CN114199723B - Rheological property testing device under vibration action of fresh concrete and application method thereof - Google Patents
Rheological property testing device under vibration action of fresh concrete and application method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 76
- 238000012360 testing method Methods 0.000 title claims abstract description 50
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000009987 spinning Methods 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 12
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000008188 pellet Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 108050006002 RNA polymerase sigma factor FliA Proteins 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing 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
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
A rheological property testing device under the vibration action of fresh concrete and a use method thereof. The invention relates to the field of testing of the overall stability and uniformity of fresh concrete. The method aims to solve the problem that the rheological parameters of the fresh concrete at different positions away from the vibration source can not be accurately measured under the vibration effect in the existing fresh concrete rheological property testing method. The device consists of a frame, a driving unit, a testing unit and a communication unit; the driving unit consists of a motor, a lifting table, a coupler, a spinning machine, an optical axis, a bearing support and a control box; the test unit consists of a screw, a high-precision tension sensor, a pulley assembly, a fine wire, a small ball, a container, an inserted vibrating rod and a movable base; the method comprises the following steps: and drawing a shear stress-shear rate curve according to force values measured by the high-precision tension sensor at different rotating speeds, and fitting to obtain rheological parameters corresponding to the needed rheological model. The invention is used for rheological property test under the vibration action of fresh concrete.
Description
Technical Field
The invention relates to the field of testing of the overall stability and uniformity of fresh concrete, in particular to a rheological property testing device under the vibration action of fresh concrete and a using method thereof.
Background
Concrete is the most widely used artificial composite material in civil engineering. With the continuous development of modern science, technology and economy, various building forms are continuously emerging, and the performance requirements of high-rise and large-span structures on concrete materials are gradually improved. In practical engineering, when a freshly mixed concrete pouring member is used, an inserted vibrating rod is generally required to vibrate and discharge bubbles so as to enable concrete materials to be densely filled in a mold. Under the vibration action of the freshly mixed concrete, the slurry in the vibration radius can show different rheological properties with the peripheral slurry. Because the slurry in the vibrating radius is subjected to high-speed shearing action generated by vibration and is relatively close to a vibration source, the yield stress and the plastic viscosity of the slurry are greatly reduced, and the phenomenon of liquefaction occurs. The vibrating action is helpful for removing bubbles, so that the concrete is uniformly compacted, and the mechanical property and durability of the hardened concrete are improved. However, when the vibrating rod vibrates at a certain position of the concrete for too long or too close to the vibrating position, the concrete is extremely easy to separate. Segregation of concrete is caused by insufficient cohesion between the concrete components, and is generally represented by the separation of the coarse aggregate and mortar components from each other. Coarse aggregate with larger particle size sinks under the action of self weight and vibration, so that the concrete quality at different heights is different. The segregation caused by over vibration can greatly reduce the strength of the concrete, seriously affect the bearing capacity of the concrete structure and reduce the safety performance and durability of the structure. Therefore, the method has extremely important significance in determining the rheological property of fresh concrete under the vibration action. At present, the method for testing and evaluating the rheological property of fresh concrete under the vibration condition at home and abroad is very limited. Such as: and measuring rheological property of the vibrated fresh concrete by adopting a vibration rheometer. The method can only test the rheological property of the freshly mixed concrete after the whole vibration, can not test the rheological property change of the freshly mixed concrete at different positions away from the vibration source, and is difficult to reflect the actual engineering condition.
Disclosure of Invention
The invention provides a rheological property testing device under the vibration action of fresh concrete and a use method thereof, and aims to solve the problem that the rheological property testing method of the existing fresh concrete can not accurately test rheological parameters of the fresh concrete at different positions away from a vibration source under the vibration action.
