum 3, the speed-adjustable screening system mainly comprises a rotating motor 11 with an adjustable rotating speed, a transmission shaft 7, a belt wheel 9, a V-belt 13, a working large disc 6, a positioning rod 5, a base 10 and a rear cover plate 12, the vibration pulp collecting weighing system mainly comprises an outer drum 4, an electromagnetic oscillator 2, a discharge port 8, a small bucket and a weighing device, and the control system mainly refers to a control box 1.
The material forming device mainly refers to a screen drum 3, and is conveniently disassembled and assembled with a large working disc 6 through four positioning rods 5;
in the speed-adjustable screening system, a rotating motor 11 with adjustable rotating speed is connected with a belt wheel 9 through a V-belt 13, the belt wheel drives a large working disc 6 to rotate through a transmission shaft 7, and the rotating motor 11 with adjustable rotating speed and the transmission shaft 7 are fixed on a base 10;
the electromagnetic oscillation instrument 2 of the vibration slurry collecting weighing system is arranged on the outer cylinder 4;
the control system, the control box 1 can start and stop the rotation motor 11, adjust the rotating speed of the rotation motor 11, and start and stop the electromagnetic oscillation instrument 2.
The screen cylinder 3 is a cylindrical uncovered stainless steel cylinder with the inner diameter of 200mm and the wall thickness of 2 mm. The bottom is provided with four fixed holes with the diameter of 10mm, the center of the screen drum 3 is provided with one, and the other three fixed holes are uniformly distributed on a concentric circle with the diameter of 150 mm. The side wall of the screen drum 3 is provided with a circular hole with the diameter of 2mm, the circular hole is distributed in a close packing way, and the distance between the two holes is 1 mm.
The large working disc 6 is arranged on the transmission shaft 7, and the diameter of the large working disc 6 is consistent with the inner diameter of the screen drum 3. Four positioning rods 5 are arranged on the working large disc 6, one positioning rod is arranged at the center, and three positioning rods are uniformly distributed on a concentric circle of 150 mm; the diameter is 10mm, and is high for 10mm, and three locating lever 5 in outer lane is pressed close to the big dish 6 surface of work and is the position, opens the draw-in groove that has 5mm width, 2mm thick along clockwise.
The quantitative testing device and method for cohesive force between pervious concrete aggregate and slurry comprise the following operation steps:
(1) wet hair is used for wiping the screen cylinder 3, the working large disc 6, the outer cylinder 4 and the discharge hole 8, but no obvious water drop is ensured inside;
(2) placing the screen cylinder 3 on the large working disc 6, twisting the screen cylinder 3 anticlockwise (the radius r is 100mm), and clamping the screen cylinder 3 into a clamping groove of a positioning rod 5 at the upper part of the large working disc 6;
(3) weighing a proper amount of 2kg of freshly-mixed pervious concrete, placing the freshly-mixed pervious concrete into a screen drum 3, and distributing the mixture in the screen drum 3 as much as possible in order to avoid excessive vibration of a machine during rotation; calculating the total amount m of the slurry according to the mixing proportion of the concretep1；
(4) The rotating motor 11 is started by the control box 1 to gradually and slowly increase the rotating speed, when slurry begins to be thrown out of the side wall of the screen drum 3, the rotating speed at the moment is recorded as omega1(ii) a Continuously increasing the rotating speed to omega2Maintaining for 2min at 100r/min, then gradually reducing the rotation speed and turning off the rotating motor 11;
(5) starting the electromagnetic oscillation instrument 2 through the control box 1, maintaining for 1-2 min until all the slurry in the outer barrel 4 flows out from the discharge port 8, collecting the slurry by using a small barrel, and weighing m by using a weighing devicep2；
(6) And (3) twisting the screen drum 3 clockwise, taking the screen drum 3 out of the clamping groove of the positioning rod 5, and cleaning the screen drum 3, the working large disc 6, the outer drum 4, the discharge hole 8 and the like.
The calculation formula of the cohesive force between the pervious concrete aggregate and the slurry is Fcf＝mp1×ω1 2Xr, in order to meet the requirements of material loading and unloading required in the pre-mixing production process and the slurry sinking resistance and aggregate segregation resistance in the transportation process, the initial cohesive force between the aggregate and the slurry is preferably 20-100N, and the cohesive force within 3h should not be increased to 150N. Omega2The slurry separation rate (P) is under the condition of the rotating speed (100r/min)S＝mp2/mp1X 100%) can be used for evaluating the premixing performance of the pervious concrete, 20-40% represents better premixing performance, the workability of the pervious concrete is too poor at 0-20% and the loading and unloading materials are not easy, and slurry sinking and aggregate segregation are easy to occur in the pervious concrete during transportation engineering at 40-100%.