The invention relates to a rheological property testing device under the vibration action of fresh concrete, which consists of a frame, a driving unit, a testing unit and a communication unit; the frame is a cube fixed support, the upper part of the frame is provided with a top edge special support, and the lower part of the frame is provided with a bottom edge special support; the driving unit consists of a motor, a lifting platform, a shaft coupling, a rotator, an optical axis, a bearing support and a control box, wherein the lifting platform is arranged at the outer side of the frame, the motor is fixed on the lifting platform, two ends of the optical axis are respectively supported by the bearing support, and the optical axis is connected with the motor through the shaft coupling and is kept horizontal; the optical axis is provided with a plurality of gyros at equal intervals, and the bearing support is arranged on the special support at the bottom edge; the control box is connected with the motor through a wire and used for controlling the motor; the test unit consists of a screw, a high-precision tension sensor, a pulley assembly, a fine wire, a small ball, a container, an inserted vibrating rod and a movable base; corresponding pulley assemblies are arranged above the plurality of gyros which are equidistantly arranged, the pulley assemblies are respectively fixed on the special support at the top edge through screws, high-precision tension sensors are arranged on the screws, and the thin wires penetrate through one ends of the pulley assemblies and are fixed on the gyros, and the other ends of the thin wires are connected with the small balls; the container is a hollow container with an opening at the upper end, the container is placed on the movable base, and the inserted vibrating rod is vertically arranged at one end of the container; the communication unit consists of a data transmission line, a multi-channel communication module, a USB-485 converter and a USB plug; the multi-channel communication module is connected with the high-precision tension sensor through a data transmission line, the multi-channel communication module is connected with the USB-485 converter through a lead, and a USB plug is arranged on the USB-485 converter.
The invention relates to a using method of a rheological property testing device under the vibration action of fresh concrete, which comprises the following steps:
1. the USB plug is connected to a computer, the ball is static in the air at the beginning, and the force value of the high-precision tension sensor is cleared;
2. pulling out the movable base to uniformly fill the container with the fresh concrete sample to be tested;
3. pushing the movable base, lifting the small ball to fall into the fresh concrete sample, adjusting the position of the movable base to ensure that the small ball is always positioned on the central axis of the container, and braking the movable base to ensure that the position of the movable base is kept unchanged;
4. switching on 220V alternating current power supply, pressing a power switch of a control box, setting a plurality of speed gears of the speed changer, and adjusting the speed changer to the initially set speed gears;
5. pressing an ascending button of the control box, driving the rotator to rotate by the motor through an optical axis, and pulling out the pellets from the fresh concrete sample at a constant speed through fine line transmission;
6. immediately pressing a pause button of the control box after the small ball is pulled out of the upper surface of the fresh concrete sample, and keeping the force value change of the high-precision tension sensor in the pulling process by a computer;
7. pressing a descending button of the control box to enable the small ball to descend to an initial position and to be always positioned on the central axis of the container;
8. adjusting the transmission of the control box to the next set rotating speed gear, and resetting the force value of the high-precision tension sensor;
9. repeating the steps 5 to 8 until all the set rotational speed gear tests are completed;
10. and drawing a shear stress-shear rate curve according to force values measured by the high-precision tension sensor at different rotating speeds, and fitting to obtain rheological parameters corresponding to the needed rheological model.
The invention has the advantages that:
by adopting the device provided by the invention, the rheological properties of the fresh concrete with different mixing ratios at different positions away from the vibration source can be conveniently and accurately measured. The vibrating time, the vibrating frequency and the like of the inserted vibrating rod can be set at will in the test process, the newly mixed concrete area tested by the small balls can be adjusted at will, and the motor rotating speed can be adjusted according to the fitting requirement of rheological parameters, so that the device can be used for experimental study and actual engineering test. The testing device is simple in working principle, convenient to operate, high in testing precision and wide in application range.
Drawings
FIG. 1 is a schematic structural diagram of a rheological property testing device under the vibration action of fresh concrete;
FIG. 2 is a side view of the interior of the container;
FIG. 3 is a comparative graph of the results of the vibration test in the examples; wherein, the section A is stationary in the mortar stage, the section B is an acceleration stage, the section C is a constant speed stage, the section D is a stage passing through a gas-liquid interface, and the section E is stationary in the air; the ball distance plug-in type vibrating rod is 100mm 1, the ball distance plug-in type vibrating rod is 100mm 2, the ball distance plug-in type vibrating rod is 100mm 3, and the ball distance plug-in type vibrating rod is 100mm 4;
FIG. 4 is a graph showing the relationship between shear stress and shear rate in the vibration test in the examples; wherein 1 is 100mm of the small ball distance plug-in type vibrating rod, 2 is 100mm of the small ball distance plug-in type vibrating rod, 3 is 100mm of the small ball distance plug-in type vibrating rod, and 4 is 100mm of the small ball distance plug-in type vibrating rod.
Detailed Description
The first embodiment is as follows: referring to fig. 1 and 2, a rheological property testing device under the vibration action of fresh concrete in the present embodiment is described as a device comprising a frame 1, a driving unit, a testing unit and a communication unit; the frame 1 is a cube fixed bracket, a top edge special bracket is arranged at the upper part of the frame 1, and a bottom edge special bracket is arranged at the lower part of the frame 1; the driving unit consists of a motor 17, a lifting table 18, a coupler 20, a rotator 7, an optical axis 8, a bearing support 9 and a control box 15, wherein the lifting table 18 is arranged on the outer side of the frame 1, the motor 17 is fixed on the lifting table 18, two ends of the optical axis 8 are respectively supported by the bearing support 9, and the optical axis 8 is connected with the motor 17 through the coupler 20 and is kept horizontal; a plurality of gyros 7 are equidistantly arranged on the optical axis 8, and the bearing support 9 is arranged on the bottom special bracket; the control box 15 is connected with the motor 17 through a wire and is used for controlling the motor 17; the test unit consists of a screw rod 2, a high-precision tension sensor 3, a pulley assembly 4, a thin wire 5, a small ball 21, a container 6, an inserted vibrating rod 19 and a movable base 10; corresponding pulley assemblies 4 are arranged above the plurality of gyros 7 which are equidistantly arranged, the pulley assemblies 4 are respectively fixed on the special support at the top edge through screw rods 2, high-precision tension sensors 3 are arranged on the screw rods 2, and thin wires 5 penetrate through one ends of the pulley assemblies 4 to be fixed on the gyros 7, and the other ends are connected with small balls 21; the container 6 is a hollow container with an opening at the upper end, the container 6 is placed on the movable base 10, and the inserted vibrating rod 19 is vertically arranged at one end of the container 6; the communication unit consists of a data transmission line 11, a multi-channel communication module 12, a USB-485 converter 13 and a USB plug 14; the multichannel communication module 12 is connected with the high-precision tension sensor 3 through a data transmission line 11, the multichannel communication module 12 is connected with the USB-485 converter 13 through a wire, and the USB-485 converter 13 is provided with a USB plug 14.
The second embodiment is as follows: the first difference between this embodiment and the specific embodiment is that: the control box 15 comprises an intelligent digital display speed regulator and a button switch. The other is the same as in the first embodiment.
The control box is connected with the motor through a wire and used for controlling the motor to switch, adjust the rotating speed, pause, forward rotation, reverse rotation and the like.
And a third specific embodiment: this embodiment differs from the first or second embodiment in that: the control box 15 is externally connected with a 220V alternating current power supply 16. The other is the same as the first or second embodiment.
The specific embodiment IV is as follows: the application method of the rheological property testing device under the vibration action of the fresh concrete in the embodiment is carried out according to the following steps:
1. the USB plug 14 is connected to a computer, the ball 21 is static in the air at the beginning, and the force value of the high-precision tension sensor 3 is cleared;
2. pulling out the movable base 10 to uniformly fill the container 6 with the fresh concrete sample to be tested;
3. pushing in the movable base 10, lifting the small ball 21 to fall into the fresh concrete sample, adjusting the position of the movable base 10 to ensure that the small ball is always positioned on the central axis of the container 6, and braking the movable base 10 to ensure that the position of the movable base is kept unchanged;
4. switching on 220V alternating current power supply 16, pressing a power switch of control box 15, setting a plurality of speed gears of the speed changer, and adjusting the speed changer to the initial set speed gears;
5. pressing an ascending button of the control box 15, driving the rotator 7 to rotate by the motor 17 through the optical axis 8, and pulling out the small balls 21 from the fresh concrete sample at a constant speed through the transmission of the thin wire 5;
6. immediately pressing a pause button of the control box 15 after the small ball 21 pulls out the upper surface of the fresh concrete sample, and keeping the force value change of the high-precision tension sensor 3 in the pulling process by a computer;
7. pressing the lowering button of the control box 15 to lower the ball 21 to the initial position and to keep it on the central axis of the container 6;
8. the transmission of the control box 15 is regulated to the next set rotating speed gear, and the force value of the high-precision tension sensor 3 is cleared;
9. repeating the steps 5 to 8 until all the set rotational speed gear tests are completed;
10. and drawing a shear stress-shear rate curve according to force values measured by the high-precision tension sensor 3 at different rotating speeds, and fitting to obtain rheological parameters corresponding to the needed rheological model.