It is obvious that the above examples are only for the purpose of clearly illustrating the testing device, and are not intended to limit the embodiments of the present invention. It will be apparent to those skilled in the art that other variations or modifications can be made based on the above description, such as changing the inner diameter of the screen cylinder 3, the size and distribution of the side wall slurry holes, the number, shape and size of the positioning rods 5, etc. The core of the device related to the patent is that the pervious concrete slurry inside the screen drum is gradually separated from the aggregate in a mode of gradually and slowly increasing the rotating speed of the screen drum, and the centrifugal force corresponding to the moment of starting separation is the cohesive force between the pervious concrete aggregate and the slurry, so as to judge whether the pervious concrete can be produced in a premixing mode and transported for a long distance. It is therefore contemplated that obvious variations or modifications may be made without departing from the spirit or scope of the invention.
Example 1:
blending pervious concrete according to Mix1 Mix proportion in table 1, determining initial cohesive force between pervious concrete aggregate and slurry and a result after standing for 3h by adopting each step in a specific implementation mode, and determining slurry precipitation rate under the condition of rotating speed of 100r/min at two times.
Example 2:
blending pervious concrete according to Mix2 Mix proportion in table 1, determining initial cohesive force between pervious concrete aggregate and slurry and a result after standing for 3h by adopting each step in a specific implementation mode, and determining slurry precipitation rate under the condition of rotating speed of 100r/min at two times.
Example 3:
blending pervious concrete according to Mix3 Mix proportion in table 1, determining initial cohesive force between pervious concrete aggregate and slurry and a result after standing for 3h by adopting each step in a specific implementation mode, and determining slurry precipitation rate under the condition of rotating speed of 100r/min at two times.
Example 4:
blending pervious concrete according to Mix4 Mix proportion in table 1, determining initial cohesive force between pervious concrete aggregate and slurry and a result after standing for 3h by adopting each step in a specific implementation mode, and determining slurry precipitation rate under the condition of rotating speed of 100r/min at two times.
TABLE 1 pervious concrete mix proportion
TABLE 2 evaluation of cohesion between aggregate and slurry of pervious concrete in each ratio and pre-mixing property
As can be seen from Table 2, the cohesive force and the slurry separation rate between the aggregate and the slurry of the pervious concrete obtained by the testing device of the invention are used for judging whether the pervious concrete with a certain mix proportion can be produced in a premixing mode and transported for a long distance.
Claims (11)
1. A quantitative test device for cohesive force between pervious concrete aggregate and slurry is characterized by comprising a material forming device, a speed-adjustable screening system, a vibration slurry-collecting weighing system and a control system;
the material forming device mainly refers to a screen drum;
the speed-adjustable screening system comprises an outer cylinder, a rotating motor with adjustable rotating speed, a transmission shaft, a belt wheel, a V-belt, a large working disc, a positioning rod, a base and a rear cover plate;
the screen drum is buckled above the large working disc; the positioning rod is fixed at the top of the large working disc; the screen drum is conveniently disassembled and assembled with the large working disc through the positioning rod; the base is positioned below the device, one side of the rotating motor is provided with a rear cover plate, and the other side of the rotating motor is provided with the vibration slurry collecting device; the rotating motor with the adjustable rotating speed is connected with a belt wheel through a V-belt, the belt wheel drives the large working disc to rotate through a transmission shaft, and the rotating motor with the adjustable rotating speed and the transmission shaft are fixed on the base;
the vibration slurry collecting and weighing system mainly comprises an outer cylinder, an electromagnetic vibrator, a discharging device, a small bucket and a weighing device; the outer cylinder surrounds the sieve barrel, and a gap is formed between the outer cylinder and the sieve barrel; the electromagnetic oscillation instrument is positioned on the outer side of the upper part of the outer barrel, the discharging device is positioned on the lower part of the inner side of the outer barrel, a large working disc is arranged above the discharging device, the discharging device is in a slope shape, the part of the bottom of the slope, which extends out of the outer barrel, is a discharging port, the discharged material of the discharging port falls into the small bucket, and the weighing device is used for weighing the discharged material;
the control system mainly refers to a control box;
the control box can start or stop the rotating motor and adjust the rotating speed of the rotating motor, and the control box can also start or stop the electromagnetic oscillator.