Fifth embodiment: the fourth difference between this embodiment and the third embodiment is that: the fresh concrete sample to be tested in the first step is fresh concrete mortar with the water-cement ratio of 0.4, the cement-sand ratio of 1:2 and the mixing amount of the polycarboxylic acid high-efficiency water reducer of 0.8%. The other is the same as in the fourth embodiment.
Specific embodiment six: the present embodiment differs from the fourth or fifth embodiment in that: the radius of the small ball 21 in the second step is 20mm, and the gravity acceleration g is 9.81m/s 2 . The others are the same as those of the fourth or fifth embodiment.
Seventh embodiment: the present embodiment differs from one of the fourth to sixth embodiments in that: the transmission speed gear settings in step four are 1240RPM, 1140RPM, 1000RPM, 728RPM, and 510RPM, respectively. The others are the same as those of the fourth to sixth embodiments.
Eighth embodiment: the present embodiment differs from one of the fourth to seventh embodiments in that: and step four, the rotating speed gear which is initially set is 1240RPM. The others are the same as in one of the fourth to seventh embodiments.
Detailed description nine: the present embodiment differs from one of the fourth to eighth embodiments in that: in the fifth step, the diameter of the optical axis 8 is 100mm. The others are the same as in one of the fourth to eighth embodiments.
Detailed description ten: this embodiment differs from one of the fourth to ninth embodiments in that: in the sixth step, the ball 21 is pulled out to a position lower than the lower end of the pulley assembly 4. The others are the same as in one of the fourth to ninth embodiments.
The beneficial effects of the invention are verified by the following examples:
the application method of the rheological property testing device under the vibration action of the fresh concrete comprises the following steps:
the USB plug 14 is connected to a computer, the ball 21 is static in the air at the beginning, and the force value of the high-precision tension sensor 3 is cleared;
pulling out the movable base 10 to uniformly fill the container 6 with the fresh concrete sample to be tested; the fresh concrete sample to be tested is mortar with the water-cement ratio of 0.4, the cement-sand ratio of 1:2 and the mixing amount of the polycarboxylic acid high-efficiency water reducer of 0.8 percent; the temperature of the mortar is 24.1 ℃ during testing;
pushing in the movable base 10, lifting the small ball 21 to fall into the fresh concrete sample, adjusting the position of the movable base 10 to ensure that the small ball is always positioned on the central axis of the container 6, and braking the movable base 10 to ensure that the position of the movable base is kept unchanged; the radius of the small ball 21 is 20mm, and the gravity acceleration g is 9.81m/s 2 ；
The 220V AC power supply 16 is turned on, the power switch of the control box 15 is pressed, and the speed gear settings of the transmission are 1240RPM, 1140RPM, 1000RPM, 728RPM and 510RPM, respectively. The transmission is adjusted to an initially set rotational speed gear 1240RPM. The ascending button of the control box 15 is pressed, and the motor 17 pulls the small balls 21 out of the fresh concrete at a constant speed through the coupler 20, the optical axis 8, the rotator 7, the thin wire 5, the pulley 4 and the like. Immediately after the balls 21 are pulled out of the upper surface of the freshly mixed concrete, the pause button of the control box 15 is pressed, and the computer keeps the force value of the pulling-out process sensor 3 changed without making the height of the balls 21 exceed the lower end of the pulley 4. The lowering button of the control box 15 is pressed to lower the ball 21 to the initial position and to keep it on the central axis of the container 6. The transmission of the control box 15 was adjusted sequentially to 1140RPM, 1000RPM, 728RPM and 510RPM, each speed measuring force values in the same manner as described above.