2. The quantitative test device for the cohesive force between the pervious concrete aggregate and the slurry as claimed in claim 1, wherein the screen cylinder is a cylindrical uncovered stainless steel cylinder with an inner diameter of 200mm and a wall thickness of 2 mm.
3. The quantitative test device for the cohesive force between the pervious concrete aggregate and the slurry as claimed in claim 1, wherein the side wall of the screen cylinder is provided with circular holes with the diameter of 2mm, the circular holes are distributed in a close packing manner, and the distance between the two holes is 1 mm.
4. The quantitative test device for the cohesion force between pervious concrete aggregate and slurry according to claim 1, wherein the bottom of the screen cylinder is provided with four fixing holes, the diameter of each fixing hole is 10mm, the center of the screen cylinder is provided with one screen cylinder, and the other three screen cylinders are uniformly distributed on a concentric circle of 150 mm.
5. The quantitative testing device for the cohesive force between the pervious concrete aggregate and the slurry as claimed in claim 4, wherein four positioning rods are mounted on the large working disc, one is arranged at the center, and three positioning rods are uniformly distributed on a concentric circle of 150 mm; the diameter is 10mm and the height is 10 mm.
6. The quantitative testing device for the cohesive force between the pervious concrete aggregate and the slurry according to claim 5, wherein three positioning rods on the outer ring of the large working disc are close to the surface of the large working disc, and clamping grooves with the width of 5mm and the thickness of 2mm are formed in the clockwise direction.
7. The quantitative test device for the cohesive force between the pervious concrete aggregate and the slurry as claimed in claim 1, wherein the large working disc is mounted on the transmission shaft, and the diameter of the large working disc is consistent with the inner diameter of the screen cylinder.
8. The method for testing the quantitative test device of cohesion between pervious concrete aggregate and slurry as claimed in any one of claims 1 to 7, characterized by comprising the following operating steps:
(1) wet hair is used for wiping the screen cylinder, the working large disc, the outer cylinder and the discharge hole, but no obvious water drop is ensured inside;
(2) placing the screen drum on the large working disc, twisting the screen drum anticlockwise, and clamping the screen drum into the positioning rod at the upper part of the large working disc;
(3) weighing 2kg of freshly-mixed pervious concrete, placing the freshly-mixed pervious concrete into a screen drum, and uniformly distributing the mixture in the screen drum as much as possible in order to avoid excessive vibration of a machine during rotation; calculating the total amount m of the slurry according to the mixing proportion of the concretep1；
(4) The rotating motor is started by the control box to gradually and slowly increase the rotating speed, and when slurry begins to be thrown out of the side wall of the screen drum, the rotating speed at the moment is recorded as omega1(ii) a Continuously increasing the rotating speed to omega2Maintaining for 2min at 100r/min, and then gradually reducing the rotating speed and turning off the rotating motor;
(5) the electromagnetic oscillation instrument is started through the control box, the electromagnetic oscillation instrument is maintained for 1-2 min until all the slurry in the outer barrel flows out of the discharge port, the slurry is collected by the small barrels, and the weighing device is used for weighing mp2；
(6) Twisting the screen drum clockwise, taking out the screen drum from the fixed position of the positioning rod, and cleaning the screen drum, the working large disc, the outer drum, the discharge hole and the like;
(7) calculating the cohesive force between the pervious concrete aggregate and the slurry precipitation rate;
the calculation formula of the cohesive force between the pervious concrete aggregate and the slurry is Fcf＝mp1×ω1 2×r；
The calculation formula of the slurry precipitation rate is PS＝mp2/mp1×100％。
9. The application of the quantitative test method for cohesion between pervious concrete aggregate and slurry as claimed in claim 8 is characterized in that the quantitative test method is used for judging whether pervious concrete can be produced by a premixing mode.
10. The application of the method as claimed in claim 9, wherein the initial cohesive force between the aggregate and the slurry of the pervious concrete produced by the premixing mode is 20-100N, and the cohesive force within 3h should not be increased to 150N.
11. The application of the concrete as claimed in claim 9, wherein the slurry precipitation rate of the pervious concrete produced by the premixing mode is 20-40%; when the slurry precipitation rate is 0-20%, the pervious concrete is too poor in workability and cannot be loaded or unloaded; when the slurry precipitation rate is 40-100%, slurry sinking and aggregate segregation are easy to occur in the pervious concrete in the transportation engineering.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933202A (en) * | 2021-10-12 | 2022-01-14 | 福州大学 | Pervious concrete work performance testing device and method based on mixture cohesiveness |
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|---|---|---|---|---|
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