And after all the rotating speed tests are completed, data processing is carried out. When the motor 17 rotates at 728RPM, the actual speed of deceleration via the reduction gearbox is 79.3RPM, the diameter of the optical axis 8 is 100mm, and the actual pull-out speed v of the pellet 21 is 0.0415m/s. The radius R of the pellets is 20mm. Gravitational acceleration g of 9.81m/s 2 . The temperature of the freshly mixed concrete to be tested in the test is 24.1 ℃. As shown in fig. 3, the positive sign of the force in the figure indicates the compressive force and the negative sign indicates the tensile force. Time 0 indicates the instant at which the pellet starts to pull. Pellet pull out can be divided into 5 stages: the section A is static in the mortar stage; the section B is an acceleration stage; the section C is a constant speed stage; the section D is a gas-liquid interface passing stage; section E is a stationary stage in air. Wherein the constant speed stage is a stage in which the pellets are pulled out of the slurry at a constant speed in a force balance state, so that the difference between the average value of the force values of the stage (1) and the average value of the force values of the stage (3) is equal to the pulling force F according to the analysis of the pulley block and the force of the pellets drag Is 2 times as large as the above.
Calculating the pulling force F of all the pellets at different speeds drag . Shear stress sigma-F drag /R 2 The shear rate v.alpha.v/R, therefore F drag /R 2 As a measure of shear stress, v/R was used as a measure of shear rate, and the two were plotted as shown in fig. 4. And fitting small ball curves with different distances, wherein the fitting is performed according to the selected rheological constitutive model. If the linear fitting is performed by using a Bingham model, the nonlinear fitting is performed by using a Helschel-Bakeley model or a power law model. For example, a linear fit is performed using a bingham model, whose constitutive equation is as follows:
τ＝τ 0 +μγ'，τ≥τ 0 ； ①
γ'＝0，τ＜τ 0 ； ②；
where τ -shear stress (Pa); τ 0 -yield shear stress (Pa); mu-plastic viscosity (Pa.s); gamma' — shear rate(s) -1 )。
Therefore, the intercept of the fitting straight line and the vertical axis is the measurement of the yield shear stress, and the slope is the measurement of the plastic viscosity. As can be seen from fig. 2, the vibration causes a decrease in the yield shear stress and plastic viscosity of the fresh concrete. The closer the vibration source is along the radial direction, the larger the reduction degree is, and the more obvious the vibration effect is. If the freshly mixed concrete at the positions 100mm and 200mm away from the vibration source in the example can judge the 'liquefaction region' within the range of the vibration action radius, the yield shear stress is reduced to be almost 0, and the plastic viscosity is reduced; fresh concrete at the positions 300mm and 400mm away from the vibration source can be judged to be outside the range of the vibration action radius, the influence of vibration is relatively small, and the yield shear stress and the plastic viscosity are still reduced.
Claims (10)
1. The rheological property testing device under the vibration action of the fresh concrete is characterized by comprising a frame (1), a driving unit, a testing unit and a communication unit; the frame (1) is a cube fixed bracket, a top edge special bracket is arranged at the upper part of the frame (1), and a bottom edge special bracket is arranged at the lower part of the frame (1); the driving unit consists of a motor (17), a lifting table (18), a coupler (20), a spinning machine (7), an optical axis (8), a bearing support (9) and a control box (15), wherein the lifting table (18) is arranged on the outer side of the frame (1), the motor (17) is fixed on the lifting table (18), two ends of the optical axis (8) are respectively supported by the bearing support (9), and the optical axis (8) is connected with the motor (17) through the coupler (20) and is kept horizontal; a plurality of gyros (7) are equidistantly arranged on the optical axis (8), and the bearing support (9) is arranged on the special support at the bottom edge; the control box (15) is connected with the motor (17) through a wire and is used for controlling the motor (17); the testing unit consists of a screw (2), a high-precision tension sensor (3), a pulley assembly (4), a thin wire (5), a small ball (21), a container (6), an inserted vibrating rod (19) and a movable base (10); corresponding pulley assemblies (4) are arranged above the plurality of gyros (7) which are equidistantly arranged, the pulley assemblies (4) are respectively fixed on the special support at the top edge through screws (2), high-precision tension sensors (3) are arranged on the screws (2), and thin wires (5) penetrate through one ends of the pulley assemblies (4) to be fixed on the gyros (7), and the other ends of the thin wires are connected with small balls (21); the container (6) is a hollow container with an opening at the upper end, the container (6) is placed on the movable base (10), and the inserted vibrating rod (19) is vertically arranged at one end of the container (6); the communication unit consists of a data transmission line (11), a multi-channel communication module (12), a USB-485 converter (13) and a USB plug (14); the multi-channel communication module (12) is connected with the high-precision tension sensor (3) through a data transmission line (11), the multi-channel communication module (12) is connected with the USB-485 converter (13) through a wire, and the USB-485 converter (13) is provided with a USB plug (14); the container (6) is filled with a fresh concrete sample to be tested, and the balls (21) can fall into the fresh concrete sample in the container (6), and the distances between the gyros (7) and the inserted vibrating rod (19) are unequal.
2. The rheological property testing device under the vibrating action of the fresh concrete according to claim 1, wherein the control box (15) comprises an intelligent digital display speed regulator and a button switch.
3. The rheological property testing device under the vibrating action of the fresh concrete according to claim 1, wherein the control box (15) is externally connected with a 220V alternating current power supply (16).
4. The method for using the rheological property testing device under the vibration action of the fresh concrete according to claim 1, wherein the method for using the rheological property testing device under the vibration action of the fresh concrete is carried out according to the following steps:
1. the USB plug (14) is connected into a computer, a small ball (21) is static in the air at the beginning, and the force value of the high-precision tension sensor (3) is cleared;
2. pulling out the movable base (10) to uniformly fill the container (6) with the fresh concrete sample to be tested;
3. pushing in the movable base (10), lifting the small balls (21) to fall into the fresh concrete sample, adjusting the position of the movable base (10) to ensure that the small balls are always positioned on the central axis of the container (6), and braking the movable base (10) to ensure that the position of the movable base is kept unchanged;
4. switching on a 220V alternating current power supply (16), pressing a power switch of a control box (15), setting a plurality of speed gears of the speed changer, and adjusting the speed changer to the initially set speed gears;
5. pressing an ascending button of a control box (15), driving a rotator (7) to rotate by a motor (17) through an optical axis (8), and pulling out a small ball (21) from a fresh concrete sample at a constant speed through transmission of a fine wire (5);
6. immediately pressing a pause button of the control box (15) after the small ball (21) pulls out the upper surface of the fresh concrete sample, and storing the force value change of the high-precision tension sensor (3) in the pulling-out process by a computer;
7. pressing down a down button of the control box (15) to enable the small ball (21) to descend to an initial position and to be always positioned on the central axis of the container (6);
8. adjusting the transmission of the control box (15) to the next set rotating speed gear, and clearing the force value of the high-precision tension sensor (3);
9. repeating the fifth step to the eighth step until all the set rotational speed gear tests are completed;
10. and drawing a shear stress-shear rate curve according to force values measured by the high-precision tension sensor (3) at different rotating speeds, and fitting to obtain rheological parameters corresponding to the needed rheological model.
5. The method for using a device for testing rheological properties under the vibration action of fresh concrete according to claim 4, wherein the fresh concrete sample to be tested in the step one is fresh concrete mortar with a water-cement ratio of 0.4, a cement-sand ratio of 1:2 and a polycarboxylic acid high-efficiency water reducer mixing amount of 0.8%.
6. The method for using a device for testing rheological properties under the vibrating action of fresh concrete according to claim 4, wherein the method comprises the following steps ofThe radius of the small ball (21) is 20mm, and the gravity acceleration g is 9.81m/s 2 。
7. The method of using a device for testing rheological properties under a vibrating action of fresh concrete according to claim 4, wherein the rotational speed and gear settings of the transmission in the fourth step are 1240RPM, 1140RPM, 1000RPM, 728RPM and 510RPM, respectively.
8. The method of using a device for testing rheological properties under vibrating action of fresh concrete according to claim 7, wherein the rotation speed gear is 1240RPM.
9. The method according to claim 4, wherein the diameter of the optical axis (8) in the fifth step is 100mm.
10. The method of using a device for testing rheological properties under the vibrating action of fresh concrete according to claim 4, wherein the balls (21) are pulled out to a position lower than the lower end of the pulley assembly (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111572902.9A CN114199723B (en) | 2021-12-21 | 2021-12-21 | Rheological property testing device under vibration action of fresh concrete and application method thereof |
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